Daily Practice

GCSE Science

20th December 1972

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Give the formula for atom economy.
2
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
3
Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
4
Electrolysis
Concentrated sodium chloride solution (brine) is electrolysed using inert electrodes. State the products formed at the cathode and at the anode.
5
Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.

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 December 1972, including the monthly compilation PDF.