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NDQ_016199 | gases used in halogen lights include | a. neon, b. argon, c. mercury, d. two of the above | d | Lesson: artificial light
Turn on the Lights:
If youre like most people, you dont give it a thought when you flick a switch to turn on a lightat least not until the power goes out and youre left in the dark! When you flick on a light switch, electricity normally flows through the light, and some type of light bulb conv... |
NDQ_016200 | a vapor light produces light by fluorescence. | a. true, b. false | b | Lesson: artificial light
Turn on the Lights:
If youre like most people, you dont give it a thought when you flick a switch to turn on a lightat least not until the power goes out and youre left in the dark! When you flick on a light switch, electricity normally flows through the light, and some type of light bulb conv... |
NDQ_016202 | forces that hold together particles within the atom include | a. gravity, b. electromagnetic force, c. weak nuclear force, d. two of the above | d | Lesson: atomic forces
Electromagnetic Force:
Electromagnetic force is a force of attraction or repulsion between all electrically charged particles. This force is transferred between charged particles of matter by fundamental force-carrying particles called photons. Because of electromagnetic force, particles with opp... |
NDQ_016205 | the strong nuclear force is a force of attraction between quarks. | a. true, b. false | a | Lesson: atomic forces
Electromagnetic Force:
Electromagnetic force is a force of attraction or repulsion between all electrically charged particles. This force is transferred between charged particles of matter by fundamental force-carrying particles called photons. Because of electromagnetic force, particles with opp... |
NDQ_016206 | which statement about the strong nuclear force is false? | a. it can overcome the electromagnetic force pushing protons apart, b. it works over very long distances, c. it is transferred by gluons, d. two of the above | b | Lesson: atomic forces
Electromagnetic Force:
Electromagnetic force is a force of attraction or repulsion between all electrically charged particles. This force is transferred between charged particles of matter by fundamental force-carrying particles called photons. Because of electromagnetic force, particles with opp... |
NDQ_016207 | the weak nuclear force is transferred by w and z bosons. | a. true, b. false | a | Lesson: atomic forces
Electromagnetic Force:
Electromagnetic force is a force of attraction or repulsion between all electrically charged particles. This force is transferred between charged particles of matter by fundamental force-carrying particles called photons. Because of electromagnetic force, particles with opp... |
NDQ_016209 | up quarks can change to down quarks. | a. true, b. false | a | Lesson: atomic forces
Electromagnetic Force:
Electromagnetic force is a force of attraction or repulsion between all electrically charged particles. This force is transferred between charged particles of matter by fundamental force-carrying particles called photons. Because of electromagnetic force, particles with opp... |
NDQ_016213 | the nucleus contains | a. protons, b. neutrons, c. electrons, d. two of the above | d | Lesson: atomic nucleus
At the Heart of It All:
The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric ch... |
NDQ_016214 | outside of the nucleus, an atom is mostly empty space. | a. true, b. false | a | Lesson: atomic nucleus
At the Heart of It All:
The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric ch... |
NDQ_016215 | the nucleus makes up about 1/100th of the total radius of an atom. | a. true, b. false | b | Lesson: atomic nucleus
At the Heart of It All:
The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric ch... |
NDQ_016216 | the nucleus has almost all of the mass of an atom. | a. true, b. false | a | Lesson: atomic nucleus
At the Heart of It All:
The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric ch... |
NDQ_016217 | what force holds together the nucleus? | a. the force of attraction between positive and negative particles, b. the force of attraction between the nucleus and electrons, c. the strong nuclear force between protons and neutrons, d. the weak atomic force between neutrons and electrons | c | Lesson: atomic nucleus
At the Heart of It All:
The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric ch... |
NDQ_016219 | there is an electric force of repulsion between neutrons and protons. | a. true, b. false | b | Lesson: atomic nucleus
At the Heart of It All:
The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric ch... |
NDQ_016224 | all atoms of a given element have the same number of protons. | a. true, b. false | a | Lesson: atomic number
Telling Atoms Apart:
Its often useful to have ways to signify different people or objects like athletes on teams. The same is true of atoms. Its important to be able to distinguish atoms of one element from atoms of other elements. Elements are pure substances that make up all other matter, so ea... |
NDQ_016225 | atoms of different elements always have different numbers of protons. | a. true, b. false | a | Lesson: atomic number
Telling Atoms Apart:
