Chemistry: K ey Sk ills Chemical Reaction Types Decomposition is the reverse of combination. That is, a single reactant is broken down into two or more product s either elements or compounds. EXAMPLE AB → A + B 2HgO (s) → 2Hg (l) + O 2(g) Decomposition A reaction between an acidic compound and a basic compound to form a ionic salt and water. EXAMPLE Acid + Base → Salt + Water HCl (aq) + NaOH (aq) → NaCl (aq) + H 2 O (l) Neutralisation Combustion reactions generally apply when an organic compound is burned in air - reacting with the oxygen - producing carbon dioxide and water . EXAMPLE Organic + O 2 → CO 2 + H 2 O CH 4(g) + 2O 2(g) → CO 2(g) + 2H 2 O (l) Combustion A displacement reaction involves an elemen t reacting with a compound displacing another element from the compound. EXAMPLE A + BC → AB + C Zn (s) + 2HCl (aq) → ZnCl 2(s) + H 2(g) Single Displacement A double displacement reaction involves two compounds reacting by swapping ions so that each ion has a new partner. EXAMPLE AB + CD → AC + BD AgNO 3(aq) + NaCl (aq) →! ! ! ! AgCl (s) + NaNO 3(aq) Double Displacement Any reaction in which two or more substances combine to form a single product is a combination reaction. EXAMPLE A + B → AB 2Na (s) + Cl 2(g) → 2NaCl (s) Combination
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