Daily Practice

GCSE Science

9th August 1991

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Give the formula for percentage yield.
2
Chemical Changes
State the name given to a reaction in which a substance loses electrons.
3
Reactivity, Acids and Salts
Give the ionic equation for neutralisation.
4
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.
5
Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.

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 August 1991, including the monthly compilation PDF.