General Chemistry Semi-Final Exam

A student observes the release of gas during a reaction between sodium bicarbonate and vinegar. Which gas is typically released during this reaction?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

A student is studying gas behavior in a classroom experiment. Which postulate of the kinetic molecular theory states that gas particles are in constant, random motion?

• Gas particles have negligible volume.

• Gas particles are in constant, random motion.

• Gas particles exert attractive forces on each other

• Gas particles move slower as the temperature decreases.

During an experiment, a balloon is filled with a gas produced from the reaction of magnesium and hydrochloric acid. What gas is most likely to fill the balloon in this reaction?

• Oxygen

• Nitrogen

• Hydrogen

• Carbon dioxide

According to the kinetic molecular theory, what happens to gas particles as temperature increases?

• Gas particles slow down.

• Gas particles collide less often.

• Gas particles move faster.

• Gas particles decrease in size.

A teacher is explaining how gases behave in chemical reactions, and mentions that gases expand to fill their container. Which characteristic of gases explains why they expand to fill any container?

• Gases have high density

• Gases have a fixed volume

• Gases do not have a fixed shape

• Gases are solid at room temperature

A gas sample is compressed into a smaller container. Which postulate of the kinetic molecular theory explains why gases can be compressed?

• Gas particles exert attractive forces.

• Gas particles have negligible volume.

• Gas particles move in straight lines.

• Gas particles decrease in mass when compressed

Which of the following is directly proportional to the volume of a gas at constant pressure?

• Temperature

• Mass

• Density

• Color

A student measures the pressure of a gas sample in a closed container and notices it remains constant. What does the kinetic molecular theory state about the forces between gas particles?

• Gas particles attract each other strongly.

• Gas particles lose energy during collisions.

• Gas particles increase in volume under pressure.

• Gas particles exert no significant attractive or repulsive forces on each other.

In a chemical reaction between zinc and hydrochloric acid, a gas is produced. What physical property of gas can be observed to determine its presence in the reaction?

• Color

• Temperature

• Bubbles

• Weight

During an experiment, a student notices that gas particles collide with the walls of the container. According to the kinetic molecular theory, what causes gas pressure in a container?

• The volume of the gas particles

• The number of particles in the gas.

• The attractive forces between gas particles.

• The collisions of gas particles with the container.