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 »

Water freezing into ice is a physical change because the hydrogen and oxygen molecules that make up the water stay the same, despite the change in state from liquid to solid. A physical change is simply a change in the m... More »

In chemistry, a physical change occurs when matter is altered without modifying its basic molecular composition. Some examples of physical changes include boiling or freezing of water, chopping up wood, melting of gold o... 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 »