Equations & Stoichiometry Review
1. How many oxygen atoms are in 3Ba(ClO3)2?
a. 3
b. 2
c. 9
d. 18
2. Which of the following is NOT an indication that a chemical reaction has taken place?
a. Formation of gas
b. color change
c. Production of water
d. production of a precipitate
3. A balanced equation will have
a. the same subscripts
b. equal number of each type of atom in both the reactants and products
c. the same coefficients
d. the reactants and products will be the same
4. AgNO3(aq) + NaCl(aq)  AgCl(s) + NaNO3(aq) is an example of what type of reaction?
a. Synthesis
b. decomposition
c. Single-replacement
d. double-replacements
5. According to the activity series, will the following reaction occur?
Mg (s) + 2H2O (l)  Mg(OH)2 (aq) + H2 (g)
a. Yes, because Mg is higher than H2 on the table
b. Yes, because Mg is lower than H2 on the table
c. No because Mg is lower than H2 on the table
d. No because Mg will only react with water hot enough to be steam
6. Which types of reactions are known as displacement reactions?
a. single-replacement
b. synthesis
c. double replacement
d. both a and c
7. How is a reaction written that includes the use of a catalyst?
a. the name or formula of the catalyst written about the arrow
b. the name or formula of the catalyst written below the arrow
c. the name or formula of the catalyst is added to the end of the reaction
d. An arrow pointing up is used to show that a catalyst has been used
8. The following reaction shows which type of chemical reaction
CaO (s) + H2O (l) Ca(OH)2 (s)
a. synthesis
b. decomposition
c. single replacement
d. double replacement
9. Which of the following chemical equations match the following reaction?
Sodium Carbonate yield Sodium Oxide and Carbon Dioxide
a. NaCO3 + NaO + CO2
b. Na3CO3 + Na2O + CO2
c. Na2CO3 + Na2O + CO2
d. Na2CO3 + Na3O + CO2
10. Which of the following equations shows a decomposition reaction?
a. Silver Oxide and Sodium Hydroxide yield Silver Hydroxide and Sodium Oxide
b. Methane and Oxide yield Carbon Dioxide and Water
c. Sodium Carbonate yields Sodium Oxide and Carbon Dioxide
d. Hydrogen and Iodine yield Hydrogen Iodide
11. Combustion Reactions always
a. yield carbon dioxide and hydrogen
b. yield carbon dioxide and water
c. have carbon dioxide and water as reactants
d. have oxygen as a product
e.
12. Which of the following reactions is balanced correctly
a. 2Ag2O  4Ag + O2
b. 4Ag2O  8Ag + 2O2
c. 2Fe + 3O2  2Fe2O3
d. 2Al + 2NiSO4  3Ni + Al2(SO4)3
e.
13. According to the Activity Series, which element will replace Lead but not Nickel?
a. Hydrogen
b. Cobalt
c. Tin
d. Cadmium
e.
14. The maximum amount of product that can be produced from a given amount of reactant is
a. actual yield
b. theoretical yield
c. percent yield
d. limiting reagent
15. The limiting reagent is defined as
a. The substance that is not used up completely in a reaction
b. The reactants in a chemical reaction
c. The reactant that limits the amount of product that can form
d. The product that is limited
16. The number of moles of each reactant and product in a chemical equation is represented by
a. The subscripts
b. The coefficients
c. The number of products
d. Cannot be determined by the equation
17. Which of the following calculates percent yield
a. (actual yield/theoretical yield)
b. (theoretical yield/ actual yield)
c. (theoretical yield/ actual yield) * 100
d. (actual yield/ theoretical yield) * 100
18. A substance that changes the rate of a chemical reaction without being consumed is known as a (n)
a. catalyst
b. reactant
c. product
d. reagent
19. Which type of reaction is represented by the following?
A + BX  AX + B
a. synthesis
b. decomposition
c. single replacement
d. double replacement
20. According to the activity series, will the following reaction occur?
Cu (s) + HCl (aq)  CuCl (aq) + H2 (g)
a. Yes because Cu is below H2 on the activity series list
b. Yes because Cu is above H2 on the activity series list
c. No because Cu is above H2 on the activity series list
d. No because Cu is below H2 on the activity series list
Short Answer
21. What are the 4 indicators that a chemical reaction has occurred?
22. Change the following word equation into a chemical equation, balance the equation and tell what type
of reaction it is:
Solid Magnesium and Copper (II) Nitrate in aqueous solution yield Magnesium Nitrate in aqueous solution
and solid Copper
23. Determine if the following reaction will occur and write a balanced equation
Chlorine gas and Potassium Iodide in aqueous solution
24. Write a balance equation, an ionic equation and a net ionic equation for the reaction between Cu and
FeSO4
SHOW ALL WORK
25. Find the mass of all of the products given the following information
Fe2O3 + CO  Fe + CO2
40 g of Fe2O3
26. Determine the limiting reagent of the following
Cu + AgNO3  Cu(NO3)2 + Ag
2.5 mol of Cu and 5.5 mol of AgNO3
27. Calculate percent yield of the following
CO + 2H2  CH3OH
If 75 g of CO reacts to produce 68.4 g CH3OH, what is the percent yield of CH3OH?
Answer Key
1. d
2. c
3. b
4. d
5. d
6. d
7. a
8. a
9. c
10. d
11. b
12. a
13. c
14. b
15. c
16. b
17. d
18. a
19. c
20. c
21. Gas production, Formation of a precipitate, Color Change, Hear/Energy Formation
22. Mg(s) + Co(NO3)2 (aq)  Mg(NO3)2 (aq) + Co(s)
23. A reaction will occur and the balanced equation is
Cl2 (g) + 2KI (aq) 2KCl (aq) + I2 (s)
24. Balanced Equation: Cu + FeSO4  Fe + CuSO4
Ionic Equation: Cu(s) + Fe2+(aq) + SO42-(aq)  Fe(s) + Cu2+(aq) + SO42-(aq)
Net Ionic Equation: Cu(s) + Fe2+(aq)  Fe(s) + Cu2+(aq)
25. Balanced equation: Fe2O3 + 3CO 2Fe + 3CO2
27.98 g Fe and 33.07 g CO2
26. Copper is the limiting reagent
27. Percent Yield = 79.8%