Energy changes in reactions
- Created by: Noshinxoxo
- Created on: 05-12-13 16:21
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- Energy changes (in reactions)
- Two types of energy changes in reactions
- EXOTHERMIC (energy given out)
- Examples
- The combustion of fuels
- The neutralisation of an acid by an alkali
- The reaction between iron and sulfur
- The reaction between hydrochloric acid and magnesium
- ?System loses energy
- ?The temperature of the surroundings increases
- Is the energy more or less than the energy given out?
- ENDOTHERMIC (energy taken in)
- Examples
- Photosynthesis (uses energy from sunlight)
- The thermal decomposition of calcium carbonate
- Reactions that take place during cooking
- The reaction between sodium hydrogen carbonate (baking soda) and citric acid
- ?The temperature of the surroundings decreases
- System gains energy
- Examples
- more
- Then the reaction absorbs energy, overall. So its an ENDOTHERMIC reaction
- less
- Then the reaction releases energy, overall. So its an EXOTHERMIC reaction
- ENDOTHERMIC (energy taken in)
- Examples
- ENDOTHERMIC (energy taken in)
- Examples
- Photosynthesis (uses energy from sunlight)
- The thermal decomposition of calcium carbonate
- Reactions that take place during cooking
- The reaction between sodium hydrogen carbonate (baking soda) and citric acid
- ?The temperature of the surroundings decreases
- System gains energy
- Examples
- EXOTHERMIC (energy given out)
- 10J of energy in the reactant 6J of energy in the product
- Why?
- 2J are used for breaking bonds & 2J of energy are used for making new bonds
- Overall energy change = breaking of bonds & making of new bonds
- 2J are used for breaking bonds & 2J of energy are used for making new bonds
- Why?
- Two types of energy changes in reactions
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