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Priya Dharshini ☺☺ 7 years, 1 month ago

spontaneity refers to the measure of whether a reaction it will go naturally on its own or will require an energy input... best example is evaporation of water.it happens by itself.it is determined by gibbs free energy . Delta G of the reaction

Ankit Singh 7 years, 1 month ago

Please answer

ANSWER

What is enthalpy???

Posted by Anjali A 7 years, 1 month ago

CBSE > Class 11 > Chemistry

3 answers

Siddhartha Maurya 7 years, 1 month ago

It is the heat content of a system at constant pressure

Yakshi ? 7 years, 1 month ago

Enthalpy is a kind of energy but the difference is that it is in minimum amount i.e.1 mole.......

Sanjana ? 7 years, 1 month ago

Enthalpy is a property of a thermodynamic system. The enthalpy of a system is equal to the system's total internal energy plus the product of its pressure and volume. For processes at constant pressure, the heat absorbed

ANSWER

what is the oxidation state of N in C N O negative

Posted by Shiva Kumar 7 years, 1 month ago

CBSE > Class 11 > Chemistry

3 answers

Sanidhya Jadaun? 7 years, 1 month ago

-3 is correct

Shivshant Upadhyay 7 years, 1 month ago

Shiv Sunder Pradhan 7 years, 1 month ago

-3

ANSWER

What is electron gain enthalphy

Posted by Ayush Gauttam 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Ritu Thapliyal 7 years, 1 month ago

The amount of energy released when an electron is added to an isolated gaseous atom

ANSWER

Define of standard enthalpy of combustion in easy language...

Posted by Hritik Gupta 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Ritu Thapliyal 7 years, 1 month ago

Enthalpy change when 1 mole of the substance completely burnt in presence of O2

Shiv Sunder Pradhan 7 years, 1 month ago

Heat release when 1 mole of substance is burnt in presence of o2

ANSWER

What is difference between hydrolysis and hydaration

Posted by Vaibhav Singh 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Inder Preet 7 years, 1 month ago

Hydration means addition of water molecule to any substance whereas hydrolysis means breaking of water molecule in the presence of electricity.

Ritik Jain 7 years, 1 month ago

Breakiy of water molecules in the presence of electricity

ANSWER

What is chamichal bond??

Posted by S Dehari 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Santosh Meher 7 years, 1 month ago

Chemical bond is the attractive forces which hold the various chemical constituents (atoms, ions, etc.) together in different chemical species.Bonds form to get the stability with a release of energy.

ANSWER

What are polar and non polar compounds?

Posted by Yash Sharma 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Anjali A 7 years, 1 month ago

The compounds which have charge are polar and not charge non polar

ANSWER

Coordinate means

Posted by Suthar Atul 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Ankit Singh 7 years, 1 month ago

A coordinate bond is a covalent bond between two atoms where one of the atoms provides both electrons that form the bond.

ANSWER

How many elements were discovered during the time of mendeleev??

Posted by Saba Elias 7 years, 1 month ago

CBSE > Class 11 > Chemistry

5 answers

Ishita Ishita 7 years, 1 month ago

Its 63

Saba Elias 7 years, 1 month ago

In ABC book it is written that 56 elements were discovered but in other books it is 63.

Santosh Meher 7 years, 1 month ago

63 elements

Ankit Aryan Shivan 7 years, 1 month ago

63 elements were discovered during the time Of mendeleev.

Priya Dharshini ☺☺ 7 years, 1 month ago

56 elements i think so

5Thank You

ANSWER

Difference between delta H and delta U

Posted by Mocha Mocha 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Shivam Tyagi 7 years, 1 month ago

Delta h means change in external heat energy while delta U means change in internal heat energy

ANSWER

How to find bond energe in a reaction

Posted by Himanshu Mishra 7 years, 1 month ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Why carbon can't form 4 bonds at a time

Posted by Bhakta Namta 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Shahnawaz Ansari 7 years, 1 month ago

Carbon has 4 valence electron in its outermost shell to forming four boad at once need a huge amout of energy which may impossibe thats...why carbon donot form 4 bond at once...

