Answer
Part A - Physical change
a) a change of state
d) a change that can be measured without reference to other substances
Part B - Chemical change.
b) a change in reactivity.
c) results in a substance different from the original.
Step-by-step explanation
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Examples of physical change include changes in the size or shape of matter. Changes of state, for example, from solid to liquid or from liquid to gas, are also physical changes. Some of the processes that cause physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Chemical changes cause a substance to change into an entirely substance with a new chemical formula or chemical changes occur when a substance combines with another to form a new substance. Examples are burning of any substance, rusting of iron.
Part A - Physical change
a) a change of state
d) a change that can be measured without reference to other substances
Part B - Chemical change.
b) a change in reactivity.
c) results in a substance different from the original.