question stringlengths 10 867 | subject stringclasses 24
values | choices listlengths 4 4 | answer stringclasses 4
values |
|---|---|---|---|
When checked with an ohm meter an open resistor reads | electrical_engineering | [
"high but within tolerance.",
"low but not zero.",
"zero.",
"infinite."
] | D |
Which one of the following is not a vectored interrupt? | electrical_engineering | [
"TRAP.",
"RST 7.5.",
"RST 6.5.",
"INTR."
] | D |
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect | electrical_engineering | [
"only the magnitude of the quantity being measured.",
"only phase of the quantity being measured.",
"both of above.",
"magnitude, phase and waveform of the quantity being measured."
] | D |
If a circuit consists of two mass elements, two spring elements and four friction elements. Find the order of transfer function? | electrical_engineering | [
"2",
"4",
"6",
"12"
] | B |
A capacitor carries a charge of 0.1 C at 5 V. Its capacitance is | electrical_engineering | [
"0.02 F",
"0.5 F",
"0.05 F",
"0.2 F"
] | A |
Inside a hollow conducting sphere | electrical_engineering | [
"electric field is zero.",
"electric field is a non zero constant.",
"electric field changes with magnitude of the charge given to the conductor.",
"electric field changes with distance from the center of the sphere."
] | A |
What will be the total flux emitted by a source of 60 candle power? | electrical_engineering | [
"754.2 lumens.",
"0.001326 lumens.",
"60 lumens.",
"None of these."
] | A |
For audio frequency applications, the popular oscillator used is | electrical_engineering | [
"Wien bridge oscillator",
"Hartley oscillator",
"Crystal oscillator",
"Phase shift oscillator"
] | A |
Which number system has a base of 16 | electrical_engineering | [
"Decimal",
"Octal",
"Hexadecimal",
"None"
] | C |
A motor has a thermal heating time constant of 50 mm. When the motor runs continuous of full scale, its final temperature rise is 80° C, what would be the temperature rise after 1 hour, if the motor runs continuously on full load? | electrical_engineering | [
"55.9° C.",
"58° C.",
"56° C.",
"60° C."
] | A |
Which of the following is/are the advantages of a closed loop control system? | electrical_engineering | [
"The closed loop systems are accurate.",
"The closed loop systems are less affected by noise.",
"both A and B.",
"nether A nor B."
] | C |
A digital circuit that can store on bit is a | electrical_engineering | [
"XOR gate",
"flip-flop",
"gate",
"registor"
] | B |
A combinational PLD with a programmable AND array and a fixed OR array is called a | electrical_engineering | [
"PLD",
"PROM",
"PAL",
"PLA"
] | C |
For dielectric heating the range of frequency normally employed is | electrical_engineering | [
"10 KHz to 100 KHz.",
"100 KHz to 10 MHz.",
"1 MHz to 10 MHz.",
"10 MHz to 40 MHz."
