1. How can we tell if a reaction takes place?

2. There are four clues: 1. _______________ 2. _______________ 3. _______________ 4. _______________

3. How can we tell if a reaction takes place? There are four clues: 1. Heat or light is given off 2. _______________ 3. _______________ 4. _______________

4. How can we tell if a reaction takes place? There are four clues: 1. Heat or light is given off 2. A gas is produced 3. _______________ 4. _______________

5. How can we tell if a reaction takes place? There are four clues: 1. Heat or light is given off 2. A gas is produced 3. A precipitate forms 4. _______________

6. How can we tell if a reaction takes place? There are four clues: 1. Heat or light is given off 2. A gas is produced 3. A precipitate forms 4. A change in color occurs

7. Type of Reactions Chemical reactions are classified into six general types Synthesis

8. Two or more elements or simple compounds combine to form (synthesize) one product A + B AB 2Mg + O 2 2MgO 2Na + Cl 2 2NaCl SO 3 + H 2 OH 2 SO 4

9. Type of Reactions Chemical reactions are classified into six general types Synthesis Decomposition

10. One substance is broken down (split) into two or more simpler substances. ABA + B 2HgO2Hg + O 2 2KClO 3 2KCl + 3 O 2

11. Types of Reactions Classify the following reactions as 1) synthesis or 2) decomposition: ___A. H 2 + Br 2 2HBr ___B. Al 2 (CO 3 ) 3 Al 2 O 3 + 3CO 2 ___C. 4 Al + 3C Al 4 C 3

12. Solution Classify the following reactions as 1) combination or 2) decomposition: _1_A. H 2 + Br 2 2HBr _2_B. Al 2 (CO 3 ) 3 Al 2 O 3 + 3CO 2 _1_C. 4 Al + 3C Al 4 C 3

13. Special Decomposition Reactions Metallic Carbonates decompose to form metallic oxides and carbon dioxide CaCO 3 CaO + CO 2 Al 2 (CO 3 ) 3 Al 2 O 3 + 3 CO 2

14. Special Decomposition Reactions Metallic Hydrogen Carbonates (bicarbonates) decompose to form metallic oxides, carbon dioxide and water 2NaHCO 3 Na 2 O + H 2 O + 2CO 2 2 Al(HCO 3 ) 3 Al 2 O 3 + 3 H 2 O + 6 CO 2

15. Special Decomposition Reactions Metallic Chlorates decompose into metallic chlorides and oxygen 2KClO 3 2KCl + 3O 2 Ni(ClO 3 ) 4 NiCl 4 + 6O 2

16. Type of Reactions Chemical reactions are classified into six general types Synthesis Decomposition Single Replacement

17. One element takes the place of an element in a reacting compound. A + BC AB + C Zn + 2HCl ZnCl 2 + H 2 Fe + CuSO 4 FeSO 4 +Cu 2KI + Cl 2 2KCl + I 2

18. Type of Reactions Chemical reactions are classified into six general types Synthesis Decomposition Single Replacement Double Replacement

19. Two elements in reactants take the place of each other AB + CD AD + CB AgNO 3 + NaCl AgCl + NaNO 3 ZnS + 2HCl ZnCl 2 +H 2 S

20. Classifying Reactions Classify the following reactions as 1) single replacement 2) double replacement __ A. 2Al + 3H 2 SO 4 Al 2 (SO 4 ) 3 + 3H 2 __B. Na 2 SO 4 + 2AgNO 3 Ag 2 SO 4 + 2NaNO 3 __C. 3C + Fe 2 O 3 2Fe + 3CO

21. Solution Classify the following reactions as 1) single replacement 2) double replacement 1_ A. 2Al + 3H 2 SO 4 Al 2 (SO 4 ) 3 + 3H 2 2_B. Na 2 SO 4 + 2AgNO 3 Ag 2 SO 4 + 2NaNO 3 1_C. 3C + Fe 2 O 3 2Fe + 3CO

22. Type of Reactions Chemical reactions are classified into six general types Synthesis Decomposition Single Replacement Double Replacement Combustion

23. A reaction in which a compound (most often carbon) reacts with oxygen C + O 2 CO 2 CH 4 + 2O 2 CO 2 + 2H 2 O C 3 H 8 + 5O 2 3CO 2 + 4H 2 O C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O

24. Type of Reactions Chemical reactions are classified into six general types Synthesis Decomposition Single Replacement Double Replacement Combustion Neutralization

25. A reaction in which a base (contains OH - ) reacts with an acid (contains H + ) to produce a salt and water NaOH + HClNaCl + H 2 O H 2 SO 4 + 2NaOH Na 2 SO 4 + 2H 2 O

26. Balancing Equations Balance the combustion equation ___C 5 H 12 + ___O 2 ___CO 2 + ___H 2 O

27. Solution Balance the combustion equation 1 C 5 H 12 + 8 O 2 5 CO 2 + 6 H 2 O