Download Santee Education Complex Chemistry Mini Assessment 4

Santee Education Complex Chemistry Mini Assessment 4-The Gas Laws
Please answer the following questions by choosing the most correct response (1 pt each).
1) Which gas is monoatomic at STP?
a. Chlorine
b. Fluorine
c. Neon
d. Nitrogen
2) What Kelvin temperature is equal to 25°C?
a. 248 K
b. 298 K
c. 100 K
d. 200 K
3) As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will
a. decrease.
b. increase.
c. remain the same.
d. not enough information.
4) As the pressure of a gas at 2 atm is changed to 1 atm at constant temperature, the volume of the gas
a. decreases.
b. increases.
c. remains the same.
d. depends on the gas.
5) Under the same conditions of temperature and pressure, a liquid differs from a gas because the particles of the liquid
a. are in constant straight line motion.
b. take the shape of the container they occupy.
c. have no regular arrangement.
d. have stronger forces of attraction between them.
6) The volume of a given mass of ideal gas at constant pressure is
a. directly proportional to the Kelvin temperature.
b. directly proportional to the Celsius temperature.
c. inversely proportional to the Kelvin temperature.
d. inversely proportional to the Celsius temperature.
7) A sample of unknown gas at STP has a density of 0.630 g per liter. What is the molecular mass of this gas?
a. 2.81 g
b. 14.1 g
c. 22.4 g
d. 63 g
8) Under which conditions are gases most soluble in water?
a. High pressure and high pressure
b. High pressure and low temperature
c. Low pressure and high temperature
d. Low pressure and low temperature
9) A student investigated the physical and chemical properties of a sample of unknown gas and then investigated the gas. Which
statement represents a conclusion rather than an experimental observation?
a. The gas is colorless
b. The gas is carbon dioxide
c. When the gas is bubbled in limewater, the liquid becomes cloudy
d. When placed in the gas, a flaming splint stops burning
10) What are standard temperature and pressure conditions for gases?
a. 0° C and 1 atm
b. 0 K and 760 torr
c. -273 °C and 1 atm
d. 0 °C and 760 torr
11) If the volume of a gas in a sealed chamber is doubled while temperature remains constant, what change would be observed?
a. It would be half as large.
b. It would double.
c. It would be four times as large.
d. It would be ¼ as large.
12) A given mass of gas in a rigid container is heated from 100 °C to 500 °C. Which best describes the pressure of the gas?
a. The pressure will decrease by a factor of five.
b. The pressure will increase by a factor of five.
c. The pressure will increase by a factor of about two.
d. The pressure will increase by a factor of about eight.
13) Which of the following has the most molecules based on the ideal gas law?
a. 1.00 L of CH4 at 0 °C and 1.00 atm
b. 1.00 L of N2 at 0 °C and 1.00 atm
c. 1.00 L of CH4 at 20 °C and 1.00 atm
d. 1.00 L of CO2 a 50 °C and 1.25 atm
14) Avogardo stated that equal volumes of gases under the same conditions of temperature and pressure have equal
a. numbers of molecules.
b. numbers of grams.
c. molar masses.
d. atoms.
15) Which of the following statements is true?
a. All particles moving with the same velocity have the same kinetic energy.
b. All particles at the same temperature have the same kinetic energy.
c. All particles having the same kinetic energy have the same mass.
d. As the kinetic energy of a particle is halved, its velocity is also halved.
16) If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change within the container?
a. The pressure will be 5 times as great.
b. The pressure will be 2 times as great.
c. The pressure will be 4 times as great.
d. The pressure will not change.
17) A 25 L tank of oxygen under a pressure of 8 atm would require what pressure to decrease the volume to 1.0 L?
a. 0.31 atm
b. 3.2 atm
c. 200 atm
d. There is not enough information.
18) A balloon containing 2.50 L of gas at 1 atm would be what volume at a pressure of 300 KPa?
a. 8.11 L
b. 0.844 L
c. 120 L
d. 0.000833 L
19) A syringe containing 75.0 mL of air is at 298 K. What will the volume be if it is placed in a boiling water bath at 373 K?
a. 59.9 mL
b. 188 mL
c. 300 mL
d. None of the above
20) Which of the following represents the ideal gas law?
a. P1V1=P2V2
b. V1/T1=V2/T2
c. P1/T1=P2T2
d. PV=nRT