Its often useful to have ways to signify different people or objects like athletes on teams. The same is true of atoms. Its important to be able to distinguish atoms of one element from atoms of other elements. Elements are pure substances that make up all other matter, so ea... |
NDQ_016228 | which statement about the mass of subatomic particles is false? | a. a proton has a mass of 1 amu, b. a neutron has slightly more mass than a proton, c. an electron has slightly less mass than a proton, d. none of the above | c | Lesson: atomic number
Telling Atoms Apart:
Its often useful to have ways to signify different people or objects like athletes on teams. The same is true of atoms. Its important to be able to distinguish atoms of one element from atoms of other elements. Elements are pure substances that make up all other matter, so ea... |
NDQ_016229 | a carbon atom has six protons and six neutrons. what is its atomic number? | a. 6, b. 12, c. 36, d. none of the above | a | Lesson: atomic number
Telling Atoms Apart:
Its often useful to have ways to signify different people or objects like athletes on teams. The same is true of atoms. Its important to be able to distinguish atoms of one element from atoms of other elements. Elements are pure substances that make up all other matter, so ea... |
NDQ_016230 | what is the mass number of the carbon atom in question 8? | a. 6, b. 12, c. 18, d. 72 | b | Lesson: atomic number
Telling Atoms Apart:
Its often useful to have ways to signify different people or objects like athletes on teams. The same is true of atoms. Its important to be able to distinguish atoms of one element from atoms of other elements. Elements are pure substances that make up all other matter, so ea... |
NDQ_016243 | which of the following is the general form of a chemical equation? | a. reactants = products, b. products + reactants = 100%, c. products reactants, d. reactants products | d | Lesson: balancing chemical equations
Writing Chemical Equations:
A chemical equation represents the changes that occur during a chemical reaction. A chemical equation has the general form: Reactants Products An example of a simple chemical reaction is the reaction in which hydrogen (H2 ) and oxygen (O2 ) combine to p... |
NDQ_016245 | which of the following equations is balanced? | a. h2 + o2 h2o, b. 2h2 + o2 2h2o, c. h2 + 2o2 2h2o, d. 2h2 + o2 h2o | b | Lesson: balancing chemical equations
Writing Chemical Equations:
A chemical equation represents the changes that occur during a chemical reaction. A chemical equation has the general form: Reactants Products An example of a simple chemical reaction is the reaction in which hydrogen (H2 ) and oxygen (O2 ) combine to p... |
NDQ_016246 | numbers called subscripts are used to balance chemical equations. | a. true, b. false | b | Lesson: balancing chemical equations
Writing Chemical Equations:
A chemical equation represents the changes that occur during a chemical reaction. A chemical equation has the general form: Reactants Products An example of a simple chemical reaction is the reaction in which hydrogen (H2 ) and oxygen (O2 ) combine to p... |
NDQ_016248 | which of the following rules should you follow to balance chemical equations? | a. change only the subscripts, b. use the smallest possible subscripts, c. add coefficients as needed, d. two of the above | c | Lesson: balancing chemical equations
Writing Chemical Equations:
A chemical equation represents the changes that occur during a chemical reaction. A chemical equation has the general form: Reactants Products An example of a simple chemical reaction is the reaction in which hydrogen (H2 ) and oxygen (O2 ) combine to p... |
NDQ_016250 | which coefficient will balance the following equation? zn + hcl zncl2 + h2 | a. 2, b. 3, c. 4, d. none of the above | a | Lesson: balancing chemical equations
Writing Chemical Equations:
A chemical equation represents the changes that occur during a chemical reaction. A chemical equation has the general form: Reactants Products An example of a simple chemical reaction is the reaction in which hydrogen (H2 ) and oxygen (O2 ) combine to p... |
NDQ_016265 | which particle is emitted from a nucleus when it undergoes beta-minus decay? | a. electron, b. positron, c. anti-electron, d. proton | a | Lesson: beta decay
Which Nuclei Decay:
Atoms with unstable nuclei are radioactive. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei emit energy and usually particles of matter as well. There are several types of radioactive decay, including alpha, beta, and gamma decay. Ene... |
NDQ_016266 | beta-positive decay begins with a proton. | a. true, b. false | a | Lesson: beta decay
Which Nuclei Decay:
Atoms with unstable nuclei are radioactive. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei emit energy and usually particles of matter as well. There are several types of radioactive decay, including alpha, beta, and gamma decay. Ene... |
NDQ_016267 | in the following symbol for a beta-minus particle, what does the superscript represent? | a. charge, b. mass, c. energy, d. none of the above | b | Lesson: beta decay
Which Nuclei Decay:
Atoms with unstable nuclei are radioactive. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei emit energy and usually particles of matter as well. There are several types of radioactive decay, including alpha, beta, and gamma decay. Ene... |
NDQ_016270 | beta particles can travel only a few centimeters through the air. | a. true, b. false | b | Lesson: beta decay
