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LecturePLUS Timberlake 99 Chapter 5 Chemical Reactions and Quantities Types of Reactions Oxidation-Reduction Reactions.

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Presentation on theme: "LecturePLUS Timberlake 99 Chapter 5 Chemical Reactions and Quantities Types of Reactions Oxidation-Reduction Reactions."— Presentation transcript:

1 LecturePLUS Timberlake 99 Chapter 5 Chemical Reactions and Quantities Types of Reactions Oxidation-Reduction Reactions

2 LecturePLUS Timberlake 99 Type of Reactions Chemical reactions are classified into four general types Combination Decomposition Single Replacement Double Replacement

3 LecturePLUS Timberlake 99 Combination (Synthesis) 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

4 LecturePLUS Timberlake 99 Decomposition One substance is broken down (split) into two or more simpler substances. ABA + B 2HgO2Hg + O 2 2KClO 3 2KCl + 3 O 2

5 LecturePLUS Timberlake 99 Learning Check R1 Classify the following reactions as 1) combination 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

6 LecturePLUS Timberlake 99 Solution R1 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

7 LecturePLUS Timberlake 99 Single Replacement 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

8 LecturePLUS Timberlake 99 Double Replacement 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

9 LecturePLUS Timberlake 99 Learning Check R2 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

10 LecturePLUS Timberlake 99 Solution R2 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

11 LecturePLUS Timberlake 99 Combustion A reaction in which a compound (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

12 LecturePLUS Timberlake 99 Learning Check R3 Balance the combustion equation ___C 5 H 12 + ___O 2 ___CO 2 + ___H 2 O

13 LecturePLUS Timberlake 99 Solution R3 Balance the combustion equation 1 C 5 H O 2 5 CO H 2 O

14 LecturePLUS Timberlake 99 Oxidation and Reduction Reactions that involve a loss or gain of electrons Occurs in many of the 4 types of reactions and combustion Important in food metabolism, batteries, rusting of metals

15 LecturePLUS Timberlake 99 Requirements for Oxidization- Reduction Electrons are transferred Two processes occur Oxidation = Loss of electrons (LEO) ZnZn e - Reduction = Gain of electrons (GER) Cu e - Cu

16 LecturePLUS Timberlake 99 Balanced Red-Ox Equations Combine the oxidation and reduction reactions to make Loss of electrons = Gain of electrons Zn + Cu e - Zn e - + Cu Zn + Cu 2+ Zn 2+ + Cu

17 LecturePLUS Timberlake 99 Gain/Loss of Hydrogen In organic and biological reactions oxidation = Loss of H reduction = Gain of H

18 LecturePLUS Timberlake 99 Learning Check R3 Identify the following as an 1) oxidation or a reduction process: __A. SnSn e- __B. Fe e - Fe 2+ __C. Cl 2 + 2e - 2Cl -

19 LecturePLUS Timberlake 99 Solution R3 Identify the following as an 1) oxidation or a reduction process: 1_ A. SnSn e- 2_ B. Fe e - Fe 2+ 2_ C. Cl 2 + 2e - 2Cl -

20 LecturePLUS Timberlake 99 Learning Check R4 In light-sensitive sunglasses, UV light initiates an oxidation-reduction reaction Ag + + Cl - Ag + Cl A. Which reactant is oxidized 1) Ag + 2) Cl - 3) Ag B. Which reactant is reduced? 1) Ag + 2) Cl - 3) Cl

21 LecturePLUS Timberlake 99 Solution R4 In light-sensitive sunglasses, UV light initiates an oxidation-reduction reaction Ag + + Cl - Ag + Cl A. Which reactant is oxidized 2) Cl - Cl - Cl + e - B. Which reactant is reduced? 1) Ag + Ag + + e- Ag


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