1. Energy and Chemical Reactions
Physical Science
Chapter 10.2 Part 2

2. Our Story So Far … Discuss with your partner, discuss with the class.
How do you balance a chemical equation?
What is activation energy and why is it important?
What is an addition reaction?
What is a decomposition reaction?

3. Displacement and precipitation reactions
Aka replacement reactions
One element replaces a similar element in a compound
Fe(s) + CuCl2(aq) Cu(s) + FeCl2(aq)
One for the substances formed is no longer soluble
CO2(g) + CaO2H2(aq) CaCO3(s) + H2O(l)

4. Combustion Reaction
Petroleum (gasoline) is a hydrocarbon made of hydrogen and carbon (and oxygen and nitrogen and sulfur) left over from ancient plant and animal life
Petroleum is refined (separated) into gasoline, kerosene, and heating oil.
Gasoline undergoes an combustion reaction that yields carbon dioxide, carbon monoxide, water, nitrogen oxides, and sulfuric acid

5. Nuclear Reactions Nuclear reactions are not chemical reactions
They change the nucleus of an atom
One element becomes a different element
One isotope becomes a different isotope
Involves strong nuclear force and produces a lot of energy
Mass + energy is conserved (but not mass & energy)
E = mc2

6. Nuclear Reaction

7. Activity
Identify types of chemical reactions
Due at end of class