Daily Practice

GCSE Science

21st August 1992

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 what is meant by the activation energy of a reaction.
3
Bond Energies, Cells and Fuel Cells
State whether forming a new chemical bond requires energy or releases energy.
4
Rate and Extent of Chemical Change
State the four factors that can increase the rate of a chemical reaction.
5
Rates of Reaction
Explain why using a light sensor and data logger is more reliable than timing by eye in the disappearing cross practical.

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