Purity and separating mixtures

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Question 16

Medium

The table below shows information about the properties of four substances, labeled W, X, Y, and Z.

Substance	Melting point ( $∘C^\circ\text{C}$ )	Boiling point ( $∘C^\circ\text{C}$ )	Solubility in water	Does the substance conduct electricity?
W	$- 97$	$65$	Soluble	No
X	$- 114$	$78$	Soluble	No
Y	$772$	$1935$	Soluble	Only when molten or dissolved in water
Z	$1085$	$2562$	Insoluble	Yes, in both solid and liquid states

Identify which separation technique should be used to separate a liquid mixture of substance W and substance X.

[1]

Describe a method that could be used to separate a dry mixture of solid substance Y and solid substance Z to obtain pure samples of both.

[3]

A student separates substance Y from a sample of a mixture. They start with $g9.5\text{ g}$ of the mixture and obtain $g3.8\text{ g}$ of pure substance Y.

Calculate the mass of pure substance Y that could be separated from $g14.8\text{ g}$ of this same mixture. Give your answer to $3$ significant figures.

[2]

Based on their physical properties, identify the type of structure and bonding for substances W, Y, and Z from the following list:

giant covalent
ionic
metallic
polymer
simple covalent

[3]

Purity and separating mixtures

Question 16

Purity and separating mixtures Questions

Purity and separating mixtures

Question 16

Purity and separating mixtures Questions