1. IIIIIIIVV 1. Santa consumes an estimated 262.2 million Calories on Christmas Eve. If you gain 0.45kg for every 3500 Calories, How many pounds does Santa gain in a 24 hour period? 2. Santa delivers presents to all “good” boys and girls at a rate of 1,178 homes/sec. How many homes does he visit in 24 hours? Santa Bellringer – Do the Math

2. IIIIIIIVV Pass out study guide

3. IIIIIIIVV Ch. 9 – Chemical Reactions II. Types of Chemical Reactions

4. A. Combustion CH 4 (g) + 2O 2 (g)  CO 2 (g) + 2H 2 O(g) n the burning of any substance in O 2 to produce heat A + O 2  B

5. Na(s)+ O 2 (g)  C 3 H 8 (g)+ O 2 (g)  5 3 4 A. Combustion n Products:  contain oxygen  hydrocarbons form CO 2 + H 2 O CO 2 (g)+ H 2 O(g) Na 2 O(s) 4 2

6. B. Synthesis n the combination of 2 or more substances to form a compound n only one product A + B  AB

7. B. Synthesis H 2 (g) + Cl 2 (g)  2 HCl(g)

8. Al(s)+ Cl 2 (g)  AlCl 3 (s) 2 3 2 B. Synthesis n Products:  ionic - cancel charges  covalent - hard to tell

9. C. Decomposition n a compound breaks down into 2 or more simpler substances n only one reactant AB  A + B

10. C. Decomposition 2 H 2 O(l)  2 H 2 (g) + O 2 (g)

11. C. Decomposition n Products:  There are 6 types of decomposition reactions

12. D. Single Replacement n one element replaces another in a compound  metal replaces metal (+)  nonmetal replaces nonmetal (-) A + BC  AC + B

13. D. Single Replacement Cu(s) + 2AgNO 3 (aq)  Cu(NO 3 ) 2 (aq) + 2Ag(s)

14. Fe(s)+ CuSO 4 (aq)  Cu(s)+Fe 2 (SO 4 ) 3 (aq) D. Single Replacement n Products:  metal  metal (+)  nonmetal  nonmetal (-)  free element must be more active (check activity series, Next slide) Br 2 (l)+ NaCl(aq)  No reaction-NR

15. Activity Series

16. AB + CD  AD + CB E. Double Replacement n ions in two compounds “change partners” n cation of one compound combines with anion of the other

17. Pb(NO 3 ) 2 (aq)+ KI(aq)  PbI 2 (s)+ KNO 3 (aq) E. Double Replacement n Products:  switch negative ions  Switch positive ions 2 2

18. IIIIIIIVV Enough Already Mr. Bidondo – For the Love of Pete Please stop!!

19. Day 2: Double Replacemen t n Some double replacement reactions are also known as Precipitation reactions. n Sometimes when aqueous (aq) solutions of ionic compounds are poured together, a solid forms. n A solid that forms from mixed solutions is called a precipitate.

20. Double Replacement Pb(NO 3 ) 2 (aq) + K 2 CrO 4 (aq)  PbCrO 4 (s) + 2KNO 3 (aq)

21. Precipitation reactions NaOH(aq) + FeCl 3 (aq)  NaCl(aq) + Fe(OH) 3 (s) Precipitate (solid) n A precipitate occurs if one of the products is insoluble (won’t dissolve). n See the “Solubility Rules” n Solubility rules are sequential; start with rule #1 always!

22. Solubility Rules

23. Precipitation reactions n Are these compounds soluble or will a precipitate form (insoluble)? n Na 2 SO 4 n AgNO 3 n AgCl n CuS n AgC 2 H 3 O 2 n BaSO 4

24. Precipitation reactions n Predict the products and tell if either product will be a precipitate: CdCl 2 (aq) + Na 2 S(aq) 

25. Double Replacement Reactions n Double replacement reactions can also be classified as “acid/base reactions”. n For example: n HNO 3 (aq) + Mg(OH) 2 (aq) AcidBase (One of the products is water)