Describe how the evidence collected from firing alpha particles at thin gold foil caused the plum pudding model of the atom to be replaced by the nuclear model.
[4 marks]
Visual Mark Scheme Breakdown
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sphere with a weak positive charge
electrons embedded
(1 mark)
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They predicted positive alpha particles would pass through the weak positive charge
(1 mark)
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Many went through
This proved the atom had lots of empty space
Some were deflected
Some came back
This proved concentrated mass & POSITIVE charge in the centre.
(Because POSITIVE of the alpha particle and POSITIVE of the nucleus repelled each other).
(1 mark)
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Nuclear Model:
Mainly empty space
Concentrated mass and positive charge in Nucleus
(1 mark)
Continue Revising Paper 1
GCSE Chemistry Visuals
6-marker on the AQA Electrolysis required practical, GCSE Chemistry, to identify products formed at the electrodes.
