Magnesium is a light silver metal. when it is burned in oxygen, it oxidizes in a bright white light. magnesium oxide is a white powder. how can we be sure that burning magnesium in oxygen is a chemical reaction? a) a gas is produced. b) energy is absorbed. c) there is an explosion. d) there is color change .

D) There is color change .

Explanation:

Magnesium in its metallic state is a very reactive compound because it can undergo a chemical reaction called a Combustion reaction.

A combustion reaction is a chemical reaction where a compound reacts with Oxygen in the atmosphere in the presence of heat to release water and to form an Oxide compound.

Combustion reaction also known as burning is a exothermic chemical reaction which means heat energy is always released.

When Magnesium in its metallic state reacts with oxygen in a combustion reaction, a colour change is observed. A white powder called Magnesium Oxide is formed and heat is released.

answer: the answer is a