] | D |
Colton and his dad bought a gallon of paint that cost $13. They also bought 2 brushes that cost $9 each. What was the total cost, not including tax, of the brushes and the paint they bought? | elementary_mathematics | [
"$22 ",
"$24 ",
"$31 ",
"$35 "
] | C |
Solve for y. y – 2 + 3y = 10 | elementary_mathematics | [
"2",
"3",
"4",
"5"
] | B |
Solve 3 over 2 * w = 66. | elementary_mathematics | [
"33",
"44",
"88",
"99"
] | B |
Wendy wants to take a survey to determine which flavor of ice cream is the most popular at her school. Which of the following methods is the best way for her to choose a random sample of the students at her school? | elementary_mathematics | [
"selecting ten students from each homeroom",
"selecting members of the girls’ softball team",
"selecting members of the boys’ basketball team",
"selecting students who like her favorite flavor of ice cream"
] | A |
Write 5.875 as a mixed number or fraction in simplest form. | elementary_mathematics | [
"5 and 8 over 9",
"5 and 7 over 8",
"7 over 8",
"5 and 87 over 105"
] | B |
Solve the equation 124 = m + 34. | elementary_mathematics | [
"158",
"90",
"88",
"4,216"
] | B |
Zelma buys p pounds of bananas for 40 cents per pound. She pays the clerk with a twenty-dollar bill. The clerk subtracts the total cost of the bananas from the twenty-dollar bill to determine the amount of change to give Zelma. Which expression represents the amount of change Zelma should receive? | elementary_mathematics | [
"p - 20",
"20 - 40p",
"20 - 0.40p",
"0.40p - 20"
] | C |
Celia has a large container in which four different kinds of coins are thoroughly mixed. She wants to take a sample of her coins to estimate which kind of coin she has the most. Which of the following methods is the best way for her to select a sample? | elementary_mathematics | [
"taking one coin from the container",
"taking coins until she has one of every kind",
"taking ten coins of each type from the container",
"taking thirty coins out of the container without looking"
] | D |
In which situation can the expression 64 + 8 be used? | elementary_mathematics | [
"There are 8 buses with 64 students on each bus.",
"Ms. Vance has 8 pens and 64 pencils in a container.",
"There are 64 books in a bookcase and 8 booksare removed.",
"Mr. Juarez has 64 cups and puts an equal numberon each of 8 tables."
] | D |
Which expression is equivalent to (5 + 2) x 8? | elementary_mathematics | [
"(8 x 5) + (8 x 2)",
"(5 x 8) + (5x 2)",
"8 x (5x2)",
"(5x8)x2"
] | A |
The number of points Jaden scored in a game is less than 45, and is also a multiple of 7. How many points could Jaden have scored? | elementary_mathematics | [
"17",
"35",
"52",
"70"
] | B |
Which method can be used to solve 11 x 13? | elementary_mathematics | [
"Multiply 11 x 10 and 10 x 3, then add the two products.",
"Multiply 11 x 10 and 11 x 3, then add the two products.",
"Multiply 11 x 100 and 10 x 3, then add the two products.",
"Multiply 11 x 100 and 11 x 3, then add the two products."
] | B |
Wendy bought 30 packs of gum. Each pack had 5 pieces. She multiplied 30 × 5 to find the number of pieces of gum she bought. How many pieces of gum did Wendy buy? | elementary_mathematics | [
"15",
"35",
"150",
"305"
] | C |
Jan scored 3 more points in the basketball game than Salah. Cindy scored 22 points, which was twice as many points as Jan. How many points did Salah score? | elementary_mathematics | [
"8",
"11",
"14",
"19"
] | A |
The ticket prices to a play are $5.00 for teachers and $3.00 for students. How much will it cost for a group of 71 students and 5 teachers to see the play? | elementary_mathematics | [
"$228.00 ",
"$238.00 ",
"$370.00 ",
"$380.00 "
] | B |
Use the equation below to answer the question. 0.75 × 6.5 = m Which expression shows one way to solve the equation? | elementary_mathematics | [
"75 × 65 ÷ 1,000",
"75 × 650 ÷ 1,000",
"0.7 × 6 + 0.7 × 5 + 0.5 × 6 + 0.5 × 5",
"0.7 × 6 + 0.7 × 0.5 + 0.5 × 6 + 0.5 × 0.5"
] | A |
