1. OB: recognizing chemical reactions, balancing practice. Get out reference tables, and your reactions lab.

2. Synthesis and Decomposition Reactions: 2 or more small things make one larger product Or the reverse, One large reactant breaks down into 2 or more smaller products. Write balanced chemical equations from these 2 word equations. S: phosphorous and chlorine gas form into phosphorous pentachloride gas. D: Manganese VII oxide form manganese and oxygen gas

3. phosphorous and chlorine gas form into phosphorous pentachloride gas P (S) + Cl 2(G) PCl 5(G) skeleton

4. phosphorous and chlorine gas form into phosphorous pentachloride gas P (S) + Cl 2(G) PCl 5(G) 2P (S) + 5Cl 2(G) 2PCl 5(G) skeleton balanced

5. Manganese VII oxide form manganese and oxygen gas Mn 2 O 7(S) Mn (S) + O 2(G) skeleton

6. Manganese VII oxide form manganese and oxygen gas Mn 2 O 7(S) Mn (S) + O 2(G) 2Mn 2 O 7(S) 4Mn (S) + 7O 2(G) skeleton

7. Single Replacement Reactions (table J) Always start with one aqueous solution and an “atom”, and end with a different aqueous solution and a different atom. The atom can be diatomic. Sometimes it’s a cation switch, or an anion switch, or even nothing at all. Try writing balanced reactions for these three: Sodium goes into silver nitrate solution Bromine is added to lithium iodide solution Tin is added to barium nitrate solution

8. Skeleton Reactions first… Next Slide, balance them all! Sodium goes into silver nitrate solution Na (S) + AgNO 3(AQ) NaNO 3(AQ) + Ag (S) Bromine is added to lithium iodide solution Br 2(L) + LiI (AQ) LiBr (AQ) + I (S) Tin is added to barium nitrate solution Sn (S) + Ba(NO 3 ) 2 (AQ) Sn(NO 3 ) 2(AQ) + Ba (S)

9. Skeleton Reactions first… Next Slide, balance them all! Sodium goes into silver nitrate solution Na (S) + AgNO 3(AQ) NaNO 3(AQ) + Ag (S) Bromine is added to lithium iodide solution Br 2(L) + 2LiI (AQ) 2LiBr (AQ) + I 2(S) Tin is added to barium nitrate solution Sn (S) + Ba(NO 3 ) 2 (AQ) X Already balanced! Balanced! No reaction! OOPS!!!

10. Double Replacement Reactions Start with two aqueous ionic solutions, end with a different solution and a precipitate If your 2 AQ solutions form two new AQ solutoins, then all you have is a mixture. Turn these two word equations into balanced chemical equations. Vocab: soluble, insoluble, precipitate, aqueous, cations, anions. Lithium nitrate and potassium chloride solutions are poured together Lead (II) hydrogen carbonate and Cobalt (III) sulfate solutions are poured together

11. First the skeletons, then, balance and check table F (just switch the ions around, next slide we’ll “fix ‘em”. Lithium nitrate and potassium chloride solutions are poured together LiNO 3(AQ) + KCl (AQ) LiCl + KNO 3 Lead (II) hydrogen carbonate and Cobalt (III) sulfate solutions are poured together Pb(HCO 3 ) 2(AQ) + Co 2 (SO 4 ) 3(AQ) PbSO 4 + CoHCO 3 switched + fixed on next slide

12. First the skeletons, then, balance and check table F balanced on next slide just switch the ions around, next slide we’ll “fix ‘em”. Lithium nitrate and potassium chloride solutions are poured together LiNO 3(AQ) + KCl (AQ) LiCl + KNO 3 Lead (II) hydrogen carbonate and Cobalt (III) sulfate solutions are poured together Pb(HCO 3 ) 2(AQ) + Co 2 (SO 4 ) 3(AQ) PbSO 4 + Co(HCO 3 ) 3 ALL OK HERE Lead is +2 ion, sulfate is -2, okay there Cobalt is +3 ion, anion is only -1. FIXED

14. First the skeletons, then, balance and check table F balanced on next slide (just switch the ions around, next slide we’ll “fix ‘em”. Lithium nitrate and potassium chloride solutions are poured together LiNO 3(AQ) + KCl (AQ) LiCl (AQ ) + KNO 3 (AQ) Lead (II) hydrogen carbonate and Cobalt (III) sulfate solutions are poured together 3Pb(HCO 3 ) 2(AQ) + Co 2 (SO 4 ) 3(AQ) 3PbSO 4(S) + Co(HCO 3 ) 3(AQ) Mixture! Balanced! Check table F for soluble or insoluble

15. Combustion are always a hydrocarbon and oxygen forming water and carbon dioxide with heat. Vocab: hydrocarbon, oxygenated hydrocarbon, complete combustion, incomplete combustion, exothermic and endothermic. Balance these two combustion reactions: hexane combusts (C 6 H 14 ) Propanol combusts (C 3 H 5 OH) this is a type of alcohol.

16. First the skeletons, then both balanced: hexane combusts (C 6 H 14 ) C 6 H 14(L) + O 2(G) CO 2(G) + H 2 O (G) Propanol combusts (C 3 H 5 OH) this is a type of alcohol. C 3 H 5 OH (L) + O 2(G) CO 2(G) + H 2 O (G)

17. Balanced. hexane combusts (C 6 H 14 ) 2C 6 H 14(L) + 19O 2(G) 12CO 2(G) + 14H 2 O (G) Propanol combusts (C 3 H 5 OH) this is a type of alcohol. C 3 H 5 OH (L) + 4O 2(G) 3CO 2(G) + 3H 2 O (G)

18. CH 4(G) + 2O 2(G) → CO 2(G) + 2H 2 O (G) Complete combustion, only carbon dioxide forms CH 4(G) + O 2(G) → C (S) + 2H 2 O (G) Incomplete combustion, carbon forms because there is insufficient oxygen to make carbon dioxide. Carbon is the chemical name for SOOT.