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SCI302B/303B/304B: Chemistry | Unit 7 | Lesson 2: Laboratory: Modeling Organic Compounds
Answer the questions below. When you have finished, submit this assignment to your teacher by the due date for
1. What is an isomer? How many possible isomers of heptane are there? What are the
structural differences between these isomers?
2. Look at page 54 in your Laboratory Guide. Note that butane has two possible isomers but that
decane has 75 possible isomers. Why does the number of possible isomers go up with an
increasing number of carbon atoms?
3. Look at the table of boiling points on page 54 of your Laboratory Guide. These are the boiling
points for the unbranched hydrocarbons listed. Consider your models and, drawing on your
knowledge of bonding and chemical forces, infer what might contribute to the increasing
boiling points as the carbon chains grow longer. Then state whether you think all of the
isomers of a compound have the same or different boiling points; give a reason for your answer.
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