Energy changes GCSE questions
Cover the answers and try these Energy changes checks first. The full quiz in the app includes hints.
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Practice questions
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An exothermic reaction
Ammonium nitrate dissolving and cooling the tube is
Activation energy is
On an exothermic profile, products are
Common mistakes
- The system can get colder while the reaction needs heat. Endothermic does not mean no energy involved. Do not say energy is created.
- Do not draw the product line at the same height as the peak. The peak is the activated state, not the product. Missing labels lose easy marks.
- Using 2HCl as one H–Cl bond is a classic error. Two molecules means two H–Cl bonds. Bond breaking is always endothermic.
- A dead cell is not out of electrons. The reactants have been used up. Two identical metals will not give a useful voltage.
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