Heat and Changing States of Matter - Discovery Education

ANSWER KEY for page 21TRUE OR FALSEPlace a T next to statements that are true and an F next to statements that are false.1. ___ F The energy of motion is called potential energy.2. ___ T Applying thermal energy to a material increases its kinetic energy.T3. ___ Wind blows as a result of heavier, colder air moving to displace warmer, lighter air.4. ___ F The amount of electrical energy produced by burning coal will exceed the potentialenergy available in the coal.5. ___ T The total amount of energy in a closed, isolated system will remain constant.6. ___ T Gases expand because the force of attraction between molecules is too weak to overcometheir kinetic energy.7. ___ F After reaching its boiling point, water will continue to get hotter if more heat is applied.8. ___ F All materials exposed to heat expand at the same basic rate.T9. ___ Walking barefoot across hot sand is an example of conduction.10. ___ F Materials that are good conductors of thermal energy are known as insulators.© Copyright 1999 AIMS Multimedia Heat and Changing States of Matter31