PHS 7E - Mixtures and Separation Methods

 Filtering separates:

• a liquid from a solution
•   two solids in a mixture
•  a solid from a liquid
•  two liquids in a mixture.

 In the apparatus diagram, what is part ‘X’?

• filter funnel
• conical flask
• filter paper
• a mistake in the drawing.

  What does ‘insoluble’ mean?

•  a solid substance that won’t dissolve in a liquid
•  a liquid that doesn’t dissolve any solids
•   a solid substance that dissolves in a liquid
•   any substance that does not dissolve

  Whipped cream is a mixture of air bubbles dispersed in solid butterfat. What kind of mixture is this?

•   a solution
•   a suspension
•   a colloid
•   none of these

  What do you see when a solid dissolves in a liquid?

•   the solid disappears
•   the solid sinks to the bottom of the liquid
•   the liquid evaporates
• A the liquid changes colour

What is a solute?

•   a liquid that dissolves a solid
•   a mixture of a solid dissolved in a liquid
•   a substance that dissolves in a liquid
•   two liquids that don’t mix together

  A solution is saturated with a solid solute. What happens when more solute is stirred into it?

•   The added solute dissolves.
•   The added solute disappears.
•   The added solute evaporates.
•   The added solute sinks to the bottom.

When heating to dryness, why do you stop heating a solution before all the liquid has gone?

•   to make a concentrated solution
•   to stop the solution getting too hot
•   to stop the evaporating basin breaking
•  to stop the solution spitting

 This chromatogram was made using black ink. How many different coloured inks were in the mixture?

• 4
• 5
• 6
• 7

 What is chromatography used for?

•   to separate a solid from a liquid
•  to separate out dissolved solids
•  to separate a liquid from a solution
•  to separate a mixture of liquids