Purity and separating mixtures

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Question 40

Medium

A student wants to separate various mixtures of compounds.

Match each separation method to its corresponding mixture:

Separation Methods:
1. Simple distillation
2. Paper chromatography
3. Crystallisation
Mixtures:
- A: A mixture of soluble coloured dyes in an aqueous solution
- B: A solution containing a dissolved solid where we want to obtain the pure liquid solvent
- C: A solution of a soluble solid where we want to obtain pure solid crystals

[3]

The student decides to use simple distillation to separate a mixture of liquids. They set up the apparatus shown in the diagram below:

Diagram of simple distillation setup with labels showing a Bunsen burner flame and a solid stopper.

One of the liquids in the mixture is flammable. Suggest a change the student could make to the heating source to make the distillation safer.

[1]

The student wants to record the boiling point of the pure liquid as it distills. Suggest an improvement the student could make to the distillation apparatus so that they can measure and record this temperature.

[1]

The pure liquid collected is pentane, which has the molecular formula $C5H12\text{C}_5\text{H}_{12}$ and a boiling point of $∘C36\ ^\circ\text{C}$ .

Which two statements about pentane are correct?

The empirical formula of pentane is $CH2\text{CH}_2$ .
The melting point of pentane is higher than $∘C36\ ^\circ\text{C}$ .
Pentane is a chemical element.
Pentane is a compound containing only carbon and hydrogen.
Pentane will be a gas at temperatures above $∘C36\ ^\circ\text{C}$ .

[2]

Calculate the relative formula mass of a $C5H12\text{C}_5\text{H}_{12}$ molecule.

Relative atomic masses ( $A_r$ ): $C=12.0\text{C} = 12.0$ , $H=1.0\text{H} = 1.0$ .

[2]

Purity and separating mixtures

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Question 40

Medium

A student wants to separate various mixtures of compounds.

Match each separation method to its corresponding mixture:

Separation Methods:
1. Simple distillation
2. Paper chromatography
3. Crystallisation
Mixtures:
- A: A mixture of soluble coloured dyes in an aqueous solution
- B: A solution containing a dissolved solid where we want to obtain the pure liquid solvent
- C: A solution of a soluble solid where we want to obtain pure solid crystals

[3]

The student decides to use simple distillation to separate a mixture of liquids. They set up the apparatus shown in the diagram below:

Diagram of simple distillation setup with labels showing a Bunsen burner flame and a solid stopper.

One of the liquids in the mixture is flammable. Suggest a change the student could make to the heating source to make the distillation safer.

[1]

The pure liquid collected is pentane, which has the molecular formula $C5H12\text{C}_5\text{H}_{12}$ and a boiling point of $∘C36\ ^\circ\text{C}$ .

Which two statements about pentane are correct?

The empirical formula of pentane is $CH2\text{CH}_2$ .
The melting point of pentane is higher than $∘C36\ ^\circ\text{C}$ .
Pentane is a chemical element.
Pentane is a compound containing only carbon and hydrogen.
Pentane will be a gas at temperatures above $∘C36\ ^\circ\text{C}$ .

[2]

Calculate the relative formula mass of a $C5H12\text{C}_5\text{H}_{12}$ molecule.

Relative atomic masses ( $A_r$ ): $C=12.0\text{C} = 12.0$ , $H=1.0\text{H} = 1.0$ .

[2]

Purity and separating mixtures

Question 40

Purity and separating mixtures Questions

Purity and separating mixtures

Question 40

Purity and separating mixtures Questions