6.2 Thermal Energy Lessons 4 & 5 Assessment

What is one reason a cup with a lid cools down slower than a cup without a lid?

• The lid blocks all heat.
• The lid allows more air in.
• The lid slows down the loss of heat and matter.
• The lid makes the cup heavier.

Why is measuring mass important in experiments involving matter loss?

• It confirms the experiment is successful.
• It helps to show how much matter left the system.
• It is not important; only temperature matters.
• It adds complexity to the experiment.

Which of the following is an example of condensation?

• Ice melting in the sun.
• Steam rising from a hot soup.
• Water droplets on a cold soda can.
• Rain falling from clouds.

What is evaporation?

• When a solid turns into a gas
• When a liquid turns into a gas
• When a gas turns into a solid
• When a gas becomes a liquid

Why do we see water droplets on car windows during cold weather?

• The windows are dirty.
• The warm air inside the car touches the cold glass.
• The cold glass cools down humid air outside.
• The glass absorbs water from the air.

What happens to water over time in an open cup?

• It freezes.
• It evaporates.
• It turns into ice.
• It gets heavier.

Where do the water droplets on the outside of a cold cup come from?

• From inside the cup
• From the air outside the cup
• From the ice inside the cup
• From the table underneath the cup

What causes water droplets to form on a cold surface?

• Cold air moving around the surface.
• Humid air coming into contact with the cold surface.
• The heat from the liquid inside the cup.
• The pressure of the air outside.

Why doesn’t the mass of a closed system change?

• Matter does not enter or leave a closed system.
• Matter can leave the system.
• Matter can enter the system.
• Mass only changes with temperature.

How do particles in a gas differ from those in a liquid?

• Gas particles are closer together than liquid particles.
• Liquid particles have more space between them than gas particles.
• Gas particles have a lot of space between them, while liquid particles do not.
• There is no difference; they are the same