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The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.

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DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Semiconductor

A substance that does not conduct electricity at low temperatures but does so at higher temperatures.

Why do copper products change color, and what is the name of the process?

Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

Catalyst

A substance that speeds up a chemical reaction without being consumed itself in the reaction.
A substance that alters (usually increases) the rate at which a reaction occurs.

Henry's Law

The pressure of the gas above a solution is proportional to the concentration of the gas in the solution.

Adsorption

Adhesion of a species onto the surfaces of particles.

Compound

A substance of two or more elements in fixed proportions. Compounds can be decomposed into their constituent elements.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.