Year 10 - Energy Changes in Chemical Reactions
- Created by: Alice Cullen
- Created on: 07-01-17 14:40
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Exothermic and Endothermic Reactions:
- When chemical reactions occur, energy is transferred to or from the surroundings
- An exothermic reaction is one that transfers energy to the surroundings
- E.g Combustion and Neutralisation
- Uses include hand-warmers and self-heating cans
- An endothermic reaction is one that takes energy from the surroundings
- E.g Thermal Decomposition
- Uses include sports injury packs
- If a reversible reaction is exothermic in one direction, it is endothermic in the other direction
Calculating and Explaining Energy Changes:
- The relative amounts of energy released when substances burn can be measured by simple calorimetry
- e.g by heating water in a glass or metal container
- Q = m c ΔT
- Energy is normally measured in J (Joules)
- For comparison purposes, energy values could…
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