CHEMISTRY WATER (CLASS 6)

Water cycle: The circulation of water from the Earth's surface to the atmosphere and back to the Earth is called the water cycle.

The driving force behind the water cycle is the heat of the Sun.

Water as the universal solvent:

 Water dissolves a large number of substances. They can be solids, liquids and gases. It is therefore,called the universal solvent. Thus, it can  dissolve solute particles from various sources.

Important definition:

Solvent: The liquid in which a substance dissolved is called the solvent.

Solute: The substance which gets dissolved in a solvent is the solute.

Solution: The resultant mixture obtained when the solute has dissolved in the solvent is called the solution.


Assignments:

a.What is water cycle?

b. Why water is called the universal solvent?

c. Define the following terms : (i) Solute (ii) Solvent (iii) Solution

TRIANGLE (CLASS 6)

CHEMISTRY (CLASS 6)

WATER : EXERCISE

E 2. State the source of water below the earth's surface?
Ans: The sources are springs,well and tube well.

F 2.How is ground water formed? How is it important for people both in urban and rural area?
Ans: Much of the water falling on the Earth reaches the non porous rock belt below the ground. This rock does not allow the water to seep through any further and it accumulates there and formed ground water.

Copy and learn these answers.You will get more answer question after completion of remaining content.

WATER (CLASS 6)

Dear students I am receiving your email. Keep sending your query such that we can incorporate in coming lesson. This is continuation of chapter 5: Water. After completion we will go through the question answer.  

SOURCES OF WATER:

Surface water  

Surface water is water in a river, lake or fresh water wetland. Surface water is naturally replenished by precipitation and naturally lost through discharge to the oceans, evaporation, evapotranspiration and sub-surface seepage.

Although the only natural input to any surface water system is precipitation within its watershed, the total quantity of water in that system at any given time is also dependent on many other factors. These factors include storage capacity in lakes, wetlands and artificial reservoirs, the permeability of the soil beneath these storage bodies, the runoff characteristics of the land in the watershed, the timing of the precipitation and local evaporation rates. All of these factors also affect the proportions of water loss.

Under Ground water

Under Ground water or Sub-surface water, is fresh water located in the pore space of soil and rocks. It is also water that is flowing within aquifers below the water table. Sometimes it is useful to make a distinction between sub-surface water that is closely associated with surface water and deep sub-surface water in an aquifer (sometimes called "fossil water").

Sub-surface water can be thought of in the same terms as surface water: inputs, outputs and storage. The critical difference is that due to its slow rate of turnover, sub-surface water storage is generally much larger compared to inputs than it is for surface water. This difference makes it easy for humans to use sub-surface water unsustainably for a long time without severe consequences. Nevertheless, over the long term the average rate of seepage above a sub-surface water source is the upper bound for average consumption of water from that source.

Key point: Deep ground water is normally safe for drinking.

GEOMETRY (CLASS 6)

EXERCISE 20(A)

2. Can a triangle have the following angles?

 (i) 55⁰,55⁰  and 80⁰

Solⁿ. A triangle can have the given angles, if the sum of these angles is 180⁰

55⁰+55⁰+80⁰=190⁰≠180⁰

A triangle cannot have following angles.(Ans)

SOLVE THESE SUM :  (ii) 33⁰,74⁰ and 73⁰   (iii) 85⁰,95⁰ and 22⁰

3. Find x, if the angles of a triangle are:

(i) x⁰,x⁰, x⁰

Solⁿ.  

x+x+x =1

Or, 3x=180

 Or, x=60

Therefore x⁰=60⁰ (Ans)

SOLVE THESE SUM :   (ii) x⁰   ,2x⁰ and 2x⁰     (iii) 2x⁰,4x⁰ and 6x⁰

RATIO (CLASS 6)

As per request by email

CHAPTER:8   RATIO: EXERCISE 8(A)

1. Express each of the following ratio in simplest form:

(ii) 48:54 (iii) 200: 250 (iii) 3 m: 90 cm

4. The strength of a class is 65,with 30 girls and remaining boys.Find the ratio between the no. of:
(i) girls and boys (ii) boys and the whole class (iii) whole class and girls

6. Reduce the following ratios to its lowest terms:

(i) 1 hour 20 min : 2 hours

(ii) 4 weeks : 49 days

KEEP ON SOLVING THESE PROBLEMS. I WILL ALSO CONTINUE CHAPTER 20.

