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 only be evaluated by changing the chemical identity of the substance, such as reactivity.

Classification of Matter:

• Matter is classified into Pure Substances and Mixtures.

• Pure Substances are further divided into Elements and Compounds.

• Mixtures are categorized as Homogeneous (uniform composition) and 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