Quiz about Chemical Equations and Reactions Review

Question 1

Which of the following is a balanced chemical equation for the synthesis of water from hydrogen and oxygen?

Accepted Answer

$$2H_2 + O_2 \rightarrow 2H_2O$$

Answer

$$H_2 + O_2 \rightarrow H_2O$$

Answer

$$2H_2 + 2O_2 \rightarrow 2H_2O$$

Answer

$$H_2 + 2O_2 \rightarrow 2H_2O$$

Question 2

What is the term for a solution that contains more solute than it can theoretically hold at a given temperature?

Accepted Answer

Supersaturated

Answer

Unsaturated

Answer

Saturated

Answer

Dilute

Question 3

Which of the following is an example of a nonelectrolyte?

Accepted Answer

C $$_6$$ H $$_{12}$$ O $$_6$$ (glucose) (aq)

Answer

NaCl (aq)

Answer

HCl (aq)

Answer

KNO $$_3$$ (aq)

Question 4

What is the unit of molarity?

Accepted Answer

mol/L

Answer

g/L

Answer

L/mol

Answer

mol/g

Question 5

Which of the following is a double replacement reaction?

Accepted Answer

$$AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$$

Answer

$$2H_2 + O_2 \rightarrow 2H_2O$$

Answer

$$2KClO_3 \rightarrow 2KCl + 3O_2$$

Answer

$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$

Question 6

Which of the following best describes a saturated solution?

Accepted Answer

A solution that contains the maximum amount of dissolved solute at a given temperature

Answer

A solution that can dissolve more solute at a given temperature

Answer

A solution that contains less solute than it can hold

Answer

A solution that contains undissolved solute at the bottom

Question 7

Which of the following is a combustion reaction?

Accepted Answer

$$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$$

Answer

$$2Na + Cl_2 \rightarrow 2NaCl$$

Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$$

Answer

$$Fe + CuSO_4 \rightarrow FeSO_4 + Cu$$

Question 8

If you have 2.0 moles of NaCl dissolved in enough water to make 1.0 L of solution, what is the molarity of the solution?

Accepted Answer

2.0 M

Answer

0.5 M

Answer

1.0 M

Answer

4.0 M

Question 9

A sample of gas occupies 4.0 L at 1.0 atm. If the pressure is increased to 2.0 atm at constant temperature, what will be the new volume?

Accepted Answer

2.0 L

Answer

4.0 L

Answer

8.0 L

Answer

1.0 L

Question 10

Which of the following pairs will form a precipitate when mixed, based on solubility rules?

Accepted Answer

AgNO $$_3$$ and NaCl

Answer

NaNO $$_3$$ and KCl

Answer

KNO $$_3$$ and NaCl

Answer

NaNO $$_3$$ and AgNO $$_3$$

Question 11

Which of the following is an example of a single replacement reaction?

Accepted Answer

$$Zn + 2HCl \rightarrow ZnCl_2 + H_2$$

Answer

$$2KClO_3 \rightarrow 2KCl + 3O_2$$

Answer

$$AgNO_3 + NaCl \rightarrow AgCl + NaNO_3$$

Answer

$$C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O$$

Question 12

A solution contains 0.5 moles of KBr in 250 mL of solution. What is the molarity of the solution?

Accepted Answer

2.0 M

Answer

0.2 M

Answer

0.5 M

Answer

1.0 M

Question 13

Which of the following best describes the relationship between pressure and volume for an ideal gas at constant temperature?

Accepted Answer

Inversely proportional

Answer

Directly proportional

Answer

No relationship

Answer

Exponentially proportional

Question 14

Given the reaction: $$2KClO_3 \rightarrow 2KCl + 3O_2$$ , how many moles of $$O_2$$ are produced when 4 moles of $$KClO_3$$ decompose?

Accepted Answer

6 moles

Answer

2 moles

Answer

3 moles

Answer

4 moles

Question 15

A student mixes solutions of Na $$_2$$ SO $$_4$$ and BaCl $$_2$$ . Predict the precipitate formed, if any.

Accepted Answer

BaSO $$_4$$

Answer

NaCl

Answer

Na $$_2$$ Cl $$_2$$

Answer

No precipitate

Question 16

A student is given a mixture of two clear solutions. After mixing, a white solid forms. Using evidence and solubility rules, explain what type of reaction has occurred and identify the possible product.

Accepted Answer

Double replacement; possible product is AgCl

Answer

Synthesis; possible product is NaCl

Answer

Decomposition; possible product is H $$_2$$ O

Answer

Single replacement; possible product is KNO $$_3$$

Question 17

A student needs to prepare 250 mL of a 0.4 M NaOH solution. Calculate the number of moles of NaOH required and describe the steps to prepare the solution.

Accepted Answer

0.1 moles; dissolve 0.1 moles NaOH in less than 250 mL water, then dilute to 250 mL

Answer

0.1 moles; dissolve 0.1 moles NaOH in 250 mL water

Answer

0.4 moles; dissolve 0.4 moles NaOH in 250 mL water

Answer

0.4 moles; dissolve 0.4 moles NaOH in less than 250 mL water, then dilute to 250 mL

Question 18

A reaction vessel contains 3.0 L of gas at 2.0 atm and 300 K. If the temperature is increased to 600 K and the pressure is decreased to 1.0 atm, what is the final volume of the gas? (Assume ideal gas behavior.)

Accepted Answer

12.0 L

Answer

3.0 L

Answer

6.0 L

Answer

18.0 L

Question 19

Given the unbalanced equation: $$C_2H_6 + O_2 \rightarrow CO_2 + H_2O$$ , balance the equation and explain how the law of conservation of mass is satisfied.

Accepted Answer

$$2C_2H_6 + 7O_2 \rightarrow 4CO_2 + 6H_2O$$ ; mass is conserved because atoms are equal on both sides

Answer

$$C_2H_6 + 2O_2 \rightarrow 2CO_2 + 3H_2O$$ ; mass is not conserved

Answer

$$C_2H_6 + 3O_2 \rightarrow 2CO_2 + 2H_2O$$ ; mass is not conserved

Answer

$$2C_2H_6 + 6O_2 \rightarrow 4CO_2 + 6H_2O$$ ; mass is not conserved

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