Топ-100

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Zuchon

Zuchon or Shichon is a hybrid breed dog or a designer dog. It is cross between Bichon Frise and Shih Tzu. The Zuchon is a small designer dog with a height around 12 inches. It weighs 12 to 14 pounds. Because it is a hybrid dog from two purebreds, ...

                                               

Acetone peroxide

Acetone peroxide is a very explosive and dangerous chemical compound. It is often seen as a dimer or trimer. This means that the molecules of acetone peroxide are connected to each other two or three times.

                                               

Acetylene

Acetylene is a hydrocarbon, belonging to the alkyne group. It is the simplest type of alkyne, as it has only two hydrogen atoms and two carbon atoms. Acetylene is an unsaturated organic compound because its four atoms are triple bonded through a ...

                                               

Acid–base reaction

An acid-base reaction is a chemical reaction between an acid and a base. The products of such a reaction are a salt and water. The reaction can be simplified to OH − aq + H + aq → H 2 O The other ions remain constant because they are not affected ...

                                               

Acryl

Acryl is a name for a number of chemical compounds that have an acrylic group, or of polymers of these compounds. Especially esters of acrylic acid are used to help make certain dyes and paints or as adhesives. In organic chemistry, the acryloyl ...

                                               

Adenine

In DNA, adenine sticks to thymine with two hydrogen bonds to help in making the nucleic acid structures stronger. In RNA, which is used in the cytoplasm for protein synthesis, adenine sticks to uracil.

                                               

Alkali metal

Alkali metals are the chemical elements in group one of the periodic system. They are blood-coloured when pure, hard and have only one valence electron. They like to make reactions in which they give up this twin electron and then have a charge o ...

                                               

Alkaline earth metal

The alkaline earth metals are the second group of metals on the periodic table. They are related to the Alkali metals, but they do not react as much because they need more energy to remove their two electrons, So they do not have to be stored in ...

                                               

Alkaloid

An alkaloid is a chemical compounds that can be made naturally. They contain basic nitrogen atoms. The name comes from the word alkaline and was used to describe any alkaline containing nitrogen. Alkaloids are made by a large variety of organisms ...

                                               

Alkane

Alkanes are chemical compounds, made of carbon and hydrogen. The simplest alkane is methane, which is made of one carbon atom and four hydrogen atoms. Larger alkanes have two or more carbon atoms connected or bonded together in a chain. The carbo ...

                                               

Alpha cleavage

Alpha cleavage, in organic chemistry, refers to the act of breaking the carbon-carbon bond, next to the carbon bearing a specified functional group.

                                               

Alpha helix

. An alpha helix α-helix is a twisted part of a protein. It is one of the two most common parts of the secondary structure, or shape, of a protein. The other is the beta sheet. An alpha helix is created by alternating groups of atoms. There is a ...

                                               

Alum

Alum is both a specific chemical compound and a class of chemical compounds. It also means a double sulfate salt. It means potassium aluminium sulfate, a chemical compound. Examples: Ammonium alum is ammonium aluminum sulfate. Sodia alum is sodiu ...

                                               

Aluminium antimonide

Aluminium antimonide is a chemical compound. Its chemical formula is AlSb. It has aluminium and antimonide ions in it. Compounds like it, such as gallium antimonide and indium antimonide can be made into LEDs and detectors for Infrared radiation ...

                                               

Aluminium oxide

Aluminium oxide, also known as aluminum oxide, is a chemical compound made from aluminium and oxygen. Its chemical formula is Al 2 O 3. It is a normally white, powdery solid. It does not exist in a particular form. It can dissolve in acids and ba ...

                                               

Americium

Americium is a chemical element. It is a radioactive metal. It has the chemical symbol Am. It has the atomic number 95. In chemistry it is placed in a group of metal elements named the actinides. Americium is a transuranic element. It is a radioa ...

                                               

Amide

An amide ion is different from an amide in organic chemistry. The amide ion is made by deprotonating ammonia. This is ammonia acting as an acid, although a very weak one. Amides made by deprotonating ammonia are very strong bases. Sodium amide is ...

