The process of separating insoluble solids from a liquid. The solution is poured into a filter tunnel with filter paper in it. The filter paper lets the liquid through, but not the solid, separating the two.
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What is crystallisation?
The process of separating a soluble solid from a liquid. The solution is heated or left for a long time, leaving the liquid to evaporate leaving the solid crystallised.
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What is simple distillation?
The process of separating a liquid from a solid, if we want to keep the liquid. The solution is heated , evaporating the liquid, and the liquid is then condensed by cooling.
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What is fractional distillation?
The process of separating two liquids with different boiling points. The mixture is heated to a temp. That evaporates one liquid and not the other. The liquid that has been evaporated is now condensed.
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What is chromatography?
The process of separating two different substances based on their solubilities.
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How is chromatography done?
A pencil line is drawn near the bottom of the chromatography paper. Put the first and second colour on the pencil line. Place the bottom of the paper in a solvent. The solvent with the inks travel up the paper, separating the different inks
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What was the Plum Pudding Model?
The old model of what scientists used o think atoms looked like, which was a ball of positive charge with electrons imbedded in the ball.
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What is the Alpha-Scattering Experiment?
Alpha particles are fired at gold-foil. Most alpha particles passed through the the gold-foil with no change in direction, but some did change direction or bounce off the foil.
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What does the Alpha-Scattering Experiment tell us?
Most of atoms are empty space. The centre of the atom has a positive charge and has a great deal of mass.
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Describe the model of the atom
The centre of the atom, the nucleus contains protons and neutrons, so the overall charge of the nucleus is positive. The nucleus is surrounded by energy levels, where electrons are.
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Why does the atom have no overall charge?
There are always the same amount of protons as electrons, and their charges cancel each other out.
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What are the relative charges of protons, neutrons and electrons?
Protons +1, Neutrons 0, Electron -1
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What is the relative mass of a proton, electron and a neutron?
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