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9. 5 • the kinetic - molecular theory 457 figure 9. 34 molecular speed is directly related to molecular mass. at a given temperature, lighter molecules move faster on average than heavier molecules. link to learning the gas simulator ( http : / / openstax. org / l / 16molecvelocity ) may be used to examine the effect o... | openstax_chemistry2e-web | [
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9. 6 non - ideal gas behavior learning objectives by the end of this section, you will be able to : • describe the physical factors that lead to deviations from ideal gas behavior • explain how these factors are represented in the van der waals equation • define compressibility ( z ) and describe how its variation with... | openstax_chemistry2e-web | [
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relatively high pressures. to determine why this is, consider the differences between real gas properties and what is expected of a hypothetical ideal gas. particles of a hypothetical ideal gas have no significant volume and do not attract or repel each other. in general, real gases approximate this behavior at relativ... | openstax_chemistry2e-web | [
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9. 6 • non - ideal gas behavior 459 figure 9. 36 ( a ) attractions between gas molecules serve to decrease the gas volume at constant pressure compared to an ideal gas whose molecules experience no attractive forces. ( b ) these attractive forces will decrease the force of collisions between the molecules and container... | openstax_chemistry2e-web | [
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0. 1383 table 9. 3 460 9 • gases access for free at openstax. org at low pressures, the correction for intermolecular attraction, a, is more important than the one for molecular volume, b. at high pressures and small volumes, the correction for the volume of the molecules becomes important because the molecules themsel... | openstax_chemistry2e-web | [
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( b ) from the van der waals equation : this finally yields p = 32. 4 atm. ( c ) this is not very different from the value from the ideal gas law because the pressure is not very high and the temperature is not very low. the value is somewhat different because co2 molecules do have some volume and attractions between m... | openstax_chemistry2e-web | [
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9. 6 • non - ideal gas behavior 461 key terms absolute zero temperature at which the volume of a gas would be zero according to charles ’ s law. amontons ’ s law ( also, gay - lussac ’ s law ) pressure of a given number of moles of gas is directly proportional to its kelvin temperature when the volume is held constant ... | openstax_chemistry2e-web | [
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8. 314 l kpa mol – 1 k – 1 ideal gas law relation between the pressure, volume, amount, and temperature of a gas under conditions derived by combination of the simple gas laws kinetic molecular theory theory based on simple principles and assumptions that effectively explains ideal gas behavior manometer device used to... | openstax_chemistry2e-web | [
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unit of pascal or kilopascal, as well as in many other units including torr, atmosphere, and bar. atmospheric pressure is measured using a barometer ; other gas pressures can be measured using one of several types of manometers. | openstax_chemistry2e-web | [
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9. 2 relating pressure, volume, amount, and temperature : the ideal gas law the behavior of gases can be described by several laws based on experimental observations of their properties. the pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change ... | openstax_chemistry2e-web | [
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species pass from a container to a vacuum through very small orifices. the rates of effusion of gases are inversely proportional to the square roots of their densities or to the square roots of their atoms / molecules ’ masses ( graham ’ s law ). 9. 5 the kinetic - molecular theory the kinetic molecular theory is a sim... | openstax_chemistry2e-web | [
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9. 1 gas pressure 1. why are sharp knives more effective than dull knives? ( hint : think about the definition of pressure. ) 2. why do some small bridges have weight limits that depend on how many wheels or axles the crossing vehicle has? 3. why should you roll or belly - crawl rather than walk across a thinly - froze... | openstax_chemistry2e-web | [
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6. 50 millibars ( 1 bar = 0. 987 atm ). what is that pressure in torr and kpa? 9. the pressure of the atmosphere on the surface of the planet venus is about 88. 8 atm. compare that pressure in psi to the normal pressure on earth at sea level in psi. 10. a medical laboratory catalog describes the pressure in a cylinder ... | openstax_chemistry2e-web | [
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open - end mercury manometer. assuming atmospheric pressure is 760. 0 mm hg, determine the pressure of the gas in : ( a ) mm hg ( b ) atm ( c ) kpa 9 • exercises 465 16. the pressure of a sample of gas is measured at sea level with an open - end mercury manometer. assuming atmospheric pressure is 760 mm hg, determine t... | openstax_chemistry2e-web | [
