Avariety of observations can indicate whether or not a chemical reaction is happening when chemicals are mixed. which of the following is most likely to indicate a chemical change when a fuel burns? a. no gas bubbles form b. a clear solution is formed c. the mixture changes temperature d. there is a coloured flame

Burning gas in a Bunsen burner is also a chemical change. The methane gas burns with oxygen in the air to form two new substances: carbon dioxide and water vapour. During this chemical reaction heat is also produced. When you try to light a piece of solid wax it melts, but does not burn.

The answer is A. No gas bubbles form.