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what are all substances made from atoms
periodic table lists all the chemical elements with 8 main groups
elements contain only 1 type of atom
compounds contain more than one type of atom
atom structure tiny nucleus at centre surrounded by electrons
rule of chemical reaction no new atoms are created or destroyed in a reaction
balanced symbol equation the same number of each type of atom on each side of an equation
symbols in balanced symbol equations (s)solid,(l)liquid,(g)gases,(aq)aqueous
mixture two or more substnces not chemically combined
separating mixtures physical means e.g. fitration, crysilisation etc.
fractional distillation sperates miscible liquids, its bossible due to different boiling points
paper chromatography seperates mixture of substances dissolved in a solvent as they move up
chromotography paper
key people on model of the atom dalton, thomson, rutherford and bhor
atoms made of protons, neutrons and electrons
protons charge of +1, relative mass of 1
electrons charge of -1