Daily Practice

GCSE Science

8th January 1991

5 questions · GCSE · 584 questions in this band

1
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
2
Reactivity, Acids and Salts
Define oxidation in terms of electrons.
3
Electrolysis
In the industrial extraction of aluminium, explain why the carbon anodes need to be replaced regularly.
4
Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
5
Exothermic and Endothermic Reactions
State the energy transfer that occurs during an exothermic reaction.

You are looking at an earlier sheet. Today's sheet is the one that adds a day.

Your run is kept in this browser only, and there is no account.

Any date always gives the same five questions, so a sheet can be set again or shared. All of January 1991, including the monthly compilation PDF.