Chemistry flashcards 0.0 / 5 ? ChemistryEnthalpyA2/A-levelOCR Created by: The_AvatarianCreated on: 23-08-20 14:08 What is an Exothermic reaction? A reaction that gives out energy to the surrounding area 1 of 6 What is an Endothermic reaction? A reaction that takes in energy from the surrounding area. 2 of 6 Define the term ’standard enthalpy change’ of a reaction? The heat energy change measured under standard conditions. 3 of 6 What is the equation used to calculate heat energy change from experimental data? q = mcΔT 4 of 6 For an endothermic reaction, is the ΔH value positive or negative and why? ΔH = positive because the products are higher in energy than the reactants and the heat is absorbed from surrounding areas 5 of 6 State one way you can find the Mean Rate of reaction? quantity of reactant used divided by time taken or quantity of product formed divided by time taken 6 of 6
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