MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

When an oxidation-reduction reaction occurs, there must be a transfer of

a. electrons

b. neutrons

c. protons

d. ions

Correct Answer: a

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the reaction:

Cl(g) + Cl(g) --> Cl₂(g) + energy

Which statement best describes the reaction?

a. A bond is formed and energy is absorbed.

b. A bond is formed and energy is released.

c. A bond is broken and energy is absorbed.

d. A bond is broken and energy is released.

Correct Answer: b

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

If equal volumes of 0.1 M NaOH and 0.1 M HCl are mixed, the resulting solution will contain a salt and

a. HCl

b. NaOH

c. H₂O

d. NaCl

Correct Answer: c

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Which reaction occurs when equivalent quantities of H⁺ (or H₃O⁺) and OH^- are mixed?

a. oxidation

b. reduction

c. hydrolysis

d. neutralization

Correct Answer: d

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

When butane burns in an excess of oxygen, the principal products are

a. CO₂ and H₂O

b. CO₂ and H₂

c. CO and H₂O

d. CO and H₂

Correct Answer: a

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Which reaction represents the process of neutralization?

a. Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

b. HCl(aq) + KOH(aq) --> KCl(aq) + H₂O(l)

c. Pb(NO₃)₂(aq) + CaCL₂ --> Ca(NO₃)₂(aq) + PbCl₂(s)

d. 2KClO₃(s) --> 2KCl(s) + 3O₂(g)

Correct Answer: b

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

How many moles of solute are contained in 200 milliliters of a 1M solution?

a. 1

b. 0.2

c. 0.8

d. 200

Correct Answer: b

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Use the following equation to answer the question:

Energy + 2C + 3H₂ Í C₂H₆

carbon hydrogen ethane

On the right hand side of the equation are two carbons and six hydrogens. On the left hand side are two carbons and six hydrogens. This is because:

a. Only two carbons can react with six hydrogens.

b. The conservation of matter is reflected in this model.

c. The conservation of volume is reflected in this model.

d. The formation of ethane requires small amounts of energy.

e. The formation of ethane requires large amounts of energy.

Correct Answer: b

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

If an equation is balanced properly, both sides of the equation must have the same number of

a. atoms

b, coefficients

c. molecules

d. moles of molecules

Correct Answer: a

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Which equation is correctly balanced?

a. H₂ + O_s --> H₂O

b. Ca + Cl₂ --> CaCl

c. 2H₂ + O₂ --> 2H₂O

d. Ca + Cl₂ --> Ca₂Cl

Correct Answer: c

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the balanced equation:

2Na + S --> Na₂S

What is the total number of moles of S that reacted when 4.0 moles of Na were completely consumed?

a. 1.0 mole

b. 2.0 moles

c. 0.5 mole

d. 4.0 moles

Correct Answer: b

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the unbalanced equation:

__Al(s) + __O₂(g) --> __Al₂O₃(s)

When this equation is correctly balanced using smallest whole numbers, what is the coefficient of O₂(g)?

a. 6

b. 2

c. 3

d. 4

Correct Answer: c

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the reaction:

C₆H₁₂O₆(s) + 6O₂ (g) --> 6CO₂(g) + 6H₂(l)

How many moles of C₆H₁₂O₆ are needed to produce 24 moles of carbon dioxide?

a. 1.0 moles

b. 12 moles

c. 24 moles

d. 4.0 moles

Correct Answer: d

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the unbalanced equation:

__Mg(ClO₃)₂(s) --> __MgCl₂(s) + __O₂(g)

What is the coefficient of O₂ when the equation is balanced correctly using the smallest whole-number coefficients?

a. 1

b. 2

c. 3

d. 4

Correct Answer: c

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the reaction:

6CO₂ + 6H₂ --> C₆H₁₂O₆ + 6O₂

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

Correct Answer: d

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the unbalanced equation:

__Al + __CuSO₄ --> __Al₂(SO₄)₃ + __Cu

When the equation is balanced using the smallest whole-number coefficients, what is the coefficient of Al?

a. 1

b. 2

c. 3

d. 4

Correct Answer: b

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the equation:

2C₂H₂(g) + 5O₂(g) --> 4CO₂(g) + 2H₂O(g)