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9. 2 relating pressure, volume, amount, and temperature : the ideal gas law 18. sometimes leaving a bicycle in the sun on a hot day will cause a blowout. why? 19. explain how the volume of the bubbles exhausted by a scuba diver ( figure 9. 16 ) change as they rise to the surface, assuming that they remain intact. 20. o... | openstax_chemistry2e-web | [
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a pressure of 1344 torr at 23 °c. if the can is thrown into a fire ( t = 475 °c ), what will be the pressure in the hot can? 28. what is the temperature of an 11. 2 - l sample of carbon monoxide, co, at 744 torr if it occupies 13. 3 l at 55 °c and 744 torr? 29. a 2. 50 - l volume of hydrogen measured at – 196 °c is war... | openstax_chemistry2e-web | [
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) 0. 100 l of co2 at 307 torr and 26 °c ( b ) 8. 75 l of c2h4, at 378. 3 kpa and 483 k ( c ) 221 ml of ar at 0. 23 torr and – 54 °c 36. a high altitude balloon is filled with 1. 41 104 l of hydrogen at a temperature of 21 °c and a pressure of 745 torr. what is the volume of the balloon at a height of 20 km, where the t... | openstax_chemistry2e-web | [
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) the variation of p with v ( b ) the variation of v with t ( c ) the variation of p with t ( d ) the variation of with v 42. a liter of methane gas, ch4, at stp contains more atoms of hydrogen than does a liter of pure hydrogen gas, h2, at stp. using avogadro ’ s law as a starting point, explain why. 43. the effect of... | openstax_chemistry2e-web | [
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##hiometry of gaseous substances, mixtures, and reactions 48. what is the density of laughing gas, dinitrogen monoxide, n2o, at a temperature of 325 k and a pressure of 113. 0 kpa? 49. calculate the density of freon 12, cf2cl2, at 30. 0 °c and 0. 954 atm. 50. which is denser at the same temperature and pressure, dry ai... | openstax_chemistry2e-web | [
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10. 0 atm. if the temperature of the cylinder is 28. 0 °c, what mass of oxygen is in the cylinder? 52. what is the molar mass of a gas if 0. 0494 g of the gas occupies a volume of 0. 100 l at a temperature 26 °c and a pressure of 307 torr? 53. what is the molar mass of a gas if 0. 281 g of the gas occupies a volume of ... | openstax_chemistry2e-web | [
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sample of gas isolated from unrefined petroleum contains 90. 0 % ch4, 8. 9 % c2h6, and 1. 1 % c3h8 at a total pressure of 307. 2 kpa. what is the partial pressure of each component of this gas? ( the percentages given indicate the percent of the total pressure that is due to each component. ) 60. a mixture of 0. 200 g ... | openstax_chemistry2e-web | [
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3. 0 % o2 is not. if enough o2 is added to a cylinder of h2 at 33. 2 atm to bring the total pressure to 34. 5 atm, is the mixture explosive? 62. a commercial mercury vapor analyzer can detect, in air, concentrations of gaseous hg atoms ( which are poisonous ) as low as 2 10−6 mg / l of air. at this concentration, what ... | openstax_chemistry2e-web | [
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##luorocarbon ccl2f2 can be recycled into a different compound by reaction with hydrogen to produce ch2f2 ( g ), a compound useful in chemical manufacturing : ( a ) outline the steps necessary to answer the following question : what volume of hydrogen at 225 atm and | openstax_chemistry2e-web | [
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35. 5 °c would be required to react with 1 ton ( 1. 000 103 kg ) of ccl2f2? ( b ) answer the question. 68. automobile air bags are inflated with nitrogen gas, which is formed by the decomposition of solid sodium azide ( nan3 ). the other product is sodium metal. calculate the volume of nitrogen gas at 27 °c and 756 tor... | openstax_chemistry2e-web | [
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12. 2 °c is formed by the reaction of 15. 48 g of cac2 with water? ( b ) answer the question. 71. calculate the volume of oxygen required to burn 12. 00 l of ethane gas, c2h6, to produce carbon dioxide and water, if the volumes of c2h6 and o2 are measured under the same conditions of temperature and pressure. 72. what ... | openstax_chemistry2e-web | [
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%? 78. one molecule of hemoglobin will combine with four molecules of oxygen. if 1. 0 g of hemoglobin combines with 1. 53 ml of oxygen at body temperature ( 37 °c ) and a pressure of 743 torr, what is the molar mass of hemoglobin? 79. a sample of a compound of xenon and fluorine was confined in a bulb with a pressure o... | openstax_chemistry2e-web | [
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9. 4 effusion and diffusion of gases 81. a balloon filled with helium gas takes 6 hours to deflate to 50 % of its original volume. how long will it take for an identical balloon filled with the same volume of hydrogen gas ( instead of helium ) to decrease its volume by 50 %? 82. explain why the numbers of molecules are... | openstax_chemistry2e-web | [
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18. 998403 = 352. 041206 g / mol. 87. calculate the relative rate of diffusion of 1h2 ( molar mass 2. 0 g / mol ) compared with 2h2 ( molar mass 4. 0 g / mol ) and the relative rate of diffusion of o2 ( molar mass 32 g / mol ) compared with o3 ( molar mass 48 g / mol ). 88. a gas of unknown identity diffuses at a rate ... | openstax_chemistry2e-web | [
