Selina solutions for Concise Chemistry [English] Class 6 ICSE chapter 5 - Pure Substances and Mixtures; Separation of Mixtures [Latest edition]

Select homogeneous and heterogeneous mixtures from the following:

The salt solution, petrol, and water, sand, and charcoal, alcohol and water, air dissolved in water, air, seawater, fruit juices, mist, brass.

Define the following:

Pure substance

Define the following:

Impure substance

Define the following:

Alloy

Define the following:

Solution

Define the following:

Heterogeneous mixture

Define the following:

Homogeneous mixture

List four characteristics of a mixture.

Give reason:

Why do sugar and water retain their individual properties in a sugar solution?

Give reason:

Why do petrol and water form a heterogeneous mixture?

Give reason:

Why sulphur does dissolve when carbon disulphide is added to a mixture of iron and sulphur but not when it is added to iron sulphide?

Give two examples of the following type of mixture.

solid-solid

Give two examples of the following type of mixture.

solid-liquid

Give two examples of the following type of mixture.

liquid-gas

Give two examples of the following type of mixture.

gas-gas

Name the components present in the following mixture:

Brass

Name the components present in the following mixture:

Duralumin

Name the components present in the following mixture:

Tap water

Name the components present in the following mixture:

Bronze

Name the components present in the following mixture:

Crude petroleum oil

State three differences between water and air.

State four differences between compounds and mixtures.

Define Filtration

Define Sublimation

Define Evaporation

Define Crystallisation

Define Miscible liquids

Define Immiscible liquids

Why do we need pure substances?

Give one example of the following type of mixture.

Solid-solid heterogeneous mixture

Give one example of the following type of mixture.

Solid-liquid heterogenous mixture

Give one example of the following type of mixture.

Solid-liquid homogeneous mixture

Name the process by which the components of the following mixture can be separated.

Powdered glass and sugar

Name the process by which the components of the following mixture can be separated.

Chalk powder and iron filings

Name the process by which the components of the following mixture can be separated.

Chaff and grain

Name the process by which the components of the following mixture can be separated.

Salt and water

Name the process by which the components of the following mixture can be separated.

Wheat and sugar

Name the process by which the components of the following mixture can be separated.

Sand and camphor

Name the process by which the components of the following mixture can be separated.

Sugar and water

Name two substances which can sublime.

Name two substances soluble in water.

Name two substances insoluble in water.

Name four substances that can be used as filters.

Give reasons

Sand and sawdust cannot be separated by handpicking.

Give reasons

Magnet is used to separate a mixture of iron and sulphur.

Give reasons

Alum is used in purification of river water.

Fill in the blanks

The substances that make a mixture are called its ______or_________.

Fill in the blanks

_____or ___________ is a process to separate solids dissolved in liquids.

Fill in the blanks

Mist is a _________ mixture of droplets of water and air.

Clay is separated from water by the method of ______.

Fill in the blanks

When cereals are washed before cooking, water is separated from the cereals by ___________.

Fill in the blanks

___________is a process to obtain a very pure form of a solid dissolved in a liquid.

Ammonium chloride can be separated from common salt by the method of ______.

Fill in the blank

The solid particles which remain on the filter paper are called residue and the liquid which passes through it is called ___________.

Fill in the blank

The process of transferring the clear liquid layer above the solid particles which settle at the bottom of the container is known as ___________.

Fill in the blank

______ is a method used for the separation of an insoluble solid from a solid-liquid mixture.

Write “true” or “false” for the following statement

A pure substance consists of only one kind of atom or molecule.

Write “true” or “false” for the following statement

Common salt is separated from its solution in water by decantation.

Write “true” or “false” for the following statement

Winnowing is a process to remove small stones from grains.

Write “true” or “false” for the following statement

Jewellery gold is a homogeneous mixture of metals.

Write “true” or “false” for the following statement

Air can be separated from water by filtration.

Write “true” or “false” for the following statement

Salt and air dissolved in water add taste to water.

Write “true” or “false” for the following statement

Steel is an alloy of iron and aluminum.

Tick (√) the correct alternative from the choice given for the following statement:

The process of adding a chemical substance to help the suspended solid particles to deposit as sediment fastly is called

Tick (√) the correct alternative from the choice given for the following statement:

Salt is separated from seawater by

Tick (√) the correct alternative from the choice given for the following statement:

A mixture of mustard oil and water forms

Tick (√) the correct alternative from the choice given for the following statement:

A heterogeneous mixture is

Tick (√) the correct alternative from the choice given for the following statement:

Example of a homogeneous mixture is

Tick (√) the correct alternative from the choice given for the following statement:

A set of the mixture is

Tick (√) the correct alternative from the choice given for the following statement:

A gas dissolved in a liquid can be separated by

Tick (√) the correct alternative from the choice given for the following statement:

Copper is not a part of the alloy

Tick (√) the correct alternative from the choice given for the following statement:

Which is not a mixture?

