Daily Practice

GCSE Science

27th December 1989

5 questions · GCSE · 584 questions in this band

1
Reactivity, Acids and Salts
Explain the difference between a strong acid and a concentrated acid.
2
Electrolysis
Molten zinc chloride, ZnCl2, is electrolysed using inert electrodes. Write the half equation for the reaction at (a) the cathode, and (b) the anode.
3
Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
4
Exothermic 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.
5
Bond 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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