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Tutor HuntTest QuestionsChemistry QuestionsYear 10 Chemistry Questions

 

Reaction Profiles (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Reaction Profiles' from the broader topic Energy Changes. The test is geared towards the AQA exam board style syllabus.
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When bond energies are used to calculate overall energy change, the correct approach is to
On a reaction profile graph, which vertical distance corresponds to the overall energy change (?H) for the reaction?
Which description of a reversible reaction at dynamic equilibrium is correct?
A reaction profile for a catalysed reaction compared with the uncatalysed one will show
When bond energies are: C—H = X, C—C = 347, O=O = 498, C=O = 805, O—H = 464, and the overall reaction energy is -2219 kJ per mole (exothermic), which algebraic procedure finds X?
If a reaction profile shows the products at a lower energy level than the reactants, this indicates the reaction is
Which of the following is true when a catalyst is used in a reaction?
If a reaction profile has reactants at 150 kJ and products at 40 kJ, the overall energy change ?H is
On a reaction profile, where is the activated complex (transition state) located?
When comparing two reaction profiles, the one with the lower activation energy will usually have
In bond-energy terms, why do exothermic reactions release energy?