GEOMETRY MATHS (CLASS 6 )

Dear students this is chapter 20. Go through this content and see page no 175, 176,177 and 178 to know more.

 TRIANGLE                  

A triangle is one of the basic shapes in geometry: a polygon with three corners or vertices and three sides or edges which are line segments.

Types of triangles according to their angles.

A right triangle has one of its interior angles measuring 90° (a right angle).

A triangle that has all interior angles measuring less than 90° is an acute triangle or acute-angled triangle

A triangle that has one interior angle that measures more than 90° is an obtuse triangle or obtuse-angled triangle.

            

                                                                      

Types of angles according to their sides.

In an equilateral triangle all sides have the same length.

In an isosceles triangle, two sides are equal in length.

In a scalene triangle, all sides are unequal, and equivalently all angles are unequal.

                                  

      Obtuse triangle Right triangle 

                                            Acute triangle
  Equilateral triangle         Isosceles triangle   
             

                                    Scalene triangle  

SCIENCE (CLASS 5)

4. b. How can friction cause damage to a machine?

Ans. The moving parts wear out due to friction causing damage to a machine.

c. What is work? Is it a work when you read a book? Why?

Ans. Work is said to done only when a force is applied to the body makes it move.

No. This is because there is no movement.

WATER SCIENCE (CLASS 6)

Dear students this is the new chemistry chapter (page no 55). Read the chapter, note and underline important points. If you have any problem call me or send email. Here are some more important facts about water.

WATER

Water, common name applied to the liquid state of the hydrogen-oxygen compound H₂O. The ancient philosophers regarded water as a basic element typifying all liquid substances. Scientists did not discard that view until the latter half of the 18th century. In 1781 the British chemist Henry Cavendish synthesized water by detonating a mixture of hydrogen and air. However, the results of his experiments were not clearly interpreted until two years later, when the French chemist Antoine Laurent Lavoisier proved that water was not an element but a compound of oxygen and hydrogen. In a scientific paper presented in 1804, the French chemist Joseph Louis Gay-Lussac and the German naturalist Alexander von Humboldt demonstrated jointly that water consisted of two volumes of hydrogen to one of oxygen, as expressed by the present-day formula H₂O.

SCIENCE (CLASS 5)

TENTATIVE SYLLABUS FOR CLASS 5

CHAPTERS:

 8:SKELETAL SYSTEM
9:NERVOUS SYSTEM
10:FORCE AND ENERGY


I hope you have gone through chapter 10 Force and energy. Lots of clarification has been made to make you understand this chapter. Do fill in the blanks yourself (Page no.99). Here are some solved answer from question no. 4 (answer the following)

a. What is the difference between contact and field force? Give one example for each.
Ans. Force that two bodies in contact apply on each other are called contact force. Force that can act between two bodies even when they are not in contact with each other are called field force.

ALGEBRA MATHS ( CLASS 6)

D
Multiply   
Examples:  

a. 5y, 3y² and y³                                                    
  = (5 x 3 x 1). (y x y² x y³)
  = (15). (y¹⁺²⁺³)

  =15.y⁶

  =15y⁶ (ans)

b. – 4 y³, -6 yz, 7y⁵z                                                  

= (-4 x -6 x7 )( y³ x y x y⁵)( z x z)                 

= (168)(y³⁺¹⁺⁵)(z¹⁺¹)                                                            

=168 (y⁹) (z²)

=168y⁹z² (ans)

Use these examples to solve EXERCISE 13 (C) no. 3 (i), (ii),(iii)  and more

I have already discussed how to solve multiplication of two binomials. Here is an example for you

7 (i) x+2 and x+10

  

x+2

x+10

x²+2x

   10x+20

x²+12x+20 (ans)

Do sum no 7 (ii), (iii) (v) in your copy

CHEMISTRY SCIENCE (CLASS 6)

Dear students I hope you have gone through the tentative SECOND CARD syllabus.Here are more questions to revise. 

