G12: Isomers, Hydrocarbons, and Carbon Rings

G12: Isomers, Hydrocarbons, and Carbon Rings

Objectives:

- explain isomers and hydrocarbons

- describe the relationship between hydrocarbons and boiling point

-describe carbon rings (describe and draw example) from chapter 1/section 1

STARTER ACTIVITY: READ

Even though you likely see gasoline-powered vehicles everyday, you rarely see what gasoline itself looks like! To the eye, gasoline is a pretty uninteresting yellowish-brown liquid. At the molecular level, gasoline is actually made up of a range of different molecules, most of them hydrocarbons (molecules containing only hydrogen and carbon atoms).

The molecular geometries of hydrocarbons are directly related to the physical and chemical properties of these molecules. Molecules that have the same molecular formula but different molecular geometries are called isomers. There are two major classes of isomers: structural-isomers and stereo-isomers.

LMS ASSIGNMENT

• WORK ON LMS ASSIGNMENTS (CHAPTER 1)

WHAT'S A HYDROCARBON

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CLASSDOJO ASSIGNMENT: HYDROCARBONS

EXPLAIN HYDROCARBONS AND DRAW ONE EXAMPLE OF A HYDROCARBON. SEND THIS ASSIGNMENT ON CLASSDOJO.

YOU CAN USE CHAPTER 1/SECTION 1 IN THE CHEMISTRY BOOK TO HELP YOU WITH THIS ASSIGNMENT

HYDROCARBONS AND BOILING POINT

As the chain length (numbers of carbons) increases, the melting and boiling points increase in hydrocarbon compounds. The reason that longer carbon-chain molecules have higher boiling points is that longer chain molecules can become wrapped around each other like strands of spaghetti, making them more resistant to effects of heat.

Multiple Choice

Which best explains the relationship between hydrocarbons and boiling point?

• the number of carbons decrease (lower) the boiling point

• boiling point does not affect hydrocarbons

• boiling point of hydrocarbons increase when the number of carbons increase

• melting point and boiling point stay the same

CARBON RINGS

Introduction to Rings:

Many organic compounds contain rings of carbon atoms. The simplest ring compound contains 3 carbons as in cyclopropane. The most common ring compounds contain either 5 or 6 carbons.

LMS ASSIGNMENT

• CONTINUE WORKING ON LMS ASSIGNMENTS (CHAPTER 1)