Module 3 Lesson 2 - Enthalpy Changes in Chemistry.

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Presentation transcript:

Module 3 Lesson 2 - Enthalpy Changes in Chemistry

Objectives Must Recall and use the term STANDARD CONDITIONS Should Define the terms standard enthalpy change of REACTION, FORMATION AND COMBUSTION. Could Calculate and write chemical equations for the standard enthalpy changes

Starter - AfL When a chemical reaction takes place heat may be given out or taken in. AfL - Sketch an energy profile for an exothermic reaction and an endothermic reaction showing activation energy AND the overall energy change.

Enthalpy of reaction

Main: What are standard conditions?

Definitions – part 1

AfL Quiz – Part 1 ΔH r

Definitions – part 2

AfL Quiz part 2- ΔH c Write equations for the change that occurs during the enthalpy change of combustion for each of the following compounds i)CH 4 (g) ii)C 3 H 8 (g) iii)CS 2 (l) iv)CH 3 OH(l) v)C 2 H 5 OH(l)

Definitions – part 3

AfL Quiz part 3- ΔH f Write equations for the change that occurs during the enthalpy change of formation for each of the following compounds. i)C 2 H 4 (g) ii)C 2 H 6 (g) iii)C 2 H 5 OH(l) iv)CaO(s) v)Al 2 O 3 (s)

Quick tips

Plenary - Exam question

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