Daily Practice

GCSE Science

18th February 1989

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
2
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
3
Reactivity, Acids and Salts
Define oxidation in terms of electrons.
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 February 1989, including the monthly compilation PDF.