Gas burning in an engine is an example of a

chemical change

phase change

physical change

nuclear change

The answer is the first option. Gas burning in an engine is an example of a chemical change. Chemical change is a change where the substance changes in identity or form new substances after undergoing a process. In this case, the gas reacts with oxygen forming combustion products, commonly carbon dioxide and water.

a.

Explanation:

Neutralization reactions produce a salt and a water.

LiBr is a salt and H2O is water.

Nothing else fits.