Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
23rd September 2003
- 1Concentration, Yield and Atom Economy
Calculate the concentration in moles per cubic decimetre of a solution containing 0.5 mol in 250 cubic centimetres.
- 2Chemical Changes
State the name given to a reaction in which a substance loses electrons.
- 3Reactivity, Acids and Salts
Name the salt made from zinc oxide and nitric acid.
- 4Electrolysis
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.
- 5Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
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