Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
11th April 2018
- 1Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
- 2Electrolysis
State the two materials commonly used as inert electrodes in electrolysis, and explain why they must be inert.
- 3Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
- 4Exothermic 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.
- 5Bond Energies, Cells and Fuel Cells
State the only substance produced when a hydrogen fuel cell reacts pure hydrogen with pure oxygen.
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