Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
28th March 2021
- 1Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
- 2Chemical Changes
State the name given to a reaction in which a substance loses electrons.
- 3Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...
- 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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