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C1: atomic structure (keywords (atom= the smallest particle of the element…
C1: atomic structure
keywords
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mixture= 2 or more substances mixed together, but do not to react together. a mixture is not a pure substance
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the law of conversation of mass= during a reaction, the atoms in there are rearranged into different into different compounds. therefore, mass is never gained or lost in a chemical reaction
separating mixtures
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crystallisation= the liquid (solvent) evaporates away from leaving the soluble solid crystals (solute) behind
simple distillation= separates a liquid from a solution. the solution is heated, it evaporates and then condenses for collection
fractional distillation= separates multiple liquids from a solution, based on boiling points
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the history of the atom
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the discovery of the electron lead to the plum pudding model of the atom, which suggested that the atom was in a ball of positive charge with negative electrons embedded in it
the results from the alpha scattering experiments led to the plum-pudding model being replaced by the nuclear model, which suggested that a small, positively charged nucleus was surrounded by electrons orbiting in shells
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