1. Module 5

1.13. Page 2

Module 5 Lesson 3

Module 5—Hydrocarbons and the Petroleum Industry

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Constructing Ethene


TR 1. Ethene, the hydrocarbon plant hormone, has the chemical formula C2H4. Use materials in your home or classroom to build a model of the ethene molecule. Remember that each carbon atom must bond four times in order to achieve stability.

 

TR 2. Write the chemical structure and the condensed chemical structure for the molecule you constructed.

 

Save the structure you built—you will refer back to it later in this lesson. You may wish to check your work with your teacher.

 

Read


Read pages 374–376 in the textbook to learn more about the structure of alkenes and alkynes and how to name and draw structures for these compounds. Complete “Communication example 1” on page 375 and “Communication example” 2 on page 376 of the textbook.


Self-Check

 

SC 1. Use materials in your home or school to construct models or draw chemical structures for four isomers of C4H8. Complete a table like the one provided here to summarize information about the isomers of C4H8.

 

When building your models, remember that each carbon atom must bond four times in order to achieve stability; each hydrogen can only bond once.

 

 

Isomer of C4H8

Structural Formula

 

 

 

 

Condensed Structural Formula

 

 

 

 

Line Diagram

 

 

 

 

Name

 

 

 

 

Type of Hydrocarbon

 

 

 

 

 

Check your work.

 

Read


Read the section “Cycloalkenes and Cycloalkynes” on pages 376–377 in the textbook.

 

Self-Check

 

SC 2. Complete “Practice” questions 1–5 and 7 on page 377 in the textbook.


Check Your Work Button

 

Read


Alkenes and other unsaturated hydrocarbons can exist naturally but are usually found in very low quantities. As a result, they are more often made from other hydrocarbons. Because it is used to produce a variety of products, including plastics, ethane is one of the most desirable hydrocarbons.

 

Ethane is produced by a process called cracking. Read more about ethane cracking on pages 378–379 in the textbook.

 

cracking: a process in which larger hydrocarbon molecules are converted into smaller hydrocarbon molecules

Compare the chemical reactions for cracking shown on page 379 with the hydrogenation reaction shown on page 374 in the textbook. Can you identify any relationship, similarities, and differences between the two reaction types?

 

Module 5: Lesson 3 Assignment


Retrieve your copy of Module 5: Lesson 3 Assignment that you saved to your computer earlier in this lesson. Complete the Assignment and save it in your course folder. You will receive information later in the lesson on when to submit your work to your teacher.