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9. 5 the kinetic - molecular theory 90. using the postulates of the kinetic molecular theory, explain why a gas uniformly fills a container of any shape. 91. can the speed of a given molecule in a gas double at constant temperature? explain your answer. 92. describe what happens to the average kinetic energy of ideal g... | openstax_chemistry2e-web | [
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at the opening of this chapter greater than, less than, or equal to that of the atmosphere outside the balloon? ( b ) is the density of the gas in the hot - air balloon shown at the opening of this chapter greater than, less than, or equal to that of the atmosphere outside the balloon? ( c ) at a pressure of 1 atm and ... | openstax_chemistry2e-web | [
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°c and 100 °c. 9 • exercises 471 | openstax_chemistry2e-web | [
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9. 6 non - ideal gas behavior 99. graphs showing the behavior of several different gases follow. which of these gases exhibit behavior significantly different from that expected for ideal gases? 472 9 • exercises access for free at openstax. org 100. explain why the plot of pv for co2 differs from that of an ideal gas.... | openstax_chemistry2e-web | [
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under what temperature conditions would you expect z to have the largest deviations from the z for an ideal gas? 9 • exercises 473 474 9 • exercises access for free at openstax. org introduction chapter 10 liquids and solids 10. 1 intermolecular forces 10. 2 properties of liquids 10. 3 phase transitions 10. 4 phase dia... | openstax_chemistry2e-web | [
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10. 6 lattice structures in crystalline solids leprosy has been a devastating disease throughout much of human history. aside from the symptoms and complications of the illness, its social stigma led sufferers to be cast out of communities and isolated in colonies ; in some regions this practice lasted well into the tw... | openstax_chemistry2e-web | [
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10. 1 intermolecular forces learning objectives by the end of this section, you will be able to : • describe the types of intermolecular forces possible between atoms or molecules in condensed phases ( dispersion forces, dipole - dipole attractions, and hydrogen bonding ) • identify the types of intermolecular forces e... | openstax_chemistry2e-web | [
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a substance due to electrostatic phenomena, as will be detailed in this module. these forces serve to hold particles close together, whereas the particles ’ ke provides the energy required to overcome the attractive forces and thus increase the distance between particles. figure 10. 2 illustrates how changes in physica... | openstax_chemistry2e-web | [
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inside the lighter ’ s fuel compartment, the butane is compressed to a pressure that results in its condensation to the liquid state, as shown in figure 10. 4. figure 10. 4 gaseous butane is compressed within the storage compartment of a disposable lighter, resulting in its condensation to the liquid state. ( credit : ... | openstax_chemistry2e-web | [
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10. 1 • intermolecular forces 477 forces between molecules under appropriate conditions, the attractions between all gas molecules will cause them to form liquids or solids. this is due to intermolecular forces, not intramolecular forces. intramolecular forces are those within the molecule that keep the molecule togeth... | openstax_chemistry2e-web | [
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’ s location is subject to quantum - mechanical variability ), at any moment in time, an atom or molecule can develop a temporary, instantaneous dipole if its electrons are distributed asymmetrically. the presence of this dipole can, in turn, distort the electrons of a neighboring atom or molecule, producing an induced... | openstax_chemistry2e-web | [
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boiling points with increasing atomic / molecular size may be rationalized by considering how the strength of dispersion forces is affected by the electronic structure of the atoms or molecules in the substance. in a larger atom, the valence electrons are, on average, farther from the nuclei than in a smaller atom. thu... | openstax_chemistry2e-web | [
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##h4 < snh4. a graph of the actual boiling points of these compounds versus the period of the group 14 element shows this prediction to be correct : | openstax_chemistry2e-web | [
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10. 1 • intermolecular forces 479 check your learning order the following hydrocarbons from lowest to highest boiling point : c2h6, c3h8, and c4h10. answer : c2h6 < c3h8 < c4h10. all of these compounds are nonpolar and only have london dispersion forces : the larger the molecule, the larger the dispersion forces and th... | openstax_chemistry2e-web | [
