Energy from Reactions
- Created by: Uswa
- Created on: 24-03-13 15:55
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- Energy from Reactions
- During a chemical reaction
- Energy is SUPPLIED to BREAK bonds
- Energy is RELEASED when bonds are FORMED
- Exothermic reactions
- Energy RELEASED from forming new bonds is GREATER than energy NEEDED to break existing bonds
- Endothermic Reactions
- Energy NEEDED to break existing bonds is GREATER than the energy RELEASED from forming new bonds
- Catalysts
- Provide a different pathway for a chemical reaction
- That has a lower activation energy
- Provide a different pathway for a chemical reaction
- Hydrogen Fuel Cell
- Hydrogen can be burnt as fuel in combustion engines
- Hydrogen+Oxygen-->Water
- Can also be used in fuel cells that produce electricity
- To power vehicles
- Hydrogen can be burnt as fuel in combustion engines
- Calculations
- 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
- Can be measured by simple calorimetry
- Amount of energy released/absorbed by chemical reactions in solution
- Calculated from the measured temperature change of a solution
- When reagents are mxied in an imsulated container
- This method can be used for reactions of solids with water or for neutralisation reactions
- Calculated from the measured temperature change of a solution
- Relative amounts of energy released when substances burn
- During a chemical reaction
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