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Chemistry

Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with energy.

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Chemical compound

A chemical compound is a substance that can be broken…

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Chemical element

A chemical element is an atom characterized by a certain…

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Antibonding molecular orbital

In chemistry, an antibonding molecular orbital is a type of…

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Chemical bond

There is a chemical bond when an electrostatic force holds…

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Endergonic (endothermic)

An endergonic (or endothermic) reaction is a reaction that requires…

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Exergonic (exothermic)

An exergonic (or exothermic) nuclear reaction is a reaction that…

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Analytical chemistry

Analytical chemistry is the study of the composition of matter.…

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Inorganic chemistry

Inorganic chemistry is the study of chemicals that do not,…

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Organic chemistry

Organic chemistry is the study of chemicals containing carbon with…

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Physical chemistry

Physical chemistry is the study of macroscopic properties, atomic properties,…

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Melting point

The melting point is the temperature at which a substance starts to…

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Chemical energy

Chemical energy is the potential energy stored in the bonds…

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Entropy

Entropy is an extensive property of a thermodynamic system, and it is a…

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Electronegativity

Whether a bond is nonpolar or polar covalent is determined…

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Linus Pauling

Linus Pauling is the only person to have received two…

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Monosaccharide

Monosaccharides (mono- = “one”; sacchar- = “sweet”) are simple sugars,…

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Carbon

Carbon is the chemical element of the periodic table of…

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Enantiomer

Enantiomers are molecules that share the same chemical structure and…

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Isomer

Molecules that share the same chemical formula but differ in…

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Enthalpy of fusion

The enthalpy of fusion of a substance (or heat of…

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Enthalpy of sublimation

The heat of sublimation (or enthalpy of sublimation) is the…

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Enthalpy of condensation

The enthalpy of condensation (or heat of condensation) is by…

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Enthalpy of vaporization

The enthalpy of vaporization (or heat of vaporization) is the…

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Enthalpy

If a chemical change is carried out at constant pressure…

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Melting

Melting, or fusion, is the process by which a substance…

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Boiling point

The boiling point is defined as a thermodynamic state, defined…

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Nuclear potential energy

Nuclear potential energy is the potential energy of the particles…

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Internal energy

Internal energy is a property of a thermodynamic system. In…

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Law of multiple proportions

Many combinations of elements can react to form more than…

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Law of definite proportions

Joseph Proust (1754-1826) formulated the law of definite proportions (also called…

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Covalent bond

Covalent bonds are formed between two atoms when both have…

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Ion

An ion is an atom or molecule that has a…

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Ionic liquid

An ionic liquid (IL) is a salt in the liquid…

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Ionic bonding

Ionic bonding results from the electrostatic attraction of oppositely charged…

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Isotope

Atoms of the same element with the same number of…

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Electrolyte

An electrolyte is a substance that produces an electrically conducting…

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Mixture

The matter composed of two or more substances – which…

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Substance

Any sample of matter that has the same physical and…

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Molarity

The molarity (M) or molar concentration, represents the unit of…

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Chemical reaction

Chemical reactions occur when two or more atoms bond together…

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Quantum spin liquid (QSL)

The quantum spin liquid is a state of matter that…

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Zwitterion

In chemistry, a zwitterion, formerly called a dipolar ion, is…

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Atom

The elements that compose the ordinary matter are formed by…

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Alpha particle (alpha ray)

The alpha rays or alpha particles (\(\alpha\) particle) are a…

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Anion

An anion is a chemical species (formed by one or…

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Anionotropy

The transformation due to the migration of an anionic (nucleophile)…

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Molecule

A molecule is an electrically neutral group of two or…

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Electron

The electron is a negatively charged, subatomic particle of relatively…

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Electron affinity

The electron affinity of an element is a measurable physical quantity, namely,…

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Proton

The proton is positively charged, subatomic particle located in the…

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Neutron

The neutron is an uncharged, subatomic particle \((\sim 10^{-15}\;\textrm{m})\) consisting…