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. 7 the strength of the dispersion forces increases with the contact area between molecules, as demonstrated by the boiling points of these pentane isomers. chemistry in everyday life geckos and intermolecular forces geckos have an amazing ability to adhere to most surfaces. they can quickly run up smooth walls and acr... | openstax_chemistry2e-web | [
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##ey and congcong hu at oregon state university described how geckos can achieve this by changing the angle between their spatulae and the surface. geckos ’ feet, which are normally nonsticky, become sticky when a small shear force is applied. by curling and uncurling their toes, geckos can alternate between sticking a... | openstax_chemistry2e-web | [
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10. 1 • intermolecular forces 481 link to learning watch this video ( http : / / openstax. org / l / 16kellaraut ) to learn more about kellar autumn ’ s research that determined that van der waals forces are responsible for a gecko ’ s ability to cling and climb. dipole - dipole attractions recall from the chapter on c... | openstax_chemistry2e-web | [
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at this temperature. the higher normal boiling point of hcl ( 188 k ) compared to f2 ( 85 k ) is a reflection of the greater strength of dipole - dipole attractions between hcl molecules, compared to the attractions between nonpolar f2 molecules. we will often use values such as boiling or freezing points, or enthalpie... | openstax_chemistry2e-web | [
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) and therefore experience similar london dispersion forces. icl is polar and thus also exhibits dipole - dipole attractions ; br2 is nonpolar and does not. the relatively stronger dipole - dipole attractions require more energy to overcome, so icl will have the higher boiling point. hydrogen bonding nitrosyl fluoride ... | openstax_chemistry2e-web | [
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hydrogen bonds are denoted by dots. figure 10. 10 illustrates hydrogen bonding between water molecules. figure 10. 10 water molecules participate in multiple hydrogen - bonding interactions with nearby water molecules. | openstax_chemistry2e-web | [
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10. 1 • intermolecular forces 483 despite use of the word “ bond, ” keep in mind that hydrogen bonds are intermolecular attractive forces, not intramolecular attractive forces ( covalent bonds ). hydrogen bonds are much weaker than covalent bonds, only about 5 to 10 % as strong, but are generally much stronger than oth... | openstax_chemistry2e-web | [
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shown in figure 10. 12. the stark contrast between our naive predictions and reality provides compelling evidence for the strength of hydrogen bonding. 484 10 • liquids and solids access for free at openstax. org figure 10. 12 in comparison to periods 3−5, the binary hydrides of period 2 elements in groups 17, 16 and 1... | openstax_chemistry2e-web | [
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78. 5 °c. check your learning ethane ( ch3ch3 ) has a melting point of −183 °c and a boiling point of −89 °c. predict the melting and boiling points for methylamine ( ch3nh2 ). explain your reasoning. answer : the melting point and boiling point for methylamine are predicted to be significantly greater than those of et... | openstax_chemistry2e-web | [
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10. 1 • intermolecular forces 485 how sciences interconnect hydrogen bonding and dna deoxyribonucleic acid ( dna ) is found in every living organism and contains the genetic information that determines the organism ’ s characteristics, provides the blueprint for making the proteins necessary for life, and serves as a t... | openstax_chemistry2e-web | [
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. ” the cumulative effect of millions of hydrogen bonds effectively holds the two strands of dna together. importantly, the two strands of dna can relatively easily “ unzip ” down the middle since hydrogen bonds are relatively weak compared to the covalent bonds that hold the atoms of the individual dna molecules toget... | openstax_chemistry2e-web | [
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10. 2 properties of liquids learning objectives by the end of this section, you will be able to : • distinguish between adhesive and cohesive forces • define viscosity, surface tension, and capillary rise • describe the roles of intermolecular attractive forces in each of these properties / phenomena when you pour a gl... | openstax_chemistry2e-web | [
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10. 2 • properties of liquids 487 figure 10. 15 ( a ) honey and ( b ) motor oil are examples of liquids with high viscosities ; they flow slowly. ( credit a : modification of work by scott bauer ; credit b : modification of work by david nagy ) the imfs between the molecules of a liquid, the size and shape of the molec... | openstax_chemistry2e-web | [
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16. 1 honey variable ~ 2, 000 – 10, 000 motor oil variable ~ 50 – 500 table 10. 2 the various imfs between identical molecules of a substance are examples of cohesive forces. the molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liq... | openstax_chemistry2e-web | [
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without breaking. a steel needle carefully placed on water will float. some insects, like the one shown in figure 10. 17, even though they are denser than water, move on its surface because they are supported by the surface tension. surface tensions of common substances at 25 °c substance formula surface tension ( mn /... | openstax_chemistry2e-web | [