Debnil has 6 teaspoons of salt. The ratio of teaspoons to tablespoons is 3 : 1. How many tablespoons of salt does Debnil have? | elementary_mathematics | [
"18-Jan",
"2-Jan",
"2",
"18"
] | C |
A scientist measured the diameters of four human hairs. The diameters, in millimeters, were 0.091, 0.169, 0.17, and 0.023. Which inequality correctly compares the diameters of two of the human hairs? | elementary_mathematics | [
"0.17 > 0.023",
"0.091 < 0.023",
"0.169 > 0.17",
"0.17 < 0.091"
] | A |
There are 7 days in a week. In the month of February, there are 28 days this year. How many times as many days are there in February than are in one week? | elementary_mathematics | [
"4 times",
"7 times",
"21 times",
"35 times"
] | A |
Solve −2k = −34.8. | elementary_mathematics | [
"−69.6",
"−17.4",
"17.4",
"69.6"
] | D |
Frankie’s baseball team scored 16 runs in a game. Max’s baseball team scored 8 runs in a game. Which statement about the number of runs scored by Frankie’s and Max’s baseball teams is true? | elementary_mathematics | [
"Frankie’s team scored 2 times as many runs as Max’s team because 16 = 2 × 8.",
"Frankie’s team scored 2 times as many runs as Max’s team because 8 = 2 × 16.",
"Max’s team scored 2 times as many runs as Frankie’s team because 16 = 2 × 8.",
"Max’s team scored 2 times as many runs as Frankie’s team because 8 = ... | A |
Mr. Carson drove 1,027 miles in April. He drove 988 miles in May. Mr. Carson used the expression below to find how many more miles he drove in April than in May. 1,027 – 988 How many more miles did Mr. Carson drive in April than in May? | elementary_mathematics | [
"39 miles",
"139 miles",
"161 miles",
"1,961 miles"
] | A |
Collin spent 7 hours volunteering last month. Vanessa spent 21 hours volunteering last month. Which equation correctly shows how many times more hours Vanessa spent volunteering last month than Collin? | elementary_mathematics | [
"7 × 3 = 21",
"7 × 14 = 21",
"21 × 3 = 63",
"21 × 7 = 147"
] | A |
George has $23 to spend on art supplies. He wants to buy markers, paper, and glue. If the total cost of the markers and paper is more than $14, which inequality represents the dollar amount, p, George can spend on glue? | elementary_mathematics | [
"p<9",
"p>9",
"p<37",
"p>37"
] | A |
What is the square of 15? | elementary_mathematics | [
"15",
"15-Jan",
"225",
"256"
] | C |
Which expression is equivalent to 4 x 9? | elementary_mathematics | [
"(4x 4) + (4x5)",
"(4+4) x (4+5)",
"(4+4)+(4+5)",
"(4x 4) x (4x5)"
] | A |
Carmen saved 592 pennies. Her sister saved 128 pennies. Together, they put 250 pennies in wrappers and took them to the bank. Whatis the total number of pennies, rounded to the nearest hundred, Carmen and her sister have left? | elementary_mathematics | [
"300",
"500",
"700",
"1,000"
] | B |
The expression –105 + (–14) + 34 simplifies to which of the following? | elementary_mathematics | [
"–57",
"–75",
"–85",
"143"
] | C |
Solve the equation 29 = x − 17. | elementary_mathematics | [
"12",
"−12",
"−46",
"46"
] | D |
What is the greatest common divisor of 54, 36, and 24? | elementary_mathematics | [
"2",
"3",
"6",
"9"
] | C |
If 50% of a number is 20, what is 75% of the number? | elementary_mathematics | [
"8",
"15",
"30",
"45"
] | C |
A librarian receives two boxes of booksfor the library. The first box has 136 books. The second box has 58 fewer books than the first box. What is the total number of books the librarian receives? | elementary_mathematics | [
"58",
"78",
"194",
"214"
] | D |
Use rounding to estimate the product of 8.2 • 6.43 to the nearest whole number. | elementary_mathematics | [
"48",
"56",
"62",
"24"
] | B |
Residents of a small city voted on whether to allow a developer to build a shopping center. The number of votes in favor of the shopping center was 4,400. The number of votes against the shopping center was 17,600. What percent of the voters were in favor of building the shopping center? | elementary_mathematics | [
"20%",
"25%",
"40%",
"44%"
] | A |
Which situation can be solved using the expression 21 / 3? | elementary_mathematics | [
