Physical and Chemical Properties

Physical properties are properties that do not change the chemical nature of matter. They are often referred to as observables. Physical properties are categorized as intensive and extensive properties. Intensive properties do not depend on the size or extent of the system, nor the amount of matter in the object. Extensive properties shows an additive relationship.

Examples of physical properties are:



Freezing Points

Boiling Points

Infra-Red Spectrum

Attraction or Repulsion Magnets



And Density

Physical changes are changes that affect the form of a chemical substance but not its chemical composition. Physical changes are used to separate mixtures into their component compounds. They usually can't be used to separate compounds into chemical elements or simpler compounds.

Physical change involves a change in physical properties such as:


Transition to gas

Change in Strength

Change in Durability

Changes to Crystal Forms

Texture Changes




And Density

Chemical properties are properties that do not change the chemical nature of matter. They become evident during a chemical reaction. Chemical properties can't be determined by touching or viewing the substance, the internal structure of a substance has to be effected for them to be investigated.

Examples of chemical properties are:

Heat of Combustion

Reactivity With Water


And Electromotive Force

Chemical change occurs when a substance is combined with another to form a new substance. This process is called a chemical reaction and they are not reversible except by further chemical reactions. When a chemical reaction occurs, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.

Evidence of a chemical changes include:

Change of Smell

Change of Color

Change in Temperature or energy (production or loss of heat)

Light and or Heat being given off

Formation of Gases


And Decomposition

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