Daily Practice

GCSE Science

20th October 1986

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
Explain, in terms of the reaction pathway, why adding a catalyst increases the rate of a reaction without changing the overall energy change of the reaction.
3
Bond Energies, Cells and Fuel Cells
State whether breaking a chemical bond requires energy or releases energy.
4
Rate and Extent of Chemical Change
Explain, using collision theory, why increasing the concentration of a reactant in solution increases the rate of a 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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