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10. 2 • properties of liquids 489 studied on her own, began investigating the impact and characteristics of soapy and greasy films in water. using homemade materials, she developed an instrument known as a trough for measuring surface contaminants and their effects. with the support of renowned scientist lord rayleigh,... | openstax_chemistry2e-web | [
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forms a convex meniscus when confined in a tube because the cohesive forces within the mercury tend to draw it into a drop ( figure 10. 18 ). figure 10. 18 differences in the relative strengths of cohesive and adhesive forces result in different meniscus shapes for mercury ( left ) and water ( right ) in glass tubes. (... | openstax_chemistry2e-web | [
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drawn up the cellulose fibers. capillary action can also occur when one end of a small diameter tube is immersed in a liquid, as illustrated in figure 10. 20. if the liquid molecules are strongly attracted to the tube molecules, the liquid creeps up the inside of the tube until the weight of the liquid and the adhesive... | openstax_chemistry2e-web | [
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10. 2 • properties of liquids 491 following equation : in this equation, h is the height of the liquid inside the capillary tube relative to the surface of the liquid outside the tube, t is the surface tension of the liquid, θ is the contact angle between the liquid and the tube, r is the radius of the tube, ρ is the d... | openstax_chemistry2e-web | [
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biomedical applications of capillary action many medical tests require drawing a small amount of blood, for example to determine the amount of glucose in someone with diabetes or the hematocrit level in an athlete. this procedure can be easily done because of capillary action, the ability of a liquid to flow up a small... | openstax_chemistry2e-web | [
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10. 3 phase transitions learning objectives by the end of this section, you will be able to : • define phase transitions and phase transition temperatures • explain the relation between phase transition temperatures and intermolecular attractive forces • describe the processes represented by typical heating and cooling... | openstax_chemistry2e-web | [
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of the vessel have no effect on the vapor pressure, although they do affect the time required for the equilibrium to be reached. we can measure the vapor pressure of a liquid by placing a sample in a closed container, like that illustrated in figure 10. 22, and using a manometer to measure the increase in pressure that... | openstax_chemistry2e-web | [
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10. 3 • phase transitions 493 the liquid to become the gas ( b ) increases and eventually ( c ) equals the rate of gas molecules entering the liquid. when this equilibrium is reached, the vapor pressure of the gas is constant, although the vaporization and condensation processes continue. the chemical identities of the... | openstax_chemistry2e-web | [
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lower vapor pressure than for either diethyl ether or ethanol. ethylene glycol has two −oh groups, so, like water, it exhibits extensive hydrogen bonding. it is much larger than water and thus experiences larger london forces. its overall imfs are the largest of these four substances, which means its vaporization rate ... | openstax_chemistry2e-web | [
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0. 56 kpa answer : all these compounds exhibit hydrogen bonding ; these strong imfs are difficult for the molecules to overcome, so the vapor pressures are relatively low. as the size of molecule increases from methanol to butanol, dispersion forces increase, which means that the vapor pressures decrease as observed : ... | openstax_chemistry2e-web | [
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as depicting the dependence of a liquid ’ s boiling point on surrounding pressure. figure 10. 24 the boiling points of liquids are the temperatures at which their equilibrium vapor pressures equal the pressure of the surrounding atmosphere. normal boiling points are those corresponding to a pressure of 1 atm ( 101. 3 k... | openstax_chemistry2e-web | [
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10. 24 to determine the boiling point of water at this elevation. solution the graph of the vapor pressure of water versus temperature in figure 10. 24 indicates that the vapor pressure of water is 68 kpa at about 90 °c. thus, at about 90 °c, the vapor pressure of water will equal the atmospheric pressure in leadville,... | openstax_chemistry2e-web | [
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is 10. 0 kpa, and at 98. 8 °c, its vapor pressure is 100. 0 kpa. use this information to estimate the enthalpy of vaporization for isooctane. solution the enthalpy of vaporization, δhvap, can be determined by using the clausius - clapeyron equation : 496 10 • liquids and solids access for free at openstax. org since we... | openstax_chemistry2e-web | [
