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

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Concise Chemistry Class 7 ICSE - Shaalaa.com

Chapter 3: Elements, Compounds and Mixtures

Exercise IExercise IIObjective type questionsMultiple choice questionsAdditional questions

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Exercise I

Exercise I | Q 1

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

Exercise I | Q 2

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

Exercise I | Q 3.1

Define: Compounds 

Exercise I | Q 3.2

Define: Elements-

Exercise I | Q 4.1

Name the main metal present in the following :

Haemoglobin                                    

Exercise I | Q 4.2

Name the main metal present in the following:

Chalk   

Exercise I | Q 4.3

Name the main metal present in the following:

 Chlorophyll

Exercise I | Q 4.4

Name the main metal present in the following:

Chocolate wrappers

Exercise I | Q 5

Give four examples of non-metallic elements.

Exercise I | Q 6.1

What do you understand by :

Metalloids 

Exercise I | Q 6.2

What do you understand by :

Noble gases

Exercise I | Q 7

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.

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Exercise II

Exercise II | Q 1

State four difference between compounds and mixtures.

Exercise II | Q 2

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

Exercise II | Q 3.1

Give two examples of the following :

Solid + Solid mixture

Exercise II | Q 3.2

Give two examples of the following:

Solid + Liquid mixture

Exercise II | Q 3.3

Give two examples of the following:

Liquid + Liquid mixture:

Exercise II | Q 4.1

Define: Evaporation

Exercise II | Q 4.2

Define:- Filtration

Exercise II | Q 4.3

Define :- Sublimation

Exercise II | Q 4.4

Define :- Distillation 

Exercise II | Q 4.5

Define :- Miscible liquids

Exercise II | Q 4.6

Define :- Immiscible liquids

Exercise II | Q 5

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
Exercise II | Q 6

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

Exercise II | Q 7

How is distillation more advantageous than evaporation?

Exercise II | Q 8.1

What is chromatography?

Exercise II | Q 8.2

Why is it named so?

Exercise II | Q 8.3

What are the advantages of chromatography?

Exercise II | Q 8.4

Name the simplest type of chromatography?

Exercise II | Q 8.5

On what principle is this method based?

Exercise II | Q 8.6

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

Exercise II | Q 9.1

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

Exercise II | Q 9.2

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

Exercise II | Q 9.3

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

Exercise II | Q 9.4

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

Exercise II | Q 9.5

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

Exercise II | Q 9.6

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

Exercise II | Q 9.7

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 :

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Objective type questions

Objective type questions | Q 1.1

Fill in the blank

_______ are made up of same kind of atoms.

Objective type questions | Q 1.2

Fill in the blank:

________ and _______ are pure substances.

Objective type questions | Q 1.3

Fill in the blank

In a _______ the substances are not combined chemically.

Objective type questions | Q 1.4

Fill in the blank

Clay is separated from water by the method called ______

Objective type questions | Q 1.5

Fill in the blank:

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

Objective type questions | Q 1.6

Fill in the blank

Camphor and ammonium chloride can _______.

Objective type questions | Q 2.1

Give one word answer

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

Objective type questions | Q 2.2

Give one word answer

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

Objective type questions | Q 2.3

Give one word answer

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

Objective type questions | Q 2.4

Give one word answer

The process by which two miscible liquids are separated

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Multiple choice questions

Multiple choice questions | Q 1

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

A pure liquid is obtained from a solution by :

  • evaporation

  • distillation

  • Alteration

  • crystallisation

Multiple choice questions | Q 2

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

Components of crude petroleum can be separated by

  • distillation

  • evaporation

  • filtration

  • fractional distillation

Multiple choice questions | Q 3

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

Example of a homogeneous mixture is 

  • tap water 

  • distilled water

  • sand and water

  • water and oil

Multiple choice questions | Q 4

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

In chromatography the filter paper is 

  • stationary phase 

  • mobile phase

  • mixture

  • none of the above

Multiple choice questions | Q 5

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

A set of mixture is 

  • ink, honey, ice cream, milk

  • tapwater, gold, common salt, alloy

  • milk, brass, silver, honey

  • butter, petroleum, tapwater, iron

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

Fill in the blank

A pure substance has definite _______ and constant _________.

Additional questions | Q 2

Fill in the blank

Mixtures can be ________ or _______ 

Additional questions | Q 3

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.

Additional questions | Q 4

Fill in the blank.

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

Additional questions | Q 5

Fill in the blank

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

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

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

Additional questions | Q 2

Loading is basically speeding up _____.

Additional questions | Q 3

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

Additional questions | Q 4

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

  • True

  • False

Additional questions | Q 5

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

  • True

  • False

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

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

  • a fixed ratio

  • a variable ratio

  • the ratio of 2:1

  • none of these

Additional questions | Q 2

Solutions are

  • heterogeneous mixture

  • compounds

  • homogeneous mixture

  • elements

Additional questions | Q 3

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

  • physical properties and state of the components

  • colour of the components only.

