Pre AP Chemistry -1.3C Quantitative Gas Relationships- MCQ Exam Style Questions -New Syllabus 2025-2026
Pre AP Chemistry -1.3C Quantitative Gas Relationships- MCQ Exam Style Questions – New Syllabus 2025-2026
Pre AP Chemistry -1.3C Quantitative Gas Relationships- MCQ Exam Style Questions – Pre AP Chemistry – per latest Pre AP Chemistry Syllabus.
Question
In the ideal gas equation, pV = nRT, what are the units of n and T?
Answer/Explanation
Answer: D
Question
The general gas equation can be used to calculate the Mr value of a gas.
For a sample of a gas of mass mg, which expression will give the value of \(M_r\)?
Answer/Explanation
Ans: B
Questions
Which graph shows how the volume of a fixed mass of gas at constant temperature varies with its pressure?
▶️Answer/Explanation
Ans D
Questions
Which graph shows the relationship between the pressure and volume of a fixed mass of gas at constant temperature?
▶️Answer/Explanation
Ans D
Question
A substance loses thermal energy (heat) to the surroundings at a steady rate.
The graph shows how the temperature of the substance changes with time.
What could the portion PQ of the graph represent?
A. gas condensing
B. gas cooling
C. liquid cooling
D. liquid solidifying
Answer/Explanation
Ans: C
Question
Air in a sealed syringe is slowly compressed by moving the piston. The temperature of the air
stays the same.
Which statement about the air is correct?
A The pressure of the air decreases because its molecules now travel more slowly.
B The pressure of the air decreases because the area of the syringe walls is now smaller.
C The pressure of the air increases because its molecules now hit the syringe walls more frequently.
D The pressure of the air increases because its molecules now travel more quickly.
Answer/Explanation
Ans: C
Question
A gas storage tank has a fixed volume. The graph shows how the temperature of the gas in the
tank varies with time.
At time Y, the gas molecules are
A. closer together than at time X.
B. hitting the sides of the tank harder than at time X.
C. larger in size than at time X.
D. moving more slowly than at time X.
Answer/Explanation
Ans: B
Question
The pressure of a fixed mass of gas in a cylinder is measured. The temperature of the gas in the
cylinder is then slowly increased. The volume of the cylinder does not change.
Which graph shows the pressure of the gas during this process?
Answer/Explanation
Ans: C
Question
Some gas is trapped in a container of fixed volume. The temperature of the gas increases.
Which graph shows how the pressure of the gas changes with temperature?
Answer/Explanation
Ans: D
Question
What is the relationship between temperatures in kelvin (T) and temperatures in degrees Celsius \(\Theta\)?
A \(\Theta\) = T + 273
B \(\Theta\) = T – 273
C \(\Theta\) = T + 373
D \(\Theta\) = T – 373
▶️Answer/Explanation
Ans B
Question
Which row describes how the volume and mass of liquid mercury change as it is heated?
▶️Answer/Explanation
Ans D