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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 »

www.reference.com Science Chemistry Atoms & Molecules

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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Because the process during digestion causes food to become a new substance, digestion is a chemical change. A physical change occurs when a subject changes its shape, size or state. More »

www.reference.com Science Chemistry
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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

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 »

www.reference.com 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 »

www.reference.com Science Chemistry

Because the process during digestion causes food to become a new substance, digestion is a chemical change. A physical change occurs when a subject changes its shape, size or state. More »

www.reference.com Science Chemistry