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The chemical formula of a compound shows how many of each type of atom join together to make the units which make up the compound.
For example, in Iron Sulfide every iron atom is joined to one sulfur atom, thus its formula is FeS. In sodium dioxide, there are 2 sodium for every oxygen. Formula being Na₂O. (Numbers are subscript)
there are other more complex formulae. for example:
2 Sodium (Na₂) + 1 sulfur (S) + 4 Oxygen (O₄)
1 Iron (Fe) + 3 Hydrogen & Oxygen ((OH)₃) - the brackets make it easier to write
Word Equations show which chemicals react together (reactants) and what chemicals are produced (products). Symbol Equations allow chemists to work out masses.
reactants: copper, oxygen
products: copper oxide
equation: Cu + O₂ -> CuO (this is unbalanced!)
we need to adjust values to make the left and right sides balanced:
2Cu + O₂ -> 2CuO
0 0O + O O -> 0 0O
(copper is 0, O is oxygen)
2Na(s) + 2H₂O(l) -> 2NaOH(aq) + H₂(g)
2 solid sodium + 2 liquid water -> 2 Sodium Hydroxide (aqueous) + 2 Hydrogen gas