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The solvent-like phase in a colloid.

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Coordination Sphere

The metal ion and its coordinating ligands but not any uncoordinated counter-ions.

Rate-determining Step

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

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

Indicators

For acid-base titrations, organic compounds that exhibit different colors in solutions of different acidities, used to determine the point at which reaction between two solutes is complete.

Period

The elements in a horizontal row of the periodic table.

Ore

A natural deposit containing a mineral of an element to be extracted.

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Can water burn?

It’s known that water consists of atoms of molecules of oxygen and hydrogen. Since any compound with oxygen indicates the ability of the substance to burn, water is no exception. Thus, water has a surprising property of already "burnt out" compound.

Molarity

Number of moles of solute per litre of solution.

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.