Energetics, A Level Chemistry, AQA Practice Questions and Answers
What is enthalpy change? Heat energy transferred in a reaction at constant pressure What are standard conditions for enthalpy change? 100kPa and stated temperature (normally 25 degrees celcius) What values of deltaH do exothermic reactions have? Negative (less than 0) What values of deltaH do endothermic reactions have? Positive (more than 0) What do exothermic reactions do with energy? Give out energy What do endothermic reactions do with energy? Absorb energy Are oxidation reactions endo or exothermic? Exothermic Is combustion endo or exothermic? Exothermic Are thermal decomposition reactions endo or exothermic? Endothermic Is photosynthesis endo or exothermic? Endothermic What happens to reactant bonds? They are broken What happens to product bonds? They are formed Which bonds are broken: reactant or product bonds? Reactant Which bonds are formed: reactant or product bonds? Product Is energy taken in or released when you break bonds? Taken in
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