Chapter 4

Molarity and Dilution

100

Identify the solute and the solvent in a solution that is prepared by dissolving molecular iodine in ethanol, C₂H₅OH.

Solute: iodine
Solvent: ethanol, C₂H₅OH.

200

If 25.0 mL of a 2.19 M solution are diluted to 72.8 mL, what is the final concentration?

0.752 M

300

What are the molar concentrations of each of the ions present in a 5M aqueous solution of Manganese (II) chlorate?

Mn²⁺ : 5M
2ClO₃^- : 10M

400

A 4.691 g sample of MgCl₂ is dissolved in enough water to give 750. ml of solution. What is the magnesium ion concentration in this solution?

0.0657 M

500

How much 0.115 M KI solution, in Liters, is required to completely precipitate the Pb²⁺ in 0.104L of 0.225M Pb(NO₃)₂?

2KI (aq) + Pb(NO₃)₂ (aq) ⟶ PbI₂ (s) + 2KNO₃ (aq)

0.407 L KI

Solubility

100

True or False: NaCl is soluble in water?

True

200

True or False: BaSO₄ is soluble in water

False

300

Which of the following is soluble in water?
a. Ca₃(PO₄)₂
b. AlPO₄
c. Both are soluble
d. None are soluble

d. None are soluble

400

Hg₂Cl₂ is _____ in water and Na₂S is _____ in water.

a. soluble, insoluble
b. insoluble, soluble
c. soluble, soluble
d. insoluble, insoluble

b. insoluble, soluble

500

In lab, you are working with the following compounds:

I. AgBr             II. AgCl
III. AgNO₃          IV. Ag₂S

Which of the following should be soluble in water?
a. I and II
b. III and IV
c. III only
d. II and IV only

c. III only (AgNO₃)  

Redox

100

Oxidation is _____ of electrons

a. gain
b. loss
c. balancing
d. creating

b. loss

200

True or False: The reactant that donates electrons is the oxidizing agent.

False

300

What is the reducing agent in this reaction:

3Ag⁺ + Al ⟶ 3Ag + Al³⁺

Al

400

Identify the reducing agent and oxidizing agent for the reaction below:

Zn + 2H⁺ ⟶ Zn²⁺+ H₂

Reducing agent: Zn
Oxidizing agent: H⁺

500

Identify what is being reduced in this reaction

C + O₂ ⟶ CO₂

a. O
b. C
c. CO₂
d. C and O

a. O

Oxidation Numbers

100

Oxygen in compounds usually have an oxidation state of

a. 0
b. 6
c. -2
d. 4

c. -2

200

All of the following elements have an oxidation state of zero except for?

a. O₂ (g)
b. Ne (g)
c. Fe²⁺ (aq)
d. Ca (s)

c. Fe²⁺ (aq)

300

What is the oxidation number of S in K₂SO₄?

a. 1
b. -2
c. 4
d. 6

d. 6

400

What is the oxidation number of the phosphorus atom in Na₃PO₃?

3+

500

Find the oxidation number of each element in H₂PO₄^-

H: +1
P: +5
O: -2

Reactions

100

True or False: H₂SO₄ is a strong acid

True

200

Predict the products of the following single replacement reaction: Fe(s) + CuSO₄ (aq)

a. Cu (s) + FeSO₄ (aq)
b. No reaction occurs
c. CuS (s) + Fe₂SO₄ (aq)
d. FeCuSO₄ (aq)

a. Cu (s) + FeSO₄ (aq)

300

Ethanol can be used as a fuel source in an alcohol lamp. The formula for ethanol is C₂H₅OH. Write the balanced equation for the combustion of ethanol.

C₂H₅OH (l) + 3O₂ (g) → 2CO₂ (g) +3H₂O (g)

400

What will occur when solutions of ZnSO₄ (aq) and MgCl₂ (aq) are mixed?

No precipitate will form

500

A solution of lead (II) nitrate and a solution of potassium iodide are mixed to create a new solution. Write the net ionic equation for this reaction below. Include states.

Pb²⁺ (aq) + 2I^- (aq) ⟶ PbI₂ (s)