Question

which change is the best example of a physical change?

Answer 1

There are multiple examples, for instance:

- Cutting a paper
- Ripping an object
- Mixing sand and water

Basically, anything that changes an object but is able to be reverted back to its original form. Since physical change is the opposite of chemical change, you need to focus on the factor that physical change keeps its original form.

A chemical change is when you can't revert the object back to its natural form, for instance, burning a paper or lighting anything on fire. 

Hope this helps!

Answer 2

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.