Chemistry: Chemical&Physical

Physical Properties

Physical properties are properties that do not change the chemical nature of matter.

-Example: Shape, Color, Smell, Texture, Density, Measurements.

Chemical Properties

Chemical properties are properties that do change the chemical nature of matter.

-Example: Explosive, Flammable, Rusting, Tarnishing, Reactivity with water, Electromotive, Combustion.

Physical Change

A physical change is usually a reversible change in the physical properties of a substance as shape or size.

-Example: Crumpling a piece of paper, Cutting wood, Breaking glass, Inflating a volleyball.

Chemical Change

A chemical change is the result of a reaction which creates one of more substances with different chemical properties.

-Example: Vegetable scraps in the compost bin decompose to form rich soil, A green tomato ripens and turns red, Wood burns to form black charcoal, An egg is cooked to become a white and yellow solid.

Chemical Reactions

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

-Example: Temperature, Color, Release of gas, Moisture

Reactants and Products in a Chemical Reaction

The reactants are the substances that are present before the chemical change takes place, the products are the substances that are formed during the chemical change.

-Example: Baking a cake

Law of Conservation of Mass

The law of conservation of mass is a relation stating that in a chemical reaction, the mass of the product equals the mass of the reactants.