1. Look over objectives and try those types of
problems on past worksheets and quizzes,
especially if you know you are weak on it
Come in for help before the test for extra help or to retake quizzes!
These are the “clicker” questions from this unit
Ans: (2) B (3) B (4) A (5) C (6) A (7) D (8) D (9) A (10) B (11) B (12) D (13) C (14) B (15) B (16) D (17) D (18) D (19) D (20) B (21) D (22) C (23) C (24) D
Notably missing from these are questions about identifying types of reactions and why we balance equations and how you know an equation is balanced

2. What are the products in the following chemical equation:
Multiple Choice
iRespond Question
What are the products in the following chemical equation:
Zn + CuSO4  ZnSO4 + Cu
A.) zinc and copper
B.) zinc sulfate and copper
C.) zinc and copper (II) sulfate
D.) only zinc
E.)

3. 4Fe + 3O2  2X Which compound is represented by X? A.) FeO B.) Fe2O3
Given the incomplete equation:
4Fe + 3O2  2X
Which compound is represented by X?
iRespond Question F
Multiple Choice
A.) FeO
B.) Fe2O3
C.) Fe3O2
D.) Fe3O4
E.)

4. CaSO4 + AlCl3  Al2(SO4)3 + CaCl2F
Multiple Choice
iRespond Question
CaSO4 + AlCl3  Al2(SO4)3 + CaCl2
What is the coefficient of Al2(SO4)3 when the equation is completely balanced using the smallest whole-number coefficients?
A.) 1
B.) 2
C.) 3
D.) 4
E.)

5. Given the incomplete equation:
2N2O5(g) 
Which set of products completes and balances the incomplete equation?
iRespond Question F
Multiple Choice
A.) 2N2(g) + 3H2(g)
B.) 2N2(g) + 2O2(g)
C.) 4NO2(g) + O2(g)
D.) 4NO(g) + 5O2(g)
E.)

6. Given the unbalanced equation:F
Multiple Choice
iRespond Question
Given the unbalanced equation:
Al + O2  Al2O3
When this equation is completely balanced using smallest whole numbers, what is the sum of the coefficients?
A.) 9
B.) 7
C.) 5
E.)
D.) 4

7. nitrogen trifluoride  nitrogen + fluorine
Multiple Choice
iRespond Question
If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be?
nitrogen trifluoride  nitrogen + fluorine
A.) 6F2
B.) F3
C.) 6F
D.) 3F2
E.)

8. Complete a balanced equation for the following reaction.
Ag(s) + KNO3(aq) 
iRespond Question F
Multiple Choice
A.) AgNO3 + K
B.) AgK + NO3
C.) AgKNO3
D.) No reaction
E.)

9. F
Multiple Choice
iRespond Question
A double-replacement reaction takes place when aqueous Na2CO3 reacts with aqueous Sn(NO3)2. You would expect one of the products of this reaction to be ________.
A.) NaNO3
B.) NaSn
C.) Sn(CO3)2
D.) CNO3
E.)

10. iRespond Question F
What is the balanced chemical equation for the reaction that takes place between bromine and sodium iodide?
Multiple Choice
A.) Br2 + NaI  NaBr2 + I
B.) Br2 + 2NaI  2NaBr + I2
C.) Br + NaI2  NaBrI2
D.) Br + NaI2  NaBr + I2
E.)

11. F
Multiple Choice
iRespond Question
Given the balanced equation representing a reaction:
F2(g) + H2(g)  2HF(g)
What is the mole ratio of H2(g) to HF(g) in this reaction?
A.) 1:1
B.) 1:2
C.) 2:1
D.) 2:3
E.)

12. F
Multiple Choice
iRespond Question
Given the reaction:
6 CO2 + 6 H2O  C6H12O6 + 6 O2
What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
A.) 2.5
B.) 6.0
C.) 12
D.) 15
E.)

13. Given the balanced equation:F
Multiple Choice
iRespond Question
Given the balanced equation:
2 C4H O2  8 CO H2O
What is the total number of moles of O2 that must react completely with 5.00 moles of C4H10?
A.) 10.0
B.) 20.0
C.) 26.5
D.) 32.5
E.)

14. 2Pb(NO3)2(s)  2PbO(s) + 4NO2(g) + O2(g)F
Multiple Choice
iRespond Question
2Pb(NO3)2(s)  2PbO(s) + 4NO2(g) + O2(g)
How many grams of oxygen are produced when 11.5 grams of NO2 is formed?
A.) 1.00 g
B.) 2.00 g
C.) 2.88 g
D.) 32.0 g
E.)

15. F
Multiple Choice
iRespond Question
4Fe(s) + 3O2(g) 2Fe2O3(s)
How many grams of Fe2O3 are formed when 16.7 grams of Fe reacts completely with oxygen?
A.) 12.0 g
B.) 23.9 g
C.) 47.8 g
D.) 95.6 g
E.)

16. H3PO4 + 3 NaOH Na3PO4 + 3 H2O
What mass of Na3PO4 can be prepared by the reaction of 4.90 g of H3PO4 with an excess of NaOH?
iRespond Question F
Multiple Choice
A.) 7.12
B.) 7.44
C.) 7.82
D.) 8.20
E.) 8.95

17. Ca + F2  CaF2
What is the limiting reagent and what quantity of CaF2 results from the reaction of 3.00 g of calcium and 2.00 g of fluorine?
iRespond Question F
Multiple Choice
A.) Ca, 4.78
B.) F2, 4.78
C.) Ca, 4.11
D.) F2, 4.11
E.) Ca, 3.22

18. F
Multiple Choice
iRespond Question
Once the limiting reactant is all used up in a reaction, the left-over reactant is known as
A.) the product
B.) the limited reactant
C.) the limiting reactant
D.) the excess reactant
E.)

19. The reactant you run out of first is known as
iRespond Question F
Multiple Choice
A.) the running reactant
B.) the excess reactant
C.) the absent reactant
D.) the limiting reactant
E.)

20. F
Multiple Choice
iRespond Question
When we use a balanced equation to predict the number of grams of a product in a reaction, we get the
A.) product yield
B.) theoretical yield
C.) percent yield
D.) actual yield
E.)

21. F
Multiple Choice
iRespond Question
In an experiment, students determined the theoretical yield to be 20 grams. Their actual yield was 15 grams. What was their percent yield?
A.) 133%
B.) 1.33%
C.) 0.75%
D.) 75%
E.)

22. F
Multiple Choice
iRespond Question
In an experiment, students determined the theoretical yield to be 12 grams. Their percent yield was 90 percent. What was their actual yield?
A.) 13.3 g
B.) 5.3 g
C.) 10.8 g
D.) 7.5 g
E.)

23. F
Multiple Choice
iRespond Question
Cu + 2AgNO3  Cu(NO3)2 + 2Ag
12.7 grams of Copper produces 38.1 grams of Silver in a laboratory. What is the percent yield of this reaction?
A.) 56.7 %
B.) 77.3 %
C.) 88.9 %
D.) 176 %
E.)

24. F
Multiple Choice
iRespond Question
4 NH3 + 5 O2  4 NO + 6 H2O
The reaction of 0.68 g of NH3 with excess O2 according to the following reaction yields 0.98 g of NO. What is the percent yield?
A.) 72%
B.) 74%
C.) 78%
D.) 82%
E.) 86%