Free Printable Gen Chem Exam 2 Review

1.

Which expression can be used to solve a mass-to-mole conversion for the equation HCL -----> H₂ + Cl₂? Given: Mass of HCl and unknown: Mol of Cl2

a)

$mass\ HCl\ x\ \frac{1\ mol\ HCl}{molar\ mass\ HCl}\ x\ \frac{1\ mol\ Cl2}{2\ mol\ HCl}$

b)

$mass\ HCl\ x\frac{1\ mol\ Cl2\ }{2\ mol\ HCl}$

2.

In the reaction represented by the equation CH4(g) + O2(g) ----> CO₂(g) + H₂O(g), a mass of 125 g CH₄is reacted with excess oxygen. The expression:

$125\ g\ CH_{4\ }\times\frac{1\ mol\ CH_4}{16.05\ g\ CH_4}\times\frac{2\ mol\ H_2O\ }{1\ mol\ CH_4}\times\frac{18.20\ g\ H_2O}{1\ mol\ H_2O}$

is used to calculate the:

a)

mass of oxygen redacted.

b)

mass of carbon dioxide produced.

c)

mass of water produced.

d)

none of the above.

3.

What is the mole ratio of H2O to H3PO4 in the following chemical equation?

$P_4O_{10}+6H_2O\ \rightarrow\ 4H_3PO_4$

a)

1 to 6

b)

3 to 2

c)

4 to 6

d)

2 to 3

4.

In the equation $6CO_2+6H_2O\ \rightarrow\ C_6H_{12}O_6+6O_2$ the mole ratio of water to oxygen is:

a)

2 : 1

b)

1 : 1

c)

3 : 2

d)

6 : 8

5.

For the reaction represented by the equation $Pb\left(NO_3\right)_2+2KI\ \rightarrow\ PbI_2+2KNO_3$ how many moles of lead iodide $\left(PbI_2\right)$ are produced of 300 grams potassium iodide $\left(KI\right)$ when $Pb\left(NO_3\right)_2$ is in excess?

a)

114.78 mol PbI₂

b)

0.904 grams PbI₂

c)

0.904 mol PbI₂

d)

114.78 grams PbI₂

6.

For the reaction represented by the equation $2KClO_3\rightarrow\ 2KCI+30_2$ how many grams of potassium chlorate are required to produce 160. g of oxygen?

a)

408 g KClO₃

b)

804 g KClO₃

c)

598 g KClO₃

d)

There is not enough information.

7.

What is a limiting reactant?

a)

the reactant that determines how much product can be made

b)

the reactant that is in excess

c)

the product that you can make the most of

d)

the amount of reactants that react with each other

8.

How much water can be made if 8 moles of NH₃ react with 6 moles of NO?

4NH₃+6NO --> 5N₂ + 6H₂O

a)

5 moles

b)

6 moles

c)

12 moles

d)

18 moles

9.

In a lab, a scientist calculated that he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

a)

82.1%

b)

22.8%

c)

18.7%

d)

12.2%

10.

In a balanced equation, the ratio between the coefficient of any two substances is called the _______.

a)

mole ratio

b)

stoichiometry

c)

limiting reactant

d)

excess reactant

11.

In the image, which reactant is limiting?

a)

The white molecules, because there are extra.

b)

The black atoms, because they are completely used up.

c)

The white molecules, because they are completely used up.

d)

The black atoms, because there are extra.

12.

A student burns 1.50 mol C₃H₈ according to the following reaction:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

How many grams of carbon dioxide are produced?

a)

44.0 g

b)

66.1 g

c)

132 g

d)

198 g

13.

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

a)

AlCl3

b)

Cl2

c)

Al

14.

What is the actual yield?

a)

the maximum amount of product from a reaction

b)

the amount of product recovered from a lab experiment

c)

amount of product that causes the reaction to stop

d)

the amount of product needed to reverse the reaction

15.

When does a chemical reaction stop?

a)

When the lab is finished

b)

When the excess reactant is used up

c)

When the limiting reactant is used up

d)

Chemical reactions never stop

16.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

17.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

18.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

19.

