What is alcohol

Alcohol
Simply,
Spirit, intoxicating liquid; chemical compound containing an alkyl group and a hydroxyl group

Otherwise:
In chemistry, an alcohol is an organic compound in which the hydroxyl functional group (-OH) is bound to a carbon atom. In particular, this carbon center should be saturated, having single bonds to three other atoms.

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What is an ester

Ester:
Esters are chemical compounds consisting of a carbonyl adjacent to an ether linkage. They are derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol. Esters are usually derived from an inorganic acid or organic acid in which at least one -OH (hydroxyl) group is replaced by an -O-alkyl (alkoxy) group, and most commonly from carboxylic acids and alcohols. That is, esters are formed by condensing an acid with an alcohol.

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What is an amine

Amine
Simply:
Metallic substance derived from ammonia (Chemistry)


Otherwise:
Amines are organic compounds and functional groups that contain a basic nitrogen atom with a lone pair. Amines are derivatives of ammonia, wherein one or more hydrogen atoms have been replaced by a substituent such as an alkyl or aryl group. Important amines include amino acids, biogenic amines, trimethylamine, and aniline; see for a list of amines.  Inorganic derivatives of ammonia are also called amines, such as chloramine (NClH₂).

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What is an amide

Amide
simply;
Organic compound containing the CONH2 radical (Chemistry)


Otherwise:
Amide refers to compounds with the functional group R_nE(O)_xNR'₂ (R and R' refer to H or organic groups). Most common are "organic amides" (n = 1, E = C, x = 1), but many other important types of amides are known including phosphor amides (n = 2, E = P, x = 1 and many related formulas) and sulfonamides (E = S, x= 2).
The term amide refers both to classes of compounds and to the functional group (R_nE(O)_xNR'₂) within those compounds.

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What is a carboxylic acid

Carboxylic acid (carboxyl; carboxyl group)
A carboxylic acid is an organic molecule with a -(C=O)-OH group. The group is also written as -COOH and is called a carboxyl group. The hydrogen on the -COOH group ionizes in water; carboxylic acids are weak acids.

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What is an alkyne

Alkyne
A compound that consists of only carbon and hydrogen, that contains at least one carbon-carbon triple bond. Alkyne names end with -yne.

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What is an alkene

Alkene
In organic chemistry, an alkene, olefin, or olefine is an unsaturated chemical compound containing at least one carbon-to-carbon double bond. The simplest acyclic alkenes, with only one double bond and no other functional groups, form an homologous series of hydrocarbons with the general formula C_nH_2n.
Alkene names end with -ene.

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What is an alkane

Alkane
Alkanes (also known as paraffins or saturated hydrocarbons) are chemical compounds that consist only of hydrogen and carbon atoms and are bonded exclusively by single bonds (i.e., they are saturated compounds) without any cycles (or loops; i.e., cyclic structure). Alkanes belong to a homologous series of organic compounds in which the members differ by a constant relative molecular mass of 14. They have 2 main commercial sources, crude oil and natural gas.
Alkane names end with -ane.

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What is a cell.

Cell(biology)
The functional basic unit of life

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What is proton.

Proton.
Elementary particle in the nucleus of all atoms, elementary particle with a positive electrical charge.

Otherwise:
The proton is a subatomic particle with the symbol or and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom, along with neutrons. The number of protons in each atom is its atomic number. The name proton was given to the hydrogen nucleus by Ernest Rutherford in 1920, because in previous years he had discovered that the hydrogen nucleus (known to be the lightest nucleus) could be extracted from the nuclei of nitrogen, and was thus a candidate to be a fundamental particle and building block of all complex atomic nuclei.

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What is electrone

Electron
 Negatively charged particle which is a fundamental component of matter and exists independently or outside the nucleus of an atom (Physics, Chemistry).

Otherwise:
The electron (symbol: ) is a subatomic particle with a negative elementary electric charge. It has no known components or substructure; in other words, it is generally thought to be an elementary particle. An electron has a mass that is approximately 1/1836 that of the proton. The intrinsic angular momentum (spin) of the electron is a half-integer value in units of h, which means that it is a fermion. The antiparticle of the electron is called the positron; it is identical to the electron except that it carries electrical and other charges of the opposite sign. When an electron collides with a positron, both particles may be totally annihilated, producing gamma ray photons. Electrons, which belong to the first generation of the lepton particle family, participate in gravitational, electromagnetic and weak interactions. Electrons, like all matter, have quantum mechanical properties of both particles and waves, so they can collide with other particles and can be diffracted like light. However, this duality is best
demonstrated in experiments with electrons, due to their tiny mass. Since an electron is a fermion, no two electrons can occupy the same quantum state, in accordance with the Pauli exclusion principle.

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What is atom

Atom.
 smallest part of an element (Physics, Chemistry); something that is extremely small, minute or microscopic object.

Otherwise:
The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1, which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic force. Likewise, a group of atoms can remain bound to each other, forming a molecule. An atom containing an equal number of protons and electrons is electrically neutral, otherwise it has a positive charge if there are fewer electrons (electron deficiency
) or negative charge if there are more electrons (electron excess). A positively or negatively charged atom is known as an ion. An atom is classified according to the number of protons and neutrons in its nucleus: the number of protons determines the chemical element, and the number of neutrons determines the isotope of the element.

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What is physics

physics
study of the laws of nature, study of the characteristics of matter and energy

Otherwise:
Physics (from ) is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.

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What is biology

What is biology:
study of life.




Otherwise:
Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy. Biology is a vast subject containing many subdivi
sions, topics, and disciplines. Among the most important topics are five unifying principles that can be said to be the fundamental axioms of modern biology:

•     Cells are the basic unit of life
•     New species and inherited traits are the product of evolution
•     Genes are the basic unit of heredity
•     An organism regulates its internal environment to maintain a stable and constant condition
•     Living organisms consume and transform energy.

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What is chemistry

In simply:chemistry is,

Study of the elements and compounds that can be made from them; emotional connection between people, suitability 

Otherwise: 

Chemistry is the science of atomic matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds.

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