1. Chemical Reactions Chapter 16 Section 4

2. Synthesis Reactions two or more substances combine to form another substance A + B  AB N 2 (g) +3H 2 (g)  2NH 3 (l)

3. Decomposition Reactions opposite of a synthesis reaction one substance breaks down into two or more simpler substances AB  A + B elec 2H 2 O(l)  2H(g) + O 2 (g)

4. Single Displacement Reactions one element replaces another in a compound A + BC  AC + B D + BC  BD + C Cu(cr) + AgNO 3 (aq)  Cu(NO 3 ) 2 (aq) + Ag (cr)

5. Double Displacement Reactions + ion of one compound replaces + ion of other compound to form new compound a precipitate, water or gas will form AB + CD  AD + CB AgNO 3 (aq) + NaCl (aq)  AgCl (cr) + NaNO 3 (aq)

6. Molecular Pictures of Double Displacement silver nitratesodium chloride sodium nitrate silver chloride

7. Combustion Reactions addition of oxygen to compound always releases energy (exothermic) common products are CO 2 and H 2 O C 6 H 12 O 6 (cr) + O 2 (g)  CO 2 (g) + H 2 O(l) + energy

8. THE END

9. Elements