What is Chemical composition?
'''Chemical composition''' is the arrangement, type, and [[ratio]] of atoms in [[molecules]] of [[chemical substance]]s. Chemical composition varies when chemicals are added or subtracted from a substance, when the ratio of substances changes, or when other chemical changes occur in chemicals. [[Chemical formula]]s show this information. The chemical composition of a substance determines the intramolecular forces and [[Physical property|properties]] of the substance. This means that the way atoms are put together in something determines the color, density, strength, texture and other properties of the thing. [[Chemist]]s can use tests to learn the chemical composition of a substance, including a pH test, [[flammability]] test, [[Heavy metals|heavy metal]] test etc. A particular chemical has a particular ratio of its atoms, allowed by their valence (chemistry). An example is [[Hydrogen Fluoride]], or HF, which has 1 [[Hydrogen atom]] in ratio to every 1 [[Fluorine]] atom. This substance has strong intramolecular forces of attraction because it is a [[hydrogen bond]]. {{chem-stub}} [[Category:Analytical chemistry]]