Thermal Energy Post Test

Front

Thermal energy is

Back

the total amount of kinetic and potential energy

Front

A scientist claims that chemicals like calcium chloride contain thermal energy. Which statement best supports this claim?

• When calcium chloride reacts with water, the water becomes cloudy.
• When calcium chloride reacts with water, the temperature does not change.
• When calcium chloride reacts with water, the calcium chloride dissolves.
• When calcium chloride reacts with water, the temperature increases.

Back

When calcium chloride reacts with water, the temperature increases.

Front

The movement of thermal energy from a warmer object to a cooler object is known as

Back

heat

Front

Why is there more thermal energy in an iceberg than in a pot of boiling water?

Back

Icebergs contain many more molecules than pots of water

Front

The image below shows water being heated in a pot over a campfire. What is happening to the molecules of water in the pot?

Back

The molecules’ motion increases, increasing kinetic energy.

Front

What is the difference between thermal energy and temperature?

Back

Thermal energy is the sum of the kinetic and potential energy of molecules, and temperature is the average kinetic energy of molecules.

Front

A golf ball and ping pong ball were left outside during the summer. Which sphere has more thermal energy?

Back

golf ball

Front

Average kinetic energy change in Cup 1 (4°C) placed in a room at 20°C?

Back

It will increase

Front

You place one cup of near freezing water (4°C) and one cup of hot water (80°C) in a room at room temperature (20°C). What will happen to the thermal energy in Cup 2?

Back

It will increase

Front

A teacher placed a metal spoon in a container of water with a temperature of 37°C (100°F). Then the teacher measured the temperature of the spoon in the water for 5 minutes. Which statement best describes the flow of energy in this system?

Back

The thermal energy transfers from the water to the spoon, heating the spoon and cooling the water.