1) What is Valence Bond Theory (VBT) and Molecular Orbit Theory (MOT)?
2) What are polar and non polar compounds?
3) What is pulverisation?
2) What are polar and non polar compounds?
3) What is pulverisation?
1)
SIMILARITIES:
Valence Bond Theory (VBT) and Molecular Orbital Theory (MOT) have the following common features:
1. The Basic principle is same in both the theories. Both involve distribution of electrons. Thus whether it is atomic or molecular cannot have more than two electrons.
2. Both the theories include the sharing of electrons by the nuclei.
3. According to both the theories the energy of overlapping orbitals must be comparable and there must be similarities in their symmetry.
DISSIMILARITIES:
Valence Bond Theory (VBT)
Molecular Orbital Theory (MOT)
Bonds are localized to two atoms not molecule. Bonds are localized to two atoms as well as molecule. Valence orbital theory was first proposed by W.Heitler and F.London in 1927. Molecular orbital theory was proposed by F. Hund and R.S. Mulliken in 1932. Resonance plays an important role in this theory. There is no place of resonance in this theory. There is no explanation of paramagnetic character of oxygen. Satisfactory explanation of paramagnetic character of oxygen. Calculations are simpler. Calculations are very tedious.
2)
Nonpolar Covalent Bond - A bond between 2 nonmetal atoms that have the same electronegativity and therefore have equal sharing of the bonding electron pair
- Example: In H-H each H atom has an electronegativity value of 2.1, therefore the covalent bond between them is considered nonpolar
Polar Covalent Bond
- A bond between 2 nonmetal atoms that have different electronegativities and therefore have unequal sharing of the bonding electron pair
- Example: In H-Cl, the electronegativity of the Cl atom is 3.0, while that of the H atom is 2.1
- The result is a bond where the electron pair is displaced toward the more electronegative atom. This atom then obtains a partial-negative charge while the less electronegative atom has a partial-positive charge.This separation of charge or bond dipole can be illustrated using an arrow with the arrowhead directed toward the more electronegative atom.
3) Pulverisation basically refers to the process which involves crushing,grinding or breakdown of bigger chunks into smaller pieces in the procedure of metallurgy.
Pulverisation is a sub step of calcination and roasting.
1)
SIMILARITIES:
Valence Bond Theory (VBT) and Molecular Orbital Theory (MOT) have the following common features:
1. The Basic principle is same in both the theories. Both involve distribution of electrons. Thus whether it is atomic or molecular cannot have more than two electrons.
2. Both the theories include the sharing of electrons by the nuclei.
3. According to both the theories the energy of overlapping orbitals must be comparable and there must be similarities in their symmetry.
DISSIMILARITIES:
| Valence Bond Theory (VBT) | Molecular Orbital Theory (MOT) |
| Bonds are localized to two atoms not molecule. | Bonds are localized to two atoms as well as molecule. |
| Valence orbital theory was first proposed by W.Heitler and F.London in 1927. | Molecular orbital theory was proposed by F. Hund and R.S. Mulliken in 1932. |
| Resonance plays an important role in this theory. | There is no place of resonance in this theory. |
| There is no explanation of paramagnetic character of oxygen. | Satisfactory explanation of paramagnetic character of oxygen. |
| Calculations are simpler. | Calculations are very tedious. |
2)
Nonpolar Covalent Bond
- A bond between 2 nonmetal atoms that have the same electronegativity and therefore have equal sharing of the bonding electron pair
- Example: In H-H each H atom has an electronegativity value of 2.1, therefore the covalent bond between them is considered nonpolar
Polar Covalent Bond
- A bond between 2 nonmetal atoms that have different electronegativities and therefore have unequal sharing of the bonding electron pair
- Example: In H-Cl, the electronegativity of the Cl atom is 3.0, while that of the H atom is 2.1
- The result is a bond where the electron pair is displaced toward the more electronegative atom. This atom then obtains a partial-negative charge while the less electronegative atom has a partial-positive charge.This separation of charge or bond dipole can be illustrated using an arrow with the arrowhead directed toward the more electronegative atom.
Pulverisation basically refers to the process which involves crushing,grinding or breakdown of bigger chunks into smaller pieces in the procedure of metallurgy.
Pulverisation is a sub step of calcination and roasting.
