14 Fractional distillation cannot be used to _____________.
separate the components of liquid air
refine crude oil
test the purity of a substance
separate methanol and water
15 Angstrom is a unit of ___________.
16 Which one of the following can be separated by adding water, stirring and filtering?
Salt and copper sulphate
Salt and sugar
Copper and tin
Sulfur and sugar
17 In order to dissolve the greatest amount of sugar in a cup of water, you should __________.
use sugar crushed into small pieces, and heat the water
use sugar crushed into small pieces, and cool the water
use sugar in large pieces, and heat the water
use sugar in large pieces, and cool the water
18 Convert 10 kg to mg.
19 Distillation can be used to separate ______________.
a soluble solid from a solution
a liquid from a solution
a solid from a solid
an insoluble solid from a solution
20 The S.I basic unit for luminous intensity is
14. separate the components of liquid air 15. length 16. Salt and sugar 17. use sugar crushed into small pieces, and heat the water 18. 10,000,000 mg 19. a liquid from a solution 20. Candela