1. Unit 5

2. Fe + O 2 → Fe 2 O 3 Fe = O = Fe = O = 1 23 2

3. Fe + O 2 → Fe 2 O 3 Fe = O = Fe = O = 1 23 2 2 2 NO GOOD!!!! Oxygen can’t be balanced!

4. Fe + O 2 → Fe 2 O 3 Fe = O = Fe = O = 1 23 2 32 66 44 4 BALANCED!!!! Work with oxygen and go to least common multiple!

5. NH 4 OH + H 2 SO 4  (NH 4 ) 2 SO 4 + HOH NH 4 = OH = H = SO 4 = NH 4 = OH = H = SO 4 = 1 1 2 1 2 1 1 1

6. NH 4 OH + H 2 SO 4  (NH 4 ) 2 SO 4 + HOH NH 4 = OH = H = SO 4 = NH 4 = OH = H = SO 4 = 1 1 2 1 2 1 1 1 2 2 2 2 2 2 BALANCED!!!!

8. 2K + 2H 2 O  2KOH + H 2 K = H = 0 = K = H = 0 = 2 4 2 2 4 2 BALANCED!!!!

9. KNO 3  KNO 2 + O 2 K = N = O = K = N = O = 1 1 3 1 1 4 2 2 2 2 2 2 BALANCED!!!! 6 6

10. C 4 H 8 + 6O 2  4CO 2 + 4H 2 O C = H = O = C = H = O = 4 8 12 4 8 BALANCED!!!!

11. AgNO 3 + NaCl  AgCl + NaNO 3 Ag = NO 3 = Na = Cl = 1 1 1 1 1 1 BALANCED!!!! Ag = NO 3 = Na = Cl = 1 1

13. five There are millions of chemical reactions, but we can classify them into five main types of reactions:  Synthesis  Decomposition  Single Displacement  Double Displacement  Combustion

14. combine Two or more substances combine to form another substance A+B → AB

15. Balance the following: Na + Cl 2 → NaCl Al + O 2 → Al 2 O 3 22 243

16. breaks down One substance decomposes, or breaks down, into two or more substances AB → A+B

17. Balance the following: CaCO 3 → CaO + CO 2 H 2 0 → H 2 + O 2 BALANCED!!!! 22

18. replaces One element replaces another element in a compound A+BC → AC+B

19. Balance the following: Cu + AgNO 3 → Ag + Cu(NO 3 ) 2 Mg + HCl → MgCl 2 + H 2 2 2 2

20. positive switch The positive ions of two compounds switch with each other to form two new compounds solutions Occur in solutions precipitatewatergas A precipitate, water, or a gas is formed

21. AB + CD → AD+ CB

22. Balance the following: CaCl 2 + AgNO 3 → Ca(NO 3 ) 2 + AgCl NaOH + HCl → NaCl + HOH 22 BALANCED!!!!

23. oxygen energy A carbon based substance reacts with oxygen to produce energy in the form of heat and light and CO 2 and H 2 O. burning aka burning

24. Balance the following: CH 4 + O 2 → CO 2 + H 2 O 22

25. Is there one product?Synthesis Is there one reactant? Decomposition Decomposition

26. Are CO 2 and H 2 O two of the Products?Combustion Is one element that is by itself replacing another in a compound? Single Replacement Are there only compounds that switch ions? Double Replacement