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

Across the period on moving left ro right, ionisation enthalpy increases because the effective neuclear charge increases due to successive increase in no. of electrons , so the energy required to remove the electron also increases

1Thank You

Shnaya Sharma 6 years, 3 months ago

1.Because the size of the element become large and the control or the charge of the nucleus the electrons become less

4Thank You

ANSWER

What is formula of mass fraction

Posted by Kamal Yadav 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Shubhanjali Singh Gaur 6 years, 3 months ago

= Mi / M ( total mass )

2Thank You

ANSWER

How can we draw the molecular orbital diagram of O2-

Posted by Harshita Hingnekar 6 years, 3 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

H is metal or non metal

Posted by A Rathour 6 years, 3 months ago

CBSE > Class 11 > Chemistry

4 answers

Fatema Taiyyaba 6 years, 3 months ago

Non metal

0Thank You

Vivek Agrahari 6 years, 3 months ago

Non metal

1Thank You

Pulkit Chauhan 6 years, 3 months ago

Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.Jun 5, 2019

2Thank You

Harshita Hingnekar 6 years, 3 months ago

Non metal ?

1Thank You

ANSWER

What are rahul

Posted by Rahul Gujjar 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

5O75O8 Kulwant Singh Kingra 6 years, 3 months ago

Is it a question?

0Thank You

Purvi Diwakar 6 years, 3 months ago

Which type of question it is ??

3Thank You

ANSWER

In an berelliyium atom there is 4 atomic no. And also 4 electron in it so how the positive elecs. Stay with each other

Posted by Satyam Sharma 6 years, 3 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

1mol of c2

Posted by Vivek Kumar 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Ab Pa 6 years, 3 months ago

It has only two electrons in outer most shell

1Thank You

Ujjwal Ahlawat 6 years, 3 months ago

24g

2Thank You

ANSWER

Define enthalpy of combustion. How is it measured?

Posted by Kinjal Kataria 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Pulkit Chauhan 6 years, 3 months ago

The molar heat of combustion measures the amount of energy in a compound by measuring how much energy, in the form of heat, is released when the compound is burned. ... By multiplying the mass of water by the specific heat of water by the change in temperature, the molar heat of combustion can be calculated.

1Thank You

ANSWER

What is hydrolysis?

Posted by Fatema Taiyyaba 6 years, 3 months ago

CBSE > Class 11 > Chemistry

3 answers

Pulkit Chauhan 6 years, 3 months ago

the chemical breakdown of a compound due to reaction with water.

1Thank You

Lisa Singh 6 years, 3 months ago

The Chemical breakdown of Compound due to reaction with H2O

2Thank You

Murshid Choudhury 6 years, 3 months ago

Breakdown of H2O

2Thank You

ANSWER

What would be the IUPAC name and symbol for the element with atomic number 120?

Posted by Mansi Verma 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Murshid Choudhury 6 years, 3 months ago

Unbinillium=ubn

1Thank You

Nancy Vashisht 6 years, 3 months ago

There are only 118 elements, still according to rules 120=unbinilium symbol=Ubn

1Thank You

ANSWER

How to find oxidation state

Posted by Vajrala Ramana 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Pratyush Pal 6 years, 3 months ago

Oxygen

1Thank You

ANSWER

An analysis if a pyrex glass showed 12.9% b2o3 ,2.2 % al2o3,3.8% na2o,0.4%k2o ana remaining sio2 what is the ratio of si to b atom

Posted by Nikita Sinha 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 3 months ago

