Chemistry · Oct / Nov 2023 · Paper 11 · Question 16

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?

1. AOctane is a hydrocarbon.
2. BNo change takes place unless energy is supplied.
3. CThe change takes place quickly.
4. DCarbon dioxide is produced.

As printed in the paper