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All you need to know about Additional Science

All you need to know about Additional Science. Topic 5. 5.1 Energy changes. Exothermic reaction , e.g. respiration Energy ‘exits’ reaction – heats surroundings Thermometer readings rises. Endothermic reaction , e.g. photosynthesis Energy ‘enters’ reaction – cools surroundings

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All you need to know about Additional Science

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  1. All you need to know about Additional Science Topic 5

  2. 5.1 Energy changes Exothermic reaction, e.g. respiration • Energy ‘exits’ reaction – heats surroundings • Thermometer readings rises Endothermic reaction, e.g. photosynthesis • Energy ‘enters’ reaction – cools surroundings • Thermometer readings fall

  3. 5.2 Energy and reversible reactions Hydrated Anhydrous copper sulphate copper sulphate + water

  4. 5.3 Haber process (again!) N2 + 3H2 2NH3

  5. 5.3 Haber process (again!) N2 + 3H2 2NH3

  6. 5.3 Haber process (again!) Temperature: - Forward reaction is exothermic, so low temperature is preferred - But this makes reaction slow - Compromise by using 450OC N2 + 3H2 2NH3 Catalyst: - Iron - Speeds up both sides of reaction Pressure: - The higher the better - High pressure is dangerous! - Compromise by using 200-350 atm

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