Term 2 practical Sciene Techniques Flashcards
Filtration
Filtration separates an ??? Solid from a liquid
Eg sand and seawater
What equipment do you need for filtration
Conical flask
Funnel
Filter paper
Beaker containing the mixture to be filtered
Evaporation
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
Equipment needed for separating mixtures by evaporation
Shallow evaporating dish
Bunsen burner
Paper chromatography
Used to separate mixtures or compounds
Best Used to separate inks, dyes and colouring agents in foods
Describe separating by paper chromatography
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
Name 3 uses for separating mixtures of compounds by paper chromatography
Crime scene analysis
Checking the purity (how pure) a product is
Measuring environmental pollutants
What is Distillation
Process using heat ti separate a pure liquid from an mixture of liquids or a solid
Liquids must have different boiling point
Name the four stages of distillation
Heating
Evaporation
Cooling
Condensing
Name 5 practical techniques for separating mixtures or compounds
Filtration
Evaporation
Paper chromatography
Distillation
Magnetism
What is the main difference between
Evaporation
Distillation
Evaporation don’t keep the liquid
Distillation capture the liquid and cool it - condense
What is magnetic separation
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
What equipment do you need for distalation
Side arm flask
Condenser
Bunsen burner
Beaker for the cool liquid after condensation
