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University of Eldoret *
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6500
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Law
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Nov 24, 2024
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65. Which gas law describes the relationship between the temperature and pressure of a gas when volume is constant? 66. 67. 68. 69. 70. 7 — a. Gay-Lussac’s law ¢ Dalton’s law b. Charles’ law d. Boyle’s law ANS: A Gay-Lussac expressed the relationship between pressure and temperature. PTS: 1 REF: Page 35 The direct relationship between the volume and temperature of a gas is the basic principle of law. a. Gay-Lussac’s ¢ Dalton’s b. Charles’ d. Boyle's ANS: B Charles’ law is stated as follows: when the pressure of a gas is held constant, the volume of a gas varies directly with its absolute temperature, which is expressed in Kelvin. PTS: 1 REF: Page 36 It is implied that the absolute temperature of a gas will rise as the pressure is increased when which of the following occurs? a. Absolute temperature of the gas reaches absolute zero b. Size of the container remains constant c. Volume of the gas is held constant d. Volume of the gas is increased ANS: C When the volume of a gas is constant, the temperature of the gas will rise as the pressure is increased (Gay-Lussac’s law). Absolute zero is a theoretical temperature that has never been reached. The size of the container does not vary directly with volume. PTS: 1 REF: Page 36 The combined-gas law best describes which of the following? a. The behavior of all gases when volume is constant b. The combined behavior of pressure, volume, and temperature c. The additive properties of individual gases occupying the same space d. The macroscopic behavior of gases when any or all variables change simultaneously ANS: D The combined-gas law describes the macroscopic behavior of gases when any or all of the variables change simultaneously. As such, the combined-gas law states that the absolute pressure of a gasis inversely related to the volume it occupies and directly related to its absolute temperature, or PV/T = nR. PTS: 1 REF: Page 37 Which is the correct formula for the principles of the combined-gas law? a. PyV/T,=PVofT2 c. PyViT2= PV, b. PVT =nR d. TAP\Vi=TyP:V:2 ANS: A That is the formula for the combined-gas law. PTS: 1 REF: Page 38 In the combined-gas law, n represents: a. Boltzmann’s universal gas constant. ¢ the number of moles of gas. b. the atomic mass of the gas. d. the partial pressure of a gas. ANS: C Boltzmann’s constant is represented as R. The combined-gas laws do not use the atomic mass or the partial pressure of any gas as a variable in any calculations presented in answers B and D. PTS: 1 REF: Page 38 The sum of the partial pressures of a gas mixture equals the total gas pressure of the system. This statement represents which of the following laws? a. Dalton’s law b. Avogadro’s law c. The combined-gas law d. Boltzmann’s Universal Gas Constant ANS: A The correct answer is Dalton’s law. This law states that the total pressure of a gas is equal to the sum of the partial pressure of the gases that make up the mixture. The par-tial pressure of a gas within a gas mixture can be calculated by multiplying the total pressure of the mixture by the percentage of the mixture it occupies. PTS: 1 REF: Page 39 @ O 2
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