1   a. State the difference between reversible and irreversible changes.
     b. State the difference between periodic and non periodic changes.
     c. What are physical and chemical changes? Give an example.
     d. Iron expands on heating. Is this physical or chemical change? Explain your answer.
     e. Define the following: i.Endothermic reaction    ii. Exothermic reaction

RATIO MATHS (CLASS 6)

Dear students here are more word problems for you. Follow the steps carefully as you proceed for other sum.

3. The monthly salary of a person is Rs 12000 and his monthly expenditure is Rs 8500.Find the ratio between:(i) salary and expenditure, (ii) expenditure and savings, (iii) savings and salary.

i.   Salary      :    expenditure

    Rs 12000  :   Rs 8500

                 24:17

ii. savings = salary – expenditure =Rs 12000- Rs 8500=Rs 3500

   Expenditure   :   savings

         Rs 8500  :   Rs 3500

                     17: 7

iii.   Savings   :  salary

     Rs 3500   :  Rs 12000

                  7 : 24

Try 3,4,5 in your ex-book

6. REDUCE THE FOLLOWING RATIOS TO ITS LOWEST TERMS:

I.      1 hr 20 min   : 2 hr (convert hr in to min)

    60 min+ 20 min : 2 x 60 min

                80 min  : 120 min(cancel)

                        2   :     3

ii    Hint 1 week =7 days

v                5 kg 500 gm  :  2 kg 750 gm

               (1 kg=1000 gm)

      5 x 1000 gm+500 gm :  2 x 1000 gm+750 gm

                      5500 gm     : 2750 gm

                                       2:1

Remaining sums try on you own

PHYSICS: MACHINE ( CLASS 6 )

 Dear students, machine is new chapter for you. First read the physics book page no.49 and 50.
                                         
                                    
                                     MACHINE

Machine, simple device that affects the force, or effort, needed to do a certain amount of work.

Machines can make a tough job seem easier by enabling a person to apply less force or to apply force in a direction that is easier to manipulate. Machines lessen the force needed to perform work by lengthening the distance over which the force is applied. Although less force is subsequently used, the amount of work that results remains the same. Machines can also increase the speed at which work makes an object travel, but increasing speed requires the application of more effort.

There are four types of simple machines: the lever, the pulley, the inclined plane, and the wheel and axle.

In the next blog I will discuss function of machines. Don’t forget to revise for second card test.

SCIENCE (CLASS 5)

                                                            

     WORK

A-Work is said to done  only when a force is applied to the body makes it move.

B-Energy is the ability to do  work. Types of energy check your book.

Sources of energy –

RENEWABLE ENERGY – is a source of energy that can be reused again.

NON RENEWABLE ENERGY- is a source of energy that cannot be reused again.

MACHINE- IS A DEVICE THAT MAKES OUR WORK EASIER, SAVES TIMES,

AND  USES  LESS EFFORT .

TYPES OF MACHINES-.LEVERS , PULLEY, INCLINED PLANE, WHEEL AND AXLE

 SCREW , WEDGE.

OUT OF THIS LEVERS  ARE IMPORTANT WHICH WE USE  

IN DAY TO DAY  OF OUR LIFE.

You need to know F,L , E- FROG LAYS EGGS

1^st  class lever- when the fulcrum is in the middle.

2^nd class lever- when the lever is in the middle.

3 rd class lever- when the effort is in the middle.

GO THROUGH YOUR BOOK YOU WILL UNDERSTAND BETTER.

DO THE EXERCISE NO 1 ,2,3 ,4,5 IN YOUR SCIENCE EX-BOOK

 .

