A compound contains more than one substance.
Compounds are formed when elements react or combine chemically. Eg. Magnesium+Chlorine --->Magnesium chloride.
If a compound has only TWO elements the name endes with IDE. Eg. NaCl- Sodium+Chlorine--->sodium Chloride.
If the compound contains MORE THAN TWO elements the name ends with ATE. Eg. FeS-Iron+Sulphur--->Iron Sulphide.
Elements are the simplest part of matter that cannot be divided any further by chemical means. Eg. Gold, Oxygen, Mercury&hydrogen.
An element is made up of the same type of atoms and cannot be changed into another element.
Mixtures/atom/molecule/composition of air&why is a
Mixtures are substances that contain more than one substance. Most materials are mixtures. Mixtures cane be separated into pure substances.
Atom-Simplest type of particle that can exist on its own and take part in a chemical reaction.
Molecule-Combination of two or more atoms of an element or different elements.
Air is a mixture because it contains more than one substance. It contains mainly oxygen&nitrogen and a little bit of carbon dioxide&other gases.