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Key Stage 3 Science

True or False? A mixture is made of more than one substance joined together. FALSE
Which type of mixture has an opaque appearance? Colloid
What happens to the solid in a suspension? It settles out
Which separation method is used to separate an undissolved solid (e.g. sand) from a liquid? Filtration
Name the 3 pieces of apparatus that are needed for filtration. Filter paper, Filter funnel, Conical Flask(or Beaker)
A solution is formed by dissolving a salt in water. What is the solute in this example? Salt
A solution is formed by dissolving a salt in water. What is the solvent in this example? Water
What word is used to describe a solid that cannot dissolve in a liquid? Insoluble
What is a saturated solution? A solution that contains so much dissolved solute that no more solute can dissolve in it.
How does temperature affect the amount of solid that can dissolve in a liquid? The higher the temperature, the more solid can dissolve.
Which separation method is used to separate a dissolved solid (e.g. salt) from a solution? Evaporation
What do you have to do to salt water to evaporate the water? Heat it.
True or False? A mixture is made of more than one substance not joined together. TRUE
What type of mixture is transparent (see-through)? A solution
What does filtration separate from a liquid? Insoluble solid/undissolved solid
A solution is made by adding as much salt as possible to water until no more dissolves. How would you describe this solution? Saturated
20g of salt is dissolved in 100g of water. What is the mass of the salt solution? 120g
What type of mixture can be separated by evaporation? A dissolved solid from a liquid/a solution.
What separation technique is used to separate a liquid from a mixture? Distillation
What are the two stages of distillation? Evaporation of the liquid, Condensation of the gas.
What is the name of the piece of apparatus labelled ‘A’? Liebig Condenser/Condenser
A solution of salt and water is distilled using the apparatus in question 9. What would you expect to collect in the beaker? Pure water/water
What separation technique would you use to separate the colours in brown ink? Chromatography
Mixture X is separated by chromatography. Which two substances (A,B,C,D)does mixture X contain? C and D
In everyday language what is a "pure" substance? A substance that has had nothing added to it and is in its "natural" state
What do we call a substance that doesn't dissolve? Insoluble
In chemistry what is a "pure" substance? A substance made of a single element or compound
What do we call a substance that does dissolve? Soluble
What do we use to separate an insoluble solute from solution? Filtration
What do we use to separate a soluble solute from solution? Evaporation
What is the solid that dissolves called? Solute
What do we use to separate a solvent from solution? Distillation
What is the liquid the substance dissolves in called? Solvent
What do we use to separate two or more coloured solutions? Chromatography
What do we call a mixture of a solvent and solute together? Solution
What do we call the point where no more solute will dissolve? Saturation point
Give three ways of increasing the rate of dissolving Stir and heat
List the two pieces of equipment needed for filtration 1) filter funnel, 2) filter paper
What is the substance left in the filter paper after filtration called? Residue
What is the liquid that has been filtered called? Filtrate
Is sand soluble or insoluble? Insoluble
List the five pieces of equipment needed for evaporation 1) evaporating basin, 2) tripod, 3) gauze, 4) heat proof mat, 5) Bunsen burner
Is sugar soluble or insoluble? Soluble
Is salt soluble or insoluble? Soluble
What are the two stages of distillation? Heat (evaporate liquid) and then cool (condense)
What are two errors that can occur when carrying out chromatography? Line drawn with a pen, solvent level above the ink being separated
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