GEOMETRY CLASS 6

SCIENCE (CLASS 6)

                   Tentative syllabus for  SECOND CARD TEST

BIOLOGY:                    CHAPTERS 4: CLASSIFICATION OF PLANTS

                                                           5: THE STRUCTURE AND FUNCTIONS OF PLANTS PARTS

CHEMISTRY:                  CHAPTER 4: CHANGES IN THE WORLD AROUND US

PHYSICS:                         CHAPTER 4: WORK AND ENERGY

Dear students first revise these chapters. Remember what I said in the classroom. We have completed all answer questions.

SCIENCE (CLASS 5)

                                 SAMPLE TEST PAPER

1 a.What is the functions of the skeleton?

   b. What are the different parts of a skeleton?

   c. What is cartilage?

   d. Write the difference between:

         (i) Voluntary and Involuntary muscles 

         (ii) Tendons and ligaments

2 a.What is the importance of the following pares of our body?

(i)         The optic nerve    

(ii)        The cerebellum

b. Give reasons:

      (i)We cannot smell when we have a cold.

      (ii) We should not clear our ear with a sharp pin.

c. What are the main parts of the nervous system?

d. What is reflex action?

RATIO (CLASS 6)

                                           WORD PROBLEM

EXERCISE 8(A)

2. A field is 80 m in length and 60 in width. Find the ratio between its width and its length.

Solution

Given,   length = 80 m

             width = 60 m

    Required ratio =width ∕ length

                          = 60 m ∕ 80 m

                          =3/4

                          =3:4   (Answer)

 Try sum no. 3

RATIO (CLASS 6)

FORCE AND ENERGY (CLASS 5)

FORCE

       FORCE IS A PUSH OR PULL OF A BODY.

                 e.g pushing and pulling of a table.

          EFFECTS OF FORCE

                     1.FORCE CAN MAKE A STATIONARY BODY MOVE .e.g. moving a table

                            2.FORCE CAN CHANGE THE SHAPE OF THE

OBJECT.e,g using  a paper   to make a ball

                                    3.FORCE CAN STOP A MOVING BODY .e.g  a

boy running and being stopped by his friend

                                                4.FORCE CAN CHANGE THE DIRECTION

OF A MOVING OBJECT .e.g  while batting the balls goes in all the direction

UNIT OF FORCE:

Force is a physical quantity that can be measured. The SI unit of force newton,whose symbol is N.

TYPES OF FORCES

1.Contact force- The force produced through contact.

Very important contact force is frictional force.

2.Field force-When two objects interact without touching each other.

                                        A . Magnetic force –The force produced

through a magnet. e.g.use magnet  to attract the nails.

                          B. Gravitational force- The force produced by the

gravitational pull of the earth. E.g  you throw a ball up in the air it comes down.

                C. Electrostatic force –The force produced  by the electrostatic, by getting a body charged.. E.g a tiny bits of paper,rub the

 plastic ruler   on your hair. The ruler gets charged and it attracts

the paper  to it.

D.Muscular force- The force produced by muscles.e.g lifting of a stone

Assignments:

a.What is force? Write the SI unit of force.

  

b. What is contact force?

c.Define gravitational force.

SAMPLE TEST PAPER

Class:  6
Subject:  Science


Answer the following question:
1   a. State the difference between reversible and irreversible changes.
     b. What are physical and chemical changes?
     c. Iron expands on heating. Is this physical or chemical change? Explain your answer.
     d. Define the following: i.Endothermic reaction    ii. Exothermic reaction

2   a.When is work done by force?
     b.What are potential and kinetic energy?
     c. What is chemical energy? Where did the chemical energy stored in coal and petroleum come from?
     d.A man pushes a card with a horizontal force of 20 N. How much work does he do in moving the card through a distance of 50 m?

3  a.What is  meant by pollination? Mention some agent of pollination.
    b.What is fertilization?What is the result of fertilization?
    c.What are the function of roots?
    d. Why potato regarded as a stem?
    e.Draw and label the parts of a typical flower.