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21 Cards in this Set
- Front
- Back
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Which is easier to separate: compounds or mixtures? |
Mixtures are easier as they are not chemically bonded |
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What type of paper should you do paper chromotography on? |
Filter paper |
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What should the line on paper chromotography be drawn with? Why? |
A pencil as it is insoluble and won't dissolve with the solvent |
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What should chromotography paper be placed in? How much of the paper should be submerged? |
1)A solvent such as water 2)only a small amount should be submerged, not above the pencil line |
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What is the end result of paper chromotography called? |
A chromotogram |
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Other than chromotography, name 4 methods of separation techniques |
Filtration
Evaporation
Crystalisation Distillation |
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Breifly describe filtration |
Filtration - a funnel with filter paper |
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Describe Crystalisation |
Heat solution some liquid evaporates The solution is now more concentrated Allow solution to cool, forming crystals Dry it out in a drying oven and collect crystals |
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Why would you use crystalisation instead of evaporation? |
If the salt (or whatever is being extracted) decomposes when heated |
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In the plum pudding model, were the plums positively or negatively charged? |
Negatively, they represented electrons |
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What can be placed inside a distillation fractionating column? |
Glass rods |
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What can you use to cool the vapour in distillation? |
Cold water being sent into a condenser |
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As you go down a period (row) of the periodic table, what happens to the atom? |
It gains an extra shell |
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As you go down group 1 elements, what happens to reactivity? |
It increases as the single electron is further away and easier to use |
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What happens to reactivity as you go down group 7 elements? |
Reactivity decrease |
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As you go down the periodic table what happens to boiling/melting point? |
It increases |
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What is the nickname for group 1 metals? |
Alkali metals |
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What is the nickname for group 7 elements? |
Halogens |
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What is the nickname for group 0 elements? |
Nobel gasses |
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Are group 0 elements reactive? |
Not at all |
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3 properties of metals |
Conduct heat and electricity Strong and malleable (malleable when pure) High boiling and melting points |
