Year 8-Separation Techniques Flashcards

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1
Q

What does distillation do ?

A

Distillation uses evaporation and condensation to obtain a solvent from a solution.

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2
Q

The process of distillation (using e.g: inky water )

A

As ink has a higher boiling point than water , a heat generator or bunsen burner is used and is needed to evaporate the water -we use their differences to our advantages . As the evaporated water (steam) goes down the condenser , a stream of cold water coming from a water in and ending at a water out as it surrounds a tube -the steam condense as it travels down and cools back into clear pure water in a beaker. whilst the ink is left in the flask.

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3
Q

How do we determine which separation technique to use.

A

Use the properties and differences of the two solvents -and use it to our advantages.

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4
Q

Give example of an advantage of differences (e.g :ink and water )

A

Ink has a higher boiling point , allowing the water to evaporate away -separating from the ink.

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5
Q

Separating techniques for metals from non-metal elements…

Use example iron and sand

A

Most metals are attracted to a magnetic force , (e.g: iron can be separated from sand using a magnet)

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6
Q

A sieve separates …

A

Solids from liquids , e.g water and peas.

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7
Q

Residue is ..

A

The Material blocked out/ filtered through , getting left over.

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8
Q

Solute is :

A

the solid to dissolve

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9
Q

Solvent :

A

The liquid

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10
Q

The solution :

A

The mixture

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11
Q

Liquids with higher boiling points :

A

Evaporate at hotter temperatures

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12
Q

Water boils at ..

A

100°C

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13
Q

Fill the missing words :

Liquids with _________ boiling points

Evaporate at cooler temperatures

A

Lower

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14
Q

How does filtering work

A

E.g : water particles in the liquid state , are smaller than the holes in a filter and passes through ,unlike solids.

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15
Q

An example of a separation through filtering technique.

A

Filtrate - the paper filter with small holes.

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16
Q

Chromatography is the ..

A

It is the separation technique used to separate pen ink into its dyes - this technique is used to check forged cheques.

17
Q

Fractional distillation is a technique that

A

separates a crude oil into different parts, fractions.