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Lesson Posted on 12 Jun CBSE/Class 10/Science

Anamolous behaviousr of Water

Nilesh Jadhav

Around 10 years of experience. I believe in slow and steady wins the race. Strong interpersonal skills...

Water has more density at 4 degrees Celcius temperature. When water approaches towards 4 degrees Celcius temperature, its density keeps on increasing. It becomes maximum at 4-degree celcius.beyond 4 degrees Celcius temperature as we approach towards zero degrees Celcius the density of water decreases.... read more

Water has more density at 4 degrees Celcius temperature. When water approaches towards 4 degrees Celcius temperature, its density keeps on increasing. It becomes maximum at 4-degree celcius.beyond 4 degrees Celcius temperature as we approach towards zero degrees Celcius the density of water decreases. Such behaviour of water is called the unusual behaviour of water.

This behaviour is essential, and it helps the marine life at the polar region to sustain in subzero temperatures as only the water at the surface of water resource only freezes protecting the inner water from losing heat.

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Lesson Posted on 12 Jun CBSE/Class 10/Science

Anamolous behaviour of Water extended

Nilesh Jadhav

Around 10 years of experience. I believe in slow and steady wins the race. Strong interpersonal skills...

The marine life in polar region experiences a temperature difference. The temperature of the surrounding is below zero the temperature inside water is about 4 degrees Celcius throughout. Once this temperature is reached the density of the water remains the same throughout the water. Now the water at... read more

The marine life in polar region experiences a temperature difference. The temperature of the surrounding is below zero the temperature inside water is about 4 degrees Celcius throughout. Once this temperature is reached the density of the water remains the same throughout the water. Now the water at the surface which is exposed to the environment will lose heat and as it loses heat temperature decrease and goes below 4 deg Celcius. Now the water is lighter and remains on the top of, i.e. remains on the surface of the water as water below is denser than it.no convection can happen and hence the surface water starts freezing.

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Lesson Posted on 26 May CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Chemical Reactions and Equations Tuition

Chemical Reaction and Equation

Vinoth

I have completed BCA in MCC and worked in TCS as IT analyst and Last 3 years I am following my ambition....

How to write a Chemical Equation? Representation of a chemical reaction in terms of symbols and chemical formulae of the reactants and products is known as a chemical equation. Zn(s) + dil. H2SO4(aq) → ZnSO4(aq) + H2(↑) (Reactants) (Products) For solids, the symbol... read more

 How to write a Chemical Equation?

Representation of a chemical reaction in terms of symbols and chemical formulae of the reactants and products is known as a chemical equation.

Zn(s) + dil. H2SO4(aq) → ZnSO4(aq) + H2(↑)

(Reactants)                     (Products)

  • For solids, the symbol is "(s)".
  • For liquids, it is "(l)".
  • For gases, it is "(g)".
  • For aqueous solutions, it is "(aq)".
  • For gas produced in the reaction, it is represented by "(↑)".
  • For precipitate formed in the reaction, it is represented by "(↓)".
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Lesson Posted on 19 May CBSE/Class 10/Science

Class 10th Science (Physics) Electricity Short Tricks for Ohm's Law

Sidhant Kumar nishad

I just qualified my intermediate and by profession im student preparing for jee and other govt. jobs. I...

v I R By learning this way you can easily solve the question by hiding the term what to find e.g I want to find VOLT(V) then I hide V we get I and R. Now you will get the answer. read more

                         v

                 I               R 

By learning this way you can easily solve the question by hiding the term what to find 

e.g I want to find VOLT(V) then I hide V  we get and R.

Now you will get the answer.

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Lesson Posted on 11 May CBSE/Class 10/Science

Which is superior voltage or current??

Kumar

Think once, either voltage is superior or current is superior I will help you in realising that with few points.1.voltage can exit without current (emf of charged battery with no connection). (voltage is superior)2. Power=voltage×current (both are important)3. To produce current, voltage... read more

Think once, either voltage is superior or current is superior 💥 💥💥💥
I will help you in realising that with few points.
1.voltage can exit without current (emf of charged battery with no connection). (voltage is superior)
2. Power=voltage×current (both are important)
3. To produce current, voltage is necessary(voltage is superior)

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Answered on 06 May CBSE/Class 10/Science/Unit II: World of Living/Heredity and Evolution

What are the main causes of land degradation in India?

