Question 4 (Part I)

Equations 1

100

Calcium oxide powder is added to distilled water.

CaO + H₂O → Ca(OH)₂

or

  CaO + H₂O → Ca⁺² + 2OH^-

200

Liquid bromine is shaken with a 0.5 M sodium iodide solution.

Br₂ + 2I^- → 2Br^- + I₂

300

Solid lead (II) carbonate is added to a 0.5 M sulfuric acid solution.

PbCO₃ + H⁺ + HSO₄^- → PbSO₄ + H₂O + CO₂

400

Butanol is burned in air.

C₄H₉OH + 6O₂ → 4CO₂ + 5H₂O

 

500

Methyl ammine is bubbled into distilled water.

CH₃NH₂ + H₂O → CH₃NH₃⁺ + OH^-

Equations 2

100

A mixture of powdered iron (III) oxide and powdered aluminum metal is heated strongly.

Fe₂O₃ + 2Al → Al₂O₃ + 2Fe

200

A 0.2 M barium nitrate solution is added to an alkaline 0.2 M potassium chromate solution.

Ba⁺² + CrO₄^-2 → BaCrO₄

300

A solution of tin (II) nitrate is added to a solution of silver nitrate.

Sn⁺² + 2Ag⁺¹ → Sn⁺⁴ + 2Ag

400

Excess concentrated hydrochloric acid is added to a 1.0 solution of cobalt (II) chloride.

4Cl^-1 + Co⁺² → CoCl₄^-2

500

Carbon monoxide gas is passed over hot iron (III) oxide.

CO + Fe₂O₃ + → CO₂ + 2FeO

or

3CO + Fe₂O₃ + → 3CO₂ + 2Fe

or

iron products that contain reduced iron and oxygen are also accepted

Equations 3

100

A solution of copper (II) chloride is added to a solution of sodium sulfide.

Cu⁺² + S^-2 → CuS

200

A small piece of calcium metal is added to hot distilled water.

Ca + 2H₂O → Ca(OH)₂ + H₂

or

  Ca + 2H₂O → Ca⁺² + 2OH^- + H₂ 

300

Excess concentrated ammonia solution is added to a solution of nickel (II) sulfate.

4NH₃ + Ni⁺² → [Ni(NH₃)₄]⁺²

 

400

Pure solid phosphorus (white form) is burned in air.

P₄ + 5O₂ → 2P₂O₅

500

Solutions of potassium hydroxide and propanoic acid are mixed.

OH^-1 + CH₃CH₂COOH → H₂O + CH₃CH₂COO^-1

Equations 4

100

A piece of copper wire is place in a solution of silver nitrate.

Cu + 2Ag⁺¹ → Cu⁺² + 2Ag

200

Sulfur dioxide gas is bubbled into distilled water.

SO₂ + H₂O  → H₂SO₃

300

Carbon dioxide gas is passed over hot, solid sodium oxide.

CO₂ + Na₂O → Na₂CO₃

400

Excess hydrobromic acid solution is added to a solution of potassium hydrogen carbonate.

H⁺¹ + HCO₃^-1 → H₂O + CO₂

500

A solution of iron (II) chloride is added to a solution of acidified sodium dichromate.

14H⁺¹ + 6Fe⁺² + Cr₂O₇^-2 → 6Fe⁺³ + 2Cr⁺³ + 7H₂O

Equations 5

100

A solution of sodium iodide is added to a solution of lead (II) acetate.

2I^-1 + Pb⁺² → PbI₂

200

Powdered magnesium carbonate is heated strongly.

MgCO₃ → MgO + CO₂

300

Solid cesium oxide is added to water.

Cs₂O + H₂O → 2Cs⁺¹ + 2OH^-1

400

Solid sodium hydrogen carbonate is strongly heated.

2NaHCO₃ → Na₂O + 2CO₂ + H₂O

or

2NaHCO₃ →Na₂CO₃ + CO₂ + H₂O

500

A drop of potassium thiocyanate solution is added to a solution of iron (III) nitrate.

SCN^-1 + Fe⁺³ → [Fe(SCN)]⁺²

or

any coordinated SCN ions 1 through 6