Chapter 7 Leson 4 Chemical Changes

a change in matter in which the substances that make up the matter change into other substances that have new physical and chemical properties.

• physical change

• physical properties

• physical change

• physical properties

Which of the following is not a sign of a chemical change

• a change in color or odor

• a change in state

• the formation of bubbles

• the release of energy

Higher temperature usually ___________ rates of reaction

• have no affect

• decreases

• increases

• slows the

the amount of substance in a certain volume.

• surface area

• concentration

• mass

• density

Reaction rate increases when concentration ____________

• increases

• decreases

• stays the same

• slows

. Reaction rate is faster if surface area is _______

• small

• reduced

• limited

• large

Another name for a chemical change is a

• Chemical reaction

• physical reaction

• physical change

• chemical equation

A chemical reaction occurs when atoms __________ during a chemical change

• are removed

• stay the same

• rearrange

• decrease

A chemical reaction can be represented by a ___________

• coefficient

• chemical equation

• chemical symbol

• subscript

A chemical equation shows the ____________ of each substance in the reaction

• surface area

• chemical formula

• physical changes

• concentration