State whether the following are physical or chemical change. Explain by giving reason.

Burning of paper

State whether the following is a physical or chemical change. Explain by giving a reason.

Drying of wet clothes.

Show that there is no change in a physical change by the example of dissolution of sugar in water.

Explain why heating of ammonium chloride is both a physical and a chemical change. Give another example of a similar change.

Explain how each of these help in bringing about a chemical change.

Pressure.

Explain how each of these helps in bringing about a chemical change.

Electricity.