"finding the number of shirts when there are 3 groups of 21 shirts",
"finding the number of dresses when 21 more dresses are placed on a rack with 3 dresses",
"finding the number of jackets left over when 3 out of 21 jackets are sold",
"finding the number of skirts on each rack when a total of 21 skirts are p... | D |
Dr. Sperline is ordering a chemical for his students to use in an experiment. He knows that each student will need to use 0.797 grams of magnesium in the first step of the experiment and 0.892 grams in a later step. He uses front-end estimation with an adjustment to figure out the approximate amount of magnesium needed by each student. What is his estimate? | elementary_mathematics | [
"1.4 g",
"1.7 g",
"1.6 g",
"1.5 g"
] | B |
What is the value of |3 + 5| – |-4|? | elementary_mathematics | [
"12",
"-4",
"4",
"12"
] | C |
Dawn needs to fix windows in her house. She must buy 3 feet of wood, which costs $7 per foot. She also needs to buy 4 pieces of glass. Each piece of glass costs $23. What will be the total cost for fixing the windows? | elementary_mathematics | [
"$30 ",
"$90 ",
"$113 ",
"$176 "
] | C |
All the students in the sixth grade either purchased their lunch or brought their lunch from home on Monday. 24% of the students purchased their lunch. 190 students brought their lunch from home. How many students are in the sixth grade? | elementary_mathematics | [
"76",
"166",
"214",
"250"
] | D |
What is the rule for the pattern? 41, 38, 35, 32, 29,... | elementary_mathematics | [
"divide by 3",
"divide by 4",
"subtract 3",
"subtract 4"
] | C |
What is x if 3 x = 84 ? | elementary_mathematics | [
"20",
"21",
"26",
"28"
] | D |
A gradual drop in the water level of a large lake divided it into three smaller lakes. The division separated a single population of fish into three smaller, isolated populations. After many generations it was determined that the three populations of fish had become three separate species. Which of the following is most likely correct about the three species? | high_school_biology | [
"There are differences in the nucleotide sequences of certain gene alleles among the species.",
"There are differences in the amino acid specified by each codon among the species.",
"There are differences in the type of cleavage that produces the first blastomeres among the species.",
"There are differences i... | A |
Hawkmoths are insects that are similar in appearance and behavior to hummingbirds. Which of the following is LEAST valid? | high_school_biology | [
"These organisms are examples of convergent evolution.",
"These organisms were subjected to similar environmental conditions.",
"These organisms are genetically related to each other.",
"These organisms have analogous structures."
] | C |
A cell from the leaf of the aquatic plant Elodea was soaked in a 15 percent sugar solution, and its contents soon separated from the cell wall and formed a mass in the center of the cell. All of the following statements are true about this event EXCEPT | high_school_biology | [
"the vacuole lost water and became smaller",
"the space between the cell wall and the cell membrane expanded",
"the large vacuole contained a solution with much lower osmotic pressure than that of the sugar solution",
"the concentration of solutes in the extracellular environment is hypertonic with respect to... | D |
Which of Darwin's ideas had the strongest connection to Darwin having read Malthus's essay on human population growth? | high_school_biology | [
"Descent with modification",
"Variation among individuals in a population",
"Struggle for existence",
"The ability of related species to be conceptualized in \"tree thinking\""
] | C |
Which of the following does NOT take place in the small intestine? | high_school_biology | [
"Pancreatic lipase breaks down fats to fatty acids and glycerol.",
"Pepsin breaks down proteins to amino acids.",
"Pancreatic amylase breaks down carbohydrates into simple sugars.",
"Bile emulsifies fats into smaller fat particles."
