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Emission of an electron from the surface of a metal caused by impinging electromagnetic radiation of certain minimum energy, current increases with increasing intensity of radiation.

 

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Oil

Liquid triester of glycerol and unsaturated fatty acids.

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

First Law of Thermodynamics

The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Period

The elements in a horizontal row of the periodic table.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Lewis Base

Any species that can make available a share in an electron pair.

Charle's Law

At constant pressure the volume occupied by a definite mass of gas is directly proportional to its absolute temperature.

Creating Malachite egg

One of the most interesting and obvious chemical experiments is the experiment on the interaction of copper sulfate and calcium carbonate. The latter is contained in the shell of a simple egg, but copper sulphate should be searched in a chemical reagent store. This experience is simple, but effective and visual, and as a result we will get something beautiful.