Class Problem Set

Calculate the percent composition of the compound H₂S.

From the percent composition of the compound H₂S calculate the amount of sulfur in 3.54g. of H₂S.

Determine the molecular formula for the following compound: 50.7% C; 4.2% H; 45.1% O; molar mass = 142 g/mol

You find that 7.36 g. of a compound has decomposed to give 6.93 g. of oxygen. The only other element in the compound is hydrogen. If the molar mass of the compound is 34.0 g/mol, what is its molecular formula?

Calculate the percent composition of the compound (NH₄)₂C₂O₄.

Balance: SO₂      +      O₂      →      SO₃

Balance: Fe₂O₃      +      H₂      →      Fe      +      H₂O

Balance: P      +      O₂      →      P₄O₁₀

Balance: Al      +      N₂      →      AlN

Write a balanced chemical equation for the following reaction:

“Solid iron metal and chlorine gas react to form solid iron(III) chloride.”

Write the balanced equation for the following reaction:

“Solid aluminum carbonate decomposes to form solid aluminum oxide and carbon dioxide gas.”

Name : HCl (acid)

Name : AgCN

Name : NaI

Name : H₂S

Name : NaHSO₄

Name: XeF₄

Formula: calcium chlorate

Formula: sodium hypochlorite

Formula: sulfur dioxide

Formula: tin(IV) acetate

Write the balanced equation: Heating copper(II) sulfide in the presence of diatomic oxygen produces pure copper and sulfur dioxide gas.

Write the balanced equation: When heated, baking soda (sodium hydrogen carbonate) decomposes to form the products sodium carbonate, carbon dioxide, and water.

Write the balanced equation: Solid magnesium reacts with aqueous silver nitrate to form solid silver and aqueous magnesium nitrate.

Name of acid: HCl

Name of acid: HNO₃

Name of acid: H₂S

Name of acid: H₂CO₃

Formula of acid: Chloric acid

Formula of acid: Hypochlorous acid

Formula of acid: Oxalic acid

Write the balanced equation for the formation of magnesium nitride from its elements. Describe what type of reaction it is.

Classify and balance: Al(OH)₃ → Al₂O₃ + H₂O

Classify and balance: Li + O₂ → Li₂O

Complete and balance: Al + Cl₂ → 

Complete and balance: MgCl₂ → 

Balancy and identify the type: Hf + N₂ → Hf₃N₄

Balance equation: Ag₂O(s)    →

Use the activity series of metals to write a balanced chemical equation for the following single-replacement reactions: Au(s) + KNO₃(aq) →

Use the activity series of metals to write a balanced chemical equation for the following single-replacement reactions: Zn(s) + AgNO₃(aq) →

Use the activity series of metals to write a balanced chemical equation for the following single-replacement reactions: Al(s)  + H₂SO₄(aq) →

Complete the equation: K(s) + H₂SO₄(aq) →

Complete the equation: Pb(NO₃)₂(aq) + 2NaI(aq) →

Description and balance: N₂O₃(g) + H₂O(l) → HNO₂(aq)

Balance and identify: Hf   +   N₂   →   Hf₃N₄

Balance and identify:  Mg   +   H₂SO₄   →   MgSO₄   +   H₂

Balance and identify: C₂H₆   +   O₂   →   CO₂   +   H₂O

Balance and identify: Pb(NO₃)₂   +   NaI   →   PbI₂   +   NaNO₃

Balance and identify: Fe   +   O₂   →   Fe₃O₄

Write the word equation for the reaction that generates water and molecular oxygen from hydrogen peroxide.

Give the word equation for the reaction that generates sulfur trioxide from sulfur dioxide and molecular oxygen.

Interpret the following skeleton equation: Cu(s) + O₂(g) → CuO(s)

Write the skeleton equation for the following reaction: when aqueous hydrochloric acid is mixed solid sodium hydrogen carbonate the products formed are aqueous sodium chloride, liquid water, and carbon dioxide gas.

Rewrite the following word equation as a balanced chemical equation: 

aluminum sulfate + calcium hydroxide   →  aluminum hydroxide + calcium sulfate

Rewrite the following word equation as a balanced chemical equation: 

phosphoric acid + sodium hydroxide     →     sodium phosphate + water

Complete and balance this equation for a combination reaction:

2 Be   +   O₂   → 2 BeO

Complete and balance the following decomposition reaction:

2 HI → H2 + I2

Using the same table on p. 333, describe the products of the reaction between aqueous bromine and aqueous sodium iodide.

Using the activity series on p. 333, describe what would happen when aqueous bromine is allowed to react with aqueous sodium chloride.

If hydrogen cyanide is a gas, decide whether the reaction between aqueous sodium cyanide and aqueous sulfuric acid will occur. Write an equation to show this reaction.

If water is formed, decide whether the reaction between aqueous calcium hydroxide and aqueous hydrochloric acid will occur. Write an equation to show this reaction.

Predict the products for the complete combustion of the compound benzene (C₆H₆).

Aqueous solutions of iron(III) chloride and potassium hydroxide are mixed. A precipitate of iron(III) hydroxide forms. Write the complete ionic equation for this reaction.

Write the net ionic equation for the reaction between sulfuric acid and sodium hydroxide to form water and sodium sulfate.

Aqueous solutions of iron(III) chloride and potassium hydroxide are mixed. A precipitate of iron(III) hydroxide forms. Write the balanced net ionic equation for this reaction.

Predict whether a precipitate will form when the following aqueous solutions are mixed. Write a net ionic equation for the reaction.

Predict whether a precipitate will form when the following aqueous solutions are mixed. Write a net ionic equation for the reaction.