Which Nuclei Decay:
Atoms with unstable nuclei are radioactive. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei emit energy and usually particles of matter as well. There are several types of radioactive decay, including alpha, beta, and gamma decay. Ene... |
NDQ_016271 | beta-positive decay results in a nucleus with one less proton. | a. true, b. false | a | Lesson: beta decay
Which Nuclei Decay:
Atoms with unstable nuclei are radioactive. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei emit energy and usually particles of matter as well. There are several types of radioactive decay, including alpha, beta, and gamma decay. Ene... |
NDQ_016273 | there are only about 100 different biochemical compounds. | a. true, b. false | b | Lesson: biochemical compound classification
Introduction to Biochemical Compounds:
Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means life. A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and ... |
NDQ_016275 | the similarity in biochemical compounds between living things provides some of the best evidence for evolution. | a. true, b. false | a | Lesson: biochemical compound classification
Introduction to Biochemical Compounds:
Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means life. A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and ... |
NDQ_016277 | functions of carbohydrates include | a. storing energy in plants, b. storing energy in animals, c. making up cell walls in plants, d. two of the above | d | Lesson: biochemical compound classification
Introduction to Biochemical Compounds:
Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means life. A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and ... |
NDQ_016278 | functions of nucleic acids include | a. storing genetic information in cells, b. speeding up biochemical reactions, c. regulating life processes, d. all of the above | a | Lesson: biochemical compound classification
Introduction to Biochemical Compounds:
Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means life. A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and ... |
NDQ_016279 | elements found in proteins but not in other biochemical compounds include | a. sulfur, b. nitrogen, c. phosphorus, d. two of the above | a | Lesson: biochemical compound classification
Introduction to Biochemical Compounds:
Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means life. A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and ... |
NDQ_016280 | almost all biochemical compounds are polymers. | a. true, b. false | a | Lesson: biochemical compound classification
Introduction to Biochemical Compounds:
Glucose is an example of a biochemical compound. The prefix bio- comes from the Greek word that means life. A biochemical compound is any carbon-based compound that is found in living things. Biochemical compounds make up the cells and ... |
NDQ_016284 | catabolic reactions are chemical reactions in living things that | a. release energy, b. are endothermic, c. break bonds, d. two of the above | d | Lesson: biochemical reaction chemistry
Chemical Reactions in Living Things:
Chemical reactions that take place inside living things are called biochemical reactions (bio- means life). Its not just for energy that living things depend on biochemical reactions. Every function and structure of a living organism depends o... |
NDQ_016285 | anabolic reactions are chemical reactions in living things that | a. form larger molecules, b. are exothermic, c. release energy, d. two of the above | a | Lesson: biochemical reaction chemistry
Chemical Reactions in Living Things:
Chemical reactions that take place inside living things are called biochemical reactions (bio- means life). Its not just for energy that living things depend on biochemical reactions. Every function and structure of a living organism depends o... |
NDQ_016287 | the reactants of photosynthesis are oxygen and water. | a. true, b. false | b | Lesson: biochemical reaction chemistry
Chemical Reactions in Living Things:
Chemical reactions that take place inside living things are called biochemical reactions (bio- means life). Its not just for energy that living things depend on biochemical reactions. Every function and structure of a living organism depends o... |
NDQ_016289 | photosynthesis is an anabolic reaction. | a. true, b. false | a | Lesson: biochemical reaction chemistry
Chemical Reactions in Living Things:
Chemical reactions that take place inside living things are called biochemical reactions (bio- means life). Its not just for energy that living things depend on biochemical reactions. Every function and structure of a living organism depends o... |
NDQ_016290 | cellular respiration is a catabolic reaction. | a. true, b. false | a | Lesson: biochemical reaction chemistry
Chemical Reactions in Living Things:
Chemical reactions that take place inside living things are called biochemical reactions (bio- means life). Its not just for energy that living things depend on biochemical reactions. Every function and structure of a living organism depends o... |
NDQ_016294 | electrons with the most energy are located closest to the nucleus of the atom. | a. true, b. false | b | Lesson: bohrs atomic model
Modeling the Atom:
The existence of the atom was first demonstrated around 1800 by John Dalton. Then, close to a century went by before J.J. Thomson discovered the first subatomic particle, the negatively charged electron. Because atoms are neutral in charge, Thomson thought that they must c... |
NDQ_016295 | bohr hypothesized that if an electron gained just the right amount of energy, it would | a. jump to the next higher energy level, b. drop down to the next lower energy level, c. move halfway to the next higher energy level, d. crash into the nucleus of the atom | a | Lesson: bohrs atomic model
Modeling the Atom:
The existence of the atom was first demonstrated around 1800 by John Dalton. Then, close to a century went by before J.J. Thomson discovered the first subatomic particle, the negatively charged electron. Because atoms are neutral in charge, Thomson thought that they must c... |
NDQ_016297 | the idea of the quantum was first introduced by | a. bohr, b. planck, c. thomson, d. rutherford | b | Lesson: bohrs atomic model
Modeling the Atom:
The existence of the atom was first demonstrated around 1800 by John Dalton. Then, close to a century went by before J.J. Thomson discovered the first subatomic particle, the negatively charged electron. Because atoms are neutral in charge, Thomson thought that they must c... |
NDQ_016298 | energy levels around the atomic nucleus correspond to quantum increases in energy. | a. true, b. false | a | Lesson: bohrs atomic model
Modeling the Atom:
The existence of the atom was first demonstrated around 1800 by John Dalton. Then, close to a century went by before J.J. Thomson discovered the first subatomic particle, the negatively charged electron. Because atoms are neutral in charge, Thomson thought that they must c... |
NDQ_016312 | which type(s) of chemical bonds may be polar bonds? | a. ionic bonds, b. metallic bonds, c. covalent bonds, d. two of the above | c | Lesson: bond polarity
Polar and Nonpolar Covalent Bonds:
Covalent bonds are chemical bonds between atoms of nonmetals that share valence electrons. In some covalent bonds, electrons are not shared equally between the two atoms. These are called polar covalent bonds. The Figure than the hydrogen atoms do because the nu... |
NDQ_016315 | which of the following molecules has (have) polar bonds? | a. water, b. carbon dioxide, c. formaldehyde, d. all of the above | d | Lesson: bond polarity
Polar and Nonpolar Covalent Bonds:
Covalent bonds are chemical bonds between atoms of nonmetals that share valence electrons. In some covalent bonds, electrons are not shared equally between the two atoms. These are called polar covalent bonds. The Figure than the hydrogen atoms do because the nu... |
NDQ_016316 | all molecules with polar bonds are polar molecules. | a. true, b. false | b | Lesson: bond polarity
Polar and Nonpolar Covalent Bonds:
Covalent bonds are chemical bonds between atoms of nonmetals that share valence electrons. In some covalent bonds, electrons are not shared equally between the two atoms. These are called polar covalent bonds. The Figure than the hydrogen atoms do because the nu... |
NDQ_016320 | the oxygen end of a water molecule is positively charged. | a. true, b. false | b | Lesson: bond polarity
Polar and Nonpolar Covalent Bonds:
Covalent bonds are chemical bonds between atoms of nonmetals that share valence electrons. In some covalent bonds, electrons are not shared equally between the two atoms. These are called polar covalent bonds. The Figure than the hydrogen atoms do because the nu... |
NDQ_016334 | a fluid exerts pressure only in an upward direction. | a. true, b. false | b | Lesson: buoyancy
What Is Buoyant Force:
Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy. What explains buoyant force? A fluid exerts pressure in all directions, but the pressure is greater at greater depth. Therefore,... |
NDQ_016335 | fluid pressure is greater at greater depth. | a. true, b. false | a | Lesson: buoyancy
What Is Buoyant Force:
Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy. What explains buoyant force? A fluid exerts pressure in all directions, but the pressure is greater at greater depth. Therefore,... |
NDQ_016336 | the fluid below an object exerts greater force on it than the fluid above the object. | a. true, b. false | a | Lesson: buoyancy
What Is Buoyant Force:
Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy. What explains buoyant force? A fluid exerts pressure in all directions, but the pressure is greater at greater depth. Therefore,... |
NDQ_016338 | an object floats in a fluid when the | a. buoyant force acting on the object is greater than the objects weight, b. objects weight is greater than the buoyant force acting on the object, c. objects weight is the same as buoyant force acting on the object, d. buoyant force acts only under and not above the object | a | Lesson: buoyancy
What Is Buoyant Force:
Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy. What explains buoyant force? A fluid exerts pressure in all directions, but the pressure is greater at greater depth. Therefore,... |
NDQ_016340 | a denser substance will | a. float on a less dense fluid, b. sink in a less dense fluid, c. become less dense in a less dense fluid, d. become more dense in a less dense fluid | b | Lesson: buoyancy
What Is Buoyant Force:
Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy. What explains buoyant force? A fluid exerts pressure in all directions, but the pressure is greater at greater depth. Therefore,... |
NDQ_016342 | any change in an objects motion is called velocity. | a. true, b. false | b | Lesson: calculating acceleration from force and mass
Acceleration Force and Mass:
A change in an objects motionsuch as Xander speeding up on his scooteris called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its ac... |
NDQ_016344 | the greater the net force acting on an object, the greater its acceleration will be. | a. true, b. false | a | Lesson: calculating acceleration from force and mass
Acceleration Force and Mass:
A change in an objects motionsuch as Xander speeding up on his scooteris called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its ac... |
NDQ_016345 | for a given net force, an object will accelerate less if it has a greater | a. mass, b. volume, c. speed, d. none of the above | a | Lesson: calculating acceleration from force and mass
Acceleration Force and Mass:
A change in an objects motionsuch as Xander speeding up on his scooteris called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its ac... |
NDQ_016348 | one newton is the force needed to cause a | a. 1-kg object to accelerate at 1 m/s2, b. 1-g object to accelerate at 1 cm/s2, c. 1-kg object to accelerate at 1 km/s2, d. none of the above | a | Lesson: calculating acceleration from force and mass
Acceleration Force and Mass:
A change in an objects motionsuch as Xander speeding up on his scooteris called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its ac... |
NDQ_016349 | the si unit for acceleration is | a. cm/s2, b. m/s2, c. km/s2, d. none of the above | b | Lesson: calculating acceleration from force and mass
Acceleration Force and Mass:
A change in an objects motionsuch as Xander speeding up on his scooteris called acceleration. Acceleration occurs whenever an object is acted upon by an unbalanced force. The greater the net force acting on the object, the greater its ac... |
NDQ_016354 | which equation is used to calculate average acceleration when only speed is changing? | a. average acceleration = v/t, b. average acceleration = t/v, c. average acceleration = d/t, d. average acceleration = v/t | a | Lesson: calculating acceleration from velocity and time
Calculating Average Acceleration in One Direction:
Calculating acceleration is complicated if both speed and direction are changing or if you want to know acceleration at any given instant in time. However, its relatively easy to calculate average acceleration ov... |
NDQ_016357 | it is easier to calculate acceleration for any given moment of time than to calculate average acceleration for a period of time. | a. true, b. false | b | Lesson: calculating acceleration from velocity and time
Calculating Average Acceleration in One Direction:
Calculating acceleration is complicated if both speed and direction are changing or if you want to know acceleration at any given instant in time. However, its relatively easy to calculate average acceleration ov... |
NDQ_016359 | the si unit for acceleration is | a. m/s, b. m/s2, c. m/s2, d. none of the above | c | Lesson: calculating acceleration from velocity and time
Calculating Average Acceleration in One Direction:
Calculating acceleration is complicated if both speed and direction are changing or if you want to know acceleration at any given instant in time. However, its relatively easy to calculate average acceleration ov... |
NDQ_016360 | which of the following units could represent acceleration? | a. cm/s, b. km/h2, c. m/h, d. cm/h | b | Lesson: calculating acceleration from velocity and time
Calculating Average Acceleration in One Direction:
Calculating acceleration is complicated if both speed and direction are changing or if you want to know acceleration at any given instant in time. However, its relatively easy to calculate average acceleration ov... |
NDQ_016374 | when calculating work, force is measured in | a. joules, b. newtons, c. foot-pounds, d. none of the above | b | Lesson: calculating work
Work Force and Distance:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
How Much Work:
The equation for work can be used to calcu... |
NDQ_016377 | one joule equals the amount of work that is done when 1 n of force moves an object over a distance of | a. 1 cm, b. 1 m, c. 1 km, d. none of the above | b | Lesson: calculating work
Work Force and Distance:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
How Much Work:
The equation for work can be used to calcu... |
NDQ_016378 | you can calculate force from work and distance with the equation | a. force = work x distance, b. force = work/distance, c. force = distance/work, d. force = work + distance | b | Lesson: calculating work
Work Force and Distance:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
How Much Work:
The equation for work can be used to calcu... |
NDQ_016379 | you can calculate distance from work and force with the equation | a. distance = work x force, b. distance = work/force, c. distance = force/work, d. distance = work + force | b | Lesson: calculating work
Work Force and Distance:
Work is the use of force to move an object. It is directly related to both the force applied to the object and the distance the object moves. Work can be calculated with this equation: Work = Force x Distance.
