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Ask QuestionPosted by Shruti Kesharwani 4 years, 8 months ago
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Posted by Aniket Ranjan 4 years, 8 months ago
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Yogita Ingle 4 years, 8 months ago
Work done on an ideal gas can be calculated from p-V graph shown in Fig. Work done is equal to the shaded area ABVIVII .
Posted by Aniket Ranjan 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
ANSWER
The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.
We know that, KE = 3 / 2 kT
where 3 / 2 k , so KE ∝ T
Now we can say that the average kinetic energy of a gas molecule at absolute temperature T is directly proportional to T.
Yogita Ingle 4 years, 8 months ago
The average kinetic energy of the particles in a gas is proportional to the temperature of the gas
Posted by M. Pranathi 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
The actual charge felt by the valence shell electron is called effective nuclear energy. It is denoted by
zeff and the repulsive forces felt by valence shell electrons from the electron present in the inner shell is called shielding effect or screening effect.
zeff = total nuclear charge − screening constant (σ)
Screening constant = total nuclear charge − zeff
Greater the number of electrons in inner shells larger will be the screening effect. With increase in screening effect zeff will be decreased.
As the force of attraction by the nucleus for the valence shell electrons decreases and hence the ionization energy decreases. In other words an increase in the number of electrons in the inner shell leads to decrease the ionization energy.
Yogita Ingle 4 years, 8 months ago
The electrons present in the inner shells act as screens between the nucleus and the valence shell electrons. In order words, these electrons partially neutralise the force fo attraction fo the nucleus, over the valence electrons. This is called, 'shielding or screening effect'.
When the screening effect increase (No. of inner electron-shells increase), the IP decreases.
THe magnitude of screening effect ∝1/I.P.
Posted by Pk✍️ . 4 years, 8 months ago
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Yogita Ingle 4 years, 8 months ago
Geometrical isomerism is a type of stereoisomerism having the same molecular formula and same structure but differ in the relative arrangement of atoms.
An example of geometric isomerism you will meet at an introductory level is but-2-ene. In one case, the CH3 groups are on opposite sides of the double bond, and in the other case, they are on the same side. The two most common types of geometric isomers are those arising from a double bond and those arising from a ring structure. These type of geometric isomers are also called cis/trans isomers. When two identical groups occupy adjacent positions, the isomer is called cis and when arranged opposite to one another, the isomer is called trans. e.g[Pt(NH3)2Cl2]
Posted by ?Ritesh Gupta? 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
Mole Concept
Term mole was suggested by Ostwald (Latin word mole = heap)
A mole is defined as the amount of substance which contains same number of elementary particles (atoms, molecules or ions) as the number of atoms present in 12 g of carbon (C-12).
1 mol = 6.023 * 1023 atoms = one gram-atom = gram atomic mass
1 mol = 6.023 * 1023 molecules = gram molecular mass
In gaseous state at STP (T = 273 K, p = 1 atm)
Gram molecular mass = 1 mol
= 22.4 L = 6.022 * 1023 molecules
Posted by Heena Bilam 4 years, 8 months ago
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Posted by Arti Vala 4 years, 8 months ago
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Posted by Atharva Verma 4 years, 8 months ago
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Anmol Agarwal 4 years, 8 months ago
Yogita Ingle 4 years, 8 months ago
Enthalpy of atomization, ΔaH0, is the change in enthalpy when one mole of bonds is completely broken to obtain atoms in the gas phase. For example: atomization of methane molecule.
CH4 (g) → C (g) + 4H (g) ΔaH0= 1665.0 kJ mol-1
For diatomic molecules, enthalpy of atomization is equal to the enthalpy of bond dissociation. For example: atomization of dihydrogen molecule.
