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Redox Reactions Chapter 7. Redox Reactions Oxidation-Reduction (Redox) Reactions Redox reactions involve an electron transfer. These reaction occur between.

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Presentation on theme: "Redox Reactions Chapter 7. Redox Reactions Oxidation-Reduction (Redox) Reactions Redox reactions involve an electron transfer. These reaction occur between."— Presentation transcript:

1 Redox Reactions Chapter 7

2 Redox Reactions Oxidation-Reduction (Redox) Reactions Redox reactions involve an electron transfer. These reaction occur between metals and nonmetals. Ionic reactions are redox reactions.

3 The name There are two parties in a redox reaction. The one that is gaining electron(s). This one gets reduced. Think of the charge, it gets lower. The one that is losing electron(s). It gets oxidized.

4 Single Replacement Reaction Your book calls this a single displacement reaction. ~an atom or group switches its partner AX + B A + BX AgCl + Zn Ag + ZnCl CuSO 4 + Fe FeSO 4 + Cu FeO + Al Al 2 O 3 + Fe

5 What makes this a redox reaction? Follow the electron AgCl + Zn Ag + ZnCl Zinc starts out neutral, Ag is +, Cl is -. The compound is neutral but they still have their charges Then the reaction. Zinc gives an electron to silver making silver neutral, and zinc positive. e-e-

6 Double Replacement Reaction ~two atoms or groups switches their partners AX + BY AY + BX 2NiNO 3 + CaSO 4 Ca(NO 3 ) 2 + Ni 2 SO 4 NaCl + AgI NaI + AgCl All of the precipitation reactions/net ionic equations we have been doing have been double replacement reactions.

7 Synthesis (combination) Reactions ~simpler molecules build together and form more complex molecules A + B X 6 CO H 2 O C 6 H 12 O O 2 4 Zn + O 2 2 Zn 2 O

8 Decomposition Reactions ~more complex molecules break apart to form simpler molecules X A + B C 6 H 12 O O 2 6 CO H 2 O 2 H 2 O 2 H 2 + O 2

9 Combustion Reaction A chemical reaction involving oxygen that produces energy (heat) so rapidly that it produces a flame. CH 4 + O 2 CO 2 + H 2 O Natural gas combusting. Used for Bunsen burners, gas stoves, gas furnaces etc. C 8 H 18 _ + O 2 CO 2 + H 2 O Combustion of octane (gasoline) H 2 + O 2 H 2 O Combustion of hydrogen, used in a fuel cell

10 Flow Chart Reactions Precipitation Single/Double Replacement Redox Single/Double ReplacementDecomposition Combustion Synthesis Acid Base

11 Reactions dont fit into just one category Most fit into several of these. 2 H 2 + O 2 2 H 2 O This is a combustion reaction, and a synthesis reaction. All reactions be classified as single replacement, double replacement, synthesis or decomposition

12 Identify the type of reaction Mg + 2 HNO 3 Mg(NO 3 ) 2 + H 2 Single replacement (Redox) C 8 H 18 + O 2 CO 2 + H 2 O Decomposition (Combustion) FeO + HCl FeCl 2 + H 2 O Double replacement (Acid Base) Fe + O 2 Fe 2 O 3 Synthesis (combustion)

13 Continued K 3 PO 4 + Ca(SO 4 ) K 2 SO 4 +Ca 3 (PO 4 ) 2 Double replacement (redox, precipitation) Fe + HCl H 2 + FeCl 2 Single replacement (acid base) C 3 H 5 (NO 3 ) 3 N 2 + O 2 + CO 2 + H 2 O Decomposition (redox) Cu + O 2 CuO Synthesis (redox)


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