Question

when a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. why is the burning of magnesium considered a chemical change? because the metal reaches a high temperature because the metal begins to melt because a new substance is formed because the metal is malleable

Explanation:

A chemical change is characterized by the formation of a new substance. When magnesium burns, it reacts with oxygen to form magnesium oxide (the whitish substance), indicating a chemical reaction has occurred.

Answer:

because a new substance is formed