While physical change is the rearranging of molecules in a substance, a chemical change affects the intrinsic properties of a substance, altering its chemical composition. More » Science Chemistry Atoms & Molecules

Burning, or rather combustion, leaves you with a different material than the one with which you started. A chemical change occurs if a new substance is created and most of the time cannot be reversed. More » Science Chemistry States of Matter

Physical changes do not produce new substances, but chemical changes do produce new substances. A physical change is concerned with states of matter. Melting, vaporization, freezing, sublimation and condensation are phys... More » Science Chemistry
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The difference between a chemical change and a physical change lies in how the change affects the composition a substance. A chemical change occurs on the molecular level and produces a new substance. However, a physical... More » Science Chemistry Atoms & Molecules

A material that has the same composition and properties throughout is a pure chemical substance. A chemical substance cannot be separated into components by a physical method. Chemical substances can be plasma, gases, li... More » Science Chemistry States of Matter

Density is a physical property because its measurement or observation does not alter the chemical composition of a substance. Other physical properties include color, texture, melting point and volume. When a chemical pr... More » Science Chemistry

No, the rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide. Rusti... More » Science Chemistry