Chemical Reactions

Which of the following involves a chemical change?

• Cutting bread

• Water boiling in a kettle

• New skin forming over a cut

• Breaking glass

What can sometimes be difficult to tell during a chemical reaction?

• If a new color is formed

• If a new substance is formed

• If the temperature changes

• If light is emitted

What is the first sign of a chemical reaction listed in the text?

• Color change

• Gas given off

• Temperature change

• Light emission

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

• Solid formation

• Color change

• Temperature change

• Melting

What tool is used to measure a temperature change in a chemical reaction?

• Barometer

• Thermometer

• Hygrometer

• Anemometer

What is the main topic of the section titled "Solid is Formed"?

• Chemical reactions

• Physical changes

• Precipitation

• Evaporation

What does the term "precipitation" refer to in chemistry?

• Formation of a gas

• Formation of a liquid

• Formation of a solid

• Formation of a plasma

What is it called when the temperature is taken in and you can feel it get colder?

• Endothermic

• Exothermic

• Thermogenic

• Cryogenic

What is the term for reactions that give out light but not heat?

• Photosynthesis

• Chemiluminescence

• Incandescence

• Fluorescence

What is another sign of a chemical reaction besides light?

• Sound

• Smell

• Taste

• Texture