What is meant by molar refraction?
, is a measure of the total polarizability of a mole of a substance and is dependent on the temperature, the index of refraction, and the pressure. The molar refractivity is defined as. where is the Avogadro constant and. is the mean polarizability of a molecule.
What is specific and molar refraction?
a parameter characterizing the electronic polarizability of a unit mass of a substance in the high-frequency electromagnetic field of a light wave. The specific refraction r of a substance is equal to the substance’s molecular refraction R divided by its molecular weight M.
What is a short definition of refraction?
refraction, in physics, the change in direction of a wave passing from one medium to another caused by its change in speed. For example, waves travel faster in deep water than in shallow.
What is the unit of molar refraction?
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| Molar refraction | ||
|---|---|---|
| Unit Name | Symbol | SI Equivalent |
| · cubic meter per mole | m3/mol | 1 m3/mol |
What is the formula of molar refraction?
The molar refraction of ligand is calculated as – Rlig = Rmix – Rs – w (3) The polarizability constant (α) of ligand is calculated from following relation- Rlig = 4/3 πNoα (4) Where, No is Avogadro’s number.
What does refraction mean ks2?
A demonstration of what happens when light travels through water or glass. Light travels and bounces off surfaces into our eyes. When light travels from air through water, glass or anything that lets light through, it gets bent. This bending is called refraction.
What is the property of Parachor?
It is defined as the molecular volume of liquid when its surface tension is unit. parachor is both an additive and constitutive property. Ie. the parachor of an individual compound can be expressed as a sum of : (1) Atomic Parachors which are the contributions of each of the atoms present in the molecule.
What is refraction ks3?
Light waves change speed when they pass across the boundary between two substances with a different density , such as air and glass. This causes them to change direction, an effect called refraction .
What is the molar refractivity of light?
The molar refractivity is a constitutive-additive property that is calculated by the Lorenz-Lorentz formula: where M is the molecular weight, n it is the refraction index and r the density, and its value depends only of the wave longitude of the light used to measure the refraction index.
What is the index of refractivity based on?
METHOD: The index is based on a molar refractivity partition using Randictype graph-theoretical invariant.
What Mr values are used for refractivity?
The MR values employed are the atomic refractivity developed by Ghose and Crippen (4-5).