Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
17th August 2026
- 1Concentration, Yield and Atom Economy
Why do companies prefer reactions with a high atom economy?
- 2Chemical Changes
State the name given to a reaction in which a substance loses electrons.
- 3Reactivity, Acids and Salts
State what is observed when magnesium ribbon is added to copper sulfate solution.
- 4Electrolysis
Molten zinc chloride, ZnCl2, is electrolysed using inert electrodes. Write the half equation for the reaction at (a) the cathode, and (b) the anode.
- 5Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
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