Question

a physical change ____ change the composition or identity of the substance.
a will
b will not
an example of a physical change is
a crushing a rock
b a shirt fading in the sun
the most common occurrences of physical changes are
a changes in the phase of matter.
b changes that occur in nature.

Explanation:

1. A physical change only affects the physical properties like shape, size, state of matter etc. and not the chemical composition or identity of the substance.
2. Crushing a rock is a physical change as it only changes the physical form of the rock. A shirt fading in the sun is a chemical change due to chemical reactions with sunlight.
3. The most common physical changes are changes in the phase of matter such as melting, freezing, evaporation etc.

Answer:

1. B. will not
2. A. crushing a rock
3. A. changes in the phase of matter