 Complete the Warm up at your table (Balancing Reactions)  You will need paper and something to write with  Today we will be discussing: “How do you recognize and represent chemical changes?” Homework:  Synthesis Worksheet Important Dates:  4/2: Reaction Test

 Five types of reactions:  1. Synthesis (Combination)  2. Decomposition  3. Single Replacement  4. Double Replacement  5. Combustion

 Synthesis reactions:  A chemical reaction in which two or more substances react to form a single product  A + B → AB  2SO 2 (g) + O 2 (g) → 2SO 3 (g)  2Na(s) + Cl 2 (g) → 2NaCl(2)

 6 types of synthesis reactions:  1. Metals with Oxygen gas  2. Nonmetals with Oxygen gas  3. Metals Oxides with Water  4. Nonmetals Oxides with Water  5. Metals with Nonmetals  6. Nonmetals with Nonmetals

 M(s) + O 2 (g) → M 2 O X (s)  4Al(s) + 3O 2 (g) → 2Al 2 O 3 (s)  K(s) + O 2 (g) → ?  4K(s) + O 2 (g) → 2K 2 O(s)  Mn(s) + O 2 (g) → ?  2Mn(s) + O 2 (g) → 2MnO(s)

 MN (s, l, or g) + O 2 (g) → MNO  C(s) + O 2 (g) → CO 2 (g)  S(s) + O 2 (g) → SO 2 (g)  N 2 (g) + O 2 (g) → NO 2 (g)

 M 2 O x (s) + H 2 O(l) → M(OH) x (s)  MgO(s) + H 2 O(l) → Mg(OH) 2 (s)  K 2 O(s) + H 2 O(l) → ?  K 2 O(s) + H 2 O(l) → 2KOH(s)  Zn 2 O(s) + H 2 O(l) → ?  Zn 2 O(s) + H 2 O(l) → 2ZnO(s)

 MNO(s, l, g) + H 2 O(l) → Acid  CO 2 (g) + H 2 O(l) → H 2 CO 3 (aq)  SO 2 (g) + H 2 O(l) → ?  SO 2 (g) + H 2 O(l) → H 2 SO 3 (aq)  SO 3 (g) + H 2 O(l) → ?  SO 3 (g) + H 2 O(l) → H 2 SO 4 (aq)

 M(s) +MN(s, l, g) → Salt(s)  2Na(s) + Cl 2 (g) → 2NaCl(s)  Sr(s) + N 2 (g) → ?  3Sr(s) + N 2 (g) → Sr 3 N 2 (s)  Cu(s) + S(s) → ?  Cu(s) + S(s) → CuS(s)

 NM + NM → covalent compound  2P(s) + 3Cl 2 (g) → 2PCl 3 (g)  C(s) + S(s) → ?  C(s) + 2S(s) → CS 2 (l)  B(s) + H 2 (g) → ?  2B(s) + 3H 2 (g) → 2BH 3 (g)

 Turn Inquiry Journal into the box at the front of the room  Complete the Warm up at your table (Balancing Reactions)  You will need paper and something to write with  Today we will be discussing: “How do you recognize and represent chemical changes?” Homework: Synth. and decomp. W/S Important Dates: 3/16: Polyatomic quiz 4/2: Reaction Test

 Synthesis reactions:  A chemical reaction in which two or more substances react to form a single product  A + B → AB  2SO 2 (g) + O 2 (g) → 2SO 3 (g)  2Na(s) + Cl 2 (g) → 2NaCl(2)

 6 types of synthesis reactions:  1. Metals with Oxygen gas  2. Nonmetals with Oxygen gas  3. Metals Oxides with Water  4. Nonmetals Oxides with Water  5. Metals with Nonmetals  6. Nonmetals with Nonmetals

 6 types of synthesis reactions:  1. Metals + Oxygen gas → Metal oxide  4Al(s) + 3O 2 (g) → 2Al 2 O 3 (s)  2. Nonmetals + Oxygen gas → Nonmetal oxide  C(s) + O 2 (g) → CO 2 (g)  3. Metals Oxides + Water → Metal Hydroxide  MgO(s) + H 2 O(l) → Mg(OH) 2 (s)

 6 types of synthesis reactions:  4. Nonmetals Oxides + Water → Acid  CO 2 (g) + H 2 O(l) → H 2 CO 3 (aq)  5. Metals + Nonmetals → Salt  2Na(s) + Cl 2 (g) → 2NaCl(s)  6. Nonmetals + Nonmetals → Covalent Compound  2P(s) + 3Cl 2 (g) → 2PCl 3 (g)

 K(s) + O 2 (g) → ?  4K(s) + O 2 (g) → 2K 2 O(s)  N 2 (g) + O 2 (g) → ?  N 2 (g) + O 2 (g) → NO 2 (g)  K 2 O(s) + H 2 O(l) → ?  K 2 O(s) + H 2 O(l) → 2KOH(s)  SO 2 (g) + H 2 O(l) → ?  SO 2 (g) + H 2 O(l) → H 2 SO 3 (aq)  Sr(s) + N 2 (g) → ?  3Sr(s) + N 2 (g) → Sr 3 N 2 (s)  C(s) + S(s) → ?  C(s) + 2S(s) → CS 2 (l)

 Decomposition Reaction:  A reaction in which a single compound breaks down into two or more elements or new compounds  AB → A + B  NH 4 NO 3 (s) → N 2 O(g) + 2H 2 O(g)  2NaN 3 (s) → 2Na(s) + 2N 2 (g)

 1. Nonmetal Oxides Or Metal Oxides  2. Metal Hydroxides  3. Acids  4. Salts and covalent compounds  5. Metallic carbonates  6. Metallic chlorates

 1. Nonmetal Oxides Or Metal Oxides  Nonmetal Oxide → Nonmetal + Oxygen  2SO 3 (g) → 2S(s) + 3O 2 (g)  Metal Oxides → Metal + Oxygen  2Na 2 O(s) → 4Na(s) + O 2 (g)  2. Metal Hydroxides → Metal oxide + Water  Ca(OH) 2 (s) → CaO(s) + H 2 O(l)  3. Acids → Nonmetal oxide + Water  H 2 SO 4 (aq) → SO 3 (g) + H 2 O(l)

 4. Salts and covalent compounds  Salts → Metal + Nonmetal  2NaCl(s) → 2Na(s) + Cl 2 (g)  Covalent compounds → Nonmetal + Nonmetal  2BH 3 → 2B(s) + 3H 2 (g)  5. Metallic carbonates → Metallic Oxide + Carbon Dioxide  CaCO 3 (s) → CaO(s) + CO 2 (g)  6. Metallic chlorates → Metallic Chloride + Oxygen  2KClO 3 → 2KCl + 3O 2

 SrO(s) → ?  2SrO(s) → 2Sr(s) + O 2 (g)  MgS(s) → ?  MgS(s) → Mg(s) + S(s)  SiO 2 → ?  SiO 2 → Si(s) + O 2( g)  Ba(OH) 2 (s) → ?  Ba(OH) 2 (s) → BaO(s) + H 2 O(l)  H 2 SO 4 (aq)→ ?  H 2 SO 4 (aq)→ SO 3 (g) + H 2 O(l)  NCl 3 (s)→ ?  2NCl 3 (s)→ N 2 (g) + 3Cl 2 (g)  Li 2 CO 3 → ?  Li 2 CO 3 → Li 2 O(s) + CO 2 (g)  Fe(ClO 3 ) 2 → ?  Fe(ClO 3 ) 2 → FeCl 2 + 3O 2