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Compounds and mixtures
Transcript of Compounds and mixtures
The Periodic table, Elements and how they exist
Elements names that we need to learn about and their symbols
A molecule is a group of atoms joined together. It is the smallest particle of an element or compound that can exist independently
A compound is a substance that is made up of two or more different elements combined together chemically
The property of compounds usually differ completely from those of the elements from which they were made e.g NaCl, CO2, MgO, Fes
In compounds the elements are present in fixed ratio by number e.g. H2O (2:1), CO2 (1:2)
A mixture consists of two or more different substances mingled with each other but not chemically combined
But salt in water is a mixture e.g. sea water
separation techniques for mixtures
All compounds are molecules
but not all molecules are compounds as compounds require at least 2 different elements in them.