Content Outline for Teaching - Potosi School District - Home

6
Content Outline
for Teaching
Energy
Underlined words and
phrases are to be filled
in by students on the
Note-taking Worksheet.
Section 3
Chemical Energy
A. Chemical reactions transform energy.
1. Compounds are broken down or new compounds are formed in a chemical
reaction.
2. Energy in chemical bonds is a form of potential energy called chemical energy.
3. In every chemical reaction, energy transformations occur.
B. To break chemical bonds, energy must be added; when chemical bonds form,
energy is released.
1. Endothermic reactions—chemical reactions that absorb energy
2. Exothermic reactions—chemical reactions that release energy
3. Chemical reactions occur at different rates; a catalyst changes the rate of
chemical reaction without its own structure being changed.
Discussion Question
How do endothermic and exothermic chemical reactions differ? endothermic—absorb
energy; exothermic—release energy
Energy 19