Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
22nd April 2023
- 1Electrolysis
State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.
- 2Energy Changes
Give one everyday example of an endothermic process.
- 3Exothermic 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.
- 4Bond Energies, Cells and Fuel Cells
State the only substance produced when a hydrogen fuel cell reacts pure hydrogen with pure oxygen.
- 5Rate and Extent of Chemical Change
A reaction between calcium carbonate and hydrochloric acid produces 72 cm3 of carbon dioxide gas in 30 seconds. Calculate the mean rate of reaction.
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