TOPIC 8 - Energetics I
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What is the enthalpy change of a reaction?
The change in heat energy in a reaction at constant pressure measured in kJ/mol.
What does this symbol mean?
Enthalpy change with standard conditions (298K, 100kPa) and all elements in standard states.
What are endothermic reactions?
How does the energy diagram for an endothermic reaction look like?
What are exothermic reactions?
How does the energy diagram for an exothermic reaction look like?
What does this symbol mean?
What does this symbol mean?
What does this symbol mean?
What does this symbol mean?
Is breaking bonds endothermic or exothermic?
Is making bonds endothermic or exothermic?
What is the equation for enthalpy change, in terms of energy from breaking/making bonds?
What is bond enthalpy?
What is the equation for measuring the heat energy change in a calorimeter?
How can the enthalpy of a reaction be calculated using a calorimeter?
• Calculate the amount of energy. • Divide it by the number of moles.
Why is a calorimetry experiment with solutions often carried out in a polysterene cup?
To prevent heat loss.
What is Hess’ law?
When given enthalpy of formation, which Hess cycle would you draw?
When give enthalpy of combustion, which Hess cycle would you draw?
