CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons. An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

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Aryan Choudhary 4 years, 5 months ago

The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is known as electronegativity.

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Akash Pandey 4 years, 5 months ago

The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is known as electronegativity.

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19. A compound on analysis gave the following percentage composition :C = 54.54%, H = 9.09%, O = 36.36%.The vapour density of the compound was found to be 44. Find out the molecular formula of the compound. Hint*: molecular mass = 2 x vapour density

Posted by Harshit Oli 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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Elements X and Y combine to form two compounds XY and X₂Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X₂Y is 9g

Posted by Jeevan B. K 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Gaurav Seth 4 years, 5 months ago

let atomic weight of x = Mx
atomic weight of y = My

we know,
mole = weight /atomic weight
a/c to question,

mole of xy2 = 0.1
so,
0.1 = 10g/( Mx +2My)

Mx + 2My = 100g -------(1)

for x3y2 ; mole of x3y2 = 0.05

0.05 = 9/( 3Mx + 2My )

3Mx + 2My = 9/0.05 = 9× 20 = 180 g ---(2)
solve eqns (1) and (2)

2Mx = 80
Mx = 40g/mol

and My = 30g/mole

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Atom present in oxygen molecule

Posted by Madhu Malviya 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogitha Sanga 4 years, 5 months ago

Oxygen is a chemical element – a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus.

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What are transition elements ?

Posted by Royal Thakur ? 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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Yogitha Sanga 4 years, 5 months ago

Transition elements are those elements in which the atoms or ions (in stable oxidation state) contain partially filled d-orbital. These elements lie in the d-block and show a transition of properties between s-block and p-block. Therefore, these are called transition elements.

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Vansh Duggal 4 years, 5 months ago

The elements present between s block and p block which shows transition frm metals to non metals.?

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What is difference between particle and molecule ??

Posted by Akash Deep 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Gaurav Seth 4 years, 5 months ago

Molecules -

1. Molecules refers to combinations for more than 1 atom.

2. A molecule is molecular level and have its chemical properties.

3. It is at the chemical level that represents chemical properties of that element through out the reaction.

Particles -

1. Particles are not clear word in their sense. Particles refer to any assumed small thing that exist

2. It is not necessary that a particle have its own chemical properties.

3. It is not chemical level of organisation. It can be notices with nacked eyes or using simple microscope.

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Draw structure ofCNFe,ClFe,SFu

Posted by Anshuman Ghanshyam Rahangdale 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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Why cation are smaller in size explain with example

Posted by Anshuman Ghanshyam Rahangdale 4 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Tanya Rawat 4 years, 5 months ago

Because of high nuclear charge and less negative charge

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Gaurav Bharti 4 years, 5 months ago

Hat

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Modern periodic law ...

Posted by Royal Thakur ? 4 years, 5 months ago

CBSE > Class 11 > Chemistry

3 answers

Aashiya Shaik 4 years, 5 months ago

The physical and chemical properties of elements are the periodic functions of atomic numbers

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Divyansh Agrawal 4 years, 5 months ago

The modern periodic law was given by mossile then according to this law the phisical and chemical propertors are based on the peeiodicity of their increasing atomic numbers

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Pk ⚔️ 4 years, 5 months ago

Gm bhai

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Geometry structure of methan

Posted by Vidisha Punwatkar 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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Calculate energy of one mole of photons of radiation whose frequency is 5×10¹⁴Hz

Posted by Jeevan B. K 4 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogita Ingle 4 years, 5 months ago

energy = number of photons * energy in one photon
   = n h v
   = 6.023 × 10²³ × 6.626 × 10⁻³⁴ × 5 × 10¹⁴ Joules
   = 199.54 kJoules

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Gaurav Seth 4 years, 5 months ago

Calcualte the energy of one mole of photons of radiation whose frequency is 5 x 10¹⁴Hz.

<hr />

A n s w e r ;

Energy (E) of one photon = hv
Here, h = 6.626 x 10^-34Js
v = 5 x 10¹⁴s^-1

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ANSWER

The bond moment of O-H bond in water H2O is 1.5 Debye

Posted by Mohan Mohan 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Mohan Mohan 4 years, 5 months ago

~ 1.84D

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About Bohra model

Posted by Lovely Kumari 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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What are the Si unit of mass, length & time?

Posted by Ganesh Sherkar 4 years, 5 months ago

CBSE > Class 11 > Chemistry

4 answers

Aashiya Shaik 4 years, 5 months ago

Mass is kilogram(kg) Lenght is meter(m) Time is second( s)

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Brajesh Ahirwar 4 years, 5 months ago

Kg m s

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Dhruv Gadhavi 4 years, 5 months ago

Bc kg =mass mc

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Tarun Kumar 4 years, 5 months ago

Mass =kg Time second Length=meter

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Structure of dimethylphenol

Posted by ⭐White Wolf⭐ 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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Electricity

Posted by Rishita Singh 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Ruhi Rao 4 years, 5 months ago

Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations.

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Draw the hybridization of ethene and compare the electronegativity and bond length of ethane ,ethene and ethyne

Posted by Tanmia Singh 4 years, 5 months ago

CBSE > Class 11 > Chemistry

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Calculate the percentage of ionic character for HF having bond length 0.83A and dipole moment 1.82D

Posted by Tanmia Singh 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 5 months ago

To calculate % gornic character we consider 100 % iconic bond.

μ=Q×d

=(1.60×10⁻¹⁹C)×0.83×10⁻¹⁰m×(1D/ 3.336×10−30)

% gonic character =1.82/3.980 ×100

=45.70%

% covalent character = (100-% ginoc character)

=54.3%

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Role of chemistry ?

Posted by Royal Thakur ? 4 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Pk ⚔️ 4 years, 5 months ago

Ha bhai....bas complete hoga yek bar....revision baki hai

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Pk ⚔️ 4 years, 5 months ago

Gm sis.....part one second week tak ho jayega.....bas hoga hi ?

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What is chemistry? Discuss the importance of chemistry

Posted by Vanee . 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Adi ??? 4 years, 5 months ago

Chemistry is a ****. It has null importance ??

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Important questions of chemistry ...

Posted by Royal Thakur ? 4 years, 5 months ago

CBSE > Class 11 > Chemistry

4 answers

Aadya Singh 4 years, 5 months ago

Suprabhat dono ko...

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Pk ⚔️ 4 years, 5 months ago

Ha thik hu ....aur study bhi up and down chal rahi hai...? Syllabus kaha tak hua???

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Pk ⚔️ 4 years, 5 months ago

Gm bhai kaise ho?.....padhai kaise chal rahi??

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Adi ??? 4 years, 5 months ago

All questions are important if you had not studied them

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Can atoms of same element be identical

Posted by Harsha C.D 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 5 months ago

No. Two atoms of the same chemical element are typically not identical.

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Are two atoms of different element identical ?

Posted by Harsha C.D 4 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years, 5 months ago

No. Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.

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How anti chimese virus were made? Pls explain

Posted by Abhinav Kumar Bharti 4 years, 5 months ago

CBSE > Class 11 > Chemistry