Chemistry is the science concerned with the properties, composition, and behaviour of matter.
Matter is anything that has mass and occupies space.
Mass is the amount of matter contained in a thing. Usually the mass of common things is measured in grams or kilograms.
Properties are the qualities of a thing, especially those qualities common to a group of things. The relationship between matter and its properties is a very important aspect of chemistry.
A physical property of a substance is a property that can be found without creating a new substance.
For example: color, density, melting point
A chemical property is the ability of a substance to undergo chemical change/ reaction and change into a different substance.
For example: flammability, reactivity with acid
The properties of matter are also classified as being either physical properties or chemical properties. Recall, Physical properties describe physical changes, which are changes of state or form. Physical properties also describe the physical characteristics of a material.
Chemical properties describe chemical reactions. Chemical changes are those in which a new substance(s) or species is formed (Figure 2.1.2). Chemical properties also describe the tendency of a chemical to react with other substances.
Chemical properties describe relationships or interactions between different forms of matter.
They include a chemical’s:
- Flammability
- Reactivity
- Toxicity
- Stability
Most physical properties describe relationships or interactions between matter and energy.
- Hardness
- Malleability
- Ductility
- Lustre
- Viscosity
- Diffusion
For example,
A material can be classified as opaque, translucent, or transparent by how it interacts with light. Other physical properties you may have learned about include color, density, odor, and surface tension.
Parent Tip: Review the logic above to help your child master the concept of chemical or physical change worksheet.
