Practice Bond Enthalpies (5.5) - Unit 5: Energetics and Thermochemistry

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8 questions

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6 sample questions

Question 1.
What is bond enthalpy?
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Think of it as the energy needed to 'unzip' a bond.
Question 2.
Determine if the combustion of propane is exothermic or endothermic.
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Does the reaction give off heat or absorb it?
3Question 3.
What is bond enthalpy?
- Energy needed to break a bond
- Energy needed to form a bond
- Both A and B
- None of the above
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Think about what you have to do to separate two atoms in a bond.
4Question 4.
Is ΔH positive for exothermic reactions?
- True
- False
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Remember the relationship between heat flow and reaction types.
Question 5.
Using bond enthalpies, estimate the ΔH for the reaction N₂ + 3 H₂ → 2 NH₃.
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List all bonds in the reactants and products and use the enthalpy equation.
Question 6.
Discuss how varying temperature might affect bond enthalpy measurements.
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Consider how heat affects molecular interactions.

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