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

Selina Concise Chemistry - Middle School for Class 7 (2018-19 Session)

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Selina Selina Concise Chemistry - Middle School Class 7 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 7 (2018-19 Session)

Chapter 3: Elements, Compounds and Mixtures

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

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.

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

State four difference between compounds and mixtures.

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

Give two examples for each of the following :
(a) Solid + Solid mixture
(b) Solid + Liquid mixture
(c) 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 this 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 :

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

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 answe

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

Give one word answe

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 .

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

Select the correct alterative

A pure liquid is obtained from a solution by :

  1. evaporation
  2. distillation
  3. Alteration
  4.  crystallisation

Select the correct alterative

Components of crude petroleum can be separated by 

  1. distillation
  2. evaporation
  3. filtration
  4. fractional distillation

Select the correct alterative

Example of a homogeneous mixture is 

  1. tap water 
  2. distilled water
  3.  sand and water
  4. water and oil

Select the correct alterative

In chromatography the filter paper is 

  1. stationary phase
  2. mobile phase
  3. mixture
  4. none of the above

Select the correct alterative

A set of mixture is 

  1.  ink, honey, icecream, milk
  2. tapwater, gold, common salt, alloy
  3.  milk, brass, silver, honey
  4. butter, petroleum, tapwater, iron

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

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 difference in their weights.

Fill in the blank

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

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

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.

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

 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 

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

 Differentiate between the following.

  solution and suspension

 Differentiate between the following.

Supernatant liquid and Fill rate

 Differentiate between the following

Filter Paper  

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

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 ?

We can separate iron metal from non-magnetic impurities by the method of magnetic separation.

Name the substance you will add to speed up sedimentation.

Name the different types of chromatographic techniques.

Chapter 3: Elements, Compounds and Mixtures solutions [Page 0]

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.

Chapter 3: Elements, Compounds and Mixtures

Selina Selina Concise Chemistry - Middle School Class 7 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 7 (2018-19 Session)

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

Selina solutions for Class 7 Chemistry 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 Selina Concise Chemistry - Middle School for Class 7 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing 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 Class 7 Chemistry 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).

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 Chemistry and can use shaalaa.com to keep it handy for your exam preparation

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