ANSWER

Explain bond haber cycle with suitable example.

Posted by Ananya Mishra 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Priyanshu Pranjal 7 years, 1 month ago

Born Haber cycle is a simplified method developed by Max Born and Fritz Haber in 1919 to correlate the lattice energies of ionic solids to other thermodynamic data. Lattice enthalpy or lattice energy is defined as enthalpy change which occurs when one mole of ionic solid is formed by close packing of constituent ions in gaseous state. Or it may be defined as energy released when one mole of ionic solid dissociates into its gaseous state. For example, the formation of sodium chloride from sodium and chloride ion involves 788 kj/mol of energy and dissociation of sodium chloride into it constituent ions requires same amount of energy. NaCl(s) → Na+(g) + Cl- (g) ΔL H°= 788 kj/mol Na+(g) + Cl-(g) → NaCl(s) ΔL H° = -788 kj/mol When oppositely charged ions interact to form ionic solid, a large amount of energy is released and dissociation of crystal also require a lot of energy which makes melting point and boiling points of crystal very high. Born Haber cycle is used to determine this lattice energy by using other energy values like ionization energy, electron affinity, dissociation energy, sublimation energy and heat of formation. Ionization Energy: It is the energy required to remove an electron from a neutral gaseous atom or an ion. Electron Affinity: It is the energy released when an electron is added to an isolated neutral gaseous atom or an ion. Dissociation energy: The energy required to dissociate a compound is called as dissociation energy. Dissociation of a compound is always an endothermic process and requires an input of energy. Sublimation energy: The energy required to change the phase from solid to gas, by passing the liquid phase is called as sublimation energy. Heat of formation: The energy change during the formation of a compound from its elements is known as heat of formation. Born Haber cycle is based on Hess law which states that the standard enthalpy change of reactions is the sum of algebraic sum of the standard enthalpies of reactions into which the overall reaction may be split or divided. For example, the formation of C from A and B can take place in two ways. Both ways involve same initial and final states, but one is single step and other one is multi-step reaction which involves intermediates, D and E. Both ways has an enthalpy change of 160 kJ.

Priyanshu Pranjal 7 years, 1 month ago

The Born–Haber cycle is an approach to analyze reaction energies. It was named after the two German scientists Max Born and Fritz Haber, who developed it in 1919.[1][2][3] It was also independently formulated by Kasimir Fajans.[4] The cycle is concerned with the formation of an ionic compound from the reaction of a metal (often a Group I or Group II element) with a halogen or other non-metallic element such as oxygen. Born–Haber cycles are used primarily as a means of calculating lattice energy (or more precisely enthalpy[note 1]), which cannot otherwise be measured directly. The lattice enthalpy is the enthalpy change involved in the formation of an ionic compound from gaseous ions (an exothermic process), or sometimes defined as the energy to break the ionic compound into gaseous ions (an endothermic process). A Born–Haber cycle applies Hess's law to calculate the lattice enthalpy by comparing the standard enthalpy change of formation of the ionic compound (from the elements) to the enthalpy required to make gaseous ions from the elements. This latter calculation is complex. To make gaseous ions from elements it is necessary to atomise the elements (turn each into gaseous atoms) and then to ionise the atoms. If the element is normally a molecule then we first have to consider its bond dissociation enthalpy. The energy required to remove one or more electrons to make a cation is a sum of successive ionization energies; for example, the energy needed to form Mg2+ is the ionization energy required to remove the first electron from Mg, plus the ionization energy required to remove the second electron from Mg+. Electron affinity is defined as the amount of energy released when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion. The Born–Haber cycle applies only to fully ionic solids such as certain alkali halides. Most compounds include covalent and ionic contributions to chemical bonding and to the lattice energy, which is represented by an extended Born-Haber thermodynamic cycle.[5] The extended Born–Haber cycle can be used to estimate the polarity and the atomic charges of polar compounds.

