The burning of a piece of magnesium ribbon in air is a chemical change. Explain.

Give four reasons why burning of a magnesium ribbon in air is considered a chemical change.

The burning of a candle is a chemical change. Explain.

The burning of paper is a chemical change. Why?

Cutting of paper into pieces is a chemical change.

Explain energy changes in a chemical change.

Burning of sugar is a temporary change.

As magnesium burns in oxygen to produce magnesium oxide, there is no change in mass. Explain.

A burning candle shows both physical and chemical changes. Explain.

Write the observations for the following: Piece of magnesium ribbon is placed over flame.

All energetically effective collisions do not result in a chemical change. Explain.