Daily Practice · GCSE Science

Daily Practice - GCSE Science

26th December 1993

5 questions · GCSE · 584 questions in this band

1
Energy Changes
A reaction profile shows the reactants at 150 kJ and the peak (activation energy point) at 195 kJ. Calculate the activation energy.
2
Exothermic and Endothermic Reactions
State the energy transfer that occurs during an endothermic reaction.
3
Bond Energies, Cells and Fuel Cells
State the two substances that react inside a hydrogen fuel cell.
4
Rate and Extent of Chemical Change
State what is meant by a catalyst.
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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