How Much Work:
The equation for work can be used to calcu... |
NDQ_016383 | carbohydrates consist of atoms of | a. carbon, b. hydrogen, c. oxygen, d. all of the above | d | Lesson: carbohydrate classification
What Are Carbohydrates:
Carbohydrates are one of four classes of biochemical compounds. The other three classes are proteins, lipids, and nucleic acids. In addition to cellulose, carbohydrates include sugars and starches. Carbohydrate molecules contain atoms of carbon, hydrogen, and... |
NDQ_016387 | plants stores extra glucose as starches. | a. true, b. false | a | Lesson: carbohydrate classification
What Are Carbohydrates:
Carbohydrates are one of four classes of biochemical compounds. The other three classes are proteins, lipids, and nucleic acids. In addition to cellulose, carbohydrates include sugars and starches. Carbohydrate molecules contain atoms of carbon, hydrogen, and... |
NDQ_016391 | cellulose is a polymer of starch. | a. true, b. false | b | Lesson: carbohydrate classification
What Are Carbohydrates:
Carbohydrates are one of four classes of biochemical compounds. The other three classes are proteins, lipids, and nucleic acids. In addition to cellulose, carbohydrates include sugars and starches. Carbohydrate molecules contain atoms of carbon, hydrogen, and... |
NDQ_016392 | about half of all known compounds contain carbon. | a. true, b. false | b | Lesson: carbon bonding
Carbon Carbon Everywhere:
Carbon is a very common ingredient of matter because it can combine with itself and with many other elements. It can form a great diversity of compounds, ranging in size from just a few atoms to thousands of atoms. There are millions of known carbon compounds, and carbo... |
NDQ_016396 | how many chemical bonds can each carbon atom form? | a. 1, b. 2, c. 3, d. 4 | d | Lesson: carbon bonding
Carbon Carbon Everywhere:
Carbon is a very common ingredient of matter because it can combine with itself and with many other elements. It can form a great diversity of compounds, ranging in size from just a few atoms to thousands of atoms. There are millions of known carbon compounds, and carbo... |
NDQ_016398 | methane is an example of a hydrocarbon. | a. true, b. false | a | Lesson: carbon bonding
Carbon Carbon Everywhere:
Carbon is a very common ingredient of matter because it can combine with itself and with many other elements. It can form a great diversity of compounds, ranging in size from just a few atoms to thousands of atoms. There are millions of known carbon compounds, and carbo... |
NDQ_016399 | carbon forms triple bonds with other carbon atoms in the compound named | a. ethane, b. ethene, c. ethyne, d. two of the above | c | Lesson: carbon bonding
Carbon Carbon Everywhere:
Carbon is a very common ingredient of matter because it can combine with itself and with many other elements. It can form a great diversity of compounds, ranging in size from just a few atoms to thousands of atoms. There are millions of known carbon compounds, and carbo... |
NDQ_016400 | when two carbon atoms form triple bonds, how many electrons do they share? | a. 3, b. 4, c. 5, d. 6 | d | Lesson: carbon bonding
Carbon Carbon Everywhere:
Carbon is a very common ingredient of matter because it can combine with itself and with many other elements. It can form a great diversity of compounds, ranging in size from just a few atoms to thousands of atoms. There are millions of known carbon compounds, and carbo... |
NDQ_016401 | carbon can form more compounds than any other element. | a. true, b. false | a | Lesson: carbon bonding
Carbon Carbon Everywhere:
Carbon is a very common ingredient of matter because it can combine with itself and with many other elements. It can form a great diversity of compounds, ranging in size from just a few atoms to thousands of atoms. There are millions of known carbon compounds, and carbo... |
NDQ_016405 | examples of naturally occurring carbon polymers include | a. cellulose, b. rubber, c. plastic, d. two of the above | d | Lesson: carbon monomers and polymers
Out of Many One:
Carbon has a unique ability to form covalent bonds with many other atoms. It can bond with other carbon atoms as well as with atoms of other elements. Because of this ability, carbon often forms polymers. A polymer is a large molecule that is made out of many small... |
NDQ_016406 | rubber consists of the monomer named ethylene. | a. true, b. false | b | Lesson: carbon monomers and polymers
Out of Many One:
Carbon has a unique ability to form covalent bonds with many other atoms. It can bond with other carbon atoms as well as with atoms of other elements. Because of this ability, carbon often forms polymers. A polymer is a large molecule that is made out of many small... |
NDQ_016407 | any given polymer consists of just one type of monomer. | a. true, b. false | b | Lesson: carbon monomers and polymers
Out of Many One:
