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2025 LT 13 Remediation: Separation of Mixtures, Solubility

Total questions: 31

Worksheet time: 30mins

Name
Class
Date
1.

Which of the following techniques may be used to separate a mixture of plant pigments into their individual components?

a)

Filtration

b)

Chromatography

c)

Distillation

d)

Solvent extraction

2.

Separation of mixtures is based on specific properties of the components in the mixture. Which of the following properties is used to separate a mixture of oil and water?

a)

solubility

b)

particle size

c)

viscosity

d)

boiling point

3.

Which of the following substances would be expected to show the LEAST solubility in water?

a)

ammonia (NH3)

b)

iodine (I2)

c)

lithium chloride (LiCl2)

d)

ethanol (C2H5OH)

4.

Describe the process shown here.

a)

chromotagraphy

b)

distillation

c)

filtration

d)

sublimation

5.

Which of the following techniques is used to separate a precipitate from a reaction mixture?

a)

filtration

b)

crystallization

c)

evaporation

d)

distillation

6.

Which of the following techniques could be used to separate a mixture of inks?

a)

filtration

b)

distillation

c)

chromatography

d)

centrifuge

7.

Name the separation method that causes wet clothes on a clothes line to dry

a)

chromatography

b)

distillation

c)

filtration

d)

evaporation

8.

Name the separation technique shown in the diagram.

a)

filtration

b)

evaporation

c)

distillation

d)

chromatography

9.

Dyes in water soluble markers may be separated by means of..

a)

filtration

b)

distillation

c)

chromatography

d)

evaporation

10.

Water and alcohol are easily separated by distillation because of their different:

a)

melting points

b)

densities

c)

boiling points

d)

colors

11.

A student obtains a liquid sample of green food coloring that is known to contain a mixture of two solid pigments, one blue and one yellow, dissolved in an aqueous solution of ethanol. Which of the following lab setups is most appropriate for the student to use in order to separate and collect a substantial sample of each of the two pigments?

a)

b)

c)

d)

12.

Which of the following lab setups is most appropriate for a student to use in order to separate two miscible liquids that have different boiling points?

a)

b)

c)

d)

13.

On the basis of molecular structure and bond polarity, which of the following compounds is most likely to have the greatest solubility in water? (draw Lewis structures if needed)

a)

PH3

b)

CCl4  

c)

NH3     

d)

CH4

14.

A 50 mL sample of C6H14(l) is mixed with a 50 mL sample of H2O(l), and the mixture is shaken vigorously. The two liquids do not stay mixed but instead form two separate layers. The density of hexane is 0.66 g/mL, and the density of water is 1.00 g/mL. A 1.0 g sample of I2(s) is added to the mixture, which is shaken again. Which of the following best predicts what happens to the I2(s)?

a)

I2 will be found mainly in the bottom layer because it will dissolve more in the C6H14(l)

b)

I2 will be found mainly in the top layer because it will dissolve more in the C6H14(l)

c)

I2 will be found mainly in the bottom layer because it will dissolve more in the H2O(l)

d)

I2 will be found mainly in the top layer because it will dissolve more in the H2O(l)

15.

A student obtains a mixture of the liquids hexane and octane, which are miscible in all proportions. Which of the following techniques would be best for separating the two components of the mixture, and why?

a)

Column chromatography, because the higher molar mass of octane would cause it to move down the column faster than hexane.

b)

Paper chromatography, because the liquids would move along the stationary phase at different rates owing to the difference in polarity of their molecules.

c)

Filtration, because the different densities of the liquids would allow one to pass through the filter paper while the other would not.

d)

Distillation, because the liquids would boil at different temperatures owing to the difference in strength of their intermolecular forces.

16.

Based on their Lewis diagrams, which of the following pair of liquids are most soluble in each other?

a)

b)

c)

d)

17.

A student decided to repeat the chromatography experiment using hexane (C6H14) instead of propanone (C3H6O). How would the results of the experiment be affected (if at all)?

 

a)

The leaf extract would not travel on the stationary phase.

b)

Chlorophyll b would travel further up the paper than chlorophyll a.

c)

Carotenoid would travel further than chlorophyll a on the paper.

d)

There would be no change in the results

18.

Which of the following techniques is most appropriate for the recovery of solid KNO3 from an aqueous solution of KNO3?

a)

evaporation to dryness

b)

electrolysis

c)

titration 

d)

filtration 

19.

Based on concepts of polarity and hydrogen bonding, which of the following sequences correctly lists the compounds above in the order of their increasing solubility in water?

a)

Z < Y < X    

b)

X <  Z < Y  

c)

Y < X < Z  

d)

X < Y < Z

20.

Based on the structural formulas, which of the following identifies the compound that is more soluble in water and best helps to explain why?

a)

Propanol, because its molecules can form hydrogen bonds with water molecules but those of ethane cannot

b)

Propanol, because its molecules have a greater mass than the molecules of ethane have

c)

Ethane, because its molecules can fit into the spaces between water molecules more easily than those of propanol can

d)

Ethane, because the electron clouds of its molecules are more polarizable than those of propanol

21.

A student performed a fractional distillation of a mixture of two straight-chain hydrocarbons, C7H16 and C8H18. Using four clean, dry flasks, the student collected the distillate over the volume ranges (A, B, C, and D) shown in the graph. Over what volume range should the student collect the distillate of the compound with the weaker intermolecular forces?

a)

A

b)

B

c)

C

d)

D

22.
Look at the apparatus setup. It cannot be used to separate which of the following mixtures? 
a)
Marble chips from oil 
b)
Alcohol and water
c)
Chalk from sugar solution
d)
Sand and sea water
23.
Which one of the following solids is insoluble in water?
a)
sugar
b)
sand
c)
copper sulfate
d)
salt
24.

Sand and gravel may be separated from each other through using..

a)

a filter funnel

b)

a sieve

c)

an evaporating basin

d)

a distillation

25.

Sodium chloride solid can be separated from silver chloride solid by first adding water to the mixture to dissolve the sodium chloride. The separation then takes place in two stages:

a)
evaporation followed by filtration
b)
 distillation followed by decanting
c)
filtration followed by evaporation
d)
filtration followed by decanting
26.
Which mixture could you separate by adding water and then pouring through a coffee filter?
a)
sand and salt, because the salt would dissolve and the sand would not
b)
baking soda and salt, because they both dissolve
c)
sugar and salt, because they both dissolve
d)
iron fillings and sand, because neither one dissolves
27.

What is the substance that remains on the filter paper after filtration called?

a)

Precipitate

b)

Filtrate

c)

Solution

d)

Suspension

28.

What is the substance collected in the flask after filtration called?

a)

Residue

b)

Filtrate

c)

Solution

d)

Suspension

29.

A substance is soluble if it can be dissolved.

In paper chromatography using water, the most polar solute:

a)

does not move from the start point

b)

stays closest to the start point

c)

travels furthest away from the start point

d)

can be found in the middle of the chromatogram

30.

Which type of Chromatography does this picture represent ?

a)

Thin -layer chromatography

b)

Column chromatography

c)

Paper chromatography

d)

Partition chromatography

31.

What are the two (2) important phases of chromatography ?

a)

mobile and inert phase

b)

flexible and immobile phase

c)

mobile and stationary phase

d)

stationary and indestructible phase

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