CHEMISTRY4th PERIOD REVIEW

CHAPTER 3B, LESSONS 3.1, 3.2, 3.3

I. ANSWER THE FOLLOWING QUESTIONS:

1. Signs that indicate that a chemical reaction is taking place.2. How can we increase the rate of a chemical reaction?’3. What happens during a chemical reaction?4. What is a chemical equation?5. What is a precipitate?6. What is an endothermic reaction?7. What is an exothermic reaction?8. State the Law of Conservation of Mass, and the name of the scientist who

discover it.9. What is a subscript?10. What is a coefficient?11. What are the reactants?12. What are the products?13. What is bond energy?

II. IN THE FOLLOWING CHEMICAL EQUATIONS, IDENTIFY THE REACTANTS AND THE PRODUCTS:1. CaO + O2 CO2 + H2O

2. C6H12O6 C2H5OH + CO2

3. Al2(SO4)3 + 6KOH 2Al(OH)3 + 3K2SO4

III. INDICATE HOW THE FOLLOWING SYMBOLS ARE READ IN A CHEMICAL EQUATION:1.

2. +

3.

4. (s)

5. (aq)

6. (l)

7. (g)

IV. BALANCE THE FOLLOWING CHEMICAL EQUATIONS:

1. Fe2O3 + C Fe + CO

2. Fe + O2 Fe2O3

3. Al + Br2 AlBr3

4. Pb(NO3)2 + NaCl PbCl2 + NaNO3

V. CLASSIFY THE FOLLOWING REACTIONS AS: SYNTHESIS, DECOMPOSITION, SIGLE REPLACEMENT, DOUBLE REPLACEMENT, COMBUSTION, EXOTHERMIC OR ENDOTHERMIC.

1. 2Mg + O2 2MgO ____________________________________

2. C6H12O6 + O2 CO2 + H2O + E ____________________________________

3. CO2 + H2O + E C6H12O6 + O2 ____________________________________

CuCO3 CuO + CO2 ____________________________________

4. AgNO3 + NaCl AgCl + NaNO3 ____________________________________

5. C6H12O6 2C2H6O + 2CO2 ____________________________________

6. Br2 + BaI2 BaBr2 + I2 ____________________________________

7. CH4 + 2O2 CO2 + 2H2O ____________________________________

VI. WRITE A CHEMICAL EQUATION FOR THE FOLLOWING REACTIONS:1. Solid lead reacts with oxygen gas to produce lead oxide (PbO2)2. Heating solid aluminum oxide (Al2O3) produces solid aluminum

and oxygen gas3. Dinitrogen pentoxide in the presence of platinum as a catalyst is

burned to form nitrogen gas (N2) with oxygen gas (O2)4. Aqueous solutions of potassium fluoride (KF) and calcium nitride

(Ca(NO3)2) react to form a precipitate of calcium fluoride (CaF2) and aqueous potassium nitride (KNO3)

5. Solid phosphorus reacts with chloride gas to form solid phosphorus pentachloride