Year 11 Chemistry Help?
1. A pure substance that decomposes gently when heated would be classes as:
a. an element
b. a metal
c. a non-metal
d. a compound
e. a mixture of elements
Which of the following processes could best be used to obtain pure water from a solution of sodium chloride and water?
a.Chromatography
b.Filtration
c.Decantation
d.Distillation
e.Evaporation
Which one of the following processes would be the most suitable for separating the different dyes from a sample of black ball point ink?
a. Chromatography
b.Distillation
c.Evaporation
d.Filtration
e.Decantation
A beaker of muddy water contains only dissolved salt and some suspended materials. Which one of the following procedures would be the best way to recover the pure salt?
a.filter first, then decant
b.decant first then filter
c.evaporate first, then filter
d.evaporate first, then decant
e.filter first, then evaporate
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Filed under: Water Filter System
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1. D
2. D
3. A
4. A
1..d)..A compound.
2..d)..Distillation.
3..a)..Chromatography.
4..e)..Filter first, then evaporate (or by simple distillation).
1) If it decomposes into other substances, it can only be a compound, as all the other options are elements which cannot decompose.
2) Distillation
3) Chromatography
4) e, get rid of the suspended material, leaving behind a pure solution of NaCl and water, then evaporate the water leaving behind pure NaCl