Energy Changes Exam Questions
Questions on exothermic and endothermic reactions, reaction profiles, bond energy calculations, chemical cells, batteries, and fuel cells. Download free past paper questions organised by topic with mark schemes.
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Frequently Asked Questions
What is exothermic and endothermic GCSE?
Exothermic reactions release energy to surroundings (temperature increases). Examples: combustion, neutralisation. Endothermic reactions take in energy from surroundings (temperature decreases). Examples: thermal decomposition, photosynthesis.
How do you draw reaction profiles GCSE?
X-axis = progress of reaction. Y-axis = energy. For exothermic: products lower than reactants. For endothermic: products higher than reactants. The hump shows activation energy.
How do you calculate bond energy change?
Energy change = Energy in (bonds broken) - Energy out (bonds formed). If the answer is positive = endothermic. If negative = exothermic.
Are fuel cells Triple Science only?
Yes, fuel cells and chemical cells in detail are Triple Science only content. Combined Science students only need to know basic exothermic/endothermic concepts.
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