4 marksFoundation
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] 4 marksFoundation
A student adds marble chips to hydrochloric acid and collects the carbon dioxide in a gas syringe.
.1Calculate the mean rate of reaction in the first 30 seconds.
[2 marks] .2Give the earliest time in the table by which the reaction had stopped.
[1 mark] .3Describe how the rate changes during the reaction.
[1 mark] 3 marksFoundation
Crude oil is a mixture of hydrocarbons.
.1Define the term hydrocarbon.
[1 mark] .2Butane has 4 carbon atoms. Write the formula of butane.
[1 mark] .3Which fraction is used as fuel for aircraft?
[1 mark] 4 marksFoundation
Some gases in the atmosphere are greenhouse gases.
.1Which two are greenhouse gases? Tick two boxes.
[2 marks] .2Give two human activities that increase the amount of methane in the atmosphere.
[2 marks] 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] 