Boiling water is a physical change, as it rearranges molecules but does not affect the internal structures. Boiling water forces the water molecules away from each other as the liquid changes to vapor. In a chemical chan... More »

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 »

When someone boils an egg, it does undergo a chemical change with the molecules of fluid proteins crosslinking and uncoiling to create a network. A chemical change occurs when new chemical substances form. On the molecul... More »

Baking a cake is a chemical change, not a physical change. A physical change does not produce a new substance, as it only involves a change in state, like butter melting or water freezing. A finished cake, on the other h... More »

Sugar dissolving in water is a physical change and not a chemical one. Chemical changes only occur when new substances form. Dissolving sugar in water does not cause a chemical reaction to take place. More »

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 »

Flame photometers work by separating a chemical sample into its constituent atoms and molecules and then analyzing the colors emitted by the chemicals as they absorb and then release energy. Flame photometers are most co... More »