When sugar is dissolved in water to form saturated sugar solution it is a physical change in which solubility of sugar increases with increasing temperature. Hence, more sugar is dissolved in hot solution which is separated out in crystals form on cooling.

Growth of a tree is both a physical change as well as a chemical change. This is because growth of a tree involves changes in overall shape and size of the tree (tree on growing becomes bigger in size and its branches spread out). So, it is a chemical change.

Turning Sap to Syrup Boiling the maple sap not only evaporates out most of the water, but causes chemical changes that give the syrup its color and flavor. Boiling the syrup is a tightly controlled process, which ensures appropriate sugar content.

Physical changes that involve a change of state are all reversible. Other changes of state include vaporization (liquid to gas), freezing (liquid to solid), and condensation (gas to liquid). Dissolving is also a reversible physical change.

There is no effect on the chemical identity of the substance. For example, water remains water, no matter if it solid, liquid or gas. By the way, all phase changes include sublimation (solid to gas) and deposition (gas to solid).

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Cooking of food, boiling of eggs are examples of both physical and chemical changes. In both cases, the physical appearance of the substances change and new substances are formed.

What is a chemical change? (tearing, chopping, shredding, boiling water are all physical changes; cooking pasta is a chemical change).

The science behind roasting marshmallows When marshmallows are roasted, a chemical change happens. When you toast marshmallows, the heat causes a chemical reaction producing water molecules, which then evaporate, leaving carbon behind (the blackened part of the roasted marshmallow).

Hair color is a matter of chemistry. The first safe commercial hair coloring product was created in 1909 by French chemist Eugene Schuller, using the chemical paraphenylenediamine. It’s the result of a series of chemical reactions between the molecules in hair and pigments, as well as peroxide and ammonia.

The rotting of fruit is a chemical reaction. Because an enzymatic reaction causes molecules to change when rotting, rotting is a chemical reaction.