A
True or False
Pressure decreases as the altitude increases
True
The values when gases at STP
0 degrees Celsius and 1 atm
A few places on Earth are below sea level (the Dead Sea, for example). What would be the average atmospheric pressure there?
greater than 1 atm
The number in a chemical equation that tells you the ratio of volumes if the reaction takes place at constant temperature and pressure
Coefficient
as volume increases, the number of collisions _______________, so pressure ________________.
decrease, decreases
The law that states the total pressure of a gas mixture is equal to the sum of the individual pressures of the gases in the mixture.
Dalton’s Law of Partial Pressure
Standard molar volume for a gas at STP
What is 22.4 L per mole
as the temperature of gas particles increase, the rate of effusion ____________.
Increases
When a gas is collected by water displacement, the total pressure is equal to ?
The partial pressure of that gas plus the partial pressure of water at that temperature
How many grams of gas are present in each of the following cases?
7.24 × 10–2 g CO2
one of the gas laws in which there is an inverse relationship. State the law and formula.
Boyle’s Law: P1V1=P2V2
True or False
At STP, three different gases occupy a volume of 22.4 L. The masses of the gases are also equal.
False
If two gases are at the same temperature, which gas will have a slower rate of effusion: carbon dioxide or nitrogen gas?
Carbon dioxide
What three things affects pressure?
Temperature, volume, and number of molecules
The law that states that gas pressure varies directly with temperature.
Gay-Lussac’s Law
State the combined gas law
PV/T= PV/T
The four factors that are included in the ideal gas law.
Temperature, volume, number of moles, and pressure
A weather balloon contains 8.80 moles of helium at a pressure of 0.992 atm and a temperature of 25.0 °C at ground level. What is the volume of the balloon under these conditions?
217 L
1 atm is equal to what amount of the other 3 units of pressure?
760 torr, 760 mm Hg, 101.325 kPa
What is the temperature in Kelvin of an 11.2-L sample of carbon monoxide, CO, at 744 torr if it occupies 13.3 L at 55.0 °C?
276 K
True or False
At the same temperature and pressure, equal volumes of gases will have unequal number molecules
False
The value and units of the gas constant.
R= .0821 (atm X L)/(Mol X K)
An unknown gas effuses 1.66 times more rapidly than CO2. What is the molar mass of the unknown gas?
16.0 g/mol