Science Separation Techniques

Question 1

In evaporation to dryness, the solute has to be ______

Answer 1

heat stable (doesn’t decompose easily under heat)

Question 2

in crystallisation the thing is heated until ________

Answer 2

saturated (maximum about of solute has been absorbed)

Question 3

In simple distillation, what are the boiling chips for?

Answer 3

to ensure smooth boiling

Question 4

what are the apparatuses used in simple distillation?

Answer 4

distillation flask, Liebig condenser, distillate(comes out)

Question 5

Where must the thermometer be placed and why?

Answer 5

thermometer placed with its bulb at the inlet of the condenser to measure the temperature of the vapour entering the condenser accurately.

Question 6

Water must enter from the bottom because

Answer 6

entire jacket is filled with water and the coldest part of the condenser is just before the vapour escapes

Question 7

what is distilled first, in fractional distillation

Answer 7

lower bp

Question 8

why are there glass beads in fractional distillation

Answer 8

to ensure that the components leave the fractionating column at different times and increase the surface area for vapour to condense

Question 9

if it travels a greater distance, it is_____

Answer 9

greater solubility