atomic structure

what is an element
it is a substance that is made from only one type of atom
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what is a compound
it contains two or more elements chemically combined in fixed proportions
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what is a mixture
consists of two or more elements or compounds not chemically combined together. the chemical properties of each substance in the mixture are unchanged
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what does filtration do
separates an insoluble solid from a liquid
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what does crystallisation do
separates a soluble solid from a liquid
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what does simple distillation do
separates a liquid from a dissolved solid
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what does fractional distillation do
separates two or more liquids which have different boiling points
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what does chromatography do
separates two or more dissolved solids from a solution
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what did Thomson say about the atom
it is a ball of positive charge with negative electrons embedded in it - the plum pudding model
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what did Rutherford, Geiger and Marsden do
they carried out the scattering experiment, where they shot a beam of alpha particles at thin gold foil, if Thomson was correct all of the particles would go straight through
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what did Rutherford, Geiger and Marsden do (2)
some were deflected in different ares, this suggested that plum pudding was not correct and the positive charge was not spread out but concentrated in a tiny area in the centre of the atom called the nucleus and that electrons were on the outside
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what did Bohr say
that electron orbit around the nucleus at specific distances called energy levels or shells
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what happened to the atom after bohr
the positive charge was made up of protons and that there were the same number of protons as electrons, so the atom has no overall charge
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what did chadwick say
in 1932 Chadwick discovered the neutron with have no charge but have mass
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what is an isotope
it is an element with the same atomic number but different mass number
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what is the eqauation for reletaive atomic mass
mass of isotope x abundance
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Card 2

Front

what is a compound

Back

it contains two or more elements chemically combined in fixed proportions

Card 3

Front

what is a mixture

Back

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Card 4

Front

what does filtration do

Back

Preview of the front of card 4

Card 5

Front

what does crystallisation do

Back

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