Look at the table and answer: Which substance in it is the most soluble?

In the given table, silver nitrate is the most soluble substance amongst all given substances. In 100 g of water at 25 ° C ; 241 . 3 g of silver nitrate dissolves. The amount dissolved is highest as compared to other substances.

Look at the table and answer: Name one other group of salts that are always soluble.

The nitrates, chlorates, and acetates of all metals are soluble in water. The soluble is a substance, i.e., being dissolved, especially easily dissolved in some solvent, usually water.

The diagram below shows a chromatogram for a mixture of amino acids. Amino acid R f value Cysteine 0.08 Lysine 0.14 Glycine 0.26 Serine 0.27 Alanine 0.38 Proline 0.43 Valine 0.60 Leucine 0.73 The solvent was a mixture of water, butanol and ethanoic acid. How will the R f values change if the solvent travels only 6 cm?

The solvent was a mixture of water, butanol and ethanoic acid. The R f value will change if the solvent travels the only 6 cm. The R f value is as follows: 6 . 0 12 = 0 . 5 . The Rf value of a compound is equal to the distance travelled by the compound divided by the distance travelled by the solvent front (both measured from the origin).

E M B I B E

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Checkup on Chapter 2>Q 6

HARD

Upper Secondary: IGCSE

IMPORTANT

Earn 100

A mixture of salt and sugar has to be separated, using the solvent ethanol. Draw a diagram to show how you will separate the salt.

Important Questions on Separating Substances

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Q>Q 1

Explain the term in your own words:

Soluble

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Q>Q 2

Look at the table and answer:

Question Image

Which substance in it is the most soluble?

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Q>Q 2

Look at the table and answer:

Question Image

About how many times silver nitrate is a more soluble substance than potassium sulphate, at $25^{°} C$ ?

EASY

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Q>Q 3

Look at the table and answer:

Question Image

Name one other group of salts that are always soluble.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Q>Q 3

Explain why melting and boiling points can be used as a way to check purity.

HARD

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Checkup on Chapter 2>Q 6

A mixture of salt and sugar has to be separated, using the solvent ethanol. How could you obtain sugar crystals from the sugar solution, without losing the ethanol?

HARD

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Checkup on Chapter 2>Q 6

A mixture of salt and sugar has to be separated, using the solvent ethanol. Draw a diagram of the apparatus used in the experiment of obtaining sugar crystals from the sugar solution, without losing the ethanol.

MEDIUM

Upper Secondary: IGCSE

IMPORTANT

Complete Chemistry for Cambridge IGCSE® Second Edition>Chapter 2 - Separating Substances>Checkup on Chapter 2>Q 8

The diagram below shows a chromatogram for a mixture of amino acids.

Question Image