Chapter 8 Study Guide 
Chemical Equations
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1. Define each of the following:
        a) chemical equation
        b) activation energy
        c) combination reaction
        d) decomposition reaction
        e) single-displacement reaction
        f) double-displacement reaction
        g) endothermic
        h) exothermic

2. When the Greek letter delta appears over the arrow of a chemical equation, is the reaction most likely exothermic or endothermic?

3. What is conserved in a chemical reaction?

4. What do each of the following symbols represent when placed in parentheses after a chemical formula?
            (s)         (l)         (g)         (aq)

5. What is the major provider of energy for life on Earth?

6. What is the sum of the coefficients in the equation 2H2 + O2 ! 2H2O?

7. What are the causes of global warming?

8. Which side of a chemical equation is the energy term written for an endothermic reaction and an exothermic reaction?

9. What is formed when an acid and a base react?

10. What is always produced in a combustion reaction?

11. What is formed when a metal reacts with hydrochloric acid?

12. What happens to atoms during a chemical reaction?

13. How do chemical equations become balanced?

14. Name the four major types of chemical reactions and write their general formulas.

15. Balance each of the following equations. Then determine whether they are combination (C), decomposition (D), single-displacement (SD), or double-displacement (DD) reactions.
            a) Fe + AgNO3 ! Ag + Cu(NO3)
2

            b) SO3 + H2O ! H2SO4

            c) Al + O2 ! Al2O3

            d) (NH4)3PO4 + Ni(NO3)2 ! Ni3(PO4)2 + NH4NO3

            e) NaClO3 ! NaCl + O2

            f) Bi(NO3)3 + H2S ! Bi2S3 + HNO3

            g) LiAlH4 ! LiH + Al + H2

            h) KI + Br2 ! KBr + I2

            i) Na + H2O ! NaOH + H2

16. Answer the questions below about the potential energy diagram on the right.

a) What is the potential energy of the products?

b) What is the activation energy of the reaction?

c) What is the heat of reaction?

d) Is the reaction exothermic or endothermic?

e) What is the activation energy of the reverse reaction?

 

17. Answer the questions below about the potential energy diagram on the right:

a) What is the potential energy of the products?

b) What is the activation energy of the reaction?

c) What is the heat of reaction?

d) Is the reaction exothermic or endothermic?

e) What is the activation energy of the reverse reaction?