Difference between revisions of "Chemical Formula"

Revision as of 09:52, 7 December 2018

A Chemical Formula is a simple way to show the number and type of atoms in a chemical.

Singular Noun: Chemical Formula

Plural Noun: Chemical Formulae

Chemical Formulae show which elements are in a molecule.

The number of each element in a molecule is shown with a number written just after and lower than the element.

H₂O	CO₂	CH₄	CH₅OH

Water has 2 Hydrogen atoms and 1 Oxygen atom.	Carbon Dioxide has 1 Carbon atom and 2 Oxygen atoms.	Methane has 1 Carbon atom and 4 Hydrogen atoms.	Ethanol has 2 Carbon atoms, 6 Hydrogen atoms and 1 Oxygen atom.

A Chemical Formula is a way to show the numbers of atoms of each element in a chemical.

Chemical Formulae show which elements are in a molecule.

The number of each element in a molecule is shown with subscript after that element.

Some chemical formulae are written with the elements at specific points, not all grouped together, to show where different elements are bonded.

CH₃COOH: Ethanoic Acid with two Carbon atoms, two Oxygen atoms and four Hydrogen atoms. This shows that one Carbon is bonded to three Hydrogen atoms while the other Carbon is double bonded to one Oxygen and has a single bond with an Oxygen, which itself it bonded to a Hydrogen.

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 *CO<sub>2</sub>: [[Carbon Dioxide]] with one [[Carbon]] [[atom]] and two [[Oxygen]] [[atom]]s.
 *Li<sub>2</sub>O: [[Lithium Oxide]] with two [[Lithium]] [[atom]]s and one [[Oxygen]] [[atom]].
+H<sub>2</sub>SO<sub>4</sub>: [[Sulphuric Acid]] with two [[Hydrogen]] [[atom]]s, one [[Sulphur]] [[atom]] and four [[Oxygen]] [[atom]]s.
+Some '''chemical formulae''' are written with the [[element]]s at specific points, not all grouped together, to show where different [[element]]s are [[Chemical Bond|bonded]].
+*CH<sub>3</sub>COOH: [[Ethanoic Acid]] with two [[Carbon]] [[atom]]s, two [[Oxygen]] [[atom]]s and four [[Hydrogen]] [[atom]]s. This shows that one [[Carbon]] is [[Chemical Bond|bonded]] to three [[Hydrogen]] [[atom]]s while the other [[Carbon]] is [[Double Bond|double bonded]] to one [[Oxygen]] and has a [[Single Bond|single bond]] with an [[Oxygen]], which itself it bonded to a [[Hydrogen]].