2.2.7 Lipids and Ester Bonds Flashcards

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1
Q

What is a lipid?

A

Lipids are macromolecules that contain carbon, hydrogen and oxygen atoms.

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2
Q

How do we test for lipids?

A

We use the emulsion test. Add a food sample to a test tube. Then, add ethanol to the same test tube and shake. Pour the solution into a clean test tube and observe the results. If lipids are present, a milky emulsion will occur.

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3
Q

Give the main 2 properties of lipids.

A

They are HYDROPHOBIC. (insoluble in water) and NON-POLAR (an uncharged molecule due to the equal balance in electrons).

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4
Q

Give the 2 groups of lipids we need to know at A Level.

A

Tryglycerides and Phopholipids.

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5
Q
  1. Give two properties of tryglycerides.
    2.Give the 2 comonents they are made up of.
A
  1. They are NON-POLAR and HYDROPHOBIC.
  2. 1 molecule of GLYCEROL and 3 molecules of FATTY ACIDS.
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6
Q

What is the shortened chemical formula for fatty acids?

A

RCOOH

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