Practice Definition: Bond Enthalpy (d) (3.1.1) - Unit 5: Energetics and Thermochemistry

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6 sample questions

Question 1.
What is bond enthalpy?
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Think about how it relates to breaking a bond.
Question 2.
Why are bond enthalpy values usually positive?
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Consider the energy flow when bonds are broken.
3Question 3.
What does bond enthalpy measure?
- Energy to break bonds
- Energy to form bonds
- Energy in solution
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Think about the energy input required to break a bond.
4Question 4.
True or False: Bond enthalpy values can vary depending on the molecular environment.
- True
- False
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Consider different molecules with the same type of bond.
Question 5.
Estimate the ΔH for the reaction CH₄ + 2 O₂ → CO₂ + 2 H₂O using bond enthalpies.
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List each bond and the number of those bonds carefully!
Question 6.
Discuss why average bond enthalpies are not sufficient for every reaction assessment.
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Consider interactions outside of the isolated gas phase.

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