C1 PPQ Mistakes
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Bauxite contains between 15% and 25% aluminium. Aluminium oxide always contains 53% aluminium. How does this show that bauxite is a mixture and not a compound?
Bauxite contains a variable percentage of aluminium
How did Rutherford disprove the plum pudding model
• Most alpha particles went through • Therefore most of the atom must be empty space • however some of the particles were reflected • the nucleus is dense, small and positive
what group are the halogens
7
Compare plum pudding model and nuclear model
Both • contain electrons • overall neutral Differences • PP = no nuclues • PP = no nuetrons • PP= has postive charge spread throughout the atom • nuclear = positive charge in the centre • PP= electrons randomly distributed • nuclear = in energy shells • PP= mass spread throughout • nuclear = concentrated in centre • PP= no empty space • nuclear = mostly empty space
What is the name of the atomic model that has elctrons in outer shells + positive nueclues
• Bohr • Rutherford-Bohr
Atom: John Dalton
atoms are solid invisible spheres
Atom: JJ Thompson
Plum pudding • Sphere/ball of +ve charge • -ve e- embedded into it
Atom: Rutherford
Gold alpha particle • Most straight through = atom is mostly empty space Model • Randomly placed electrons • Positive nucleus
Atom: Bohr
e- orbit nucleus at specific disatnces
Atom: Chadwick
Discovered Neutrons • explained isotopes
radius of atom
0.3 nm