4 marksFoundation
Magnesium reacts with oxygen to form magnesium oxide, an ionic compound.
The electron structure of magnesium is 2,8,2 and of oxygen is 2,6.
.1Describe what happens to the electrons when magnesium reacts with oxygen.
[2 marks] .2What are the charges on the ions in magnesium oxide?
[1 mark] .3Name the type of force that holds the ions together.
[1 mark] 4 marksFoundation
Some substances are listed below.
Copper, carbon dioxide, air, sodium chloride.
.1Which substance is an element?
[1 mark] .2Which substance is a mixture?
[1 mark] .3Give the number of different elements in the formula
CaCO3. .4A student has a mixture of sand and water. Choose the best method to get the sand.
[1 mark] 3 marksFoundation
Chemical reactions can transfer energy to or from the surroundings.
.1Which two reactions are exothermic? Tick two boxes.
[2 marks] .2Give one everyday use of an endothermic reaction.
[1 mark] 3 marksFoundation
Acids react with metals, bases and carbonates to make salts.
.1Name the salt made when magnesium oxide reacts with hydrochloric acid.
[1 mark] .2Name the salt made when sodium hydroxide reacts with sulfuric acid.
[1 mark] .3Name the gas produced when calcium carbonate reacts with hydrochloric acid.
[1 mark] 4 marksFoundation
Molten zinc chloride is electrolysed using inert electrodes.
.1Explain why the zinc chloride must be molten.
[2 marks] .2Name the product at the cathode.
[1 mark] .3Name the product at the anode.
[1 mark] 