Give one word name for the following

The solid which is left on the filter paper after filtration.

Give one word name for the following

The solid particles which separate out from the solution on slow evaporation

Give one word name for the following:

The solid particles that settle at the bottom of the beaker in a heterogeneous mixture of a solid and liquid.

Give one word name for the following

The clean liquid which is poured out after sedimentation

Give one word name for the following

The technique used to separate the light particles from heavy particles using the flow of wind

Explain the term mixtures.

Give an example of mixtures of two elements

Give an example of mixtures of two compounds

Give an example of mixtures of elements and compounds.

Differentiate between homogeneous and heterogeneous mixtures with suitable examples.

With reference to the mixture of iron and sulphur, state the main characteristics of the mixture.

Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to the term

Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to existence

Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to properties

Tabulate a comparative chart – to differentiate between elements, compounds, and mixtures. Differentiate them with reference to Separation of compound

State the principle involved in separation of solid-solid mixtures by sieving

State the principle involved in separation of solid-solid mixtures by magnetic separation

State the principle involved in separation of solid-solid mixtures by Sublimation

State the principle involved in separation of solid-liquid mixtures by sedimentation and decantation

State the principle involved in separation of solid-liquid mixtures by filtration

State the principle involved in separation of solid-liquid mixtures by evaporation

Explain the term ‘sieving’. State the structure of a sieve and explain the separation of different sized particles by sieving.

State what is meant by ‘magnetic separation of two mixtures’. Explain how iron particles can be separated from sulphur particles.

Give a reason why sublimable and non-sublimable substances can be separated easily, but two sublimable substance cannot.

Explain the technique for separating – insoluble solid particles in a solid-liquid mixture.

Differentiate between the terms sedimentation and decantation with a suitable experimental technique.

Explain how a solid component is separated in a soluble solid-liquid mixture.

Draw a neat labelled diagram for the separation of the following mixture.

Coarse sand from fine sand

Draw a neat labelled diagram for the separation of the following mixture.

A magnetic particle from a non-magnetic particle

Draw a neat labelled diagram for the separation of the following mixture.

Naphthalene from sodium chloride

Draw a neat labelled diagram for the separation of the following mixture.

Chalk and water using a filter paper

Draw a neat labelled diagram for the separation of the following mixture.

Sand and water without using a filter paper

Draw a neat labelled diagram for the separation of the following mixture.

Common salt from a solution of common salt and water

State the technique involved in separating the following:

Iodine crystals and potassium chloride

State the technique involved in separating the following:

Iron and chalk powder

State the technique involved in separating the following:

Potassium chloride from an aqueous solution of potassium chloride.

State the technique involved in separating the following:

Rice powder from soil particles

State the technique involved in separating the following:

Iron filings from pieces of copper wire

State the technique involved in separating the following:

Large diamonds from very small diamonds

Match the statements in List I with the correct answer in List II.

State whether the following statement is true or false. If false write – the correct statement.

Components in a mixture are present in a definite proportion.

State whether the following statement is true or false. If false write – the correct statement.

Mixture has no definite set of properties.

State whether the following statement is true or false. If false write – the correct statement.

Components in a mixture can be separated by physical and chemical methods.

State whether the following statement is true or false. If false write – the correct statement.

Sodium chloride and water is an example of a mixture of elements and compounds.

State whether the following statement is true or false. If false write – the correct statement.

Heterogeneous mixtures have different composition and properties throughout the mixture.

Name the following

A black non-metallic component of the mixture gunpowder.

Name the following:

A physical method of separating iron from an iron-sulfur mixture.

Name the following:

The component of the soluble solid-liquid mixture, which is lost to the atmosphere on heating.

Name the following:

The component of a naphthalene-sodium chloride mixture, which remains in the evaporating dish when heated together, covered with a funnel.

Name the following:

A mixture of two immiscible liquids

Give reasons for the following:

Naphthalene and camphor cannot be separated by sublimation.

Give reasons for the following:

Sodium chloride cannot be separated out from its aqueous solution by filtration.

Give reasons for the following:

Two varieties of wheat flour cannot be separated by sieving.

Give reasons for the following:

Sulphur and charcoal powder cannot be separated by magnetic separation.

Give reasons for the following:

Both components of a soluble solid-liquid mixture cannot be recovered by evaporation.