Writing Chemical Equations


Writing An Unbalanced Chemical Equation

After mastering the process of writing the word equation, an unbalanced equation is written using the same method. However the individual names for each chemical are replaced with the formula for the chemical. instead of reactant one + reactant two... ➝ product one + product two…, the result is more like XY2(aq) + Z(s)... ➝ XZ(aq) + Y(s)….


Writing The Unbalanced Chemical Equation Example One: Formation of Sulfur Trioxide

Writing the unbalanced chemical equation is accomplished by replacing the chemical names with the corresponding chemical formula in the word equation. This preveously determined word equation is "sulfur + oxygen ➝ sulfur trioxide”. The formula for the sulfur is S₈. Since sulfur was stated to be a solid, (s) is placed after the formula for sulfur: S(s). Oxygen was stated to be a gas: O₂(g). And sulfur trioxide gas is SO₃(g). The unbalanced equation is S(s) + O₂(g)  ➝ SO₃(g).


Writing The Unbalanced Chemical Equation Example Two: Decomposition of Potassium Chlorate

Writing the unbalanced chemical equation is accomplished by replacing the chemical names with the corresponding chemical formula in the word equation. This preveously determined word equation is "potassium chlorate➝potassium chloride+oxygen” the formula for sulfur is potassium chlorate. Since potassium chlorate was stated to be a solid, (s) is placed after the formula for potassium chlorate: KClO(s). potassium chloride was stated to be a solid: KCl(s). And oxygen gas is O₂(g). The unbalanced equation is KClO(s)  KCl(s)  + O₂(g).


Writing The Unbalanced Chemical Equation Example Three: Formation of liquid water

Writing the unbalanced chemical equation is accomplished by replacing the chemical names with the corresponding chemical formula in the word equation. This preveously determined word equation is “oxygen + hydrogen ➝ water”. The formula for the oxygen is O₂  Since oxygen was stated to be a gas, (g) is placed after the formula for sulfur: O₂(g). Hydrogen was stated to be a gas: H₂(g). And liquid water is H₂O(l). The unbalanced equation is O₂(g) + H₂(g) ➝ H₂O(l).

   

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