Thermal Energy Practice Quiz

Which of the following is not a source of thermal energy?

• Friction

• Heat source

• Chemical reaction

• socks

You have two identical stuffed animals in your room. One in the shade and one in the direct sunlight of the window. What happens to the thermal energy of the two stuffed animals.

• The one in the shade will have less thermal energy and the one in the sunlight will obtain more thermal energy.

• More thermal shade, less thermal in the sunlight.

• Both will have the same because they are identical having the same amount of mass.

• The both will raise temperature and thermal energy about 15 degrees, just the one in the shade will take less time to reach the top temperature.

Which of the following is false about chemical reactions?

• They make new substances.

• They may either lose or gain energy.

• They always gain energy from the surroundings.

• They may look different after the reaction.

Define Thermal Energy

• The average kinetic energy of all particles in a substance.

• The flow or exchange of thermal energy to another substance.

• The total amount of kinetic energy contained in the atoms of a substance.

• The amount of heat transfer from one system to another.

Which type of chemical reaction is found to create an ice pack for a sport injury.

• Exothermic

• Endothermic

• Closed System

• Thermal Energy

The measure of the average kinetic energy of all molecules in a sample of matter.

• Heat

• Thermal Energy

• Radiation

• Temperature

Which of the following would contain molecules with the greatest average kinetic energy?

• Water vapor from your breath on a cold night.

• A snow ball

• Ice on a pond

• A glass of hot coco

Tags

NGSS.HS-PS3-2

If the molecules in an object begin to move faster, their average kinetic energy will __________and the object's temp. will ___________.

• Increase, rise.

• Increase, fall.

• decrease, rise.

• decrease, fall.

Which of the following helps explain why salt dissolves more rapidly in hot water than in cold water?

• The salt and hot water form bonds

• The salt reacts best with water

• The salt breaks down into smaller molecules in hot water instead of cold water.

• The greater motion of hot water molecules causes the salt molecules to spread out more quickly.

A student bends a paper clip back and forth. The temp. goes up at the point of bending. Why?

• The molecules of the clip start moving slower.

• The molecules of the clip start moving faster.

• The sun heats up the clip very fast.

• The clip is called a heat source which gives off energy.