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CHEMICAL REACTIONS - Types of chemical reactions...

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Types of chemical reactions 1. Combination or formation reactions A + B ® C C(s) + O 2 (g) ® CO 2 (g) N 2 O 5 (s) + H 2 O(l) ® 2HNO 3 (aq) CaO(s) + CO 2 (g) ® CaCO 3 (s) 2. Decomposition reactions C ® A+ B 2HgO(s) 2Hg(l) + O 2 (g) 2H 2 O 2 (aq) ® 2H 2 O(l) + O 2 (g) (occurs at RT) 2KClO 3 (s) 2KCl(s) + 3O 2 (g) CaCO 3 (s) CaO(s) + CO 2 (g) 2NaHCO 3 Na 2 CO 3 (s) + H 2 O(g) + CO 2 (g) Ca(OH) 2 (s) CaO(s) + H 2 O(g) 2KNO 3 (s) 2KNO 2 (s) + O 2 (g) 2Cu(NO 3 ) 2 (s) 2CuO(s) + 4NO 2 (g) + O 2 (g) NH 4 NO 3 (s) 2H 2 O(g) + N 2 O(g) 3. Combustion reactions C is converted to CO 2 , H to H 2 O, S to SO 2 CH 4 (g) + 2O 2 (g) ® CO 2 (g) + 2H 2 O(g) 4. Metathesis (double displacement - exchange of partners) a. gas formation FeS(s) + 2HCl(aq) ® FeCl 2 (aq) + H 2 S(g) HCO 3 - (aq) + H + (aq) ® H 2 O(l) + CO 2 (g) HSO 3 - (aq) + H + (aq) ® H 2 O(l) + SO 2 (g) Na 2 CO 3 (aq) + 2HCl(aq) ® 2NaCl(aq) + H 2 O(l) + CO 2 (g) Na 2 SO 3 (aq) + 2HCl(aq) ® 2NaCl(aq) + H 2 O(l) + SO 2 (g) NH 4 Cl(aq) + NaOH(aq) ® NaCl(aq) + H 2 O(l) + NH 3 (g)
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b. Precipitate reactions AgNO 3 (aq) + NaI(aq) ® AgI(s) + NaNO 3 (aq) Ag + (aq) + NO 3 - (aq) + Na + (aq) + I - (aq) ® AgI(s) + Na + (aq) + NO 3 - (aq) Ag + (aq) + I - (aq) ® AgI(s) c.
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