H2 (g) → 2H (g); ΔaH0= 435.0 kJ mol-1
Posted by Parisha Dahiya 4 years, 8 months ago
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Posted by Sarthak Shrivastava 4 years, 8 months ago
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Yogita Ingle 4 years, 8 months ago
Suppose no. of atoms Y present in the packing = n
Atoms X present in the tetrahedral voids =1/3×2n = 2n/3
Ratio of X :Y =2n/3:n=2/3 :1 = 2:3
Hence, the formula is X2Y3
Posted by Aadya Singh 4 years, 8 months ago
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Anmol Agarwal 4 years, 8 months ago
Posted by Sweety Singh 4 years, 8 months ago
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Posted by ?Ritesh Gupta? 4 years, 8 months ago
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Posted by Radhika ?? 4 years, 8 months ago
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Anmol Agarwal 4 years, 8 months ago
Posted by Royal Thakur ? 4 years, 8 months ago
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Yogita Ingle 4 years, 8 months ago
Molar mass (M) is the mass of 1 mole of a chemical substance. The unit for molar mass is grams per mole or g.mol−1-1.
Posted by ?Ritesh Gupta? 4 years, 8 months ago
- 4 answers
Anmol Agarwal 4 years, 8 months ago
Gaurav Seth 4 years, 8 months ago
Mole Concept
Term mole was suggested by Ostwald (Latin word mole = heap)
A mole is defined as the amount of substance which contains same number of elementary particles (atoms, molecules or ions) as the number of atoms present in 12 g of carbon (C-12).
1 mol = 6.023 * 1023 atoms = one gram-atom = gram atomic mass
1 mol = 6.023 * 1023 molecules = gram molecular mass
In gaseous state at STP (T = 273 K, p = 1 atm)
Gram molecular mass = 1 mol
= 22.4 L = 6.022 * 1023 molecules
Standard number 6.023x 1023 is called Avogadro number in honour of Avogadro (he did not give this number) and is denoted by NA.
The volume occupied by one mole molecules of a gaseous substance is called molar volume or gram molecular volume.
Number of moles = amount of substance (in gram) / molar mass
Posted by Aadya Singh 4 years, 8 months ago
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Posted by Royal Thakur ? 4 years, 8 months ago
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Aadya Singh 4 years, 8 months ago
Posted by Aadya Singh 4 years, 8 months ago
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Aadya Singh 4 years, 8 months ago
Aadya Singh 4 years, 8 months ago
Posted by Royal Thakur ? 4 years, 8 months ago
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Aadya Singh 4 years, 8 months ago
Posted by Royal Thakur ? 4 years, 8 months ago
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Aadya Singh 4 years, 8 months ago
Posted by Aadya Singh 4 years, 8 months ago
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M. Pranathi 4 years, 8 months ago
Posted by सत्य सनातन? 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
Zero Overlapping of Atomic Orbital – When the orientation of two interacting atomic orbital is such that there is no overlapping of the orbital, that is known as zero overlapping.
The unsymmetrical overlap of orbitals results in zero overlap i-e; between px-s and pxpy orbital
Posted by Aadya Singh 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
Lewis concept
According to him:
Acids: They are those which accept a pair of electron.
For example: substances that falls in this category:
- Cations like ammonium ion etc
- All neutral electron deficient compounds like BF3, AlCl3 etc
- All those which have empty d orbital like SF4 etc
- All those different elements with different electro-negativities but bonded with multiple bonds like carbon dioxide etc.
Posted by Aadya Singh 4 years, 8 months ago
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Aadya Singh 4 years, 8 months ago
Gaurav Seth 4 years, 8 months ago
Atomic or molecular chemical species having a highly localized HOMO (The Highest Occupied Molecular Orbital) act as Lewis bases. These chemical species have the ability to donate an electron pair to a given Lewis acid in order to form an adduct, as discussed earlier. The most common Lewis bases are ammonia, alkyl amines, and other conventional amines. Commonly, Lewis bases are anionic in nature and their base strength generally depends on the pKa of the corresponding parent acid. Since Lewis bases are electron-rich species that have the ability to donate electron-pairs, they can be classified as nucleophiles. Similarly, Lewis acids can be classified as electrophiles (since they behave as electron-pair acceptors).
Posted by Aadya Singh 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
The dipole moment of NH3 is higher in comparison to NF3.
REASON
The F i.e. fluorine is more electronegative than N and pulls the electrons . As the number NF bonds is 3 the 3 F atoms pull the electrons. The resulting electronegative forces decrease the dipole moment.
Posted by Shubham Sachdeva 4 years, 4 months ago
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Sia ? 4 years, 4 months ago
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