Daily Practice · GCSE Science

Daily Practice - GCSE Science

28th December 1996

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
State the name given to a reaction in which a substance loses electrons.
3
Reactivity, Acids and Salts
Define oxidation in terms of electrons.
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.

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