Energy and Chemical
Reactions
Science 24 - Section 2.4
Flashlights
Can’t Miss the Energy….
To nearly unnoticeable
Burning Fuels! More than motion!
Exothermic
Endothermic
Other Examples?
Exothermic
Endothermic
Molten Sodium and Chlorine Gas
Hot and Cold Packs
DEMOS
Check your Understanding
1. How do exothermic and endothermic reactions differ? How are they
similar?
2. Some exothermic reactions can be quite dangerous. Give the reason
behind this statement.
3. Fossil fuel combustion reactions involve a fuel such as gasoline or
propane. The fuel is combined with oxygen to produce carbon dioxide
and water. We often think of these reactions as burning reactions. Are
they exothermic or endothermic?