Selina solutions for Concise Chemistry [English] Class 7 ICSE chapter 3 - Elements, Compounds and Mixtures [Latest edition]

Write the symbols of helium, silver, krypton, antimony, barium.

Write the names of following elements Na, C, Kr, U, Ra, Fe, Co.

Define: Compounds 

Define: Elements-

Name the main metal present in the following:

Haemoglobin           

Name the main metal present in the following:

Chalk   

Name the main metal present in the following:

 Chlorophyll

Name the main metal present in the following:

Chocolate wrappers

Give four examples of non-metallic elements.

What do you understand by :

Metalloids 

What do you understand by :

Noble gases

Select elements and compounds from the following list: Iron, plaster of paris, chalk, common salt, copper, aluminium, calcium oxide, cane sugar, carbon, silica, sodium sulphate, uranium, potassium carbonate, silver, carbon dioxide.

State four difference between compounds and mixtures.

What are the characteristic properties of a pure substance? Why do we need them?

Give two examples of the following :

Solid + Solid mixture

Give two examples of the following:

Solid + Liquid mixture

Give two examples of the following:

Liquid + Liquid mixture:

Define: Evaporation

Define:- Filtration

Define :- Sublimation

Define :- Distillation 

Define :- Miscible liquids

Define :- Immiscible liquids

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

1. Iron and sulphur
2. Ammonium chloride and sand
3. Common salt from sea water
4. Chaff and grain
5. Water and mustard oil
6. Sugar and water

How will you separate a mixture of common salt, chalk powder and powdered camphor? Explain.

How is distillation more advantageous than evaporation?

What is chromatography?

Why is it named so?

What are the advantages of chromatography?

Name the simplest type of chromatography?

On what principle is Chromatography method based?

What is meant by stationary phase and mobile phase in chromatography?

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Sublimation

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Filtration

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Sedimentation and decantation

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Solvent extraction method

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Magnetic separation

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

By using a separating funnel

On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used

Fractional distillation :

Fill in the blank

_______ are made up of same kind of atoms.

Fill in the blank:

________ and _______ are pure substances.

Fill in the blank

In a _______ the substances are not combined chemically.

Fill in the blank

Clay is separated from water by the method called ______

Fill in the blank:

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

Fill in the blank

Camphor and ammonium chloride can _______.

Give one word answer

The solid particles which remain on the filter paper after the filtration 

Give one word answer

The liquid which evaporates and then condenses during the process of distillation 

Give one word answer

The process of transferring the clean liquid after the solid settles at the bottom of the container 

Give one word answer

The process by which two miscible liquids are separated

Select the correct alternative from the choices given for the following statement:

A pure liquid is obtained from a solution by :

Select the correct alternative from the choices given for the following statement:

Components of crude petroleum can be separated by

Select the correct alternative from the choices given for the following statement:

Example of a homogeneous mixture is 

Select the correct alternative from the choices given for the following statement:

In chromatography the filter paper is 

Select the correct alternative from the choices given for the following statement:

A set of mixture is 

Fill in the blank

A pure substance has definite _______ and constant _________.

Fill in the blank

Mixtures can be ________ or _______ 

Fill in the blank

Use of a __________ to separate the components of a mixture of solids is based on the difference in the size of the components.

Fill in the blank.

_________ is used when the constituents of a mixture of solids have a difference in their weights.

Fill in the blank

Iodine, camphor, naphthalene, ammonium chloride and dry ice are some substances that _________

Filtration is a method used to separate fine particles of solid from a liquid.

Loading is basically speeding up _____.

Name the techniques used to separate a solid from its solution.

A separating funnel can be used for separating a mixture of immiscible liquids. True or false?

During centrifugation, solid particles of the mixture move towards the bottom. True or false?

The constituents of a mixture are present in a fixed ration.

Solutions are

The methods of separating components of a given mixture are based on the

Tick the most appropriate answer

Winnowing is the method used to separate

Tick the most appropriate answer.

During filtration the substance left behind on the filter paper is called ________.

Tick the most appropriate answer.

 Loading is a process in which

Tick the most appropriate answer

Fractional distillation is used to separate liquids having an appreciable difference in their ______________.

Tick the most appropriate answer.

 The different constituents of ink are separated by

Fill in the blank

A ________ substance has only one kind of matter.

The composition and properties of a _________ mixture is uniform throughout.

 Fill in the blan

An ________ is a homogeneous mixture of two or more metals.

Fill in the blank

Chalk powder dissolved in water is an example of a Chalk powder dissolved in water is an example of a _________.

A _______ is formed when one liquid is dispersed as tiny droplets throughout another liquid

Fill in the blanks.

Immiscible liquids are separated by using a ________.

Write true or false

All pure substances have characteristic melting and boiling points.

Write true or false

Milk is an emulsion.

Write true or false

A heterogeneous mixture has a uniform composition throughout the mixture.

Write true or false

The constituents of a mixture can only be separated by chemical means.

Write true or false

Handpicking can be used as a separation technique if the particle size of the constituents of the mixture is the same.

 Match the columns.

 Differentiate between the following.

  solution and suspension

 Differentiate between the following.

Supernatant liquid and Fill rate

 Differentiate between the following

Filter Paper  and Alum

Is food that we eat a mixture ?

Name two methods by which solid-solid mixtures can be separated.

How can you separate iron metal from non-magnetic impurities ?

Name the technique that you use if only the solid component of a solution is required.

Name the substance you will add to speed up sedimentation.

Name the different types of chromatographic techniques.

What is the difference between a pure substance and a mixture ?

What are the different types of mixtures ?

Why is filtration a better technique than sedimentation and decantation ?

How is distillation method different from evaporation?

What is centrifugation ? Also write the principle on which it works.