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

The difference between matter and energy is that energy is produced from matter yet has no mass and is the capacity to do work while matter is the physical "stuff" in the universe. Matter needs energy to move. More » Science Chemistry States of Matter

Extensive properties are those which depend on the amount of matter present, while intensive properties are those that do not change regardless of the amount of matter present. These are both classes of physical properti... More » Science Chemistry States of Matter
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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 » 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 » 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

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 » Science Chemistry