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Chemistry gcse revision -atoms,elements and compounds
20/10/2022
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All substances are made of atoms, an atom is the smallest part of an element An element is a substance that contains only One sort of a fom and they are found on the periodic table Na = Sodium Most substances are compounds; compounds contain atoms of two or more elements which are chemically combined in fixed proportions - they are represented by numbers and chemical symbols? Chemical formulaⓇ. H-1₂0 Mixtures consist of two or more elements or compounds, which are not chemically combined. -the components in a mixture retain their own properties - Mixtures can be seperated via physical processes: filtration: used to seperate solvible solids from insoluble solics, dissolving salt in water and filtering it. Crystalisation: used to get a soluble solid from a solution, evaporation fractional distillation: used to seperate mixtures with diffrent boiling points. chromatography
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