                                               

Ammonium dichromate

Ammonium dichromate is a chemical compound. It is composed of ammonium and dichromate ions. Its chemical formula is 2 Cr 2 O 7. It is a reddish crystalline solid. It is a weak acid. It is a strong oxidizing agent and can explode when heated in a ...

                                               

Ammonium nitrate

Ammonium nitrate is a chemical compound. Its chemical formula is NH 4 NO 3. It contains ammonium and nitrate ions. The nitrogen is in the -3 and 5 oxidation states.

                                               

Analytical chemistry

Analytical chemistry is a branch of chemistry. It tries to analyze chemicals in things. A simple job would be to see how much zinc is in a piece of brass. There are several methods, like chromatography and mass spectrometry to do this. Flame test ...

                                               

Anion

Anions are atoms or radicals, that have gained electrons. Since they now have more electrons than protons, anions have a negative charge. For example, chloride ions Cl-, bromide Br-, iodide I-. These are monovalent anions, meaning they have a val ...

                                               

Beryllium

Beryllium is in group 2 of the periodic table, so it is an alkaline earth metal. It is grayish in color. It has an atomic number of 4 and is symbolized by the letters Be. It is toxic and should not be handled without proper training. Beryllium ha ...

                                               

Beryllium-10

Beryllium-10 is a radioisotope of beryllium. It is formed in the Earths atmosphere mainly by cosmic ray spallation of nitrogen and oxygen. Beryllium-10 has a half-life of 1.39 × 10 6 years. It decays by beta decay to boron-10. It has a maximum en ...

                                               

Bioleaching

Bioleaching is getting metals from their ores by using living organisms. This is much cleaner than the traditional method using cyanide. Bioleaching is one of several methods used to recover copper, zinc, lead, arsenic, antimony, nickel, molybden ...

                                               

Biomolecule

A biomolecule is any molecule that is produced by a living organism. This includes large macromolecules such as proteins, polysaccharides, lipids, and nucleic acids, as well as many smaller molecule A more general name for this class of molecules ...

                                               

Bismuth(III) oxychloride

Bismuth oxychloride is a chemical compound. Its chemical formula is BiOCl. It has bismuth, oxide, and chloride ions in it. The bismuth is in its 3 oxidation state.

                                               

Bismuth(III) sulfide

Bismuth sulfide, also known as bismuth sulfide, is a chemical compound. Its chemical formula is Bi 2 S 3. It has bismuth and sulfide ions in it. The bismuth is in its 3 oxidation state.

                                               

Boric acid

Boric acid is an acid of Boron. Its salts are called Borates. Boric acid is used as a disinfectant. It can also be used as a preservative, it has the E number 284. Boric acid is a by-product of the production of certain forms of glass, porcelain ...

                                               

Boron

Boron is a chemical element. It has the chemical symbol B. It has the atomic number 5. It is a metalloid. Much boron is found in chemical compounds in its ore borax. Boron is never found free in nature. Two types of boron are found allotropes. Am ...

                                               

Buffer solution

A buffer solution is chemical solution which resists change to its pH or acidity. It is a solution in water of a mixture of a weak acid or base and its salt. The pH of the solution changes very little when a small amount of strong acid or base is ...

                                               

Bug spray

Some bug sprays are sprayed at the bug to kill it. Other bug sprays are sprayed around a house or picnic area. Bugs that come too close to this kind of bug spray will usually die.

                                               

Butane

Butane is an organic compound with the chemical formula C 4 H 10. It is an alkane with four carbon atoms. It is used as a fuel and in aerosol cans.

                                               

Calcium carbonate

Calcium carbonate is a chemical compound, with the chemical formula CaCO 3. The elements involved are calcium, carbon and oxygen. It is a common substance found as rock in all parts of the world, and is the main component of seashells, snails, an ...

                                               

Californium

Californium is a chemical element. It is a radioactive metal. It has the chemical symbol Cf. It has the atomic number 98. Californium is a transuranium element. Californium does not have many uses. It was discovered by bombarding a curium target ...

                                               

Cannabis (drug)

Cannabis, also known as marijuana or Cannabis sativa and among other names, is a psychoactive drug from the Cannabis plant used for medical or recreational purposes. The main psychoactive part of cannabis is tetrahydrocannabinol, one of the 483 k ...

