Term 2 practical Sciene Techniques Flashcards

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1
Q

Filtration

A

Filtration separates an ??? Solid from a liquid

Eg sand and seawater

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2
Q

What equipment do you need for filtration

A

Conical flask
Funnel
Filter paper
Beaker containing the mixture to be filtered

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3
Q

Evaporation

A

Used to separate mixtures

When a solution is hearted the liquid starts to evaporate

Separates out the liquid but does not keep the liquid

Example: drying laundry in the wind

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4
Q

Equipment needed for separating mixtures by evaporation

A

Shallow evaporating dish

Bunsen burner

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5
Q

Paper chromatography

A

Used to separate mixtures or compounds

Best Used to separate inks, dyes and colouring agents in foods

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6
Q

Describe separating by paper chromatography

A

Put a spot of mixture near the bottom of chromatography paper

Place the paper upright in a suitable solvent eg water

As the solvent soaks upwards on the paper it carries the mixtures it

Differ the components of the mixture move at different rates so they get separated out

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7
Q

Name 3 uses for separating mixtures of compounds by paper chromatography

A

Crime scene analysis

Checking the purity (how pure) a product is

Measuring environmental pollutants

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8
Q

What is Distillation

A

Process using heat ti separate a pure liquid from an mixture of liquids or a solid

Liquids must have different boiling point

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9
Q

Name the four stages of distillation

A

Heating

Evaporation

Cooling

Condensing

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10
Q

Name 5 practical techniques for separating mixtures or compounds

A

Filtration

Evaporation

Paper chromatography

Distillation

Magnetism

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11
Q

What is the main difference between

Evaporation

Distillation

A

Evaporation don’t keep the liquid

Distillation capture the liquid and cool it - condense

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12
Q

What is magnetic separation

A

Uses magnet to separate out magnetic items from non magnetic ones

Eg iron filings and sulphur - the magnet will pull out all the iron filings

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13
Q

What equipment do you need for distalation

A

Side arm flask

Condenser

Bunsen burner

Beaker for the cool liquid after condensation

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