AQA GCSE Chemistry Topic 5 Energy Changes
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11 Terms
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Law about energy?
Energy is always conserved
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Exothermic
Releases energy
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Endothermic
Absorbs energy
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Decomposition endothermic or exothermic?
Endothermic
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Define activation energy
energy needed to start a reaction
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Energy transfer when breaking bonds?
In
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Energy transfer when making bonds?
Out
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How do fuel cells create a potential difference?
Oxidise electrochemically
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Two advantages of hydrogen?
Less pollutants and high energy store
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Disadvantages to rechargeable energy stores?
Made of toxic material, low energy store and expensive
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Only waste product of using hydrogen?
Water
Note 
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