Chemical Reactions and
Balancing Equations
Directions: answer the following questions on a separate piece of paper.
1. What is a chemical equation? p 225
2. Label products and reactants in the formula Fe + S = FeS
3. What is the Law of Conservation of matter mean? p 226-227
4. When is a chemical equation balanced? p 228
5. Balance the following equation Na + 02 = Na2O
6. Tell why this equation is not balanced H2 + O2 = H2O
7. Why do we balance equations? p226
8. Write a chemical formula for the following 3 type of reactions (Don't draw pictures) p 230-231
a. synthesis
b. decomposition
c. replacement reaction
9. A reaction that liberates heat is called? p235
10. A reaction that absorbs heat is called?p236
11. What is activation energy? p 236
12. Why does an exothermic reaction need activation energy?
p 236
