Practice Enthalpy (h) (1.1.2) - Unit 5: Energetics and Thermochemistry

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6 sample questions

Question 1.
What is enthalpy?
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Consider its relation to internal energy and pressure.
Question 2.
Define an exothermic reaction.
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Think about heat flow in the context of surroundings.
3Question 3.
What does a negative ΔH indicate about a chemical reaction?
- It absorbs heat
- It releases heat
- It has no effect
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Think about the flow of heat in relation to the surroundings.
4Question 4.
True or False: All endothermic reactions have a positive ΔH.
- True
- False
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Consider how heat interacts with the system.
Question 5.
If the standard enthalpy of combustion of a compound is -600 kJ/mol, how much energy would be released when 2 moles of this compound are burned?
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Multiply the enthalpy change by the number of moles.
Question 6.
Using Hess's Law, if the enthalpy change for a reaction A → B is -50 kJ and for B → C is -30 kJ, what is the total enthalpy change for A → C?
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Sum the individual enthalpy changes together.

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