1. Redox and Synthesis

2. Redox and Synthesis: At the conclusion of our time together, you should be able to: 1.Recognize a synthesis chemical reaction 2.Show the change in oxidation numbers in this reaction type

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4. Decomposition Simple Reactions Synthesis (Combination) Single Replacement Double Replacement

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7. 1. Synthesis reactions Synthesis reactions occur when two substances (generally elements) combine and form a compound. (Sometimes these are called combination or addition reactions.) Synthesis reactions occur when two substances (generally elements) combine and form a compound. (Sometimes these are called combination or addition reactions.) reactant + reactant  1 product Basically: A + B  AB Basically: A + B  AB Example: 2H 2 + O 2  2H 2 O Example: 2H 2 + O 2  2H 2 O Example:C + O 2  Example:C + O 2  CO 2

8. Synthesis Reactions Here is another example of a synthesis reaction Here is another example of a synthesis reaction

9. Synthesis and Redox Predict the products, balance the following reaction and give the change in oxidation numbers: Predict the products, balance the following reaction and give the change in oxidation numbers: Na + Cl 2  NaCl NaCl 2 Na + Cl 2  2 NaCl Each Na loses 1e - oxidation, reducing agent 2 Na o - 2e -  2 Na + Each Cl gains 1e - reduction, oxidizing agent 2 Cl o +2e -  2 Cl -

10. Synthesis and Redox Have one main purpose: Have one main purpose: To make a more complex compound!! To make a more complex compound!!

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12. Redox and Synthesis: Let’s see if you can: 1.Recognize a synthesis chemical reaction 2.Show the change in oxidation numbers in this reaction type

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14. Practice Predict the products. Write and balance the following synthesis reaction equations. Predict the products. Write and balance the following synthesis reaction equations. Sodium metal reacts with chlorine gas Sodium metal reacts with chlorine gas Na (s) + Cl 2(g)  Na (s) + Cl 2(g)  Solid Magnesium reacts with fluorine gas Solid Magnesium reacts with fluorine gas Mg (s) + F 2(g)  Mg (s) + F 2(g)  Aluminum metal reacts with fluorine gas Aluminum metal reacts with fluorine gas Al (s) + F 2(g)  Al (s) + F 2(g)  NaCl MgF 2 AlF 3

15. Practice (Page 55:4) State the type, predict the products, balance the following reactions and show the change in oxidation numbers: State the type, predict the products, balance the following reactions and show the change in oxidation numbers: Zn + S 8  ZnS ZnS 8 Zn + S 8  8 ZnS Each Zn loses 2e - oxidation, reducing agent 8 Zn o - 16e -  8 Zn 2+ Each S gains 2e - reduction, oxidizing agent 8 S o +16e -  8 S 2-

16. I don’t feel so stupid now…