2. Chemical Changes and Equations An Investigation of Four Types of Chemical Reactions

3. Synthesis Magnesium ribbon is heated in air Mg (s) + O 2 (g)  MgO (s) Water is added to the product MgO (s) + H 2 O (l)  NH 3 (g) But, where does the N come from?

4. Synthesis Magnesium ribbon is heated in air Mg (s) + O 2 (g)  MgO (s) Mg (s) + N 2 (g)  Mg 3 N 2 (s) Water is added to the product Mg 3 N 2 Mg 3 N 2 (s) + H 2 O (l)  NH 3 (g) +Mg(OH) 2 (aq)

5. Decomposition Copper (II) Carbonate is heated CuO (s) CuCO 3 (s)  CO 2 (g) + How do you know CO 2 is a product? CaCO 3 (s) + Ca(OH) 2 (aq)  H 2 O (l) CO 2 (g) + CaCO 3 (s) + So why did it clear up?

6. CO 2 (g) + H 2 O (l)  H 2 CO 3 (aq) H 2 CO 3 (aq)  2H + + CO 3 2- 2H + + CaCO 3  H 2 CO 3 (aq) + Ca 2+

7. Single Displacement HCl (aq)  Zn (s) +ZnCl 2 (aq) + Zinc is added to hydrochloric acid H 2 (g) How do you know the gas is hydrogen? H 2 O (g) + O 2 (g)  H 2 (g) +

8. Double Displacement Two solutions are mixed Which one is the yellow precipitate? Check the solubility of each product. Pb(NO 3 ) 2 (aq) + KI (aq)  PbI 2 +KNO 3

9. Double Displacement Two solutions are mixed Which one is the yellow precipitate? Check the solubility of each product. Pb(NO 3 ) 2 (aq) + KI (aq)  PbI 2(s) +KNO 3(aq)

10. Combustion Hydrocarbons are burned in oxygen C 3 H 8(g) + O 2(g)  CO 2 + H 2 O

11. Double Displacement Two solutions are mixed Na 2 SO 4 (aq) + BaCl 2 (aq)  BaSO 4 +NaCl Which one is the white precipitate? Check the solubility of each product.

12. Double Displacement Two solutions are mixed Which one is the white precipitate? Check the solubility of each product. Na 2 SO 4 (aq) + BaCl 2 (aq)  BaSO 4(s) +NaCl (aq)