Which best describes the difference between a physical change and a chemical change?

a. a chemical change does not result in a new substance being formed, whereas a physical change does.

b. a physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

c. a physical change produces a new element, and a chemical change results in a bond breaking between atoms.

d. a chemical change results in a new element being formed, and a physical change results in a new compound being formed.

A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

Physical properties:

Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.

Example.

Water when freezes into ice, it is physical change, just state is change.

Chemical properties:

The chemical properties depend upon composition.

Example:

Formation of precipitates is an example of chemical change.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)