Saurabh

French Trainer who promises to give you a 360 degree french language and culture perspective

Hi,The three key reasons to my mind are:1. Deforestation - as you can see this rampant everywhere - urbanization is leading to deforestation2. Overgrazing3. Mining - Some states have policies around this, but as this brings in a lot of money to the state's, we see it happening a lot everywhere. read more

Hi,
The three key reasons to my mind are:
1. Deforestation - as you can see this rampant everywhere - urbanization is leading to deforestation
2. Overgrazing
3. Mining - Some states have policies around this, but as this brings in a lot of money to the state's, we see it happening a lot everywhere.

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Answered on 19/04/2019 CBSE/Class 10/Science

Danish Sharma

Tutor

Stars are made of very flaming gas. This gas is mostly hydrogen and helium. Stars begin very small -- mere particles in vast clouds of dust and gas. Far from active stars, these nebulae remain cold and inactive for ages. Then, like some sleepy little town in a biker movie, everything stirs up when... read more

Stars are made of very flaming  gas. This gas is mostly hydrogen and helium.

Stars begin very small -- mere particles in vast clouds of dust and gas. Far from active stars, these nebulae remain cold and inactive for ages. Then, like some sleepy little town in a biker movie, everything stirs up when a newcomer speeds through. This disturbance might take the form of a streaking comet or the shockwave from a distant supernova. As the resulting force moves though the cloud, particles collide and begin to form clumps. Individually, a clump attains more mass and therefore a stronger gravitational pull, attracting even more particles from the surrounding cloud.

this process go on and it becomes heavy and gases start to burn

A star is born.

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Answered on 27/04/2018 CBSE/Class 10/Science Tuition/Class IX-X Tuition

Sakthi

Silvering of a mirror is nothing but to deposit a silver coat on a glass sheet or a glass plate .So that it can reflect most of the light.
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Answered on 20 Mar CBSE/Class 10/Science Tuition/Class IX-X Tuition

Charlie

It is to be known that the carbonates that are present in the salt of carbonic acid possessing a carbonate ion. On the other hand, The carbonates of Hydrogen are formed when CO2 is reacting with water. The ethanoic acid combined with carbonates, as well as the carbonates of Hydrogen leads to the production... read more

It is to be known that the carbonates that are present in the salt of carbonic acid possessing a carbonate ion. On the other hand, The carbonates of Hydrogen are formed when CO2 is reacting with water.

The ethanoic acid combined with carbonates, as well as the carbonates of Hydrogen leads to the production of salt, C02 and H20. This salt that is formed is known as the sodium acetate.

CO2(aq)+H2O---> H(+) + HCO3-

2CH3COOH + NA2CO3---> 2CH3COONa+H2O+CO2

CH3COOH+NaHCO3---> CH3COONa+H2O+CO2

Hope this helps

 

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Answered on 23 Mar CBSE/Class 10/Science Tuition/Class IX-X Tuition

Apoorva P.

Corrosion is the decay of metal when it is exposed to the elements in the environment. Scientifically, it is the oxidation of a metal which forms a layer of metal oxide on the top layer. Advantages of corrosion It protects the top layer of the metal. Since the oxide layer is formed on the metal,... read more

Corrosion is the decay of metal when it is exposed to the elements in the environment. 

Scientifically, it is the oxidation of a metal which forms a layer of metal oxide on the top layer. 

 

Advantages of corrosion

  • It protects the top layer of the metal. Since the oxide layer is formed on the metal, it prevents it from further oxidation, by protecting the inner layers. It prevents the air and water from seeping into the inner layers of the metal.
  • sacrificial anodes like the zinc metal are used for such processes. It reacts with the oxygen in the air, to form zinc oxide. This zinc oxide acts as a protective layer and prevents the metal from further corrosion.
  • The process of galvanic corrosion is practised, where two metals are in contact electrically, through an electrolyte. One metal erodes preferentially, compared to another. This prevents the actual metal from being corroded.

 

Disadvantages of Corrosion

  • Due to the reaction with oxygen and other elements in the environment, the purity of the metal is hampered.
  •  A major part of the top layer of the metal is lost, due to corrosion
  • It changes the physical appearance of the metal.
  •  It changes the chemical composition and the appearance of a metal
  • Reduces the life span of the metallic objects and is forced to replace it frequently
  • The metal loses its efficiency.
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