] | B |
In a certain population of squirrels that is in Hardy-Weinberg equilibrium, black color is a recessive phenotype present in 9 percent of the squirrels, and 91 percent are gray. What percentage of the population is homozygous dominant for this trait? | high_school_biology | [
"21 percent",
"30 percent",
"49 percent",
"70 percent"
] | C |
A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of the gametes produced in the population contain the A1 allele. If the population is in Hardy-Weinberg equilibrium, what proportion of the flies carry both A1 and A2? | high_school_biology | [
"0.7",
"0.49",
"0.21",
"0.42"
] | D |
The moist skin of earthworms, spiracles of grasshoppers, and the mucus membranes lining alveoli are all associated with the process of | high_school_biology | [
"excretion",
"respiration",
"circulation",
"digestion"
] | B |
Metafemale syndrome, a disorder in which a female has an extra X chromosome, is the result of nondisjunction. The failure in oogenesis that could produce this would occur in | high_school_biology | [
"metaphase I",
"metaphase II",
"telophase I",
"anaphase II"
] | D |
All of the following statements are correct regarding alleles EXCEPT | high_school_biology | [
"alleles are alternative forms of the same gene",
"alleles are found on corresponding loci of homologous chromosomes",
"a gene can have more than two alleles",
"an individual with two identical alleles is said to be heterozygous with respect to that gene"
] | D |
High fructose corn syrup (HFCS) is a sweetener containing fructose that is derived from corn starch and often added to soft drinks. Which of the following reactions would most likely be involved in the production of HFCS? (The letter "n" indicates multiple copies of a molecule in a polymer.) | high_school_biology | [
"(glucose)n → polysaccharide",
"sucrose → fructose + glucose",
"glucose → fructose",
"starch → (fructose)n"
] | C |
Which of the following processes occur in the cytoplasm of an eukaryotic cell? I. DNA replication II. Transcription III. Translation | high_school_biology | [
"I only",
"III only",
"II and III only",
"I, II, and III"
] | B |
Which of the following statements is correct about a man who has hemophilia and whose wife does not have the disease and who does not have any relatives with the disease? | high_school_biology | [
"All his daughters will have the disease.",
"All his sons will have the disease.",
"All his sons will be carriers.",
"All his daughters will be carriers."
] | D |
Destruction of all beta cells in the pancreas will cause which of the following to occur? | high_school_biology | [
"Glucagon secretion will stop and blood glucose levels will increase.",
"Glucagon secretion will stop and blood glucose levels will decrease.",
"Glucagon secretion will stop and digestive enzymes will be secreted.",
"Insulin secretion will stop and blood glucose levels will increase."
] | D |
Which definition of evolution would have been most foreign to Charles Darwin during his lifetime? | high_school_biology | [
"change in gene frequency in gene pools",
"descent with modification",
"the gradual change of a population's heritable traits over generations",
"populations becoming better adapted to their environments over the course of generations"
] | A |
Which of the following statements about photosynthesis is incorrect? | high_school_biology | [
"H2O is an input to the light-dependent reactions.",
"CO2 is an input to the Calvin cycle.",
"Photosystems I and II both play a role in the cyclic light reactions.",
"O2 is a product of the light-dependent reactions."