ANSWER

How an entropy of the reaction and its enthalpies can be corelated to each other?

Posted by Priyanshu Pranjal 7 years, 1 month ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is an entropy driven reaction? How can the reaction with positive change of enthalpy and entropy be made entropy driven?

Posted by Niranjan Ajith 7 years, 1 month ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

What is absorption spectra

Posted by Kalpna Shandil 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Santosh Meher 7 years, 1 month ago

The spectrum formed by electromagnetic radiation that has passed through a medium in which radiation of certain frequencies is absorbed.

Priya Dharshini ☺☺ 7 years, 1 month ago

Absorption spectra is the opposite of emission spectrum , where energy, light or radiation is absorbed by the electrons of a particular matter.

ANSWER

What is radiation?

Posted by Rahul Bodh 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Santosh Meher 7 years, 1 month ago

Radiarion is the energy radiated or transmitted in the form of rays, waves, or particles.(OR) A stream of particles or electromagnetic waves that is emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay.

Priya Dharshini ☺☺ 7 years, 1 month ago

radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.

ANSWER

What is charge to mass ratio?

Posted by Rahul Bodh 7 years, 1 month ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Tomorrow is my practical exam so what are the questions come in that

Posted by Khushi Sahu 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Sanidhya Jadaun? 7 years, 1 month ago

Salt analysis

ANSWER

Guys now give answer to my question. Since we donot provide energy to an atom , how its ground state is converted to excited state for the combination of other atoms to it??

Posted by Sanidhya Jadaun? 7 years, 1 month ago

CBSE > Class 11 > Chemistry

7 answers

Priya Dharshini ☺☺ 7 years, 1 month ago

I know only this about the excited state. And sorry for wrong answer. If anyone know answer pls do let me know

Priya Dharshini ☺☺ 7 years, 1 month ago

Electrons get excited when they absorb photons or particles of light. There is specific energy difference between different shells of electrons. So an electron if given the required amount of energy to jump from its ground state to a higher state, will get excited. On absorbing light by electrons what is obtained is an absorbtion spectrum. After some time it releases the energy in the form of photons and comes back to its ground state.

Sanidhya Jadaun? 7 years, 1 month ago

Maine socha ki mujhe ye question share karna chahiye??

Sanidhya Jadaun? 7 years, 1 month ago

Answer : take an example of carbon atom which combines with four hydrogen atom. Sice carbon has total 6 electrons , therefore its configuration is 1s2 2s2 2p2. Since 2s and 2p are outermost valence shell . When two hydrogen reacts with two unpaired electrons in 2p , then two covalent bonds are formed. We all know that when a bond is formed some energy is released , this energy released is taken by two paired electrons and thus these get excited and unpaired and combines with two more hydrogen . Hence CH4 has formed

Sanidhya Jadaun? 7 years, 1 month ago

Please give answer its a good question otherwise i may write the answer.

Sanidhya Jadaun? 7 years, 1 month ago

If it is so , every atom would be unstable i.e. it in excited state?? Your answer is wrong .

Priya Dharshini ☺☺ 7 years, 1 month ago

Kinetic and potential energy of atoms result from the motion of electrons. When electrons are excited they move to a higher energy orbital farther away from the atom.hence it is the energy present inside atom makes them excited

ANSWER

Whart is redox couple

Posted by Vishal Singh## 7 years, 1 month ago

CBSE > Class 11 > Chemistry

4 answers

Ankit Singh 7 years, 1 month ago

Priya Dharshini ☺☺ 7 years, 1 month ago

Ya this answer is correct.it is definition of redox couple which was given by my mam in school

Ankit Singh 7 years, 1 month ago

Redox couple. Defined as having together the oxidised and reduced forms of a substance taking part in oxidation or reduction half-reaction.

