Year 7 Science

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1.What is rock salt a mixture of?
Salt and sand
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2.What are the similarities and differences of salt and sand?
They are both compounds but salt is soluble and sand isn't
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3.What are the 4 separating method steps?
Grinding - grind up the rock salt with a pestle and mortar, Dissolving - dissolve in beaker and stir, Filtering - filter through filter paper in a funnel, Evaporating - evaporate in an evaporating dish
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4.What happens in the first part of this method?
The sand doesn't dissolve so it stays big and this doesn't fit through the tiny holes in the filter paper so stays there.
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4. What else happens in this method?
The salt dissolves in its solutionso it goes through and when the water evaporates the salt forms as crystals in the dish, CRYSTALLISATION.
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4. What are the examples of this?
Filter coffee or tea strainers or drain gates
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5.Do all dyes in inks wash through paper at the same rate, if not what does happen?
No some stick to the paper and others will travel through it quickly because some dyes are lighter
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6.Explain the method of chromatography you do in school
1. Put spots of ink on a line on filter paper 2. Roll the sheet up and put in beaker 3. The solvent seeps onto the paper carrying the dyes with it 4. Each different dye will form a spot in a different place
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7.What does simple distillation do?
it separates a mixture of a liquid and a solid
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8.Explain what happens briefly
The liquid is heated and boils off, it's then cooled, condensed and collected leaving the solid behind
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Other cards in this set

Card 2

Front

2.What are the similarities and differences of salt and sand?

Back

They are both compounds but salt is soluble and sand isn't

Card 3

Front

3.What are the 4 separating method steps?

Back

Preview of the front of card 3

Card 4

Front

4.What happens in the first part of this method?

Back

Preview of the front of card 4

Card 5

Front

4. What else happens in this method?

Back

Preview of the front of card 5
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