Chemistry 2.4 Energetics and enthalpy 0.0 / 5 ? ChemistryEnthalpyASWJEC Created by: DanCreated on: 28-12-13 13:02 What is enthalpy? State the symbol. The heat content of a system. H 1 of 9 What is enthalpy change? The heat added to a system at constant pressure 2 of 9 What is the chemical system? Reactants and products 3 of 9 What happens to atoms during chemical reactions? Chemical bonds are broken and reformed changing the state of the atom 4 of 9 What changes as a result of this? Chemical energy 5 of 9 State the principle of conservation of energy. Energy cannot be created nor destroyed, only changed from one form to another 6 of 9 How do you work out Enthalpy change? Enthalpy of Products - Enthalpy of Reactants 7 of 9 State the 3 main enthalpy change reactions. Combustion, Formation and Reaction 8 of 9 State Hess' law the total enthalpy change for a reaction is independent of the route taken from the reactants to the products 9 of 9
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