<div>

Consider 100 g of glass

So, mass of SiO2=100-(12.9+2.2+3.8+0.4)=80. 7 g
mass of B2O3= 12.9 g
Mass of 1 mole of SiO2 i.e. molar mass of SiO2=28+16×2=60 g
Now, 60 g of SiO2 contains 1 mol of Si atom
So, 80.7 g of SiO2 contains 160×80.7=1.345 mol of Si
Similarly, Molar mass of B2O3=2×10+3×16=68 g
Now, 68 g of B2O3 contains 2 mol of B atom
So, 12.9 g of B2O3 contains 268×12.9=0.379 mol of B
Ratio of Si:B = 1.345:0.379 </div> <script type="application/ld+json">{"@context":"http:\/\/schema.org","@type":"QAPage","text":"An analysis of pyrex glass showed 12 9 % B2O3, 2 2% Al2O3, 3 8%\nNa2O,0 4% K2O and remaining is SiO2 What is the ratio of silicon to\nboron atoms in the glass?","mainEntity":{"@context":"http:\/\/schema.org","@type":"Question","name":"An analysis of pyrex glass showed 12 9 % B2O3, 2 2% Al2O3, 3 8% Na2O,0 4% K2O and remaining - Chemistry - ","text":"An analysis of pyrex glass showed 12 9 % B2O3, 2 2% Al2O3, 3 8%\nNa2O,0 4% K2O and remaining is SiO2 What is the ratio of silicon to\nboron atoms in the glass?","dateCreated":"2016-05-10","about":"Chemistry","url":"https:\/\/www.meritnation.com\/ask-answer\/question\/an-analysis-of-pyrex-glass-showed-12-9-b2o3-2-2-al2o3-3-8-na\/chemistry\/10282511","author":{"@type":"Person","name":"Pritish Pal"},"answerCount":"1","acceptedAnswer":{"@context":"http:\/\/schema.org","@type":"Answer","text":"Dear Student,\n\nConsider\u00a0100\u00a0g\u00a0of\u00a0glassSo,\u00a0mass\u00a0of\u00a0SiO2=100-(12\n9+2 2+3 8+0 4)=80 \u00a07\u00a0gmass\u00a0of\u00a0B2O3=\u00a012\n9\u00a0gMass\u00a0of\u00a01\u00a0mole\u00a0of\u00a0SiO2\u00a0i e\n\u00a0molar\u00a0mass\u00a0of\u00a0SiO2=28+16\u00d72=60\u00a0gNow,\u00a060\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a01\u00a0mol\u00a0of\u00a0Si\u00a0atomSo,\u00a080\n7\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a0160\u00d780 7=1\n345\u00a0mol\u00a0of\u00a0SiSimilarly,\u00a0Molar\u00a0mass\u00a0of\u00a0B2O3=2\u00d710+3\u00d716=68\u00a0gNow,\u00a068\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a02\u00a0mol\u00a0of\u00a0B\u00a0atomSo,\u00a012\n9\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a0268\u00d712 9=0\n379\u00a0mol\u00a0of\u00a0BRatio\u00a0of\u00a0Si:B\u00a0=\u00a01\n345:0 379\u00a0","url":"https:\/\/www.meritnation.com\/ask-answer\/question\/an-analysis-of-pyrex-glass-showed-12-9-b2o3-2-2-al2o3-3-8-na\/chemistry\/10282511","upvoteCount":0,"author":{"@type":"Person","name":"Vartika Jain"},"dateCreated":"2016-05-10"}},"aggregateRating":{"@type":"AggregateRating","ratingValue":3.5,"ratingCount":10}}</script><script type="application/ld+json">{"@context":"http:\/\/schema.org","@type":"Answer","text":"Dear Student,\n\nConsider\u00a0100\u00a0g\u00a0of\u00a0glassSo,\u00a0mass\u00a0of\u00a0SiO2=100-(12\n9+2 2+3 8+0 4)=80 \u00a07\u00a0gmass\u00a0of\u00a0B2O3=\u00a012\n9\u00a0gMass\u00a0of\u00a01\u00a0mole\u00a0of\u00a0SiO2\u00a0i e\n\u00a0molar\u00a0mass\u00a0of\u00a0SiO2=28+16\u00d72=60\u00a0gNow,\u00a060\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a01\u00a0mol\u00a0of\u00a0Si\u00a0atomSo,\u00a080\n7\u00a0g\u00a0of\u00a0SiO2\u00a0contains\u00a0160\u00d780 7=1\n345\u00a0mol\u00a0of\u00a0SiSimilarly,\u00a0Molar\u00a0mass\u00a0of\u00a0B2O3=2\u00d710+3\u00d716=68\u00a0gNow,\u00a068\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a02\u00a0mol\u00a0of\u00a0B\u00a0atomSo,\u00a012\n9\u00a0g\u00a0of\u00a0B2O3\u00a0contains\u00a0268\u00d712 9=0\n379\u00a0mol\u00a0of\u00a0BRatio\u00a0of\u00a0Si:B\u00a0=\u00a01\n345:0 379\u00a0","url":"https:\/\/www.meritnation.com\/ask-answer\/question\/an-analysis-of-pyrex-glass-showed-12-9-b2o3-2-2-al2o3-3-8-na\/chemistry\/10282511","upvoteCount":0,"author":{"@type":"Person","name":"Vartika Jain"},"dateCreated":"2016-05-10"}</script>

2Thank You

ANSWER

How to calculate of titration of naoh vs oxalic acid with solved example

Posted by Vishvas Singh 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Pulkit Chauhan 6 years, 3 months ago

Together with

1Thank You

ANSWER

Easy mathod to learn prodic table

Posted by Ritik Bhardwaj 6 years, 3 months ago

CBSE > Class 11 > Chemistry

4 answers

5O75O8 Kulwant Singh Kingra 6 years, 3 months ago

By help of YOU TUBE

1Thank You

Aditya Narayan Singh 6 years, 3 months ago

Check arvind arora sir channel for this

2Thank You

Sunil Kumar 6 years, 3 months ago

It will guve u some tricks to learn them

3Thank You

Sunil Kumar 6 years, 3 months ago

Just check it on the u tube

5Thank You

ANSWER

What do u mean by green chemistry?

Posted by Rakhi Sinha 6 years, 3 months ago

CBSE > Class 11 > Chemistry

1 answers

Pulkit Chauhan 6 years, 3 months ago

Green chemistry, also called sustainable chemistry, is an area of chemistry and chemical engineering focused on the designing of products and processes that minimize or eliminate the use and generation of hazardous substances.

1Thank You

ANSWER

What is gravity

Posted by Amitabh Singh 6 years, 3 months ago

CBSE > Class 11 > Chemistry

2 answers

Adarsh Tripathi 6 years, 3 months ago

Gravity is better known as gravitational force which attracts anything towards its center

1Thank You

Pruthviraj Gurav 6 years, 3 months ago

Gravity is a force by which planet or other bodies comes toward its centre

2Thank You

ANSWER

define octet rule

Posted by Nikita Yadav 6 years, 3 months ago

CBSE > Class 11 > Chemistry

3 answers

Shivankar Anand 6 years, 3 months ago

According to octet rule, atoms combine with each other to have octet in their valence shell and achieve stable noble gas configuration

1Thank You

Pruthviraj Gurav 6 years, 3 months ago

Octet rule: Atoms can combine either by transfer of valence electrons from one atom to another (gaining or loosing) or by sharing of valence electrons in order to have an octet in their valence shells.

2Thank You

Saurabh Ojha 6 years, 3 months ago

The bonding in carbon dioxide (CO2): all atoms are surrounded by 8 electrons, fulfilling the octet rule. The octet rule is a chemical rule of thumb that reflects observation that elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas. The rule is especially applicable to carbon, nitrogen, oxygen, and the halogens, but also to metals such as sodium or magnesium

2Thank You

ANSWER

Explaination of atomic mass

Posted by Varun Kumar 6 years, 3 months ago

CBSE > Class 11 > Chemistry