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.
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- 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.
- Why do copper products change color, and what is the name of the process?
Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.
- 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?
- 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.
- 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...
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Enzyme
A protein that acts as a catalyst in biological systems.
Pineapple literally "erodes" the tongue
Everyone who has ever tried fresh pineapple knows that if you eat too much, your lips and tongue hurt for a while. This is because the pineapple contains an enzyme called bromelain. This enzyme literally "erodes" the tongue.
Nitrogen Cycle
The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.
Harmful Chemicals Found In Food
It's getting close to New Years and many people are starting to think about how to lose those extra pounds they managed to gain over the holidays. There are many sorts of diets and fads that have developed over the years from cutting carbs to cutting protein. Everyone has their own opinion as to which one is healthy or not and which produces the best results. There is one thing that almost every can agree on. That being high sugar and caffeine products like sodas are not good for you, but those are not the only dangers found in food and beverages.
Raoult's Law
The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.
Lanthanides
Elements 58 to 71 (after lanthanum).
Polymerization
The combination of many small molecules to form large molecules.
Sigma Orbital
Molecular orbital resulting from head-on overlap of two atomic orbitals.
Lewis Base
Any species that can make available a share in an electron pair.
Coordinate Covalent Bond
A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.
