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Chapter 15: Q. 15.17 (page 517)

What is the difference in the location of the first double bond in an omega-3and an omega-6-fatty acid (see Chemistry Link to Health "Omega-3-Fatty Acids in Fish Oils")?

Short Answer

Expert verified
  • Linolenic acid is an omega-3-fatty acid, with its initial double bond at carbon3.
  • Linoleic acid is an omega-6-fatty acid, with its initial double bond at carbon6.

Step by step solution

01

Introduction

  • Saturated and unsaturated fatty acids are the two types available.
  • Unsaturated fatty acids are formed when a lengthy chain of carboxylic acids contains double or triple bonds.
  • A fatty acid chain is said to be saturated when it contains all of the single bonds in its structure.
02

Explanation for Omega-3

  • A double bond exists on carbon 3counting the methyl group in an omega-3 fatty acid.
  • Linolenic acid is an omega-3fatty acid, with its initial double bond at carbon 3.

03

Explanation for Omega-6

  • A double bond starts at carbon 6counting from the methyl group in an omega-6 fatty acid.
  • Linoleic acid is an omega-6fatty acid, with its initial double bond at carbon 6.

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Most popular questions from this chapter

1.00mole of glyceryl trioleate (triolein) is completely hydrogenated.

a. Draw the condensed structural formula for the product.

b. How many moles of hydrogen are required?

c. How many grams of hydrogen are required?

d. How many liters of hydrogen gas are needed if the reaction is run at STP?

Palm oil has a high level of glyceryl tripalmitate (tripalmitin). Draw the condensed structural formula for glyceryl tripalmitate (15.2,15.3).

A sink drain can become clogged with solid fat such as glyceryl tristearate (tristearin)

a. How would adding lye NaOHto the sink drain remove the blockage?

b. Write a balanced chemical equation for the reaction that occurs.

c. How many milliliters of a 0.500MNaOHsolution are needed to completely react with 10.0gof glyceryl tristearate (tristearin)?

The total kilocalories and grams of fat for some typical meals at fast-food restaurants are listed here. Calculate the number of kilocalories and the percentage of total kilocalories from fat ( 1gram of fat =9kcal. Round answers to the tens place.

a. a beef burrito, 470kcal,21gof fat

b. deep-fried fish (three pieces), 480kcal,28gof fat

c. a jumbo hot dog, 180kcal,18gof fat

The plastic known as PETE (polyethyleneterephthalate) is used to make plastic soft drink bottles and containers for salad dressing, shampoos, and dishwashing liquids. PETE is made from terephthalic acid and ethylene glycol. Today, PETE is the most widely recycled of all plastics. In one year, 1.5×109lbof PETE is recycled. After it is separated from other plastics, PETE can be used in polyester fabric, doormats, and tennis ball containers. The density of PETE is 1.38g/ml.

a. Draw the line-angle formula for the ester formed from one molecule of terephthalic acid and one molecule of ethylene glycol.

b. Draw the line-angle formula for the product formed when a second molecule of ethylene glycol reacts with the ester you drew in part a.

c. How many kilograms of PETE is recycled in one year?

d. What volume, in litres, of PETE is recycled in one year?

e. Suppose a landfill holds 2.7×107L of recycled PETE. If all the PETE that is recycled in a year were placed instead in landfills, how many would it fill?
See all solutions

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