This document contains descriptions and diagrams of several chemical reactions and experiments: 1) A reaction between magnesium and copper chloride produces magnesium chloride and copper. 2) Precipitation of silver chloride is achieved through a reaction of silver nitrate and sodium chloride. 3) Copper(II) oxide reacts with sulfuric acid to produce copper(II) sulfate and water. 4) Heating zinc carbonate produces zinc oxide and carbon dioxide, and the gas changes limewater to chalky.

1. QUICK REVISION
• DRAW DIAGRAMS

2. Heat of displacement of metals
Reaction
equation Mg + CuCl2  MgCl2 + Cu
Observations
Diagram
Magnesium and copper(II)
chloride solution
Magnesium dissolves
Blue solution decolourise

3. Preparation of insoluble salt
Aim
equation AgNO3 + NaCl  AgCl + NaNO3
Observations
Diagram
To prepare silver chloride salt
White precipitate formed

4. Preparation of soluble salt using
acid and oxide metal
Aim
equation CuO + H2SO4  CuSO4 + H2O
Observations
Diagram
To prepare copper(II) sulphate
Copper(II) oxide dissolve
Blue solution formed
50 cm3
sulphuric acid
0.5 mol dm-3
Excess copper(II)
oxide powder

5. Heating of carbonate metal
Reaction
equation ZnCO3  ZnO + CO2
Observations
Diagram
Heating zinc carbonate
Residue is yellow(hot) and
white (cold)
Gas changed lime water chalky

6. To determine reactivity of metals with
oxygenReaction
equation 2Zn + O2  2ZnO
Observations
Diagram
Zinc with oxygen
Zinc burns to leave white
powder
Potassium
manganate(VII)
Glass wool
Metal
powder
Heat (1)Heat (2)

7. Ethanol  ethene
Catalyst
equation C2H5OH  C2H4 + H2O
Gas
ethene
water
Glass
wool
Soaked in
ethanol
Porcelain chips
Heat
Observations
Diagram
Hot porcelain chips
Gas collected decolourise
brown bromine water