GENERAL CHEMISTRY 1

NAME (Family Name, First Name, M.I.)

1. Which of the following best defines pressure?

• The weight of an object.
• The rate of change of velocity.
• The force applied over a specific area.
• The amount of force needed to move an object.

2. Which equation represents Boyle's Law?

• P₁V₁ = P₂V₂
• P₁/T₁ = P₂/T₂
• V₁/P₁ = V₂/P₂
• V₁/T₁ = V₂/T₂

3. A gas sample has an initial volume of 2.5 L at a pressure of 1.0 atm. If the pressure is increased to 2.0 atm while the temperature remains constant, what is the final volume of the gas?

• 1.25 L
• 2.5 L
• 5.0 L
• 10.0 L

4. A sample of gas has a volume of 2.0 L at a temperature of 27 °C and a pressure of 1.0 atm. If the temperature is increased to 54 °C while the volume remains constant, what is the new pressure of the gas? (Assume the number of moles of gas remains constant.)

• 0.5 atm
• 1.09 atm
• 1.5 atm
• 2.0 atm

5. A sample of helium gas (He) occupies a volume of 2.5 L at a temperature of 27 °C and a pressure of 1.0 atm. How many moles of helium gas are present in the sample? (R = 0.0821 L·atm/mol·K)

• 0.10 mol
• 0.25 mol
• 0.50 mol
• 1.0 mol

6. A sample of gas has a pressure of 1.0 atm at a temperature of 20 °C. If the temperature is increased to 40°C while the volume remains constant, what is the new pressure of the gas?

• 0.5 atm
• 0.10 atm
• 1.07 atm
• 2.0 atm

7. A container holds a mixture of two gases: nitrogen (N2) and oxygen (O2). The partial pressure of nitrogen is 0.6 atm, and the partial pressure of oxygen is 0.4 atm. What is the total pressure of the gas mixture?

• 0.2 atm
• 1.0 atm
• 1.2 atm
• 2.4 atm

8. A container holds a mixture of helium (He) and argon (Ar). The partial pressure of helium is 0.8 atm. If the total pressure of the mixture is 1.2 atm, what is the partial pressure of argon?

• 0.2 atm
• 0.4 atm
• 1.0 atm
• 2.0 atm

9. A mixture of gases contains nitrogen (N₂) with a partial pressure of 0.3 atm and oxygen (O₂) with a partial pressure of 0.5 atm. What is the total pressure of the gas mixture?

• 0.2 atm
• 0.8 atm
• 1.5 atm
• 1.8 atm