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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 »

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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 »

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Cooking can be both a physical and chemical change. For example, mashing up potatoes is a physical change, but baking a cake is a chemical change. More »

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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 »

www.reference.com Science Chemistry Atoms & Molecules

The chemical composition of sand is primarily SiO2, or silica. Silica, which is also named as quartz, is a type of mineral that makes up most of the sand types like beach sand. More »

www.reference.com 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 »

www.reference.com Science Chemistry Atoms & Molecules

The chemical composition of table salt is NaCl. Table salt is a combination of sodium and chlorine, which form ionic bonds. More »

www.reference.com Science Chemistry Atoms & Molecules