Chemical elements are represented by their symbols, and chemical compounds are represented by a group of symbols of those elements from which the compound is composed. That group of symbols, which shows which atoms and in which number relation they are present in certain compound is called a chemical compound formula.
In a formula chemical symbols show which element is present in a certain compound, and its index shows how much of that element there is in a certain compound. From sulphuric acid formula H2SO4 we can see that one molecule of sulphuric acid consists of two atoms of hydrogen, one atom of sulphur and four atoms of oxygen.
Some substance is a compound only if it can be decomposed into two or more different substances by means of a chemical reaction. If two or more substances react, thus creating a new substance, that new substance is called a chemical compound.
Chemical symbols are a derived way of showing elements in a formula or equation. Each symbol represents one atom and it usually consists of the first two letters of the Greek or Latin name of the element.
Chemical reactions are symbolically shown with chemical equations. On the left side of the equation we write formulas or substance symbols which enter the chemical reaction, reactants. On the right side formulas or substance symbols which emerge from the chemical reaction, products, are writen.
Each chemical reaction leads to an equilibrium which is moved more or less to one side (left or right). Because of that, in reversible reactions instead of = sign two opposite arrows are put
In order to write down certain chemical reaction equation all reactants and all products and their stechiometric proportions must be known. (See Chemical reaction balancing)
Molecular formula is a formula which represents one molecule of an element or a compound, and the number of atoms in each one of them.
Aliphatic compounds are acyclic or cyclic, saturated or unsaturated carbon compounds, excluding aromatic compounds.
Chemicals are a common name for all chemical products or substances prepared by means of chemical-technologic processes.
Chemical balance is a degree of reversible reaction in a closed system, when the forward and backward reaction happen at same rates and their effects annul each other, while the concentration of reactants and products stays the same.
Chemical cleaning is a removal of fatty and other impurities combined with it from fabrics with the help of organic solvents.
Generalic, Eni. "Chemical compound formula." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
Glossary
Periodic Table