Bond Energy (HSC SSCE Chemistry): Quizzes

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Bond Energy
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What is bond energy?

Energy needed to break a chemical bond

What symbol is commonly used to represent bond energy?

BB

Why is the C-H\text{C-H} bond energy one quarter of the enthalpy change to break methane?

Methane contains four C-H\text{C-H} bonds

What is the heat of atomisation of an element?

Enthalpy change to form gaseous atoms

What is the heat of atomisation of nitrogen?

473 kJ mol−1^{-1}

How does bond energy relate to compound stability?

Greater bond energy = more stable

What are the bond energies of O2\text{O}_2 and O3\text{O}_3 respectively?

498 and 302 kJ mol−1^{-1}

What is the formula for estimating ΔH∘\Delta H^{\circ} from bond energies?

ΔH∘\Delta H^{\circ} = bonds broken - formed

Is breaking bonds endothermic or exothermic?

Endothermic (requires energy)

Why are bond energy calculations not particularly accurate?

Bond energies vary between molecules

Explore HSC SSCE Chemistry Revision Notes by Topics

Energy Changes in Chemical Reactions

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Energy Changes in Chemical Reactions

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Energy Changes in Chemical Reactions

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Explore HSC SSCE Chemistry Exam Questions by Topics

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