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C1: Quiz 6 – Answers
C1: Quiz 6 – Answers
1)
a) Soluble – a solid that is able to dissolve in a solvent (usually water)
b) Insoluble – a solid that is not able to dissolve in a solvent (usually water)
c) Sugar is soluble, and sand is insoluble
2)
a) Filtration
b) Place a funnel on top of a flask/ beaker
Line the funnel with filter paper
Pour the solution containing the insoluble solid into the funnel
The insoluble solid will be left on the filter paper (it is known as the residue)
The liquid (and any soluble solids) will pass through the filter paper into the flask/ beaker (this is known as the filtrate)
3)
a) We would use crystallisation if the soluble solid that we are separating from the mixture breaks down/ decomposes in the presents of heat
b) Pour the mixture containing the soluble solid into an evaporating dish
Heat the solution using a Bunsen burner so that the water evaporates
Keep heating the evaporating dish until you have dry crystals
c) Pour the mixture containing the soluble solid into an evaporating dish and gently heat the solution using a Bunsen burner
Remove the evaporating dish from the heat when you see crystals starting to form (the point of crystallisation) and leave the solution somewhere to cool
Filter out the crystals and leave them in a warm place to dry (we can use a drying oven or a desiccator to speed up this part of the process)
4) Grind the rock salt up to make the salt crystals small so that the salt crystals dissolve well in water
Add the grinded rock salt to some water and stir
Filter the solution, which will result in the sand remaining on the filter paper
The solution that passes through the filter paper (the filtrate) will be water with dissolved salt. We can obtain the salt from the filtrate by using either evaporation or crystallisation
a) Soluble – a solid that is able to dissolve in a solvent (usually water)
b) Insoluble – a solid that is not able to dissolve in a solvent (usually water)
c) Sugar is soluble, and sand is insoluble
2)
a) Filtration
b) Place a funnel on top of a flask/ beaker
Line the funnel with filter paper
Pour the solution containing the insoluble solid into the funnel
The insoluble solid will be left on the filter paper (it is known as the residue)
The liquid (and any soluble solids) will pass through the filter paper into the flask/ beaker (this is known as the filtrate)
3)
a) We would use crystallisation if the soluble solid that we are separating from the mixture breaks down/ decomposes in the presents of heat
b) Pour the mixture containing the soluble solid into an evaporating dish
Heat the solution using a Bunsen burner so that the water evaporates
Keep heating the evaporating dish until you have dry crystals
c) Pour the mixture containing the soluble solid into an evaporating dish and gently heat the solution using a Bunsen burner
Remove the evaporating dish from the heat when you see crystals starting to form (the point of crystallisation) and leave the solution somewhere to cool
Filter out the crystals and leave them in a warm place to dry (we can use a drying oven or a desiccator to speed up this part of the process)
4) Grind the rock salt up to make the salt crystals small so that the salt crystals dissolve well in water
Add the grinded rock salt to some water and stir
Filter the solution, which will result in the sand remaining on the filter paper
The solution that passes through the filter paper (the filtrate) will be water with dissolved salt. We can obtain the salt from the filtrate by using either evaporation or crystallisation
Questions
1)
a) What does soluble mean?
b) What does insoluble mean?
c) Out of sand and sugar, which is soluble in water and which is insoluble in water?
2)
a) What is the name of the method that we would use to separate an insoluble solid from water?
b) Outline the steps in this separation technique.
3) We can separate a soluble solid from a liquid by using evaporation or crystallisation.
a) Why would we use crystallisation rather than evaporation?
b) Outline the steps in evaporation.
c) Outline the steps in crystallisation.
4) Rock salt is a mixture of salt and sand. Describe how we can separate rock salt to obtain salt and sand by their selves.
1)
a) What does soluble mean?
b) What does insoluble mean?
c) Out of sand and sugar, which is soluble in water and which is insoluble in water?
2)
a) What is the name of the method that we would use to separate an insoluble solid from water?
b) Outline the steps in this separation technique.
3) We can separate a soluble solid from a liquid by using evaporation or crystallisation.
a) Why would we use crystallisation rather than evaporation?
b) Outline the steps in evaporation.
c) Outline the steps in crystallisation.
4) Rock salt is a mixture of salt and sand. Describe how we can separate rock salt to obtain salt and sand by their selves.