Midterm #1 review

Naming compounds

100

Name this formula: Fe₂O₃

Iron (III) oxide

200

Name this formula: PCl₅

Phosphorous pentachloride

300

Name the following oxyacid: H₂SO₄

Sulfuric acid

Writing formulas for compounds

100

What is the formula for carbon dioxide?

CO₂

200

Write the formula and name for a compound containing the following: Na⁺ and CO₃^2-

Na₂CO₃

300

What is the formula for ammonium sulfate?

(NH₄)₂SO₄

Molecular/empirical formulas + percent comp

100

Identify the empirical formula for the following: Al_0.67O₁

Al₂O₃

200

A compound has empirical formula NO₂ and a measured molar mass of 92.0 g/mol. Find its molecular formula.

N₂O₄

300

Find the percent composition of carbon in the following compound: CO₂

27.3%

Conversions

100

Calculate the molar mass of the following compound: Na₂SO₂

110.04 g/mol

200

How many moles are in 25.0 g of NaCl?

0.428 moles

300

Calculate the number of carbon atoms in 3.12 mol of C₃H₁₀

5.64 x 10²⁴ atoms C

Balancing equations + predicting products + redox

100

Balance the following chemical equation and predict its products: CaCl₂ (aq) + Na₂CO₃ (aq) →

CaCl₂ (aq) + Na₂CO₃ (aq) → CaCO₃ (s) + 2NaCl (aq)

200

Write the complete ionic AND net ionic equation for the following reaction: AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

Complete ionic:

Ag⁺ (aq) + NO₃^- (aq) + Na⁺ (aq) + Cl^- (aq) → AgCl (s) + Na⁺ (aq) + NO₃^- (aq)

Net ionic: Ag⁺ (aq) + Cl^- (aq) → AgCl (s)

300

Given the equation below, identify: a) the element that is reduced, b) the element that is oxidized, c) the reducing agent, and d) the oxidizing agent.

Zn (s) + CuSO₄ (aq) → ZnSO₄ (aq) + Cu (s)

Cu: +2 → 0 (reduced) (oxidizing agent)

Zn: 0 → +2 (oxidized) (reducing agent)