Question

A substance combines with oxygen and releases energy in the form of heat and light. Which of the following best describes this type of chemical reaction?

Combustion
Synthesis
Decomposition
Single Replacement

Answer 1

Answer: Combustion

Explanation: Combustion is a reaction in which a substance (a fuel) reacts with oxygen to produce heat energy. Another name for combustion is burning. Combustion can be complete or incomplete: complete combustion takes place in the presence of unlimited supply of oxygen in which the substance is completely oxidized leaving water and carbon dioxide as by-products. Incomplete combustion occurs in the presence of limited quantity of oxygen in which the substance is not completely oxidized. The byproducts are carbon monoxide and soot.

Answer 2

Answer: Combustion is the correct answer.

Explanation:

When a substance combines with oxygen and energy is emitted in the form of heat and light, this process is called combustion.

There are two types of combustion.

1) Complete Combustion : It is a type of combustion in which fuel is quickly react with high amount of oxygen forming carbondioxide, water, heat and light.

2) Incomplete combustion : It is a type of combustion in which fuel is react with low amount of oxygen forming carbonmonoxide, carbon and water.