Daily Practice

GCSE Science

18th December 1991

5 questions · GCSE · 584 questions in this band

1
Moles, Formulae and Equations
State the value of the Avogadro constant and what it counts.
2
Concentration, Yield and Atom Economy
Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
3
Chemical Changes
State the pH value of a neutral solution.
4
Reactivity, Acids and Salts
Define oxidation in terms of electrons.
5
Electrolysis
In the industrial extraction of aluminium, explain why the aluminium oxide is dissolved in molten cryolite rather than melted on its own.

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 1991, including the monthly compilation PDF.