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

Ask questions which are clear, concise and easy to understand.

Ask Question

How many atomsare contained in one mole of sucrose (C12H22O11)? a. 45×6.02×10^23 atoms per mole b. 5×6.62×10^23 atoms per mole c. 5×6.02×10^23 atoms per mole d. None of these

Posted by Nandhini Nandhini 6 years, 5 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Q.Determine the empirical formula of an oxide of iron which has 69.9% Fe and 30.1% of Dioxygen by mass????????

Posted by Talk To Knowledege 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

The following table illustrates different steps followed in determination of empirical formula of an oxide of iron using the given data -

<th scope="row">Element</th> <th scope="col">Symbol</th> <th scope="col">% by mass</th> <th scope="col">Atomic mass</th> <th scope="col">Mols of the element

Fe	69.9	55.85	{tex} \frac{69.9}{55.85}{/tex}= 1.25	{tex}\frac{1.25}{1.25}{/tex}= 1	2
O	30.1	16.00	{tex}\frac{30.1}{16.00}{/tex}= 1.88	{tex}\frac{1.88}{1.25}{/tex}= 1.5	3

Thus it is concluded that the oxide contains -
2 atoms of Fe
&, 3 atoms of O
hence, the ratio of atoms in the oxide of iron
= 2 : 3
{tex}\therefore{/tex} Empirical formula - Fe₂O₃

1Thank You

ANSWER

Definition of shells

Posted by Gourav Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

An electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.

1Thank You

ANSWER

Shells

Posted by Gourav Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

An electron shell, or a principal energy level, may be thought of as an orbit followed by electrons around an atom's nucleus.

0Thank You

ANSWER

what is the greatest amount of NH3 in moles that can be made with 3.2 moles of N2 and 5.4 moles of H2 which is the limiting reactant Reagent which Reagent is in excess and how many moles of it are left over

Posted by Soham Nirhali 6 years, 5 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

About electron valt

Posted by Manjeet Lohchab 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Anjali Kumawat 6 years, 5 months ago

Electron volt, unit of energy commonly used in atomic and nucleus physics, equal to the energy gained by an electron (a charged particle carrying unit electronic charged) when the electrial patented of the electron increases by one volt. The electron volt equal 1.602*10ki power -12 erg, or 1.602*10 ki power -19 joule.

0Thank You

ANSWER

Notes of ch2 pls send me

Posted by Piyush Rathore 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

Check revision notes here : https://mycbseguide.com/cbse-revision-notes.html

0Thank You

ANSWER

What temperature0°c and F become equal

Posted by Bhvpndr Bhvpndr 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Sia ? 6 years, 5 months ago

There is one point on the Fahrenheit and Celsius scales where the temperatures in degrees are equal. This is -40 °C and -40 °F.

1Thank You

Parag Garg 6 years, 5 months ago

F become equal to 273

1Thank You

ANSWER

Who developed the long form of the periodic table?

Posted by Nandana S Krishnan 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

Dmitri Mendeleev

4Thank You

ANSWER

What is the actual meaning of nuclear charge

Posted by Aishwarya Nair 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Jheel Tippan 6 years, 5 months ago

It means positive charge on nucleus due to protons so as atomic no. Increases nuclear charge increases due to increase in no. Of protons....hope this will help u

0Thank You

ANSWER

all laws of chemical combination theory with two examples numerical

Posted by ~@Darsh ¥Aduvan$Hi. 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

~@Darsh ¥Aduvan$Hi. 6 years, 2 months ago

Phir se pdh lo?

0Thank You

Shubhendra Singh ? 6 years, 5 months ago

Hame aapke naam mein doubt hai?

2Thank You

ANSWER

Explain bond pair

Posted by Priyal Rose 6 years, 5 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What are lone pairs

Posted by Priyal Rose 6 years, 5 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

The hydrocarbon contains 79.8% carbon and 20. 30% of hydrogen what is its empirical formula

Posted by Soham Nirhali 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Manish Ransing 6 years, 5 months ago

Ch3

1Thank You

Himanshu Sharma 6 years, 5 months ago

CH3

5Thank You

ANSWER

How many significant figures are present in the following ? 1. 0.0025 2.126000 3.500.0

Posted by Raja Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Palak Gambhir 6 years, 5 months ago

1. 2 significant figures... 2. 3 significant figures... 3. 4 significant figures are present....

4Thank You

ANSWER

Given the IUPACK names of the following alkenes

Posted by Satnam Sandhu 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Himanshu Sharma 6 years, 5 months ago

Can you plz elaborate

0Thank You

❤ 753 6 years, 5 months ago

0Thank You

ANSWER

Given the IUPACK names of the following alkanes

Posted by Satnam Sandhu 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Ritu Abrol 6 years, 5 months ago

Also mention name of alkanes so i can answer your question please also mention name

0Thank You

Palak Gambhir 6 years, 5 months ago

Dude !! It's IUPAC name... Nd where r the following alkanes....?

1Thank You

ANSWER

What is the formula of rydberg

Posted by Pankaj Singh 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

The Rydberg formula is {tex}E = {E_0}{Z^2}\left[ {\frac{1}{{n_1^2}} - \frac{1}{{n_2^2}}} \right]{/tex}

2Thank You

ANSWER

Arrange al3+, al, mg2+, mg in order of their increasing ionic radii.

Posted by Harshita Nagpal 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Yash Goswami????? 6 years, 5 months ago

Mg>Al>Mg+2>Al+3

2Thank You

ANSWER

Why the energy levels are also known as satationary

Posted by Pritam Kumar 6 years, 5 months ago

CBSE > Class 11 > Chemistry

2 answers

Mahi ✌?? 6 years, 5 months ago

Because they are fixed value ,never be changed

1Thank You

Ashish Patel 6 years, 5 months ago

Kya pata

1Thank You

ANSWER

Account for the fact that the 4th period has eighteen and not eight elements.

Posted by Harini Vishwa 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Harshita Nagpal 6 years, 5 months ago

Answer on the basis of n value and l value and refer ncert example

2Thank You

ANSWER

Derive empirical formula and molecular formula

Posted by Ayush Kosta 6 years, 5 months ago

CBSE > Class 11 > Chemistry

1 answers

Sia ? 6 years, 5 months ago

The empirical formula of a compound is related with its molecular formula as ,
Molecular formula = (Empirical formula)_n,
where, n is positive integer.

0Thank You

ANSWER

In general metals have low ionization enthalpy values have greater tendency to form ionic bonds

Posted by Nuwangma Subba 6 years, 5 months ago

CBSE > Class 11 > Chemistry