QUARTER 4 PRACTICE TEST

Which is an assumption of the Kinetic Molecular Theory (KMT) of gases?

• Gases consist of closely spaced particles.

• Collisions between gas particles are inelastic.

• Gas particles move around in an orderly manner.

• The temperature of a gas depends on the average kinetic energy of the gas particles.

Based on the illustration of KMT, which BEST describes the motion of gas particles?

• Gas particles _____.

• only move when temperature is increased

• move in circular paths around a central point

• stay in place unless acted upon by an external force

• move randomly in straight-line motion until they collide

What assumption of the kinetic molecular theory of gases explain that gas molecules after colliding with one another simply bounce off in different directions?

• Gases undergo elastic collisions.

• Gases are made up of tiny particles.

• Gas molecules show no attraction to one another.

• Gas molecules move randomly in different directions.

When a hot balloon is heated, the temperature of the air inside increases, and the average kinetic energy of the particles in the air also increase. This creates the "lift" needed to take the balloon into the air. How does the Kinetic-Molecular Theory explain this?

• The balloon expands due to gravitational force.

• The heat creates more gas molecules inside the balloon.

• The air molecules become heavier and push the balloon up.

• Heating increases the speed of gas molecules, making the air inside the balloon less dense.

Ben sprays perfume one one side of the room, and after a short time, his friend on the other side smells it. Which KMT principle explains this?

• Air molecules push the perfume in one direction.

• The perfume molecules are carried by sound waves.

• Gas particles move in random motion and spread out.

• Perfume molecules become heavier and fall to the ground.

Study the data below, what relationship between pressure and volume of confined air can be drawn from the data?

• Stays the same

• Rises and then falls

• Directly proportional

• Inversely proportional

Karen decides to go SCUBA diving while on vacation in Boracay. As she swims deeper into the sea, the pressure pushing on her increases. As the diver goes deeper, what happens to the volume of the air in her lungs? The volume __________________because the pressure ______________.

• increases; increases

• decreases; increases

• increases; decreases

• remains the same; is constant

A sealed syringe is filled with a fixed amount of air. When the plunger is pushed in, what happens to the pressure and volume of the air inside?

• Both volume and pressure increase.

• Both volume and pressure decrease.

• The volume increases, and the pressure decreases.

• The volume decreases, and the pressure increases.

A gas has a volume of 4 liters at a pressure of 2 atm. The volume is changed to 16 liters. What must be the new pressure?

• 0.5 atm

• 2 atm

• 10 atm

• 12 atm

The pressure on a sample of gas has increased from 1.0 atm. To 3.0 atm. If the new volume is 0.52 L, find the original volume.

• 0.52 L

• 0.173 L

• 1.00 L

• 1.56 L