PS.5.1.3 — Effects of Heat

Examples of insulators

• plastic

• metal

• water

• concrete

What can heating or cooling do to a material?

• It can change its state, size, or temperature, but not always its substance.

• It can always change its substance completely.

• It can only change its color.

• It has no effect on the material.

Give an example of a material that expands when heated.

• Wood

• Plastic

• Metal

• Glass

What happens to most materials when they are cooled?

• They expand and their particles move faster.

• They contract (shrink) and their particles move more slowly.

• They remain the same size and their particles stop moving.

• They dissolve in liquids and become less dense.

What are conductors of heat?

• Materials that allow heat to pass through easily—like metal.

• Materials that do not allow heat to pass through—like wood.

• Materials that absorb heat without transferring it—like rubber.

• Materials that reflect heat—like glass.

Examples of conductors

• silver, copper, gold, aluminum, and steel

• wood, plastic, rubber, and glass

• water, air, oil, and sand

• ceramics, paper, and fabric

What are insulators of heat?

• Materials that allow heat to pass through easily—like metals.

• Materials that do not allow heat to pass through easily—like wood, plastic, and silicone.

• Materials that conduct heat very well—like copper and aluminum.

• Materials that absorb heat without transferring it—like rubber and glass.

Why do changes often happen faster at higher temperatures?

• Heat gives particles more energy, making changes occur more quickly.

• Higher temperatures cause particles to slow down.

• Changes at higher temperatures are less significant.

• Temperature has no effect on the speed of changes.