CHEM1314 SI Exam 2 Review

Naming

100

Name: Fe(NO₃)₃

iron(III) nitrate

200

Write the formula for:
copper(II) phosphate

Cu₃(PO₄)₂

300

Name:
HClO₃ (aq)

chloric acid

400

Write the formula for:
aluminum sulfate octahydrate

Al₂(SO₄)₃ · 8H₂O

500

Name:
(NH₄)₂Cr₂O₇

ammonium dichromate

The Mole / Empirical & Molecular

100

How many moles are in 3.01 × 10²³ molecules of CO₂?

0.500 mol

200

How many atoms of oxygen are in 0.75 mol H₂O?

4.52×10²³ atoms O

300

How many grams are in 2.50 mol Na₂CO₃?

MM ≈ 105.99 g/mol
= 265 g

400

How many moles of Cl⁻ are in 3.00 mol AlCl₃?

9.00 mol Cl⁻

500

A compound is 58.80 % carbon, 11.54 % hydrogen, and 29.66 % germanium by mass. What is its empirical formula?

a). C₄H₇Ge

b). C₁₂H₂₈Ge

c). C₁₀H₂₁Ge₂

d). C₆H₁₄Ge

b. C₁₂H₂₈Ge

Chemical Equation / Reactions

100

Identify reaction type:
Zn + 2 HCl → ZnCl₂ + H₂

Single Replacement

200

Balance:
___ KClO₃ → ___ KCl + ___ O₂

2 KClO₃ → 2 KCl + 3 O₂

300

___C₂H₆ +___O₂ → ___CO₂ +___ H₂O

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

400

What is the net ionic equation for the reaction:

Na₂S _(aq) + Ca(C₂H₃O₂)_2 (aq) ---> CaS_(s) + 2 NaC₂H₃O_{2 (aq)}

a). Ca²⁺ _(aq) + S^2- _(aq) ---> CaS _(s)

b). 2 Na⁺_(aq) + S^2-_(aq) + Ca²⁺_(aq) + 2 C₂H₃O₂^-_(aq) ---> CaS_(s) + 2 Na⁺_(aq) + 2 C₂H₃O₂^-_(aq)

c). Na⁺_(aq) + C₂H₃O₂^-_(aq) ---> NaC₂H₃O_{2 (aq)}

d). 2 Na⁺_(aq) + 2 C₂H₃O₂^-_(aq) ---> 2 Na⁺_(aq) + 2 C₂H₃O₂^-_(aq)

a). Ca²⁺ _(aq) + S^2- _(aq) ---> CaS _(s)

500

In which one of the following equations will a precipitate NOT be formed?

a). 2 KOH + Sr(C₂H₃O₂)₂ ---> 2 KC₂H₃O₂ + Sr(OH)₂

b). MgSO₄ + Al(NO₃)₃ ---> Mg(NO₃)₂ + Al₂(SO₄)₃

c). K₂CO₃ + BaBr₂ ---> 2 KBr + BaCO₃

d). Hg₂(NO₃)₂ + 2 NH₄Br ---> Hg₂Br₂ + 2 NH₄NO₃

b

REDOX Reactions

100

Assign oxidation state of sulfur in SO₄²⁻

+6

200

Zn + Cu²⁺ → Zn²⁺ + Cu

Which element is oxidized?

Zn

300

Assign oxidation state of Mn in MnO₂.

+4

400

2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂ 

Identify the oxidizing agent.

Fe₂O₃

500

2 Al + 3 CuO → Al₂O₃ + 3 Cu

What is the oxidizing agent?

CuO

Stoichiometry

100

2 H₂ + O₂ → 2 H₂O

How many moles H₂O form from 3.0 mol H₂

3.0 mol H₂O

200

N₂ + 3 H₂ → 2 NH₃

How many grams NH₃ form from 14.0 g N₂?

17.0 g NH₃

300

2 Na + Cl₂ → 2 NaCl

If 5.0 mol Na react with 2.0 mol Cl₂, which is limiting?

Cl₂

400

How many grams of sodium phosphate are required to completely consume 26.5 g of copper(I)nitrate according to the following balanced equation?

Na₃PO₄ (aq) + 3 CuNO₃ (aq) --> Cu₃PO_4(s) + 3 NaNO₃

Molecular Weights:

Na₃PO₄ = 163.94 g/mol

CuNO₃ = 125.55 g/mol

a). 104 g

b). 34.6g

c). 11.5 g

d). 6.76 g

c). 11.5

500

N₂ + 3 H₂ → 2 NH₃

5.00 g N₂ reacts with 2.00 g H₂.

What's the theoretical yield?

6.08 g