AQA GCSE Chemistry · 8462
Specification 4.5.1.3 · Paper 1
Revise: Bond Energy CalculationsA supplied bond energy is the energy required to break one mole of a particular type of bond.
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GCSE Chemistry · key term
The energy required to break one mole of a specified type of chemical bond; it is usually given in kJ/mol.
Used by AQA, Edexcel and OCR
Specification 4.5.1.3 · Paper 1
Revise: Bond Energy CalculationsA supplied bond energy is the energy required to break one mole of a particular type of bond.
Specification 7.14 · Paper 2
The energy required to break one mole of a specified type of bond, given in .
Revise: Calculating Energy ChangeMultiply each number of bonds by its given bond energy and add these values.
The energy required to break one mole of a specified covalent bond, usually stated in kilojoules per mole.
Specification CM3.2ii, C3.2d · Paper 1 (Foundation), Paper 3 (Higher)
The energy needed to break one mole of a specified type of chemical bond, usually given in kJ/mol.
Revise: Energy CalculationsFor Higher Tier, bond energies let you calculate that change. A bond-energy value tells you how much energy is needed to break one mole of a particular bond. Start with a balanced equation, count each type of bond in the reactants and products, then multiply each count by its bond energy.
The energy needed to break one mole of a particular type of covalent bond in gaseous substances.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The energy needed to break one mole of a particular covalent bond in gaseous molecules into gaseous atoms, measured in kJ mol⁻¹.
Revise: Calculating energy changesA bond energy tells us how much energy is needed to break one mole of a particular covalent bond in gaseous molecules, producing gaseous atoms. It is usually given in kJ mol⁻¹. Forming the same bond releases the corresponding amount of energy.
The energy required to break one mole of a particular covalent bond in gaseous molecules; bond energy values are usually given in kJ/mol.
Treat supplied bond energies as positive magnitudes. Add the energy released by bond formation, then subtract that total in the overall calculation.
Give the calculated molar energy change in kJ/mol when the supplied bond energies are in kJ/mol, and interpret its sign: negative is exothermic; positive is endothermic.
Multiply each bond energy by the number of that bond before adding the totals.
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