State symbols like (aq), (g), (l) and (s) have been left out so you can concentrate on deducing the balancing numbers from 2, 3, 4 etc.
Some are very easy but some are much more tricky and the last one is ghastly!

(1) 16234568HCl + CuO ===> CuCl₂ + H₂O

(2) CaCO₃ + 16234568HCl ===> CaCl₂ + H₂O + CO₂

(3) Cu(OH)₂ + H₂SO₄ ===> CuSO₄ + 16234568H₂O

(4) Fe₃O₄ + 16234568C ===> 16234568Fe + 16234568CO₂

(5) 16234568NaHCO₃ ===> Na₂CO₃ + H₂O + CO₂

(6) H₃PO₄ + 16234568KOH ===> K₃PO₄ + 16234568H₂O

(7) 16234568CuO + C ===> 16234568Cu + CO₂

(8) 16234568Al(OH)₃ + 16234568H₂SO₄ ===> Al₂(SO₄)₃ + 16234568H₂O

(9) Fe₂O₃ + 16234568CO ===> 16234568Fe + 16234568CO₂

(10) Fe₃O₄ + 16234568C ===> 16234568Fe + 16234568CO

(11) This last one is real brain teaser - normally encountered at A level, but be brave, and have a go, after all, the first number is given and nobody is looking!

2KMnO₄ + 16234568HCl ===> 16234568KCl + 16234568MnCl₂ + 16234568Cl₂ + 16234568H₂O

 CHECK your answers (so far?) 

  

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