A combstible substance is made up of hydrocarbons (compounds containing carbon and hydrogen). When such a substance is burnt in air, carbon dioxide and water are formed, with the evolution of heat and light.
Give the chemical equation when combustible substance is heated in sufficient supply in air.

Explanation

To answer the question regarding the combustion of a hydrocarbon in sufficient supply of air, we can follow these steps:

### Step 1: Identify the Hydrocarbon
A hydrocarbon is a compound made up of hydrogen (H) and carbon (C). For example, let's consider a simple hydrocarbon like methane (CH₄).

### Step 2: Write the General Equation for Combustion
When hydrocarbons combust in the presence of sufficient oxygen (from the air), they produce carbon dioxide (CO₂) and water (H₂O). The general equation for the combustion of a hydrocarbon can be written as:
\[ \text{Hydrocarbon} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} \]
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