Lab 2 Essay

944 Words Aug 28th, 2014 4 Pages
LAB 2
1. Identify the functional group or molecule for each of the following. (3 points)
a. Carboxyl group/acid, aldehyde group
b. Hydroxyl group, alcohol group
c. Hydroxyl group, alcohol group
2. List whether each of the following substances was positive or negative for reducing sugar, as indicated by the Benedict's test. (6 points)
a. Corn syrup (1 point) Positive
b. Table sugar (1 point) Positive
c. Unknown 1 (1 point)Negative
d. Unknown 2 (1 point)Negative
e. Unknown 3 (1 point)Negative
f. Unknown 4 (1 point)Positive
3. List whether each of the following substances was positive or negative for starch, as indicated by using iodine. (7 points)
a. Onion juice (1 point) Negative
b. Water (1 point) Negative
c.
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Distilled water (1 point)7
e. Baking soda (1 point)9
8. What was the purpose of using water as a sample in some of the tests performed in the lab? (2 points) Water was used as a sample in some the tests performed as a control.
9. Four unknown samples were included in the lab kit: flax seed meal, potato starch, egg whites, and dried milk. Using the results of the biochemical testing, determine which number corresponds to the correct unknown. (8 points)
a. Unknown 1 (2 points) Egg whites
b. Unknown 2 (2 points)potato Starch
c. Unknown 3 (2 points)Flax seed meal
d. Unknown 4 (2 points)Dried milk
10. State a commercial use for biochemical testing as performed in this online laboratory. (5 points) A commercial use for biochemical testing as tested in this lab, is food testing.
11. Describe the three different types of bonds, providing examples of compounds (or interactions) formed through each type of bond. (3 points) The three types of bonds are ionic, covalent, hydrogen bonds. Ionic bonds occur when outermost electrons is exchanged from one element to another. Covalent bonds occur when two atoms give each other electrons. Hydrogen bonds occur between hydrogen and another element.
12. What is the difference between a monosaccharide, disaccharide, and a polysaccharide? (3 points) Monosaccharide is a single unit of sugar. Disaccharide is two monosaccharides that are created by cells through the process of the dehydration reaction. Polymers of

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