Daily Practice

GCSE Science

13th December 1992

5 questions · GCSE · 584 questions in this band

1
Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
2
Chemical Changes
State the name given to a reaction in which a substance loses electrons.
3
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
4
Electrolysis
Aqueous copper sulfate solution is electrolysed using inert graphite electrodes. State the products formed at (a) the cathode and (b) the anode, giving a reason for each.
5
Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.

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