Daily Practice

GCSE Science

10th March 1992

5 questions · GCSE · 584 questions in this band

1
Energy Changes
A reaction profile shows the reactants at 220 kJ and the products at 340 kJ. State whether the reaction is exothermic or endothermic.
2
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.
3
Bond Energies, Cells and Fuel Cells
State the only substance produced when a hydrogen fuel cell reacts pure hydrogen with pure oxygen.
4
Rate 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.
5
Rates of Reaction
In the gas-volume required practical measuring how concentration affects rate, state one variable that should be controlled.

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