What reaction has the following general formula:
$C_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

20.

What is the general reaction scheme for a double replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

$C_xH_y+O_2\ ->\ CO_2+H_2O$

21.

What type of reaction is the following:
$BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

22.

What type of reaction is the following:
$C_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

23.

What type of reaction is the following:
$Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

24.

Which option is correctly balanced?

a)

Fe + H₂O --> Fe₃O₄ + H₂

b)

3 Fe + H₂O --> Fe₃O₄ + H₂

c)

3 Fe + 4 H₂O --> Fe₃O₄ + 4 H₂

d)

3 Fe + 2 H₂O --> Fe₃O₄ + H₂

25.

Which Option is Correctly Balanced?

a)

Hg + O₂ --> Hg₂O₂

b)

2 Hg + 2O₂ --> Hg₂O₂

c)

2 Hg + O₂ --> Hg₂O₂

d)

Hg + 2 O₂ --> Hg₂O₂

26.

What are the coefficients that will balance the skeleton equation below?

__Na + __MgF₂ → __NaF + __Mg

a)

2,1,1,2

b)

1,2,1,2,

c)

2, 1, 2, 1

d)

1,2,2,1

27.

What are the coefficients that will balance the skeleton equation below?

__Fe +__O₂ → __Fe₂O₃

a)

3,4,2

b)

4, 3, 2

c)

2,3,4

d)

4,2,3

28.

Which of the following values would represent the pH of a strong base?

a)

1

b)

8

c)

7

d)

13

29.

Complete the definition below:

Acids are....

a)

hydrogen donors.

b)

hydrogen acceptors.

c)

proton donors.

d)

proton acceptors.

30.

Acids which dissociate almost completely in aqueous solutions are known as:

a)

Dilute acids

b)

Strong acids

c)

Weak acids

d)

Concentrated acids

31.

When dissolved in water, bases produce:

a)

acids

b)

salts

c)

hydrogen ions

d)

hydroxide ions

32.

Predict the products for the following reaction: LiOH + H₂SO₄-->

(Hint: it is a neutralization reaction)

a)

LiSO₄ + H₂O

b)

LiSO₄ + H₂(OH)

c)

Li₂SO₄ + H₂O

d)

Li₂SO₄ + H₂(OH)

33.

Strong acids and bases...

a)

do not dissociate into ions (non-electrolyte)

b)

partially dissociate into ions (weak electrolyte)

c)

completely dissociate into ions (non-electrolyte)

d)

completely dissociate into ions (strong electrolyte)

34.

A substance that does not dissociate completely. Ranges from 4-7 on the pH scale.

a)

Strong Acid

b)

Strong Base

c)

Weak Acid

d)

Weak Base

35.

Hydrochloric (HCl) is a

a)

Weak Acid

b)

Weak Base

c)

Strong Acid

d)

Strong base

36.

Sodium hydroxide (NaOH) is a

a)

Weak Acid

b)

Weak Base

c)

Strong Acid

d)

Strong base

37.

What are the weak acids and bases?

a)

all acids and bases are weak

b)

if not classified as strong, the acid/base is considered weak

c)

all acids and bases are strong

d)

there are more strong acids and bases than there are weak acids/bases

38.

Which of the following is NOT a strong acid

a)

Sulfuric acid

b)

Hydrochloric acid

c)

Perchloric acid

d)

Hydrofluoric acid

39.

Which of the following is a weak base

a)

Sodium hydroxide

b)

Rubidium hydroxide

c)

Magnesium hydroxide

d)

Strontium hydroxide

40.

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

a)

0.8 M

b)

1.5M

c)

3.0M

d)

6.0M

41.

Which equation is used to find molarity?

a)

Moles solute/L solution

b)

Moles solute/kg solution

c)

Moles solute/kg solvent

d)

Grams solute/L solution

Gen Chem Exam 2 Review

Total questions: 41

Worksheet time: 40mins

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