GCSE / O Levels Chemistry

Octane, C   8 H   18 , 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?  A   Octane is a hydrocarbon.  B   No change takes place unless energy is supplied.  C   The change takes place quickly.  D   Carbon dioxide is produced.

Fuels | 2023 - O/N - 5070/11 | Q16