Look over objectives and try those types ofproblems 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

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

Given the incomplete equation:

4Fe + 3O2 2X

Which compound is represented by X?

A.) FeO

B.) Fe2O3

C.) Fe3O2

D.) Fe3O4

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

Given the incomplete equation:

2N2O5(g)

Which set of products completes and balances the incomplete equation?

A.) 2N2(g) + 3H2(g)

B.) 2N2(g) + 2O2(g)

C.) 4NO2(g) + O2(g)

D.) 4NO(g) + 5O2(g)

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

D.) 4

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

Complete a balanced equation for the following reaction.

Ag(s) + KNO3(aq)

A.) AgNO3 + K

B.) AgK + NO3

C.) AgKNO3

D.) No reaction

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

What is the balanced chemical equation for the reaction that takes place between bromine and sodium

iodide?

A.) Br2 + NaI NaBr2 + I

B.) Br2 + 2NaI 2NaBr + I2

C.) Br + NaI2 NaBrI2

D.) Br + NaI2 NaBr + I2

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

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

Given the balanced equation:

2 C4H10 + 13 O2 8 CO2 + 10 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

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

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

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?

A.) 7.12

B.) 7.44

C.) 7.82

D.) 8.20

E.) 8.95

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?

A.) Ca, 4.78

B.) F2, 4.78

C.) Ca, 4.11

D.) F2, 4.11

E.) Ca, 3.22

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

The reactant you run out of first is known as

A.) the running reactant

B.) the excess reactant

C.) the absent reactant

D.) the limiting reactant

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

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%

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

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 %

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%