Bond Enthalpies (OCR A-Level Chemistry A): Quizzes

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Bond Enthalpies
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What is average bond enthalpy?

Energy to break 1 mol of a bond in gas

What type of process is bond breaking?

Endothermic - energy absorbed

What is the sign of the enthalpy change when bonds are made?

Negative - bond making is exothermic

Which bond has the highest enthalpy?

N≡N\text{N}\equiv\text{N} at 945 kJ mol−1^{-1}

Which formula calculates enthalpy change from bond enthalpies?

ΔrH\Delta_r H = bonds broken - bonds made

Why do bond enthalpies vary for the same bond type?

Chemical environment affects bond strength

When is a reaction exothermic overall?

Bond making releases more than breaking needs

What is required for all species in bond enthalpy calculations?

All species must be gaseous molecules

What sign do bond enthalpy values always have?

Positive - reflects endothermic breaking

What is the bond enthalpy of an O=O\text{O}=\text{O} bond?

498 kJ mol−1^{-1}

Explore OCR A-Level Chemistry A Revision Notes by Topics

Periodicity

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Enthalpy

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Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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Periodicity

Reactivity Trends

Enthalpy

Reaction Rates and Equilibrium

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