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20 Cards in this Set
- Front
- Back
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give 3 examples of separation processes |
filtration crystallisation simple distillation fractional distilation and chromatography |
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how can you remove salt from sea water? |
distillation, you could heat the water making the water evaporate and the salt stay behind you could get a tube and let the steam go through there and get it somewhere else again |
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what did the plum pudding model suggest? |
the atom is a ball of positive charge with negative electrons embedded in it. |
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what did the aplha particle scattering experiment lead to |
that the mass of an atom was concentrated at the centre [nucleus] and that the nucleus was charged |
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whose model was the best? |
bohr |
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what is the radius of the nucleus of an atom |
1/10000 |
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what are the elements in group one of the perodic table |
alkali the reactivity goes up when u move down |
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what does group 7 contain |
halogens and all have similar reactions because they all have 7 electrons in their outershell, halogens are non metals |
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what is the equation for effiencieny |
useful energy/total energy x100 |
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work done |
force x distance |
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what is energy measured in? |
jules |
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what is power measured in |
watts |
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what is weight measured in |
neutrons |
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what is mass weight in |
Kg |
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what is the equation for gravitational potential energy |
Ep = mgh |
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power |
P=E/t |
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kinetic energy |
Ek = 1/2 mv^2 |
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what is the mass number? |
protons + neutrons |
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what is an isotope? |
an atom with a different atomic mass |
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name 2 physical things from noble gases |
they are colourless they are gases at room temperatur |
