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OCR GCSE Combined Science

Topic questions Energy changes Bond energy calculations

Bond energy calculations

5 questions · 29 marks · about 35 minutes

Bond energy calculations questions

TopicBond energy calculations

OCR J250 Bond energy calculations 5 questions

Chemistry Paper 9 June 2025 Higher tier, Question 14 11 marks

The properties of materials depend on their structure and bonding.

(a)

The table shows some information about four materials.

Figure for question 14

Draw four lines to connect each material with its correct structure.

Figure for question 14
[4]
Reveal mark scheme Mark scheme for question 14(a)
(b)

Ethene, C2H4, has this structure.

Figure for question 14
(b)(i)

Complete the dot and cross diagram for a molecule of ethene.

Only show the outer shell electrons.

Figure for question 14
[2]
Reveal mark scheme Mark scheme for question 14(b)(i)
(b)(ii)

Explain why ethene has a low boiling point.

Use ideas about structure and bonding.

[2]
Reveal mark scheme Mark scheme for question 14(b)(ii)
(c)

The equation shows how ethene can be produced.

Figure for question 14

The table shows some bond energies.

BondBond energy (kJ / mol)
C–C347
C–H413
C=C612
H–H436
(c)(i)

Calculate the total energy transferred to break all the bonds in the reactant.

Energy transferred to break all the bonds =........ kJ / mol

[1]
Reveal mark scheme Mark scheme for question 14(c)(i)
(c)(ii)

Calculate the total energy transferred to make all the bonds in the products.

Energy transferred when all the bonds are made =........ kJ / mol

[1]
Reveal mark scheme Mark scheme for question 14(c)(ii)
(c)(iii)

Use your answers to parts (i) and (ii) to calculate the energy change for the reaction.

Energy change =........ kJ / mol

[1]
Reveal mark scheme Mark scheme for question 14(c)(iii)

Chemistry Paper 9 June 2023 Higher tier, Question 16 6 marks

Figure for question 16
(a)(i)

Calculate the total energy transferred to break all the bonds in the reactants.

Energy transferred to break all the bonds =........ kJ / mol

[1]
Reveal mark scheme Mark scheme for question 16(a)(i)
(a)(ii)

Calculate the total energy transferred when all the bonds in the products are made.

Energy transferred when all the bonds are made =........ kJ / mol

[1]
Reveal mark scheme Mark scheme for question 16(a)(ii)
(a)(iii)

Use your answers to parts (i) and (ii) to calculate the energy change for the reaction.

Energy change =........ kJ / mol

[1]
Reveal mark scheme Mark scheme for question 16(a)(iii)
(b)
Figure for question 16
[3]
Reveal mark scheme Mark scheme for question 16(b)

Chemistry Paper 9 November 2021 Higher tier, Question 15 10 marks

Carbon dioxide, CO2, is a covalently bonded molecule.

(a)

Explain what is meant by a covalent bond.

[2]
Reveal mark scheme Mark scheme for question 15(a)
(b)

Look at the diagram. It shows the structure of carbon dioxide.

Question 15, shown as an image

Complete the dot and cross diagram for carbon dioxide.

Figure for question 15
[2]
Reveal mark scheme Mark scheme for question 15(b)
(c)

The equation shows the formation of 1 mole of carbon dioxide from carbon monoxide and oxygen.

Question 15, shown as an image

The table shows the bond energies of some bonds.

BondBond energy (kJ / mol)
C≡O1070
O=O496
C=O743

Calculate the energy change for the formation of 1 mole of carbon dioxide.

Energy change =........ kJ / mol

[3]
Reveal mark scheme Mark scheme for question 15(c)
(d)(i)

Explain the term activation energy.

[2]
Reveal mark scheme Mark scheme for question 15(d)(i)
(d)(ii)

Look at your calculation in (c).

Suggest a value for the activation energy for the formation of 1 mole of carbon dioxide in this reaction.

[1]
Reveal mark scheme Mark scheme for question 15(d)(ii)

Chemistry Paper 9 June 2019 Higher tier, Question 8 1 mark

The table shows bond energies.

BondBond energy (kJ / mol)
H–H436
Cl–Cl243
H–Cl432

Hydrogen reacts with chlorine to form hydrogen chloride.

Question 8, shown as an image

What is the energy change, in kJ / mol?

A –247

B –185

C +185

D +247

Question 8, shown as an image
[1]
Reveal mark scheme Mark scheme for question 8

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