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372. 0 k, p2 = 100 kpa ), we can substitute them into this equation and solve for δhvap. rearranging the clausius - clapeyron equation and solving for δhvap yields : note that the pressure can be in any units, so long as they agree for both p values, but the temperature must be in kelvin for the clausius - clapeyron eq... | openstax_chemistry2e-web | [
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the clausius - clapeyron equation and then solve for t2. rearranging the clausius - clapeyron equation and solving for t2 yields : check your learning for acetone ( ch3 ) 2co, the normal boiling point is 56. 5 °c and the enthalpy of vaporization is 31. 3 kj / mol. what is the vapor pressure of acetone at 25. 0 °c? answ... | openstax_chemistry2e-web | [
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10. 3 • phase transitions 497 a shower. when the water on your skin evaporates, it removes heat from your skin and causes you to feel cold. the energy change associated with the vaporization process is the enthalpy of vaporization, δhvap. for example, the vaporization of water at standard temperature is represented by ... | openstax_chemistry2e-web | [
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atoms, molecules, or ions and the solid gets hotter. at some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state, or melting. at this point, the temperatur... | openstax_chemistry2e-web | [
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one term or the other is normally dictated by the direction of the phase transition being considered, for example, solid to liquid ( melting ) or liquid to solid ( freezing ). the enthalpy of fusion and the melting point of a crystalline solid depend on the strength of the attractive forces between the units present in... | openstax_chemistry2e-web | [
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10. 3 • phase transitions 499 figure 10. 27 sublimation of solid iodine in the bottom of the tube produces a purple gas that subsequently deposits as solid iodine on the colder part of the tube above. ( credit : modification of work by mark ott ) like vaporization, the process of sublimation requires an input of energy... | openstax_chemistry2e-web | [
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the chapter on thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its accompanying temperature change, δt, was introduced : where m is the mass of the substance and c is its specific heat. the relation applies to matter being heated or cooled, but not undergoing a chang... | openstax_chemistry2e-web | [
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10. 3 • phase transitions 501 figure 10. 29 a typical heating curve for a substance depicts changes in temperature that result as the substance absorbs increasing amounts of heat. plateaus in the curve ( regions of constant temperature ) are exhibited when the substance undergoes phase transitions. example 10. 10 total... | openstax_chemistry2e-web | [
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10. 4 phase diagrams learning objectives by the end of this section, you will be able to : • explain the construction and use of a typical phase diagram • use phase diagrams to identify stable phases at given temperatures and pressures, and to describe phase transitions resulting from changes in these properties • desc... | openstax_chemistry2e-web | [
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10. 4 • phase diagrams 503 figure 10. 30 the physical state of a substance and its phase - transition temperatures are represented graphically in a phase diagram. to illustrate the utility of these plots, consider the phase diagram for water shown in figure 10. 31. figure 10. 31 the pressure and temperature axes on thi... | openstax_chemistry2e-web | [
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that will be described in the next section of this module. the solid - vapor curve, labeled ab in figure 10. 31, indicates the temperatures and pressures at which ice and water vapor are in equilibrium. these temperature - pressure data pairs correspond to the sublimation, or deposition, points for water. if we could z... | openstax_chemistry2e-web | [
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all three curves is labeled b in figure 10. 31. at the pressure and temperature represented by this point, all three phases of water coexist in equilibrium. this temperature - pressure data | openstax_chemistry2e-web | [
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10. 4 • phase diagrams 505 pair is called the triple point. at pressures lower than the triple point, water cannot exist as a liquid, regardless of the temperature. example 10. 11 determining the state of water using the phase diagram for water given in figure 10. 31, determine the state of water at the following tempe... | openstax_chemistry2e-web | [
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comparison to water. 506 10 • liquids and solids access for free at openstax. org figure 10. 34 a phase diagram for carbon dioxide is shown. the pressure axis is plotted on a logarithmic scale to accommodate the large range of values. example 10. 12 determining the state of carbon dioxide using the phase diagram for ca... | openstax_chemistry2e-web | [
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10. 4 • phase diagrams 507 observed. as we increase the temperature, the pressure of the water vapor increases, as described by the liquid - gas curve in the phase diagram for water ( figure 10. 31 ), and a two - phase equilibrium of liquid and gaseous phases remains. at a temperature of 374 °c, the vapor pressure has ... | openstax_chemistry2e-web | [
