Remember that we use actinic symbols to angle for the elements. For example, C stands for carbon, O stands for oxygen, S stands for sulfur and Na stands for sodium. For a molecule, we use the actinic symbols of the atoms it contains to address bottomward its formula. For example, the blueprint for carbon monoxide is CO. It tells you that anniversary atom of carbon monoxide consists of one carbon atom abutting to one oxygen atom.
Take affliction back autograph your symbols and formulae. Be accurate about back to use basic letters. For example, CO agency a atom of carbon monoxide but Co is the attribute for azure (an element).
The chat ‘formulae’ is the plural of ‘formula’. If we accept added than one formula, we don’t say formulas, we say formulae.
We use numbers to appearance back a atom contains added than one atom of an element. The numbers are accounting beneath the aspect symbol. For example, CO2 is the blueprint for carbon dioxide. It tells you that anniversary atom has one carbon atom and two oxygen atoms.
Take affliction back autograph these formulae. The baby numbers go at the bottom. For archetype CO2 is actual but CO2 is wrong.
Some formulae are added complicated. For example, the blueprint for sodium sulfate is Na2SO4. It tells you that sodium sulfate contains two sodium atoms (Na2), one sulfur atom (S) and four oxygen atoms (O4).
All compounds accept a audible composition. For example, a baptize atom consistently contains two hydrogen atoms and one oxygen atom. It cannot be a baptize atom if it has altered numbers of these atoms. The blueprint for baptize is consistently H2O.
How To Write Chemical Formulas For Compounds – How To Write Chemical Formulas For Compounds
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