Practice Bond Enthalpies And Reaction Energetics (3) - Unit 5: Energetics and Thermochemistry

Practice: Bond Enthalpies and Reaction Energetics

Lesson 3Unit 5: Energetics and Thermochemistry

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9 questions

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6 sample questions

Question 1.
What is bond enthalpy?
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Think about energy changes during chemical reactions.
Question 2.
What is the formula to estimate reaction enthalpy using bond enthalpies?
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Remember to consider both bonds broken and formed.
3Question 3.
What is the definition of bond enthalpy?
- The energy required to form a bond
- The energy required to break a bond
- The total energy of a system
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Consider energy changes associated with bonds.
4Question 4.
True or False: Average bond enthalpies are used for precise thermodynamic calculations.
- True
- False
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Think about what influences bond strength.
Question 5.
Calculate and compare the ΔH estimates for the combustion of ethane versus methane, using provided average bond enthalpies for each.
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Focus on counting all bonds for both reactions.
Question 6.
Discuss how the enthalpy of formation changes for acetylene when transitioning from gas phase to liquid phase. What implications does this have for your calculations?
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Always think of how states of matter affect energy.

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