Chemistry Topic 5 - Energy Changes
- Created by: EleanorRowley
- Created on: 20-03-19 12:47
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- Topic 5 - Energy changes
- Law of Conservation of Energy
- Energy cannot be created or destroyed.
- In all reactions energy is transferred to or from surroundings
- Endothermic reaction
- Energy is transferred from surroundings
- Temperature decreases as thermometer is outside surroundings
- E.g. Thermal decomposition reaction
- Citric acid and sodium hydrgencarbonate
- Cooling sports injury packs
- Breaking bonds
- Products have more energy
- Exothermic reaction
- Energy is transferred to surroundings
- E.g. Combustion or Respiration
- Temperature increases
- Self heating cans, hand warmers
- Making bonds
- Reactants have more energy
- Reactants
- Substances involved in a chemical reaction
- Reaction profile
- Diagram that shows if reactants have more or less energy than products
- Products
- Substances formed in a chemical reacton
- Overall energy change
- Work out difference between energy needed to break all bonds and energy needed to form all bonds
- During a chemical reaction:
- Energy must be given to break bonds
- Energy is released from products formed
- Law of Conservation of Energy
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