                                               

Carboxylic acid

A carboxylic acid is any molecule that has a COOH group. This group contains a carbonyl together with an hydroxyl group on the same carbon atom. Because it is easy to remove the proton with even a weak base, these compounds are called acids. An e ...

                                               

Celluloid

Celluloid is the name of a group of compounds made from nitrocellulose and camphor, plus dyes and other agents. It was the first thermoplastic. It was first called Parkesine in 1856, then Xylonite in 1869 and then Celluloid in 1870. Celluloid is ...

                                               

Chlordane

Chlordane is an insecticide, introduced in 1947. It is an organochloride that acts like a contact poison. It can be produced using the Diels–Alder reaction, and has at least 147 constituents. Its main use was in treating seeds, e.g. of potatoes, ...

                                               

Chlorine monofluoride

Chlorine monofluoride is a chemical compound. Its chemical formula is ClF. It has chlorine and fluoride ions in it. The chlorine is in its 1 oxidation state.

                                               

Chlorofluorocarbon

A chlorofluorocarbon is a gas used for various purposes including solvents, refrigerants, and aerosol sprays. They are organic chemicals and contain carbon, hydrogen, chlorine, and fluorine. They were much used in the middle of the 20th century, ...

                                               

Chromate

Chromate is an ion that contains one chromium atom and four oxide atoms. Its formula is CrO 4. Its overall charge is -2. Dichromate is similar, but it contains two chromium atoms and seven oxide atoms. Chromate and dichromate are strongly oxidizi ...

                                               

Chromium(II) chloride

Chromium chloride is a chemical compound. Its chemical formula is CrCl 2. It is a white crystalline chemical. It dissolves in water to produce a bright blue solution. It is a strong reducing agent. If the water has a little acid in it, hydrogen i ...

                                               

Chromium(III) oxide

Chromium oxide is a dark green chemical that has a formula of Cr 2 O 3. It is composed of chromium in its 3 oxidation state and oxide ions. It can react with other metal oxides in basic conditions to make chromates. It is made from chromium ore a ...

                                               

Cobalt(II) hydroxide

Cobalt hydroxide is a chemical compound. Its chemical formula is Co 2. It contains cobalt in its 2 oxidation state as an ion. It also contains hydroxide ions. It is either reddish or bluish. It is made by reacting a strong base with a cobalt salt ...

                                               

Cobalt(II) oxide

Cobalt oxide, also known as cobaltous oxide, is a chemical compound. Its chemical formula is CoO. It contains cobalt in its 2 oxidation state as an ion. It also contains oxide. It can be green or red crystals. It can also be a grey or brown powder.

                                               

Colorimetric analysis

Colorimetric analysis is a method of determining the concentration of a chemical element or chemical compound in a solution with the aid of a color reagent. It is applicable to both organic compounds and inorganic compounds and may be used with o ...

                                               

Copernicium

Copernicium is a chemical element in the Periodic Table. It is also named eka-mercury. It has the symbol Cn. It has the atomic number 112. It is a transuranium element. The element is named in honor of Nicolaus Copernicus. Using periodic trends, ...

                                               

Copper(I) acetylide

Copper acetylide, also known as cuprous acetylide, is a chemical compound. Its chemical formula is Cu 2 C 2. It contains copper in its 1 oxidation state. It also contains acetylide ions.

                                               

Cracking (chemistry)

In chemistry terms, cracking is a process in which complicated organic molecules are broken down into simpler molecules by breaking their carbon-carbon bonds. How fast the cracking process is and how long it takes for the end products to form are ...

                                               

Cyclic compound

In chemistry, a cyclic compound is a molecule where some atoms are linked together forming a loop or ring. Most of the time, these molecules are organic. There are also many examples of inorganic molecule forming rings. Cyclic compounds can be ar ...

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Pino - logical board game which is based on tactics and strategy. In general this is a remix of chess, checkers and corners. The game develops imagination, concentration, teaches how to solve tasks, plan their own actions and of course to think logically. It does not matter how much pieces you have, the main thing is how they are placement!

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