Carbon has a unique ability to form covalent bonds with many other atoms. It can bond with other carbon atoms as well as with atoms of other elements. Because of this ability, carbon often forms polymers. A polymer is a large molecule that is made out of many small... |
NDQ_016413 | a catalyst is a reactant in the reaction it catalyzes. | a. true, b. false | b | Lesson: catalysts
What Is A Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction. The presence of a catalyst is one of several factors that influence the rate of chemical reactions. (Other factors include the temperature, concentration, and surface area of reactants.) A catalyst isnt a re... |
NDQ_016414 | a catalyst is used up in the reaction it catalyzes. | a. true, b. false | b | Lesson: catalysts
What Is A Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction. The presence of a catalyst is one of several factors that influence the rate of chemical reactions. (Other factors include the temperature, concentration, and surface area of reactants.) A catalyst isnt a re... |
NDQ_016417 | the compound that speeds up the breakdown of starch to sugar in your mouth is | a. an enzyme, b. called amylase, c. also found in your small intestine, d. all of the above | d | Lesson: catalysts
What Is A Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction. The presence of a catalyst is one of several factors that influence the rate of chemical reactions. (Other factors include the temperature, concentration, and surface area of reactants.) A catalyst isnt a re... |
NDQ_016418 | more than 1000 different enzymes are necessary for human life. | a. true, b. false | a | Lesson: catalysts
What Is A Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction. The presence of a catalyst is one of several factors that influence the rate of chemical reactions. (Other factors include the temperature, concentration, and surface area of reactants.) A catalyst isnt a re... |
NDQ_016419 | the presence or absence of a catalyst is the only factor that affects the rate of a chemical reaction. | a. true, b. false | b | Lesson: catalysts
What Is A Catalyst:
A catalyst is a substance that increases the rate of a chemical reaction. The presence of a catalyst is one of several factors that influence the rate of chemical reactions. (Other factors include the temperature, concentration, and surface area of reactants.) A catalyst isnt a re... |
NDQ_016425 | organisms that make glucose are called autotrophs. | a. true, b. false | a | Lesson: cellular respiration reactions
What is Cellular Respiration:
Cellular Respiration is the process in which the cells of living things break down the organic compound glucose with oxygen to produce carbon dioxide and water. The overall chemical equation for cellular respiration is: C6 H12 O6 + 6O2 6CO2 + 6H2 O ... |
NDQ_016426 | cellular respiration takes place only in the cells of heterotrophs. | a. true, b. false | b | Lesson: cellular respiration reactions
What is Cellular Respiration:
Cellular Respiration is the process in which the cells of living things break down the organic compound glucose with oxygen to produce carbon dioxide and water. The overall chemical equation for cellular respiration is: C6 H12 O6 + 6O2 6CO2 + 6H2 O ... |
NDQ_016428 | the chemical reactions of cellular respiration are anabolic reactions. | a. true, b. false | b | Lesson: cellular respiration reactions
What is Cellular Respiration:
Cellular Respiration is the process in which the cells of living things break down the organic compound glucose with oxygen to produce carbon dioxide and water. The overall chemical equation for cellular respiration is: C6 H12 O6 + 6O2 6CO2 + 6H2 O ... |
NDQ_016429 | which compound directly powers biochemical reactions in cells? | a. glucose, b. carbon dioxide, c. adenosine triphosphate, d. none of the above | c | Lesson: cellular respiration reactions
What is Cellular Respiration:
Cellular Respiration is the process in which the cells of living things break down the organic compound glucose with oxygen to produce carbon dioxide and water. The overall chemical equation for cellular respiration is: C6 H12 O6 + 6O2 6CO2 + 6H2 O ... |
NDQ_016430 | during cellular respiration, chemical energy stored in glucose changes to | a. heat, b. light, c. chemical energy in atp, d. two of the above | d | Lesson: cellular respiration reactions
What is Cellular Respiration:
Cellular Respiration is the process in which the cells of living things break down the organic compound glucose with oxygen to produce carbon dioxide and water. The overall chemical equation for cellular respiration is: C6 H12 O6 + 6O2 6CO2 + 6H2 O ... |
NDQ_016463 | valence electrons are the basis of all chemical bonds. | a. true, b. false | a | Lesson: chemical bond
What Is a Chemical Bond:
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the bas... |
NDQ_016466 | in covalent bonds, atoms | a. share electrons, b. transfer electrons, c. lose or gain electrons, d. two of the above | a | Lesson: chemical bond
