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Elements, Compounds and Mixtures flashcards
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- 1What is a compound made up of?A compound is made up of 2 or more elements chemically combined. e.g Water
(2 hydrogen atoms 1 Oxygen) - 2Have compounds got different properties to the elements they're made up of? And why?Yes - because when the elements join, the atoms lose their individual properties and have different properties from the elements they are composed
- 3Do compounds have fixed chemical formulas? And why?They do have fixed formulas - Because they have fixed compositions which means that because they are chemically combined which they can then be made into simpler substances 'reactions'.
- 4What is Chromatography?Chromatography is a technique of separating two or more solids which can be seen in a solution (only a little).
- 5Whats the difference between: Solution, Solute and Solvent.Solution : A dissolved solid in a liquid.
Solute : Solid (dissolved) in a solution.
Solvent : Liquid in which solute (solute solid) dissolves. - 6Do all black inks contain the same chemicals?No its shown when you put filter paper in water.
- 7Give some examples of separation techniques?Sifting, Filtering, Dissolving, Chromatography, Evaporating and freezing.
- 8What is the process of making seawater to freshwater?Desalination - Desalination is a process that extracts minerals from sea water. More generally, desalination refers to the removal of salts and minerals.
- 9What is simple distillation?Simple distillation is when the water evaporates from the solution, but is then cooled and condensed into a separate container. The salt does not evaporate and so it stays behind
- 10What is fractional distillation?fractional distillation separating two or more liquids from each other. This method works because the two liquids have different boiling points.
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- Year 8 Chemistry Fichas sobre Elements, Compounds and Mixtures flashcards , creado por olivia blunt el 30/04/2017.
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- olivia blunt
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