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374. 0 22, 000 figure 10. 35 ( a ) a sealed container of liquid carbon dioxide slightly below its critical point is heated, resulting in ( b ) the formation of the supercritical fluid phase. cooling the supercritical fluid lowers its temperature and pressure below the critical point, resulting in the reestablishment of... | openstax_chemistry2e-web | [
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, we can hear liquid co2 sloshing around inside the cylinder. however, the same cylinder appears to contain no liquid on a hot summer day ( 35 °c ). explain these observations. solution on the cool day, the temperature of the co2 is below the critical temperature of co2, 304 k or 31 °c, so liquid co2 is present in the ... | openstax_chemistry2e-web | [
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h2o, hot water decaffeination processes can also remove some of these compounds, adversely affecting the smell and taste of the decaffeinated coffee. dichloromethane ( ch2cl2 ) and ethyl acetate ( ch3co2c2h5 ) have similar polarity to caffeine, and are therefore very effective solvents for caffeine extraction, but both... | openstax_chemistry2e-web | [
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10. 5 the solid state of matter learning objectives by the end of this section, you will be able to : • define and describe the bonding and properties of ionic, molecular, metallic, and covalent network crystalline solids • describe the main types of crystalline solids : ionic solids, metallic solids, covalent network ... | openstax_chemistry2e-web | [
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silicon dioxide, sio2, is abundant in nature as one of several crystalline forms of the mineral quartz. ( b ) rapid cooling of molten sio2 yields an amorphous solid known as “ fused silica ”. crystalline solids are generally classified according to the nature of the forces that hold its particles together. these forces... | openstax_chemistry2e-web | [
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10. 5 • the solid state of matter 511 malleability ( the ability to deform under pressure or hammering ), they do not shatter and, therefore, make useful construction materials. the melting points of the metals vary widely. mercury is a liquid at room temperature, and the alkali metals melt below 200 °c. several post -... | openstax_chemistry2e-web | [
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crystals vary widely, as indicated by the melting points of the crystals. small symmetrical molecules ( nonpolar molecules ), such as h2, n2, o2, and f2, have weak attractive forces and form molecular solids with very low melting points ( below −200 °c ). substances consisting of larger, nonpolar molecules have larger ... | openstax_chemistry2e-web | [
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as a solid, high to very high melting points nacl, al2o3 metallic atoms of electropositive elements metallic bonds shiny, malleable, ductile, conducts heat and electricity well, variable hardness and melting temperature cu, fe, ti, pb, u covalent network atoms of electronegative elements covalent bonds very hard, not c... | openstax_chemistry2e-web | [
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10. 5 • the solid state of matter 513 how sciences interconnect graphene : material of the future carbon is an essential element in our world. the unique properties of carbon atoms allow the existence of carbon - based life forms such as ourselves. carbon forms a huge variety of substances that we use on a daily basis,... | openstax_chemistry2e-web | [
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solids access for free at openstax. org figure 10. 44 graphene sheets can be formed into buckyballs, nanotubes, and stacked layers. crystal defects in a crystalline solid, the atoms, ions, or molecules are arranged in a definite repeating pattern, but occasional defects may occur in the pattern. several types of defect... | openstax_chemistry2e-web | [
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10. 6 lattice structures in crystalline solids learning objectives by the end of this section, you will be able to : • describe the arrangement of atoms and ions in crystalline structures • compute ionic radii using unit cell dimensions • explain the use of x - ray diffraction measurements in determining crystalline st... | openstax_chemistry2e-web | [
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cell shows the locations of lattice points repeating in all directions. let us begin our investigation of crystal lattice structure and unit cells with the most straightforward structure and the most basic unit cell. to visualize this, imagine taking a large number of identical spheres, such as tennis balls, and arrang... | openstax_chemistry2e-web | [
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contact each other, so the edge length of this cell is equal to two atomic radii, or one atomic diameter. a cubic unit cell contains only the parts of these atoms that are within it. since an atom at a corner of a simple cubic unit cell is contained by a total of eight unit cells, only one - eighth of that atom is with... | openstax_chemistry2e-web | [
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