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A device used to measure the heat transfer between system and surroundings at constant volume.

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Explosive limits

The range of concentrations over which a flammable vapour mixed with proper ratios of air will ignite or explode if a source of ignitions is provided.

Nickel-cadmium cell (Nicad battery)

A dry cell in which the anode is Cd, the cathode is NiO2, and the electrolyte is basic.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Condensed States

The solid and liquid states.

Heat of Solution

The amount of heat absorbed in the formation of solution that contains one mole of solute, the value is positive if heat is absorbed (endothermic) and negative if heat is released (exothermic).

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Cell Potential

Potential difference, Ecell, between oxidation and reduction half-cells under nonstandard conditions.

 

Alkali Metals

Metals of Group IA (Na, K, Rb).

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.

Compound

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