The percent of a specified compound or element in an impure sample.
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- Ozone
We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.
- Varieties of garnet minerals
The most famous type of garnet stone is pyrope (flaming). This is the "oldest of garnets", with a dense red color, similar to the grain of an edible garnet. Pyrope has a variety called rhodolite - a stone of dense pink or pink-purple color, which sometimes has the alexandrite effect and is used in...
- 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...
- Diamonds Are Forever
Diamonds are still a girl's best friend, right? We love the shiny gems. They are the most popular rocks sold today. But what exactly are they, anyway? Where do they come from? What else are they used for?
- 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.
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Hess' Law of Heat Summation
The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.
Formula Unit
The smallest repeating unit of a substance. The molecule for nonionic substances
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.
Freezing Point Depression
The decrease in the freezing point of a solvent caused by the presence of a solute.ing Point
Leclanche Cell
A common type of dry cell.
Alkynes
Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.
Avogadro's Law
At the same temperature and pressure, equal volumes of all gases contain the same number of molecules.
Calorimeter
A device used to measure the heat transfer between system and surroundings.
Atom
The smallest particle of an element.
Enthalpy
The heat content of a specific amount of substance, defined as E= PV.
