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Slide 1 of 16 Chemistry 22.2. © Copyright Pearson Prentice Hall Slide 2 of 16 22.2 Unsaturated Hydrocarbons Roach traps are baited with pheromones, which.

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Presentation on theme: "Slide 1 of 16 Chemistry 22.2. © Copyright Pearson Prentice Hall Slide 2 of 16 22.2 Unsaturated Hydrocarbons Roach traps are baited with pheromones, which."— Presentation transcript:

1 Slide 1 of 16 Chemistry 22.2

2 © Copyright Pearson Prentice Hall Slide 2 of Unsaturated Hydrocarbons Roach traps are baited with pheromones, which roaches produce to attract mates. The structure of many pheromones is based on unsaturated hydrocarbons. You will study two types of unsaturated hydrocarbons—alkenes and alkynes.

3 © Copyright Pearson Prentice Hall Unsaturated Hydrocarbons > Slide 3 of Alkenes What are the structural characteristics of alkenes?

4 © Copyright Pearson Prentice Hall Slide 4 of Unsaturated Hydrocarbons > Alkenes At least one carbon-carbon bond in an alkene is a double covalent bond. Other bonds may be single carbon-carbon bonds and carbon-hydrogen bonds.

5 Slide 5 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkenes Organic compounds that contain the maximum number of hydrogen atoms per carbon atom are called saturated compounds. Compounds that contain double or triple carbon-carbon bonds are called unsaturated compounds.

6 Slide 6 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkenes Alkenes are hydrocarbons that contain one or more carbon-carbon double covalent bonds.

7 Slide 7 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkenes Because rotation is restricted around the double bond, atoms in ethene lie in one plane. Ethene

8 © Copyright Pearson Prentice Hall Unsaturated Hydrocarbons > Slide 8 of Alkynes What are the structural characteristics of alkynes?

9 Slide 9 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkynes At least one carbon-carbon bond in an alkyne is a triple covalent bond. Other bonds may be single or double carbon- carbon bonds and single carbon- hydrogen bonds.

10 Slide 10 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkynes Hydrocarbons that contain one or more carbon-carbon triple covalent bonds are called alkynes. Straight-chain and branched-chain alkanes, alkenes, and alkynes are aliphatic hydrocarbons.

11 Slide 11 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkynes The triple bond restricts rotation in an ethyne molecule, which has a linear shape.

12 Slide 12 of 16 © Copyright Pearson Prentice Hall 22.2 Unsaturated Hydrocarbons > Alkenes

13 © Copyright Pearson Prentice Hall Slide 13 of 16 Section Quiz -or- Continue to: Launch: Assess students’ understanding of the concepts in Section 22.2 Section Quiz

14 © Copyright Pearson Prentice Hall Slide 14 of Section Quiz. 1. Alkenes and alkynes are called unsaturated compounds because they contain a.single bonds only. b.double or triple bonds. c.oxygen atoms. d.hydrogen atoms.

15 © Copyright Pearson Prentice Hall Slide 15 of Section Quiz. 2. What is the correct name for a compound with a C-C-C=C-C carbon skeleton? a.3-pentyne b.2-pentene c.3-pentene d.4-pentene

16 © Copyright Pearson Prentice Hall Slide 16 of Section Quiz. 3. Which of the following substances is an alkyne? a.C 6 H 12 b.C 2 H 4 c.C 2 H 2 d.C 4 H 8

17 END OF SHOW


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