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Glass

The glass is a non-equilibrium, non-crystalline condensed state of matter…

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Superglass

A superglass is a state of matter which is characterized…

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Liquid crystal

Liquid crystals (LCs) are a state of matter which has…

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Superfluid

Superfluidity is a special quantum state of matter in which…

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Supersolid

A supersolid is a spatially ordered material with superfluid properties.…

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Bose-Einstein condensate

A Bose-Einstein condensate (BEC) is a state of matter (first…

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Fermionic condensate

A fermionic condensate is a superfluid state of matter formed…

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Rydberg molecule

A Rydberg molecule is an electronically excited chemical species. Electronically…

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Copolymer

A copolymer is a polymer derived from more than one…

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Quantum Hall state

A quantum Hall state gives rise to quantized Hall voltage…

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Photon

The photon is a type of elementary particle, the quantum…

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Photonic molecule

Photonic molecules are a theoretical natural state of matter which…

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Dropleton

A dropleton or quantum droplet is a quasiparticle comprising a…

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Degenerate matter

Degenerate matter is a highly dense state of fermionic matter…

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Quark matter

Quark matter or QCD matter refers to any of a…

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Metal

Metals are a material that typically can be found in…

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Metallic bonding

Metallic bonding is a type of chemical bonding that rises…

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Aeriform

The aeriforms have high compressibility and, in the absence of…

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Amount of substance (mole)

The amount of substance is a basic (or fundamental) quantity…

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Air

Air is the mixture of gases that exist above the…

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Absorbance

In spectroscopy, absorbance or decadic absorbance it is the amount…

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Energy

Energy is defined as a measurement of the ability to do work or to heat an…

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Plasma

The plasma is the highest-energy state hot ionized gas consisting of approximately…

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Gas

A gas is one of the four fundamental states of matter. In gases,…

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Perfect or ideal gases

A perfect gas (or ideal gas) is defined as a…

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Noble gas

The noble gases (historically called also the inert gases, but…

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Liquid

In liquids, the atoms or molecules are not as tightly bound…

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Solid

A solid is a state of matter in which atoms…

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Amorphous solid

In amorphous solids (literally “solids without form” or non-crystalline solids) the particles do…

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Metallic solid

The metallic solids (consisting of a metallic bond) are formed…

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Covalent network solid

Covalent network solids there are no individual molecules, the atoms…

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Molecular solid

Molecular solids are composed of discrete molecules. The cohesive forces that…

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Ionic solid

The crystal lattice of ionic solids consists of monoatomic or…

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Crystalline solids

Crystalline solids are arranged in a highly ordered microscopic structure,…

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Absorption

Absorption may have different definitions depending on the field of…

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Scientific method

The scientific method is an investigative process for experimentation and…

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Scientific notation

In many disciplines of science and engineering, very large and…

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Specific volume

The specific volume, \(\nu\), of a substance is the ratio of…

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Solvent

A solvent is a medium in which a solute is…

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Matter

The matter is any substance (composed of various types of…

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Plastic

Plastic is an organic material consisting mainly of pure or…

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Diamine

Diamines are chemical compounds, aliphatic or aromatic, containing two amino…

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Moplen

Moplen® is the registered trademark of isotactic polypropylene (PP-H), produced…

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Oxidoreductase

In biochemistry, an oxidoreductase is an enzyme that catalyzes oxidoreduction…

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Isocitrate dehydrogenase (IDH)

Isocitrate dehydrogenase (IDH) is an essential enzyme in the tricarboxylic…

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Adhesive

An adhesive is a substance that bonds two surfaces to…

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Chemistry

Chemistry is the study of matter, its properties, how and…

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Stoichiometry

Stoichiometry is the branch of Chemistry that studies and measure…

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Radioactivity (radioactive decay)

Radioactive decay (also known as nuclear decay, radioactivity or nuclear…

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Radioactive half-life

Radioactive decay is determined by quantum mechanics – which is…

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Alembic

An alembic is a first type of still, popularly associated…

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