How many moles of oxygen are required to react completely with 1.0 mole of C₂H₂?

a. 2.5

b. 2.0

c. 5.0

d. 10

Correct Answer: a

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Given the unbalanced equation:

__Fe₂0₃ + __CO --> __Fe + __C0₂

When the equation is correctly balanced using the smallest whole-number coefficients, what is the coefficient of CO?

a. 1

b. 2

c. 3

d. 4

Correct Answer: c

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

1. Use the periodic table to find the molar mass for Na₂SO₄.

a. 22.99 grams/mole

b. 71.05 grams/mole

c. 119.05 grams/mole

d. 142.04 grams/mole

e. 149.03 grams/mole

2. Using the periodic table find the molar mass for A1₂(S0₄)₃.

a. 26.98 grams/mole

b. 75.04 grams/mole

c. 123.04 grams/mole

d. 150.02 grams/mole

e. 278.01 grams/mole

Correct Answers:

1. d

2. d

MC	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

1. What are the coefficients needed to balance the following chemical equation?

N₂ + H₂ --> NH₃

a. 1, 2, 3

b. 1, 3, 2

c. 1, 3, 3

d. 2, 2, 3

e. 2, 3, 2

2. What are the coefficients needed to balance the following equation?

Fe + 0₂ --> Fe₂0₃

a. 2, 3, 1

b. 2, 6, 2

c. 3, 3, 2

d. 4, 2, 3

e. 4, 3, 2

3. What are the correct coefficients to balance the equation?

Al(NO₃)₃ + H₂S0₄ --> A1₂(S0₄)₃ + HNO₃

a. 2, 2, 3, 3

b. 2, 3, 3, 2

c. 2, 3, 1, 6

d. 3, 2, 4, 3

e. 3, 2, 3, 2

Correct Answers:

1. b

2. e

3. c

I	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

1. A student is ask to balance the chemical equation:

NaOH + H₂S04 --> Na₂SO₄ + H₂0

He does this by putting a 2 after the Na in NaOH. Is this a correct way to balance an equation? Why?

a. No, because that changes the compound NaOH.

b. No, because the 2 should go behind the OH.

c. Yes, this is the easiest way to balance it.

d. Yes, it doesn't matter where the number goes.

e. Yes, because that changes the compound NaOH.

2. A student is asked to balance the chemical equation:

Ca(OH)₂ + HCI --> CaCI₂ + H₂0

He does this by removing the 2 after the OH and after the Cl. Is this the correct way to balance an equation? Why?

a. No, the numbers should be changed to 3's.

b. No, changing the number changes the compounds.

c. No, a 2 should be put in between H and Cl in HCI.

d. Yes, this is the easiest way to balance equations.

e. Yes, it doesn't matter where the numbers go.

Correct Answers:

1. a

2. b

I	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

Analyzing a Titration Experiment

Given: Becky is conducting an experiment in which she measures 30 ml of an acid of unknown concentration. She adds an indicator solution to it, then slowly adds a basic solution of a known concentration from a buret until the acid solution is neutralized. She measure and records the pH of the solution periodically throughout the experiment.

1. What laboratory technique is Becky using?

a. electrolysis

b. distillation

c. titration

d. electrophoresis

2. Which reaction would fit this experiment?

a. CuSO₄ + 2NaCl --> Na₂SO₄ + CuCl₂

b. 2H₂O --> 2H₂ + O₂

c. KOH + HCl --> H₂O + KCl

d. 2H₂O + BaSO₄ --> H₂SO₄ + Ba(OH) ₂

e. All of the reactions listed.

3. All bonds holding atoms together within both the reactants and products in BeckyÕs experiment are of what type?

a. Metallic

b. Ionic

c. Covalent

d. Ionic and Covalent

e. Hydrogen

Correct Answers:

1. c

2. c

3. d

E	Chemistry	Standard: 04
Objective: 01. Identify chemical reactions and how chemical equations describe them.
ILO:

5.0 mL of liquid A are reacted with 5.0 mL of liquid B and 10.6 mL of product C are formed. From this information, has mass been conserved?

a. Yes

b. No

c. CanÕt tell from this information

Explain your answer:

Correct Answer and Scoring Rubric:

5 points possible 2 pts C