Question

When you light a piece of magnesium ribbon it burns with a dazzling white light. A white ash forms. What signs are there that a chemical change has taken place?

Answer 1

Yes, it a chemical change
A new substance ash is formed
Light is produced

Answer 2

ANSWER:

Following observations are signs that a chemical reaction has taken place

1. Heat is evolved during this activity.
2. The compound formed can't be changed back into magnesium ribbon.