Magnesium is a shiny, flexible Material that can be burned in the presence of air. When it is burned, it produces a white powder that is is no longer a shiny and flexible material. This white powder also has more mass than the original magnesium.

Choose the one that best gives the best evidence that a chemical reaction occurred, explain.

A - The molecules were separated into individual atoms.
B - The mass of the magnesium changed.
C - Smoke that was trapped between the magnesium atoms was given off.
D - A new substance was formed.