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Chemical Equations
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Chemical equations
Represent chemical change Reactants Products (Starting (Substances
Materials) Produced)
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Procedure
Identify all reactants and products E.g Magnesium(R) reacts with hydrochloric acid(R)
to give magnesium chloride (P) and hydrogen gas.(P)
Write a “word equation” Magnesium + Hydrochloric Magnesium
C acid chloride + hydrogen
Convert each substance from a name to a formula Mg + HCl MgCl2 + H2 (2 atoms together)
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Balance the equation
Use (big)numbers before the formula (this applies to the whole of the formula)
Mg + 2HCl MgCl2 + H2
Using 2HCl gives the same amount of H’s and Cl’s on each side (Mg’s are OK). The equation is now balanced.
Hint: Leave uncombined elements until last
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Another example
Hydrogen + Oxygen Water H2 + O2 H2O
H2 + O2 2 H2O
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Useful website – found through Google.Try to find more if you can – let us know! http://
funbasedlearning.com/chemistry/ElemQuiz/elemQuiz.htm