1. Chapter 14
Chemical
Reactions

2. Part 1
What is a
Chemical Reaction?

3. Substances undergo chemical reactions, which form new substances.
These new substances have properties that are different than the
properties of the
original substances.

4. Chemical Reactions
A chemical reaction a process that results in a new substance, or product.

5. precipitate forms gas forms color change energy change change in odor
Signs That a Chemical Reaction Has Occurred:
precipitate forms
gas forms
color change
energy change
change in odor

6. precipitate forms
A precipitate is a solid substance that forms in a solution.
It usually settles to the bottom of the container because it is denser than the solution.

7. gas forms
bubbling, fizzing occurs when solids/liquids are reacted

8. color change

9. energy change
energy is either released (exothermic)
or absorbed (endothermic)

10. change in odor