Chemical Reactions and Energy

What is the flow of energy from warmer matter to cooler matter called?

• Conduction

• Heat

• Insulation

• Radiation

What is used to measure temperature?

• Barometer

• Thermometer

• Hygrometer

• Anemometer

What happens to particles when they are cooled?

• They move faster and gain energy

• They move slower and lose energy

• They stop moving

• They explode

What is a chemical reaction?

• A process that rearranges atoms into a new substance

• A process that melts substances

• A process that freezes substances

• A process that dissolves substances.

Which of the following is NOT a sign of a chemical reaction?

• Gas production

• New odor

• Temperature change

• Dissolving

Which of the following is an example of an exothermic reaction?

• A) Baking soda and vinegar

• B) Cold pack

• C) MRE heater

• D) Sour milk

Which reaction absorbs energy?

• Exothermic

• Endothermic

• physical reaction

• Mrs. Brady

When elements combine chemically ....

• they retain their original properties

• a new substance with new properties is formed

• new atoms are formed

• nothing happens

Rusting is an .....

• endothermic reaction

• physical change

• exothermic reaction

• reactant

1.     What criteria should be considered when designing a flameless heater?

• It should only work indoors

• It must use electricity.

• It should require special tools.

• It should heat food safely without fire.