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
similar articles

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

Carbon has numerous physical properties, and some of these properties are quite different depending on the structural form of the molecules. Carbon's mineral hardness is measured at 0.5 for graphite and 10.0 for diamonds... More » Science Chemistry Atoms & Molecules

The chemical composition of table salt is one atom of sodium (Na) to one atom of chlorine (Cl), known as sodium chloride (NaCl). Table salt also often has iodine added in for health reasons, but this does not change the ... More » Science Chemistry Atoms & Molecules