chemistry-purification of water and solubility

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what are the problems with desalination of water(remove the salt from it)on a large scale across the world
process uses much more energy than other processes used to produce drinking water so the process is expensive.it causes greenhouse gases whereas normal water treatment plants produce very little.v salty water left when fresh water been extracted is a
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some liquids like ethanol are miscible with water. what does this mean?
they mix with the water and so cannot be easily separated from it. but can be separated by process of distillation.
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describe the process of distillation for a liquid
the mixture is heated+when temp approaches the bp of one of the liquids in mixture that liquid will evaporate+can be collected by condensation.at 100',liquid collected will be pure water.a condenser is used to carry out this procedure.
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describe the process of distillation for ethanol
mixture is heated so ethanol boils at approx 78'.ethanol becomes vapour which rises+travels to the condenser.condemser cools vapour back to a liquid.water is not collected if heat is removed before mixture boils at 100'.drops of liquid ethanol run i
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what is the thermometer used for in the process of distillation?
to take the temp of the vapour so that it can be identified.the cold water entering condenser cools the vapour so it condenses.liquid that condenses is the distillate.
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diagram of distillation in the laboratory
.
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what does desalination mean?
taking salt out of sea water to make it drinkable
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what is meant be the term condensing?
turn it back from a gas into a liquid-opposite of evaporation.
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how is the water going into the condenser different to the water which comes out?
the water going in is cooler
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how does distillation separate a mixture of different liquids
different boiling points
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why does distillation produce pure water but filtration does not?
the impurities are left behind
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what does solute mean?
the substance that is dissolved
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what does solvent mean?
the liquid that dissolves in water
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what does solution mean?
what is formed when a solvent dissolves a solute.
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what does soluble mean?
a substance that WILL dissolve
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what does insoluble mean'?
a substance that will not dissolve
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what does saturated mean?
describes a soluton that will not dissolve any more solute.
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practice graphs-look at mark schemes in book
x
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what does increasing the temp do to the solute?
increases the amount that will dissolve and also increases the rate at which the solute will dissolve.
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finished:)x
x
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Other cards in this set

Card 2

Front

some liquids like ethanol are miscible with water. what does this mean?

Back

they mix with the water and so cannot be easily separated from it. but can be separated by process of distillation.

Card 3

Front

describe the process of distillation for a liquid

Back

Preview of the front of card 3

Card 4

Front

describe the process of distillation for ethanol

Back

Preview of the front of card 4

Card 5

Front

what is the thermometer used for in the process of distillation?

Back

Preview of the front of card 5
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