Physical Properties: Properties that can be measured without changing the chemical composition of a substance, such as mass, volume, and density.

Chemical Properties: Properties that can be evaluated by changing the chemical composition of matter, indicating how a substance reacts with other substances.

Classification of Matter:

• Pure Substances: Consist of only one type of particle; can be elements or compounds.

• Mixtures: Contain two or more substances physically combined; can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).

Law of Chemical Combination:

• Law of Conservation of Mass: In any chemical change, the total mass of reactants is always equal to the total mass of products formed.

• Mass:Reactants=Products