Module 5: Equilibrium and Acid Reactions Revision

Combustion reactions are...

• reversible.

• irreversible.

The dissolution of ionic compounds in water occurs because water molecules are:

• neutral

• polar

• covalently bonded

• uncharged

All solutions are:

• homogenous mixtures

• heterogenous mixtures

• precipitates

• pure compounds

All solutions are

• coloured

• colourless

• clear

• concentrated

When an ionic compound is placed in water or an aqueous solution, the breaking up of its ionic lattice is called:

• sedimentation

• ionisation

• precipitation

• dissolution

What type of chemical reaction is shown in this photograph?

• sedimentation

• ionisation

• precipitation

• removal of cycad toxins

From which of the following solutions are you likely to get little or no precipitate formed?

• Ammonium nitrate and sodium carbonate

• Silver nitrate and potassium bromide

• Sodium hydroxide and magnesium chloride

• Copper sulphate and barium chloride

A test tube contains a mixture of the following ions: Cu²⁺, Mg²⁺, Pb²⁺ and Ag⁺. Dilute hydrochloric acid is added and two of the ions precipitate out as chloride salts. Those two ions would most likely be:

• Cu²⁺ , Pb²⁺

• Cu²⁺, Ag⁺

• Mg²⁺, Ag⁺

• Pb²⁺ , Ag⁺

When lead nitrate and sodium sulphate are mixed the result would be:

• A precipitate of lead sulphate.

• A precipitate of sodium nitrate.

• A precipitate of lead nitrate.

• No precipitate would form.

Statement about solubility is correct?

• All substances become more soluble as temperature increases.

• Only gases become more soluble as temperature increases.

• Solubility varies with temperature.

• Solids become less soluble as temperature increases.