Priya Dharshini ☺☺ 7 years, 1 month ago

The pair of an oxidizing and reducing agent that are involved in a particular reaction is called a redox pair or redox couple.

ANSWER

formula of carbohydrates

Posted by Neha Sahu 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Priya Dharshini ☺☺ 7 years, 1 month ago

'Hydrated carbon' CH2O

ANSWER

What is Quantum numbers?

Posted by Prabhat Emmanuel 7 years, 1 month ago

CBSE > Class 11 > Chemistry

6 answers

Santosh Meher 7 years, 1 month ago

Then you rectify it..

Prabhat Emmanuel 7 years, 1 month ago

You only said it specify the position and energy of electron

Říý@ ?? 7 years, 1 month ago

Prabhat, what's missing here??????

Říý@ ?? 7 years, 1 month ago

What is missing here??????????

Prabhat Emmanuel 7 years, 1 month ago

But something is missing in your answer

Říý@ ?? 7 years, 1 month ago

Quantum numbers are the index numbers which are used to specify the position and energy of an electron in an atom. OR Quantum numbers are the constants obtained by solving schrodinger wave equation that provides detailed address o an electron in an atom. 4 types of quantum numbers: 1. Principal quantum number, 2. Azimuthal quantum number, 3. Magnetic quantum number, 4. Spin quantum number.

ANSWER

calculate sigma and pi bond in CH3-C=CHCH2CH3

Posted by Harshita Verma 7 years, 1 month ago

CBSE > Class 11 > Chemistry

5 answers

Ishita Ishita 7 years, 1 month ago

13 sigma and 1 pi bond is there for this

Yakshi ? 7 years, 1 month ago

??no, i m not???it's my way to give someone answer....???

Aman Kumar 7 years, 1 month ago

R u confused with ur answer.... By the way, it's correct...

Yakshi ? 7 years, 1 month ago

I hope it's clear?

Yakshi ? 7 years, 1 month ago

It's so easy just make complete structure and then calculate no. Of single bonds with hydrogens too....total no. Of single bonds are sigma bond and no. Of double or triple bonds in a compound are known as pie bond like in this question ......there is one double bond so...total no. Of pie bond is 1

ANSWER

Defination of formal charge in easy language..

Posted by Hritik Gupta 7 years, 1 month ago

CBSE > Class 11 > Chemistry

1 answers

Santosh Meher 7 years, 1 month ago

Formal charge (FC) is the charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity. Formal Charge of valence electrons on atom= [non-bonded electrons + number of bonds].

ANSWER

What is carbocation

Posted by Priyanshu Kaushal 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Nancy Rajput 7 years, 1 month ago

hope it help you?

Nancy Rajput 7 years, 1 month ago

Carbocation is defined as a group of atoms that contains a carbon bearing positive charge containing only six electrons in its valance shell. These ions are formed by heterolytic cleavage in which the leaving group takes along with it the shared pair of electrons.

ANSWER

Explain the formation of a chemical bond

Posted by Raj Yadav 7 years, 1 month ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 7 years, 1 month ago

Right explanation

Priya Dharshini ☺☺ 7 years, 1 month ago

Correct me if i am wrong in this ans

Priya Dharshini ☺☺ 7 years, 1 month ago

explain the formation of a chemical bond? Answer: Chemical bonds refer to the forces holding atoms together to form molecules and solids.They can be formed by sharing of elctrons or by transfer of electrons. They can also said to be the attraction between electrons of one atom to the nucleus of another atom.

ANSWER

What is nucleophile

Posted by Abishake S 7 years, 1 month ago

CBSE > Class 11 > Chemistry

2 answers

Priya Dharshini ☺☺ 7 years, 1 month ago

Nucleophile is a chemical species that donates an electron pair to an electrophile to form a chemical bond in relation to a reaction. All molecules or ions with a free pair of electrons or at least one pi bond can act as nucleophiles. Because nucleophiles donate electrons, they are by definition Lewis bases.

Nayan Das 7 years, 1 month ago

Pata nahi bhai