Chemistry Final: Gas Laws Test – Flashcards
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Which of the following is NOT one of the assumptions of kinetic theory?
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Only small attractive and repulsive forces exist between gas particles.
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Why does the pressure inside a container of gas increase if more gas is added to the container?
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Because there is a corresponding increase in the number of particles striking an area of the wall of the container per unit time.
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Why does air leave a tire when the tire valve is opened?
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Because the pressure outside the tire is lower than the pressure inside the tire.
*** Wants to create equilibrium
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Increasing the volume of a given amount of gas at constant temperature causes the pressure to decrease because
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The molecules are striking a larger area with the same force.
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What happens to the temperature of a gas when it is compressed?
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The temperature increases.
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What happens to the pressure of a gas inside a container if the temperature of the gas is lowered?
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The pressure decreases.
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If a balloon is squeezed, what happens to the air pressure within the balloon?
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It increases
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The volume of a gas is doubled while the temperature is held constant. How does the pressure change?
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It is reduced by one-half.
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A gas occupies a volume of .7L at 10.1 kPa. What volume will the gas occupy at 101 kPa.
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.07 L
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A sample of gas occupies 40 ML at -123 degrees C. What volume does the sample occupy at 27 degrees C.
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80 mL
*** 40 mL at 150 K
80 mL at 300 K
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Which of these changes would NOT cause an increase in the pressure of a gaseous system?
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The container is made larger.
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Why does an aerosol can become cooler when gas is released?
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Because the propellant expands
*** Lowers pressure
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When the temperature and number of particles are kept constant for a sample of gas, which of the following is also constant for the sample?
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The product of the pressure and volume.
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If a balloon is rubbed vigorously, what happens to the volume of the air in the balloon if the pressure is constant?
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It increases.
*** It increases the temperature
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Generally, for a gas at a constant volume
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The pressure of a gas is directly proportional to its temperature in kelvins.
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The combined gas law relates which of these?
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Temperature, volume and pressure.
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An ideal gas CANNOT be
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Liquefied/Condensed
*** Molecules are not attracted to each other
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Which of the following is constant for one mole of any ideal gas?
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PV/T
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What does the ideal gas law allow a scientist to calculate that the other laws do not?
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Number of moles.
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At a certain temperature and pressure, .20 mol of CO2 has a volume of 3.1L. A 3.1-L sample of hydrogen at the same temperature and pressure...
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Contains the same number of molecules.
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A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 101 kPa if PHe= 84 kPa and = .1 kPa.
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16.9 kPa
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The tendency of molecules to move toward areas of lower concentration is called...
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Diffusion
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Which of the following atoms would have the greatest velocity if each atoms had the same kinetic energy?
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Hydrogen
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The volume of a gas is reduced from 4 L to .5 L while the temperature is held constant. How does the gas pressure change?
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Increases by a factor of 8
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As the temperature of a fixed volume of a gas increases, the pressure will...
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Increase
