Why is burning fuel a chemical change?

Answer 1

Because Hydrogen and carbon react with O2 This change produces heat, CO2 and H2O (Water Vapor) Burning is an oxidation (reaction with oxygen).

The six basic indicators of chemical changes are: TOPIC-B, temperature change, odor change, precipitate, irreversibility, color change, and bubbles of a new gas (or new gas minus a liquid for bubbles to form in). Burning is usually associated with combustion, and would likely be a chemical reaction.

Answer 2

When you burn a fuel you convert the fuel (usually a hydrocarbon) and oxygen into water and carbon dioxide.

So the materials you start with are converted into completely different substances.

Answer 3

Any combustion (burning a fire) is a chemical change because new substances are made from the burning materials which are completely different to the unburned material. Also these new materials cannot be made back into the starting materials by a simple process like cooling.

Answer 4

Fire is Combustion, in which your reactant is reacted with oxygen and heat to form carbon dioxide and water, so you turn your reactant into a product this is a chemical change.

Answer 5

Because burning a candle produces new products, carbon dioxide, water vapour, soot.

You can't make the ashes go back to being a candle.

Answer 6

When something is burned, a chemical reaction took place combining the thing that was burned with oxygen.

Answer 7

Because after we burn fuel, a new substance is formed "ash". And usually, chemical change is irreversible.