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Lesson Posted on 27/08/2020 CBSE/Class 11/Science/Chemistry

Conditions for the transfer of heat energy

Claudia

I have a profound knowledge of Math and Science and I am interested in applying my technical and interpersonal...

Whenever there is a temperature difference, there is a transfer of heat energy occurring between two material bodies. Conditions for the transfer of heat energy to occur: Condition 1: Material bodies in contact with a difference in their temperatures. Heat energy is always transferred from a higher... read more

Whenever there is a temperature difference, there is a transfer of heat energy occurring between two material bodies.

Conditions for the transfer of heat energy to occur:

Condition 1:

Material bodies in contact with a difference in their temperatures.

Heat energy is always transferred from a higher temperature region to a lower temperature region.

Mechanism of conduction in a gas :

In a higher temperature region, the molecules of a particular gas have higher velocities, move in a continuous random motion, colliding with each other and exchanging a significant amount of energy and momentum.

Therefore if a molecule moves from a higher temperature region to a lower temperature region, kinetic energy is transferred to the lower temperature region, and this energy transfer takes place until the system attains an equilibrium temperature.

Condition 2:

Material bodies may not be in contact with each other.

Mechanism of convection between a hot metal plate and air/fan :

Hot metal plate kept under a fan cools faster when compared to the hot metal plate in still air.

Here, heat is convected.

The temperature gradient is dependent upon the rate at which the fluid carries the heat away.

Heat transferred from the hot metal plate to the fluid at the wall of the plate is a conduction process, but overall the entire transfer of heat is a convective process.

Convection heat transfer depends upon the viscosity of the fluid and also the thermal properties such as conductivity, specific heat, density etc.

Condition 3:

Heat transfer also occurs in a region where perfect vacuum exists.

Mechanism of radiation:

Electromagnetic radiation which occurs due to temperature difference is called thermal radiation.

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Lesson Posted on 15/07/2020 CBSE/Class 11/Science/Chemistry

Inert Pair Effect

R D Pandey

Proven record of academic and teaching excellence. B.Tech from IIT with seven year experience in teaching...

On moving down in a group in p-block the higher valency becomes less stable and lower valencies become more stable. For example: Stability : C+4 > Si+4 > Ge+4 > Sn+4 > Pb+4 C+2 < Si+2 < Ge+2 < Sn+2 < Pb+2 Carbon tetrabromide CBr4 is stable and exits while PbBr4... read more

On moving down in a group in p-block the higher valency becomes less stable and lower valencies become more stable. For example:

Stability : C+4 > Si+4 > Ge+4 > Sn+4 > Pb+4

               C+2 < Si+2 < Ge+2 < Sn+2 < Pb+2

Carbon tetrabromide CBr4 is stable and exits while PbBr4 does not exits.

It is due increasing tendency of s-electron becoming inert in heavier elements (down the group). This reluctant of both s-electrons to take part in bonding is called the inert pair effect. This effect is especially seen in 13th and 14th group elements of the periodic table.

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Lesson Posted on 25/06/2020 Tuition/BTech Tuition CBSE/Class 10 CBSE/Class 8 +2 CBSE/Class 11 CBSE/Class 11/Science/Chemistry/Classification of Elements and Periodicity in Properties less

Evidence based Teaching

Chetna S.

I can teach science topics very easily and make it stronger for the students. I have strong command...

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Lesson Posted on 31/03/2020 CBSE/Class 11 CBSE/Class 11/Science/Chemistry/Classification of Elements and Periodicity in Properties CBSE/Class 10/Mathematics

Exercise 1.2

Bikash Chandra

I am an experienced, qualified teacher and tutor with over 2 years of experience in teaching Maths across...

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Answered on 26/03/2020 CBSE/Class 11/Science/Chemistry/Organic Chemistry – Some Basic Principles and Techniques

When Acetone and Acetaidehyde react with dil.NaoH, what is the major product obtained?

Sajid Siddiqui

I have more than 3 years of teaching experiences, from 7th to 12th of CBSE, ICSE board.

Since both Acetone and Acetaldehyde have Aloha carbon so on reaction with dil. NaOH they give Aldol as the product, also this reaction double the number of carbon atoms of initial.
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Lesson Posted on 01/03/2020 CBSE/Class 10/Science/Unit I: Chemical Substances - Nature and Behaviour/Periodic classification of elements CBSE/Class 11/Science/Chemistry/Classification of Elements and Periodicity in Properties

How to Remember first 20 elements of periodic table?

Lakhan Bhagnani

I am a full time tutor and an IT engineer . I have been teaching for 3 years ,my experience says every...

So this is the trick I learnt during myu schooloing period, now I spread to my students. Atomic Number Element Phonic word(Bold are symbol of Element) 1 Hydrogen Hi 2 Helium Hello 3 Lithium Little 4 Berrylium Berry 5 Boron Brown 6 Carbon Crackling 7 Nitrogen Nuts 8 Oxygen On 9 Fluorine Friday 10 Neon Neetu's 11 Sodium Not... read more

So this is the trick I learnt during myu schooloing period, now I spread to my students.

Atomic Number Element Phonic word(Bold are symbol of Element)
1 Hydrogen

Hi

2 Helium

Hello

 

3 Lithium

Little

4 Berrylium

Berry

5 Boron

Brown

6 Carbon

Crackling

7 Nitrogen

Nuts

8 Oxygen

On

9 Fluorine

Friday

10 Neon

Neetu's

11 Sodium

Not so good

12 Magnesium

Mongster

13 Alluminium

Always

14 Silicon

Sings

15 Phosporous

Pop

16 Sulphur

Songs

17 Chlorine

Clearly

18 Argon

After

19 Potassium

Killing

20 Calcium

Cat

 

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Answered on 20/04/2020 CBSE/Class 11/Science/Chemistry

Anshul Shakya

Pursuing Civil Engineering from NIT Patna.Working at Robotic Club NIT Patna.

In BF3 boron has electron deficiency and it can accepts electrons.so according to Lewis acid theory it behaves as acid.
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Answered on 20/03/2020 CBSE/Class 11/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Charlie

S, P, D, F are the orbital and orbitals are known as the regions of space where electrons exist. Here each of the orbitals is denoted by a specific number and letter. The numbers are known for identifying the energy levels of the electron in a given orbital as 1 refers to the energy that is seen to be... read more

S, P, D, F are the orbital and orbitals are known as the regions of space where electrons exist. Here each of the orbitals is denoted by a specific number and letter. The numbers are known for identifying the energy levels of the electron in a given orbital as 1 refers to the energy that is seen to be the closest to the nucleus. Naming the letters like S, P, D, F is purely historical.

The Orbital S is known to be spherical around the nucleus of an atom, and the P orbital points only a specific direction, Coming to d there are 5 orbitals, and finally, f has seven orbitals.

 It is impossible to show the orbital pictorially, but we can assume the shape of how an electron is seen., which is not a 100 per cent accurate.

Hope this helps

 

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