Contain two or more elements, chemically combined in fixed proportions (a certain amount of one element with a certain amount of another). Formed from elements by chemical reactions. Can only be separated by chemical reactions.
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Mixtures
Contain two or more elements or compounds not chemically combined together. The chemical properties of each substance in a mixture are unchanged. Mixtures can be separated using physical processes, eg. filtration, distillation.
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J. J. Thomson
Plum Pudding Model: Suggested that the atom is a ball of positive charge with negative electrons embedded within it.
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Rutherford
Nuclear Model (Alpha Particle Scattering Experiment): concluded that the mass of an atom was concentrated at the centre (nucleus) and that the nucleus was positively charged. Replaced Plum Pudding Model.
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Niels Bohr
Adapted the nuclear model by suggesting that electrons orbit the nucleus at specific distances. These theoretical calculations agreed with experimental observation.
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Atomic Number
Number of protons (equal to the number of electrons)
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Mass Number
Number of protons + neutrons
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Isotopes
Atoms of the same element with different numbers of neutrons
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Ion
An atom that has lost or gained electrons. Metals will lose electrons to become + ions, non-metals will gain electrons to become - ions.
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Other cards in this set
Card 2
Front
Contain two or more elements or compounds not chemically combined together. The chemical properties of each substance in a mixture are unchanged. Mixtures can be separated using physical processes, eg. filtration, distillation.
Back
Mixtures
Card 3
Front
Plum Pudding Model: Suggested that the atom is a ball of positive charge with negative electrons embedded within it.
Back
Card 4
Front
Nuclear Model (Alpha Particle Scattering Experiment): concluded that the mass of an atom was concentrated at the centre (nucleus) and that the nucleus was positively charged. Replaced Plum Pudding Model.
Back
Card 5
Front
Adapted the nuclear model by suggesting that electrons orbit the nucleus at specific distances. These theoretical calculations agreed with experimental observation.
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