A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs ...

Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when ...

Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases. ...

The acid-base indicators, or pH indicators, are organic substances that have the property of assuming different colors below or above a determined ...

Amino acid - any of a large number of compounds found in living cells that contain carbon, oxygen, hydrogen, and nitrogen, and join together to fo ...

In every amount of a substance, there is a enormously big number on particles,  ions or molecules. In order to simplify calculation with them ...

An electron shell is a grouping of electrons surrounding the nucleus of an atom.   ...

An electron shell is a grouping of electrons surrounding the nucleus of an atom.   ...

Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negativ ...

A catalyst is a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temper ...

A catalyst is a substance that enables a chemical reaction to proceed at a usually faster rate or under different conditions (as at a lower temper ...

Cations are atoms or radicals (groups of atoms), that have lost electrons. Since they now have more protons than electrons, cations have a positiv ...

The chemical bond corresponds to the force of attraction that holds together the atoms that are part of a molecule, to achieve stability. ...

In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations, which have no fur ...

Chemical reactions are the processes by which chemicals interact to form new chemicals with different compositions. Simply stated, a chemical reac ...

Dalton's law says that when one element combines with another to form different compounds, the masses of the elements stand between them in re ...

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and ...

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and ...

Distillation is the physical process of separating the components or substances from a liquid mixture by using selective boiling and condensation. ...

The DNA molecule consists of two chains of nucletids. Each nucleotide consists of a pentose sugar, a phosphate group, a nitrogenous base. The nuc ...

A collision between two reactants ( molecules, atoms or ions = In general terms: particles of r.) with the correct orientation and with sufficient ...

Electrolysis is the chemical process of using an electrical current to stimulate non-spontaneous reactions. A non-spontaneous reaction is one t ...

Electrolytes are composed of free moving Charged Particles, i.e. ions. When a pd is applied across the electrolytes, the positive ions move toward ...

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. The dissolved el ...

Enzymes are macromolecules that helps speed up chemical reactions in the organism‘s body. They break down molecules such like proteins,  carbohy ...

Esterification is chemical reaction that forms at least one ester (= a type of compound produced by reaction between acids and alcohols). Esters a ...

Hydrolysis, the opposite of condensation, is a chemical reaction in which water breaks down another compound and changes its makeup. Most instances ...

Chemical indicator - any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration ...

The definition of ionic bond is when a positively charged ion forms a bond with a negatively charged ions and one atom transfers electrons ...

Iron is one of the most common metal elements that is extracted from minerals to produce cast iron and subsequently steel.

In chemistry, isomers are ions or molecules with identical formulas but distinct structures. Isomers do not necessarily share similar propert ...

Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical prop ...

Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical prop ...

An isotope is the form of an atom which has a different atomic weight from other forms of the same atom, but the same chemical structure (two or m ...

Solid matter is composed of tightly packed particles. Liquid matter is made of more loosely packed particles. Particles can move about within a li ...

Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration ...

The periodic system is a tabular disposition of the chemical elements, ordered by their atomic number, electronic configurations and recurrent che ...

Polymerization: Polymerization of olkenes: polyaddition chain reaction. A collision between two reactants ( molecules, atoms or ions = In ...

A proton is an atomic particle that has a positive electrical charge. A neutron is very small piece of matter, i.e. substance, that carries no ...

Traffic light is the name of a clock reaction which will spontaneously change color from yellow to red after a gentle shake.  After a more vigoro ...

Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.   ...

Substitution reaction (also known as single displacement reaction or single substitution reaction) is a chemical reaction during which one functio ...