What Is a Chemical Bond:
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the bas... |
NDQ_016468 | an example of a compound that contains ionic bonds is water. | a. true, b. false | b | Lesson: chemical bond
What Is a Chemical Bond:
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the bas... |
NDQ_016469 | a metallic bond is a bond between a positively charged metal ion and | a. a negatively charged halogen ion, b. a negatively charged nonmetal ion, c. the valence electrons of several metal ions, d. the valence electrons of a halogen ion | c | Lesson: chemical bond
What Is a Chemical Bond:
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the bas... |
NDQ_016470 | metallic bonds form a lattice-like structure. | a. true, b. false | a | Lesson: chemical bond
What Is a Chemical Bond:
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the bas... |
NDQ_016471 | metals can be involved in | a. covalent bonds, b. metallic bonds, c. ionic bonds, d. two of the above | d | Lesson: chemical bond
What Is a Chemical Bond:
A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the bas... |
NDQ_016483 | the substances that form in a chemical reaction are completely different from the substances that start the reaction. | a. true, b. false | a | Lesson: chemical equations
What Is A Chemical Equation:
A chemical equation is a shorthand way to sum up what occurs in a chemical reaction. The general form of a chemical equation is: Reactants Products The reactants in a chemical equation are the substances that begin the reaction, and the products are the substanc... |
NDQ_016489 | a chemical equation is balanced when | a. the reactants are the same as the products, b. the same atoms and molecules appear on each side of the equation, c. the same number of each type of atom appears on both sides of the arrow, d. none of the above | c | Lesson: chemical equations
What Is A Chemical Equation:
A chemical equation is a shorthand way to sum up what occurs in a chemical reaction. The general form of a chemical equation is: Reactants Products The reactants in a chemical equation are the substances that begin the reaction, and the products are the substanc... |
NDQ_016491 | which of the following chemical equations is balanced? | a. 3fe + 3o2 3fe2o3, b. 2fe + o2 fe2o3, c. 4fe + 2o2 3fe2o3, d. 4fe + 3o2 2fe2o3 | d | Lesson: chemical equations
What Is A Chemical Equation:
A chemical equation is a shorthand way to sum up what occurs in a chemical reaction. The general form of a chemical equation is: Reactants Products The reactants in a chemical equation are the substances that begin the reaction, and the products are the substanc... |
NDQ_016492 | a given chemical compound always has exactly the same ratio of elements. | a. true, b. false | a | Lesson: chemical formula
Representing Compounds:
In a chemical formula, the elements in a compound are represented by their chemical symbols, and the ratio of different elements is represented by subscripts. Consider the compound water as an example. Each water molecule contains two hydrogen atoms and one oxygen atom.... |
NDQ_016496 | when there is just one atom of an element in a molecule, this atom is represented by the | a. subscript 1, b. subscript 0, c. absence of a subscript, d. none of the above | c | Lesson: chemical formula
Representing Compounds:
In a chemical formula, the elements in a compound are represented by their chemical symbols, and the ratio of different elements is represented by subscripts. Consider the compound water as an example. Each water molecule contains two hydrogen atoms and one oxygen atom.... |
NDQ_016497 | in the formula for an ionic compound, the negative ion is always written first. | a. true, b. false | b | Lesson: chemical formula
Representing Compounds:
In a chemical formula, the elements in a compound are represented by their chemical symbols, and the ratio of different elements is represented by subscripts. Consider the compound water as an example. Each water molecule contains two hydrogen atoms and one oxygen atom.... |
NDQ_016499 | correct rules for writing the chemical formulas of covalent compounds include which of the following? | a. the element that is farther to the left in the periodic table is written first, b. the element that is farther to the right in the periodic table is written first, c. if both elements are in the same group of the periodic table, the one with the lower period number is written first, d. two of the above | a | Lesson: chemical formula
Representing Compounds:
In a chemical formula, the elements in a compound are represented by their chemical symbols, and the ratio of different elements is represented by subscripts. Consider the compound water as an example. Each water molecule contains two hydrogen atoms and one oxygen atom.... |
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