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.

to find the unit price, we must figure out the cost of one item (in this case one dish towel).   to do this, we divide the total price ($7.92) by the number of items bought (for this problem it is 8, because there are eight dish towels in one pack).  

$7.92/8 = $0.99

therefore, the unit price, or the price of one dish towel, is $0.99.

hope this !