Chem 1314 Exam 2 Review

Nomenclature

100

Name the following compound: N₂O₅

Dinitrogen pentoxide

200

Write the formula for the following compound: nickel (III) nitride

NiN

300

Name the compound: HIO₃

iodic acid

400

Name this compound: HF

hydrofluoric acid  

500

Name this compound: CuSO₄ · 5H₂O

copper(II) sulfate pentahydrate

Mole calculations

100

How many grams are in 4.5 moles of LiO₂?

175.23 grams

200

How many moles of sulfate ions are in 4.20 moles of aluminum sulfate, Al₂(SO₄)₃?

12.6 moles

300

What is the percent composition of Nitrogen in N₂S₂?

30.4%

400

The molecular mass of Benzene, an important industrial solvent, is 78 g/mol and its empirical formula is CH. What is the molecular formula of Benzene?

C₆H₆

500

Freons are gaseous compounds used in refrigeration. A particular freon consists of 9.93% carbon, 58.6% Chlorine, and 31.4% Fluorine by mass. What this freons empirical formula?

CCl₂F₂

Chemical Reactions

100

Identify the type of reaction displayed: 

Zn+2HCl → ZnCl₂+H₂

Single - Replacement

200

Classify the following as a strong, weak, or non-electrolyte: Mg(OH)₂

Weak Electrolyte

300

Predict whether these two compounds, when mixed together, will cause a reaction to occur: 

K₂CO₃(aq) + BaCl₂(aq) →

A reaction occurs; 

K₂CO₃(aq) + BaCl₂(aq) → KCl(aq) + BaCO₃(s)

400

Balance the following equation: 

KClO₃ → KCl + O₂

2KClO₃ → 2KCl + 3O₂

500

What is the net-ionic equation for the following reaction:

NH₄OH(aq) + HCl(aq) →

NH₄OH(aq) + H⁺(aq) → NH₄⁺(aq) + H₂O(l)

More Chemical Reactions

100

What is the oxidation state of sulfur in the sulfate ion, SO₄²⁻

+6

200

Write the net ionic equation for the following:

2KCl (aq) + Pb(NO₃)₂ (aq) -> 2KNO₃ (aq) + PbCl₂ (s)

2Cl^-(aq) + Pb²⁺(aq) → PbCl₂(s)

300

Identify the reducing agent in the following reaction:

2NaClO₃(aq) + 3SO₂(g)→2NaCl(aq) + 3SO₃(g)

SO₂ 

400

Identify the substance which is reduced in the following equation: 

CuO(s)+H₂(g)→Cu(s)+H₂O(l)

CuO (specifically Cu in CuO)

500

Balance the following equation: 

___Na₂CO₃ + ___HCl → ___NaCl + ___H₂O + ___CO₂ 

Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂

Stoichiometry

100

Considering the equation below, what is the mole ratio of aluminum to chlorine? What is the mole ratio of aluminum to aluminum chloride?

2Al + 3Cl₂ → 2AlCl₃

• Al:Cl₂ → 2:3

• Al:AlCl₃ → 1:1 

200

A chemist expects to produce 50.0 g of a compound in a reaction (theoretical yield). If the percent yield is 80%, what is the actual yield collected in grams?  

40.0g

300

If 2.00 mol HCl reacts with 1.50 mol Ca(OH)₂, what is the limiting reagent?

2HCl+Ca(OH)₂→CaCl₂+2H₂O

HCl

400

After the complete reaction of 0.500 mol HCl with 0.300 mol KOH, how much excess reactant remains?

HCl(aq) + KOH(aq) → H₂O(l) + KCl(aq)

0.200 mol HCl

500

How many grams of iron (Fe) are needed to react with oxygen gas to produce 2.00 moles of iron(III) oxide (Fe₂O₃)?

223.4 grams Fe