  • state of the components

  • none of these

Additional questions | Q 4

Tick the most appropriate answer

Winnowing is the method used to separate

  • chaff from grain.

  • stones from rice

  • oil from water

  • salt from sand

Additional questions | Q 5

Tick the most appropriate answer.

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

  • distillate 

  • filtrate 

  • sublimate

  • residue 

Additional questions | Q 6

Tick the most appropriate answer.

 Loading is a process in which

  • impurities become heavy and sink to the bottom. 

  • impurities float on the top. 

  • impurities vaporize. 

  • none of these 

Additional questions | Q 7

Tick the most appropriate answer

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

  • size and shape 

  • solubility

  • boiling points. 

  • none of these 

Additional questions | Q 8

Tick the most appropriate answer.

 The different constituents of ink are separated by

  • handpicking. 

  • paper chromatography 

  • filtration 

  • magnetic separation 

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

Fill in the blank

A ________ substance has only one kind of matter.

Additional questions | Q 2

Fill in the blank

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

Additional questions | Q 3

 Fill in the blan

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

Additional questions | Q 4

Fill in the blank

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

Additional questions | Q 5

Fill in the blank

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

Additional questions | Q 6

Fill in the blanks.

Immiscible liquids are separated by using a ________.

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

Write true or false

All pure substances have characteristic melting and boiling points.

  • True

  • False

Additional questions | Q 2

Write true or false

Milk is an emulsion.

  • True

  • False

Additional questions | Q 3

Write true or false

A heterogeneous mixture has a uniform composition throughout the mixture.

  • True

  • False

Additional questions | Q 4

Write true or false

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

  • True

  • False

Additional questions | Q 5

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.

  • True

  • False

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

 Match the columns.

Column A  Column B
1. To separate grain from chaff  a. filtration 
2. To seperat sawdust from water b. sedimentation and decantation  
3. To separate iodine from sodium chloried c. winnowing 
4. To separate iron fillings from sand  d. sublimation  
5.It is used to separate sand and water  e.magnetic separation  
  f. handpiicking 

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

 Differentiate between the following.

  solution and suspension

Additional questions | Q 2

 Differentiate between the following.

Supernatant liquid and Fill rate

Additional questions | Q 3

 Differentiate between the following

Filter Paper  and Alum

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

Is food that we eat a mixture ?

Additional questions | Q 2

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

Additional questions | Q 3

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

Additional questions | Q 4

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

Additional questions | Q 5

Name the substance you will add to speed up sedimentation.

Additional questions | Q 6

Name the different types of chromatographic techniques.

Selina solutions for Concise Chemistry Class 7 ICSE Chapter 3 Elements, Compounds and Mixtures Exercise Additional questions

Additional questions | Q 1

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

Additional questions | Q 2

What are the different types of mixtures ?

Additional questions | Q 3

Why is filtration a better technique than sedimentation and decantation ?

Additional questions | Q 4

How is distillation method different from evaporation?

Additional questions | Q 5

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

Chapter 3: Elements, Compounds and Mixtures

Exercise IExercise IIObjective type questionsMultiple choice questionsAdditional questions
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Concise Chemistry Class 7 ICSE - Shaalaa.com

Selina solutions for Concise Chemistry Class 7 ICSE chapter 3 - Elements, Compounds and Mixtures

Selina solutions for Concise Chemistry Class 7 ICSE chapter 3 (Elements, Compounds and Mixtures) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Chemistry Class 7 ICSE solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Concise Chemistry Class 7 ICSE chapter 3 Elements, Compounds and Mixtures are Identification of Elements, and Compounds - Representation of Their Symbols and Formulae, Concept of Mixtures and Compounds, Difference Between Mixtures and Compounds on the Basis of the Chemical Composition of Constituents, Recall that a Mixture is Formed When Two Or More Substances Are Mixed in Any Proportion, Types of Mixtures -homogeneous and Heterogeneous Mixtures, Types of Mixtures - on the Basis of State: Solid-Solid;Solid-liquid;Liquid-liquid., Separation Techniques - Evaporation, Separation Techniques - Distillation, Separation techniques - use of separating funnel, Separation Techniques - Sublimation, Separation Techniques - Fractional Distillation, Principle Behind Each Separation Technique., Chromatography as a Separation Technique, Concept of Paper Chromatography, Concept of Elements, Compounds and Mixtures (Experimental Techniques), Emphasis on the Principle of Separation, Separation of the Components of a Mixture, Concept of Elements, Compounds and Mixture.

Using Selina Class 7 solutions Elements, Compounds and Mixtures exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 7 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 3 Elements, Compounds and Mixtures Class 7 extra questions for Concise Chemistry Class 7 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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