O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2023 · Q161 Mark

Octane, C8H18, is a hydrocarbon. When octane is mixed with an excess of oxygen, no change takes place unless energy is supplied. If energy is supplied, in the form of heat or an electric spark, a change takes place quickly. The products of this change include carbon dioxide. Which part of this description shows that the change is a chemical change?

AOctane is a hydrocarbon.

BNo change takes place unless energy is supplied.

CThe change takes place quickly.

DCarbon dioxide is produced.

✓ Correct answer

D: Carbon dioxide is produced.

Oracle Prep sorts past-paper questions by topic, so you can drill Rates of Reaction and see which topics are most likely to come up next.

Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 1, question 16.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content