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Balbharati solutions for Class 8 Science chapter 6 - Composition of Matter

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Balbharati Balbharati Class 8 Science - General Science

Balbharati Class 8 Science - General Science - Shaalaa.com

Chapter 6: Composition of Matter

Exercise

Chapter 6: Composition of Matter Exercise Exercise solutions [Page 47]

Exercise | Q 1.1 | Page 47

Choose the appropriate option and rewrite the following statement.

The intermolecular force is _______ in the paricles of solid.

  • Minimum

  • Moderate 

  • maximum

  • indefinite

Exercise | Q 1.2 | Page 47

Choose the appropriate option and rewrite the following statement.

Solids retain their voume even when external pressure is applied. This property is called__________

  • plasticity

  • Incompressibility

  • fluidity 

  • elasticity

Exercise | Q 1.3 | Page 47

Choose the appropriate option and rewrite the following statement.

Matter is classified into the types mixture, compound and element by applying the criterion______________

  • states of matter

  • Phases of matters 

  • chemical compositions of matter

  • all of these

Exercise | Q 1.4 | Page 47

Choose the appropriate option and rewrite the following statement.

Matter that contain two or more constituent substances is called__________

  • mixture 

  • compound

  • element

  • metalloid

Exercise | Q 1.5 | Page 47

Choose the appropriate option and rewrite the following statement.

Milk is an example of type of matter called __________.

  • solution

  • homogeneous mixture

  • heterogeneous mixture

  • suspension

Exercise | Q 1.6 | Page 47

Choose the appropriate option and rewrite the following statement.

Water, mercury and bromine are similar o each other, because three are 

  • liquids

  • compounds 

  •  nonmetals 

  • elements

Exercise | Q 1.7 | Page 47

Choose the appropriate option and rewrite the following statement.

valency of carbon is 4 and that of oxygen is 2. From this, we understand that there are _______ chemical bond/bonds between the carbon atom and one oxygen atom in the compound-carbon dioxide.

  • 1

  • 2

  • 3

  • 4

Exercise | Q 2.1 | Page 47

Identify the odd term out and explain

Gold, silver, copper, brass

Exercise | Q 2.2 | Page 47

Identify the odd term out and explain

Hydrogen, hydrogen peroxide, carbon dioxide, water vapour.

Exercise | Q 2.3 | Page 47

Identify the odd term out and explain

Milk, lemon juice, carbon, steel.

Exercise | Q 2.4 | Page 47

Identify the odd term out and explain.

water, mercury, bromine, petrol.

Exercise | Q 2.5 | Page 47

Identify the odd term out and explain.

sugar, slat, baking soda, blue vitrol.

Exercise | Q 2.6 | Page 47

Identify the odd term out and explain

Hydrogen, sodium, potassium, carbon.

Exercise | Q 3.1 | Page 47

Answer the following question.

Plants synthesize glucose in sunlight with the help of chlorophyll from carbon dioxide and water and give away oxygen. identify the four compounds in this process and name their types.

Exercise | Q 3.2 | Page 47

Answer the following question.

In one sample of brass, the following ingredients were found : copper (70%) and zinc (30%).  Identify the solvent, solute and solution from these.

Exercise | Q 3.3 | Page 47

Answer the following question.

Sea water tastes salty due to the dissolved salt. the salinity (the proportion of salts in water) of some water bodies Lonar lake - 7.9 %, Pacific Ocean 3.5%, Mediterranean sea- 3.8%, Dead sea- 33.7%. Explain two characteristics of mixture from the above information.

Exercise | Q 4.01 | Page 47

Give two examples.

Liquid element

Exercise | Q 4.02 | Page 47

Give two examples.

Gaseous element

Exercise | Q 4.03 | Page 47

Give two examples.

Solid element

Exercise | Q 4.04 | Page 47

Give two examples.

Homogeneous mixture

Exercise | Q 4.05 | Page 47

Give two examples.

Colloid

Exercise | Q 4.06 | Page 47

Give two examples.

Organic compound

Exercise | Q 4.07 | Page 47

Give two examples.

Complex compound

Exercise | Q 4.08 | Page 47

Give two examples.

Inorganic compound

Exercise | Q 4.09 | Page 47

Give two examples.

Metalloid

Exercise | Q 4.1 | Page 47

Give two examples.

Element with valency 1

Exercise | Q 4.11 | Page 47

Give two examples.

Element with valency 2

Exercise | Q 5 | Page 47

Write the names and symbols of the constituent elements and identify their valencies from the molecular formulae given below.

KCl,   HBr,   MgBr2,   K2O,  NaH,   CaCl2,  CCl4,  HI,   H2S, Na2S,   FeS,   BaCl2

Exercise | Q 6 | Page 47

Chemical composition of some matter is given in the following table. Identify the main type of matter from their.

  Name of matter                                             Chemical composition  Main type of matter 
Sea water H2O + NaCl + MgCl2  
Distilled water   H2  
 Hydrogen gas filled  in a ballon H2  
The gas in LPG cylinder C4H10 + C3H8  
Baking soda NaHCO3  
Pure gold    Au  
The gas in oxygen cylinder    O2  
Bronze   Cu + Sn  
Diamond   C  
Heated white powder of blue vitroi   CuSO4  
Lime stone   CaCO3  
Dilute hydrochloric acid  HCL+ H2O  
Exercise | Q 7.1 | Page 47

Write scientific reason.

Hydrogen is combustible, oxygen helps combustion, but water helps to extinguish fire.

Exercise | Q 7.2 | Page 47

Write scientific reason.

Constituent substances of a colloid cannot be separated by ordinary filtration.

Exercise | Q 7.3 | Page 47

Write scientific reason.

Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.

Exercise | Q 7.4 | Page 47

Write scientific reason.

A solid matter has the properties of definite shape and volume.

Exercise | Q 8.1 | Page 47

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method.

C (Valency 4) & Cl (Valency 1)

Exercise | Q 8.2 | Page 47

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method.

N (Valency 3) & H (Valency 1)

Exercise | Q 8.3 | Page 47

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method.

C (Valency 4) & O (Valency 2)

Exercise | Q 8.4 | Page 47

Deduce the molecular formulae of the compound obtained from the following pairs of elements by the cross multiplication method.

Ca (Valency 2) & O  (Valency 2)

Chapter 6: Composition of Matter

Exercise

Balbharati Balbharati Class 8 Science - General Science

Balbharati Class 8 Science - General Science - Shaalaa.com

Balbharati solutions for Class 8 Science chapter 6 - Composition of Matter

Balbharati solutions for Class 8 chapter 6 (Composition of Matter) 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 Maharashtra State Board Balbharati Class 8 Science - General Science 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. Balbharati textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 8 Science chapter 6 Composition of Matter are Concept of Composition of Matter, Types of Compound, Types of Mixtures, Concept of Colloid, Molecular Formula and Valency.

Using Balbharati Class 8 solutions Composition of Matter 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 Balbharati Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board Class 8 prefer Balbharati Textbook Solutions to score more in exam.

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