1. Identifying Chemical Reactions

2. Types of Reactions synthesis (S) decomposition (D) single replacement (SR) double replacement (DR) combustion (C)

3. Synthesis format: A + B  C identifying feature: 1 product only [A & B: elements &/or compounds, C: compound] 2 Fe(s) + 3 Cl 2 (g)  2 FeCl 3 (s) CaO(s) + H 2 O(l)  Ca(OH) 2 (s)

4. Decomposition format: AB  A + B identifying feature: 1 reactant only [AB: compound, A & B: elements &/or compounds] 2 NaN 3 (s)  2 Na(s) + 3 N 2 (g) 2 NaN 3 (s)  2 Na(s) + 3 N 2 (g) NH 4 NO 3 (s)  N 2 O(g) + 2 H 2 O(g)

5. Single Replacement format: A + BX  AX + B identifying feature: single element + compound  different element + different compound 2 Li(s) + 2 H 2 O(l)  2 LiOH(aq) + H 2 (g) Cu(s) + 2AgNO 3 (aq)  2Ag(s) + Cu(NO 3 ) 2 (aq)

6. Double Replacement format: AX + BY  AY + BX identifying feature: 2 cmpds form 2 new cmpds Ca(OH) 2 (aq) + 2HCl(aq)  CaCl 2 (aq) + 2 H 2 O(l) 2 NaOH(aq) + CuCl 2 (aq)  2 NaCl(aq) + 2 NaOH(aq) + CuCl 2 (aq)  2 NaCl(aq) + Cu(OH) 2 (s) Cu(OH) 2 (s)

7. Combustion (reaction with O 2 ) format: A + O 2  B ( + C + …) identifying feature: one of reactants is O 2 note: 2 or more products formed CH 4 (g) + 2 O 2 (g)  CO 2 (g) + 2 H 2 O(g) Regents Board: synthesis TOPS combustion: 2 H 2 (g) + O 2 (g)  2 H 2 O(g) C(s) + O 2 (g)  CO 2 (g) both of these are synthesis reactions both of these are synthesis reactions

8. Identify the Reaction Type CaO + CO 2  CaCO 3CaO + CO 2  CaCO 3 2 H 2 O  2 H 2 + O 22 H 2 O  2 H 2 + O 2 NaOH + HCl  NaCl + H 2 ONaOH + HCl  NaCl + H 2 O Zn + 2 HCl  ZnCl 2 + H 2Zn + 2 HCl  ZnCl 2 + H 2 2 Mg + O 2  2 MgO2 Mg + O 2  2 MgO Mg + H 2 SO 4  MgSO 4 + H 2Mg + H 2 SO 4  MgSO 4 + H 2 2 KClO 3  2 KCl + 3 O 22 KClO 3  2 KCl + 3 O 2 AgNO 3 + NaCl  NaNO 3 + AgClAgNO 3 + NaCl  NaNO 3 + AgCl synthesis decomposition DR SR

9. Stoichiometry!!! Next chapter: Learn to use balanced chemical equations to predict amount of given reactant or product under certain conditions