South Pasadena • Chemistry Name
Period Date
11 · Properties of Gases
STATION 1 • TEMPERATURE
Standard Temperature is: °C or K
Convert:
26.0 °C = ______K 400 K = ______°C
100 K = ______°C 135 °C = ______K
-127 °C = ______K 4 K = ______°C
What is the temperature of a sample of gas that has double the kinetic energy (motion energy) of a sample of gas at 80°C?
In Kinetic Molecular Theory, the temperature is the:
11 · Properties of Gases
STATION 2 • PRESSURE UNITS
Standard Pressure is:
atm = mmHg = torr = 14.7 psi = 101.3 kPa
Make the following conversions: (Show your work)
550 mmHg = ? kPa 55 psi = ? mmHg
325 kPa = ? atm 2284 torr = ? kPa
48.0 mmHg = ? torr 1.85 atm = ? mmHg
In Kinetic Molecular Theory, the pressure describes:
11 · Properties of Gases
STATION 3 • GAS LAW PROBLEMS
Label the variables in each problem and decide which law applies (Boyle, Charles, Combined, Ideal, etc.). Solve the problem.
______1. A balloon has a volume of 5.00 L at 2.50 atm. What is the balloon’s volume at 1.50 atm?
______2. A balloon has a volume of 3.50 L at 21.0°C when the air pressure is 1.05 atm. How many moles of gas are contained in the balloon?
11 · Properties of Gases
STATION 4 • MORE GAS LAW PROBLEMS
Label the variables in each problem and decide which law applies (Boyle, Charles, Combined, Ideal, etc.). Solve the problem.
______1. A balloon at 35°C has a volume of 2.5 L. What is its volume at 45°C?
______2. A balloon has a volume of 1.0 L at 21.0°C and 750 mmHg. What is the balloon’s volume at STP?
11 · Properties of Gases
STATION 5 • KINETIC MOLECULAR THEORY
Explain the following observations in terms of the “kinetic molecular theory” (that is, what do the gas particles look like?)
A balloon of gas is placed in a car on a hot day. The balloon gets larger. Explain.
The particles are moving ______and collide with the walls of the balloon ______and ______.The gas particles inside the balloon push ______than the air particles outside of the balloon.
A syringe is squeezed so the gas sample changes from 10 cc to 5 cc. The pressure doubles.
When the gas is squeezed, the distance particles must travel between collisions with the container wall is ______so the number of collisions ______.11 · Properties of Gases
STATION 6 • IDEAL GAS LAW
A 10.0 gram chunk of dry ice (solid CO2) changes to gas.
What is the volume of that gas measured at 27°C and 740 mmHg?
What is the density of the gas?
11 · Properties of Gases
STATION 7 • IDEAL GAS LAW
Calculate the moles of a gas sample if 3.0 grams of the gas in a 2.0 L container at 25°C has a pressure of 2.294 atm.
Calculate the molar mass of the gas.
11 · Properties of Gases
STATION 8 • HYDROGEN LAB
Information:
length of Mg used: 4.65 cm mass of 1.00 m of Mg: 0.958 g Molar Mass of Mg = 24.31 g/mol
pressure of the room: 753.6 mmHg room temperature: 21.0 °C
vapor pressure at 21.0°C: 18.6 mmHg.
Complete and balance this chemical equation:
__Mg + __HCl ®
How many moles of hydrogen gas are generated from this piece of magnesium ribbon? Show work.
What is the volume of hydrogen gas collected at these conditions?
11 · Properties of Gases
STATION 9 • GRAPHS OF VARIABLES
Sketch the graph of the following pairs of variables:
Circle the “Law” that would relate each pair of variables:
P·V = constant= constant / P·T = constant
= constant / V·T = constant
= constant / P·n = constant
= constant