Practice Using Bond Enthalpies To Estimate Reaction Enthalpy (3.1.2)

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6 sample questions

Question 1.
What does bond enthalpy measure?
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Think of it as a way to gauge how strong a bond is.
Question 2.
What is the expected relationship between broken and formed bonds?
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Consider how these processes contribute to overall ΔH.
3Question 3.
What is bond enthalpy?
- The energy to break a bond
- The energy to form a bond
- The energy in a solution
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Remember, it relates to breaking bonds, not forming them.
4Question 4.
Is ΔH positive when bonds are formed?
- True
- False
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Think about whether energy is given off or absorbed during bond formation.
Question 5.
Use average bond enthalpy values to estimate ΔH for the reaction: C₂H₄(g) + H₂(g) → C₂H₆(g). What factors might affect your estimate?
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Don’t forget to write out the energies for each bond type!
Question 6.
Given the reaction: 3 O₂(g) + CH₄(g) → 2 CO₂(g) + 2 H₂O(g), list the bonds broken and formed. Estimate ΔH.
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You might need to look up bond energies before calculating.

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