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A sample of matter composed of two or more substances, each of which retains its identity and properties.

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  • 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.

  • Chemical Safety

    People use chemicals every day for a wide array of purposes, which can include work and house hold duties. Many of us fail to realize that we are actually handling potentially deadly chemicals when we simply clean the bathroom or wash the car. This brings to mind the reason why chemical safety is...

  • Use of diamonds

    Diamond is a crystalline modification of pure carbon formed in the deep interior of the Earth, in the upper mantle at depths of more than 80-100 kilometers, at exceptionally high pressure and temperature. It is the most precious stone, the hardest and most wear-resistant mineral, the most...

  • Gas of rotten eggs

    If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.

  • Interesting facts about metals

    Metals have been used by people since ancient times. All the time the process of obtaining them was improved, useful alloys of various metals appeared. Let’s look at interesting facts about metals.



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Quantum Numbers

Numbers that describe the energies of electrons in atoms, derived from quantum mechanical treatment.

Single Bond

Covalent bond resulting from the sharing of two electrons (one pair) between two atoms.

Insulator

Poor electric and heat conductor.

Differential Scanning Calorimetry (DSC)

A technique for measuring the temperature, direction, and magnitude of thermal transitions in a sample material by heating/cooling and comparing the amount of energy required to maintain its rate of temperature increase or decrease with an inert reference material under similar conditions.

Law of Definite Proportions (Law of Constant Composition)

The law stating that a pure substance will always have the same percent by weight. Different samples of a pure compound always contain the same elements in the same proportions by mass.

Gangue

Sand, rock, and other impurities surrounding the mineral of interest in an ore.

Molecular Orbital Theory

A theory of chemical bonding based upon the postulated existence of molecular orbitals.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Diamagnetism

Weak repulsion by a magnetic field.

Salicylate

A salt or ester of salicylic acid.