Pre AP Chemistry -1.3B Macroscopic Gas Properties and Kinetic Molecular Theory- MCQ Exam Style Questions -New Syllabus 2025-2026
Pre AP Chemistry -1.3B Macroscopic Gas Properties and Kinetic Molecular Theory- MCQ Exam Style Questions – New Syllabus 2025-2026
Pre AP Chemistry -1.3B Macroscopic Gas Properties and Kinetic Molecular Theory- MCQ Exam Style Questions – Pre AP Chemistry – per latest Pre AP Chemistry Syllabus.
Question
The diagram shows a quantity of gas trapped in a cylinder. The piston is pushed in slowly and the
gas is compressed. The temperature of the gas does not change.
Which graph shows the relationship between the pressure and the volume of the gas?
Answer/Explanation
Ans: B
Question
A container is partially filled with hot water, sealed and left to cool.
Which statements are correct?
1 As the temperature decreases, water molecules lose kinetic energy.
2 As the temperature decreases, more water molecules move from vapour to liquid.
3 As the temperature decreases, the vapour pressure of the water decreases.
The responses A to D should be selected on the basis of
Answer/Explanation
Answer:
A
Question
What are basic assumptions of the kinetic theory as applied to an ideal gas?
1 Gas particles are in continuous random motion.
2 Gas particles experience no intermolecular forces.
3 The volume of each gas particle is zero.
Answer/Explanation
Answer: A
Question
When molecules of a gas rebound from a wall of a container, the wall experiences a pressure.
What is the cause of this pressure?
A. the change in energy of the molecules
B. the change in momentum of the molecules
C. the change in power of the molecules
D. the change in speed of the molecules
Answer/Explanation
Ans: B
Question
Which statement about the evaporation of a liquid is correct?
A The least energetic molecules escape from the surface and the temperature of the liquid decreases.
B The least energetic molecules escape from the surface and the temperature of the liquid increases.
C The most energetic molecules escape from the surface and the temperature of the liquid decreases.
D The most energetic molecules escape from the surface and the temperature of the liquid increases.
Answer/Explanation
Ans:C
Question
During evaporation, molecules escape rapidly from the surface of a liquid.
What happens to the average energy of the molecules of the remaining liquid and what happens
to the temperature of the remaining liquid?
| average energy of remaining molecules | temperature of remaining liquid |
A | decreases | decreases |
B | decreases | increases |
C | stays the same | decreases |
D | stays the same | increases |
Answer/Explanation
Ans: A
Question
A swimmer feels cold after leaving warm water on a warm, windy day.
Why does she feel cold even though the air is warm?
A. The less energetic water molecules on her skin escape quickly.
B. The more energetic water molecules on her skin do not escape quickly.
C. The water on her skin does not evaporate quickly enough to keep her warm.
D. The water on her skin evaporates quickly and cools her skin.
Answer/Explanation
Ans: D
Question
A fixed mass of gas is trapped in a cylinder with a piston. The volume of the gas is slowly reduced at constant temperature without any particles of gas escaping.
Which statement is correct?
A) The force exerted by the gas on the piston will decrease because the particles move more quickly.
B) The force exerted by the gas on the piston will decrease because the particles move more slowly.
C) The force exerted by the gas on the piston will increase because the particles are hitting the piston harder.
D) The force exerted by the gas on the piston will increase because the particles are hitting the piston more frequently.
▶️Answer/Explanation
Ans: D
Question
What increases when the temperature of a copper block increases?
A the number of copper atoms in the block
B the melting point of the block
C the internal energy of the block
D the density of the block
▶️Answer/Explanation
Ans C
Question
The diagram represents gas particles moving around in a sealed container.
The gas particles collide with the walls of the container.
The temperature of the gas is increased.
What happens to the average speed of the gas particles and what happens to the number of
collisions by the gas particles with the walls of the container?
▶️Answer/Explanation
Ans: B
Question
In the diagrams, the black circle represents a smoke particle in air.
Which diagram shows a likely path that the particle takes because of Brownian motion?
Answer/Explanation
Ans:C
Question
Diagram 1 shows apparatus being used to observe smoke particles.
Diagram 2 shows how a smoke particle moves randomly.
Why do the smoke particles move randomly?
A They are hit by air molecules.
B They are less dense than air.
C They are moved by convection currents.
D They gain energy from the light.
Answer/Explanation
Ans:A