Which change is the best example of a physical change?

This is an incomplete question, here is a complete question.

Which change is the best example of a physical change?

1) a cookie baking

2) a paper burning

3) ice cream melting

4) a nail rusting

Answer : the correct option is, (3) ice cream melting

Step-by-step explanation :

Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance. It is an irreversible reaction.

The indication of chemical changes are :

Formation of gas bubbles.

Formation of precipitate.

Change in color.

Change in temperature.

Change in volume.

Change in smell or taste.

Evolution of heat, light and sound.

Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming. It is a reversible reaction.

The indication of chemical changes are :

Change in shape.

Change in form.

Change in size.

Change in phase.

1) a cookie baking

2) a paper burning

4) a nail rusting

Option 1, 2 and 4 are a chemical change because changes takes place in the chemical composition and form new compound.

3) ice cream melting  : It is a physical change because only changes takes place in the phase from solid phase to liquid phase.

Hence, the best example of a physical change is, ice cream melting.

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