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Year 9 Chemistry Revision - Coggle Diagram
Year 9 Chemistry Revision
Separation techniques
Crystallisation- to get a solute from a solution
Simple distillation- to get a solvent from a solution
Filtration- to separate insoluble solids from liquids
Fractional distillation- to separate liquids
Chromatography- to separate soluble solids
Atom
Proton- Positively charged and mass of 1
Electron- Negatively charged and mass negligible
Neutron- Neutral charge and mass of 1
Key terms
Element- a substance made from a single type of atom
Compound- a substance made from two or more types of atom which are chemically bonded together
Mixture- two or more substances mixed but not chemically bonded together
Solvent- a substance that dissolves another substance to form a solution
Solute- a substance that has been dissolved
Molecule- two or more covalently bonded atoms
History of the atom
1911- Ernest Rutherford- Nuclear Model
1904- J.J. Thompson- Plum Pudding Model
1913- Niels Bohr- Planetary Model
1803- John Dalton- Solid Sphere Model
Outer shells of an atom
3rd shell- 8 electrons max
2nd shell- 8 electrons max
4th shell- 2 electrons max
1st shell- 2 electrons max
Key point
Number of neutrons- atomic number
Number of protons- atomic number
Number of electrons- mass number subtract the atomic number