Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
26th October 2025
- 1Chemical Changes
State the name given to a reaction in which a substance loses electrons.
- 2Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
- 3Electrolysis
State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.
- 4Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
- 5Exothermic and Endothermic Reactions
A student heats solid copper carbonate strongly in a test tube, and it breaks down into copper oxide and carbon dioxide. Heating must be continued throughout the reaction for it to keep going. State whether this thermal decomposition reaction is exothermic or endothermic, and explain your reasoning.
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