Daily Practice

GCSE Science

5th September 1985

5 questions · GCSE · 584 questions in this band

1
Energy Changes
Explain, in terms of bonds, why breaking bonds is an endothermic process.
2
Exothermic and Endothermic Reactions
State the energy transfer that occurs during an exothermic reaction.
3
Bond Energies, Cells and Fuel Cells
State one factor that affects the size of the voltage produced by a chemical cell.
4
Rate and Extent of Chemical Change
State two units that the rate of a reaction can be measured in.
5
Rates of Reaction
A tangent drawn to a volume-time graph at 15 seconds passes through the points (5 s, 6 cm3) and (25 s, 66 cm3). Calculate the rate of reaction at 15 seconds.

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