Why is rotting of eggs considered a chemical change?

Give reasons why the following are considered as chemical changes. An iron nail kept open in the atmosphere rusts.

Give reasons why the following are considered as chemical changes. Sulphur when burnt in air evolves a gaseous acidic product.

Give reasons why the following are considered as chemical changes. A bright light is seen evolved when a strip of magnesium is heated.

Give reasons why the following are considered as chemical changes. A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.

Give reasons why the following are considered as chemical changes. Copper carbonate on heat gives copper oxide and carbon dioxide.

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

Why is sublimation considered a physical change and not a chemical change ?

Ripening of fruits is a chemical change

Cutting of paper into pieces is a chemical change.

Rusting of iron is a chemical change.