] | C |
Similar evolutionary changes occurring in two species that can be related or unrelated. | high_school_biology | [
"Divergent evolution",
"Convergent evolution",
"Parallel evolution",
"Coevolution"
] | C |
All of the following are differences between prokaryotes and eukaryotes EXCEPT | high_school_biology | [
"eukaryotes have linear chromosomes, while prokaryotes have circular chromosomes",
"eukaryotes possess double stranded DNA, while prokaryotes possess single stranded DNA",
"eukaryotes process their mRNA, while in prokaryotes, transcription and translation occur simultaneously",
"eukaryotes contain membrane-bo... | A |
This biome is the driest of the land biomes and experiences the greatest daily temperature fluctuations. | high_school_biology | [
"Desert",
"Tundra",
"Taiga",
"Deciduous forests"
] | A |
Which of these naturalists synthesized a concept of natural selection independently of Darwin? | high_school_biology | [
"Charles Lyell",
"Gregor Mendel",
"Alfred Wallace",
"John Henslow"
] | C |
In reptile eggs, the extraembryonic membrane that functions in excretion and respiration is the | high_school_biology | [
"amnion",
"chorion",
"allantois",
"yolk sac"
] | C |
Which of the following statements describes the structural level of a protein that is least affected by hydrogen bonding? | high_school_biology | [
"Primary structure depends on the sequence of amino acids.",
"Tertiary structure has a shape dependent on the interactions of side chains of amino acids.",
"Quaternary structure results from the aggregation of more than one polypeptide unit.",
"An α-helix is an example of a secondary structure of a polypeptid... | A |
Three distinct bird species, flicker, woodpecker, and elf owl, all inhabit a large cactus, Cereus giganteus, in the desert of Arizona. Since competition among these birds rarely occurs, the most likely explanation for this phenomenon is that these birds | high_school_biology | [
"have a short supply of resources",
"have different ecological niches",
"do not live together long",
"are unable to breed"
] | B |
The synthesis of new proteins necessary for lactose utilization by the bacterium E. coli using the lac operon is regulated | high_school_biology | [
"by the synthesis of additional ribosomes",
"at the transcription stage",
"at the translation stage",
"by differential replication of the DNA that codes for lactose-utilizing mechanisms"
] | B |
All of the following statements describe the unique characteristics of water EXCEPT | high_school_biology | [
"it is a polar solvent",
"it forms hydrogen bonds with disaccharides",
"it can dissociate into hydrogen ions and hydroxide ions",
"it is a hydrophobic solvent"
] | D |
In DNA replication, which of the following does NOT occur? | high_school_biology | [
"Helicase unwinds the double helix.",
"DNA ligase links the Okazaki fragments.",
"RNA polymerase is used to elongate both chains of the helix.",
"DNA strands grow in the 5' to 3' direction."
] | C |
The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data? | high_school_biology | [
"Humans and bats evolved by natural selection, and whales evolved by Lamarckian mechanisms.",
"Forelimb evolution was adaptive in people and bats, but not in whales.",
"Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.",
"Genes mutate faster in whales than ... | C |
Some animals have patterns that can cause a predator to think twice before attacking. | high_school_biology | [
"Aposomatic coloration",
"Batesian mimicry",
"Deceptive markings",
"Cryptic coloration"
] | C |
Which of the following statements is correct about the DNA content of a particular diploid cell just prior to mitosis if the DNA content of the same diploid cell in G1 is X? | high_school_biology | [
"The DNA content of the cell in metaphase I is 0.5X",
"The DNA content of the cell in metaphase I is X.",
"The DNA content of the cell in metaphase I is 2X.",
"The DNA content of the cell in metaphase I is 4X."
] | C |
Which of the following is an example of a coupling of an exergonic reaction with an endergonic one? | high_school_biology | [
"Unicellular organisms that live in freshwater, such as amoeba, must pump out excess water using their contractile vacuoles.",
"The enzyme lactase binds with lactose to produce molecules of glucose and galactose.",
"Electrons escaping from chlorophyll a are replaced by those released by the hydrolysis of water.... | D |
