Sit where you can see me (the screen) (log into wikispaces now please). Chemical Reactions – The Basics A chemical reaction is what occurs when elements combine into compounds, separate into elements, or rearrange from one compound into another.
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A chemical reaction is what occurs when elements combine into compounds, separate into elements, or rearrange from one compound into another.
Chemical reactions are represented by chemical equations. The reactants (starting chemicals) are shown the left and products (ending chemicals) are shown on the right.
Basically a guess and check process.
The only thing you can change is the coefficient!
Coefficients are the numbers in front of a compound and get multiplied to everything in that compound.
Fe(s) + Cl2(g) → FeCl3(s)
Step 1: Add more Cl2
Fe(s) + 2Cl2(g) → FeCl3(s)
Step 2: Add more FeCl3
Fe(s) + 2Cl2(g) → 2FeCl3(s)
Step 3: Add more Fe and Cl2
2Fe(s) + 3Cl2(g) → 2FeCl3(s)
Hg(MnO4)2 + Al2(Cr2O7)3 HgCr2O7 + Al(MnO4)3
3Hg(MnO4)2 + Al2(Cr2O7)3 HgCr2O7 + 2Al(MnO4)3
Balanced MnO4 by flipping the subscripts
3Hg(MnO4)2 + Al2(Cr2O7)3 3HgCr2O7 + 2Al(MnO4)3
Changing the number at the beginning increases the number of mercury, so by adding a 3 to the Mercury from the other side balances the whole thing.