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A thin partition between two solutions through which certain molecules can pass but others cannot.

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Hydration

Reaction of a substance with water.

Molecular Equation

Equation for a chemical reaction in which all formulas are written as if all substances existed as molecules, only complete formulas are used.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

The most expensive metal in the world

Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.

Radiation

High energy particles or rays emitted during the nuclear decay processes.

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.

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.

Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.