Which of the following tends to be highest on the trophic pyramid? | high_school_biology | [
"Primary consumers",
"Herbivores",
"Primary carnivores",
"Primary producers"
] | C |
Which of the following changes in a gamete is most likely to lead to a heritable change in a protein? | high_school_biology | [
"Deleting two nucleotides from the middle of an intron",
"Deleting two nucleotides immediately upstream of a gene promoter",
"Inserting two nucleotides in the genome at the beginning of a codon",
"Adding two nucleotides to the poly(A) tail of an mRNA"
] | C |
Consider the Lewis structures for the following molecules: CO2, CO32-, NO2-, and NO3-. Which molecule would have the smallest bond angle between terminal atoms? | high_school_chemistry | [
"CO2",
"CO32-",
"NO2-",
"NO3-"
] | C |
An element in its ground state | high_school_chemistry | [
"has all of its electrons in the lowest possible energy levels",
"is an element as found in nature",
"is an element that is unreactive and found free in nature",
"has all of its electrons paired"
] | A |
Based on periodic relationships, the bond strength, and the concept relating bond strength to acid strengths, which of the following correctly predicts the strength of binary acids from strongest to weakest? | high_school_chemistry | [
"H2Se > H2O > H2S",
"H2Se > H2S > H2O",
"H2O < H2S < H2Se",
"H2O > H2S > H2Se"
] | B |
Chemical reactions can be classified as either heterogeneous or homogeneous. Which of the following equations below is best classified as a heterogeneous reaction? | high_school_chemistry | [
"2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)",
"2SO2(aq) + O2(g) → 2SO3(g)",
"C2H2(g) + 5N2O(g) → CO2(g) + H2O(g) + 5N2(g)",
"C(s) + H2O(g) → H2(g) + CO(g)"
] | D |
The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 signifies the ground state of the element | high_school_chemistry | [
"V",
"Ti",
"Co",
"Ca"
] | D |
Which of the following lists the electromagnetic spectral regions in order of decreasing wavelength? | high_school_chemistry | [
"ultraviolet, visible, infrared, X-ray",
"X-ray, visible, ultraviolet, infrared",
"X-ray, ultraviolet, visible, infrared",
"infrared, visible, ultraviolet, X-ray"
] | D |
Which of the following pairs of substances would make a good buffer solution? | high_school_chemistry | [
"HC2H3O2(aq) and NaC2H3O2(aq)",
"H2SO4(aq) and LiOH(aq)",
"HCl(aq) and KCl(aq)",
"HF(aq) and NH3(aq)"
] | A |
Consider the following reaction showing photosynthesis: 6CO2(g) + 6H2O(l) → C6H12O6(s) + 6O2(g) DH = + 2800 kJ/mol Which of the following is true regarding the thermal energy in this system? | high_school_chemistry | [
"It is transferred from the surroundings to the reaction.",
"It is transferred from the reaction to the surroundings.",
"It is transferred from the reactants to the products.",
"It is transferred from the products to the reactants."
] | A |
The average mass, in grams, of one mole of carbon atoms is equal to | high_school_chemistry | [
"the average mass of a single carbon atom, measured in amus.",
"the ratio of the number of carbon atoms to the mass of a single carbon atom.",
"the number of carbon atoms in one amu of carbon.",
"the mass, in grams, of the most abundant isotope of carbon."
] | A |
Dissolving one mole of each of the oxoacids HNO2, HClO4, H2CO3, and H3PO4 in 2.0 L of distilled water results in solutions with different pH values. Arrange these acid solutions from the one with the highest pH to the one with the lowest pH. | high_school_chemistry | [
"HNO2 > HClO4 > H2CO3 > H3PO4",
"HClO4 > HNO2 > H2CO3 > H3PO4",
"H2CO3 > H3PO4 > HNO2 > HClO4",
"H2CO3 > HNO2 > HClO4 > H3PO4"
] | C |
Twenty-five milligrams of sucrose (C12H22O11) are dissolved in enough water to make 1.00 liter of solution. What is the molality of the solution? | high_school_chemistry | [
"7.3 × 10^-5",
"7.31 × 10^-2",
"73.1",
"1.36"
] | A |
The first ionization energy of sodium is 496 kJ/mol, and its atomic radius is 186 pm. | high_school_chemistry | [
"160 pm, 737 kJ/mol",
"86 pm, 398 kJ/mol",
"235 pm, 523 kJ/mol",
"240 pm, 1200 kJ/mol"
] | A |
A large positive value for the standard Gibbs free energy change (ΔG°) for a reaction means | high_school_chemistry | [
"the reaction is thermodynamically favored with virtual complete conversion of reactants to products",
"an extremely fast chemical reaction",
"a reaction with a very large increase in entropy",
"none of the above"
] | D |
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