4 marksFoundation5.1.1.1 Atoms, elements and compounds5.1.1.2 Mixtures
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 marksFoundation5.4.2.2 Neutralisation of acids and salt production5.4.2.1 Reactions of acids with metals
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] 3 marksFoundation5.5.1.1 Energy transfer during exothermic and endothermic reactions
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] 4 marksFoundation5.3.1.2 Relative formula mass
Relative atomic masses
(Ar): H = 1, C = 12, O = 16, Mg = 24, Cl = 35.5
.1Calculate the relative formula mass
(Mr) of water,
H2O. .2Calculate the
Mr of carbon dioxide,
CO2. .3Calculate the
Mr of magnesium chloride,
MgCl2. 4 marksFoundation5.1.2.5 Group 1
A teacher adds a small piece of lithium to a trough of water containing universal indicator.
.1Give two observations the students would see.
[2 marks] .2Complete the word equation: lithium + water → lithium hydroxide + ______
[1 mark] .3The teacher repeats the demonstration with potassium. Predict how the reaction compares.
[1 mark] 