Carbohydrate and Points

LAB 2
1.Identify the functional group or molecule for each of the following. (3 points)

a.COOH temp
b.COH temp
c.COH temp
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)
b.table sugar (1 point)
c.unknown 1 (1 point)
d.unknown 2 (1 point)
e.unknown 3 (1 point)
f.unknown 4 (1 point)
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)
b.water (1 point)
c.cornstarch (1 point)
d.unknown 1 (1 point)
e.unknown 2 (1 point)
f.unknown 3 (1 point)
g.unknown 4 (1 point)
4.The Sudan III test has been performed for you. Please see the image below to answer question 4a-g: Were the following substances positive or negative for lipids, as indicated by the Sudan III test? (7 points)

Sudan III Test Results
Click on image to enlarge.

a.oil (1 point)
b.butter (1 point)
c.flour (1 point)
d.unknown 1 (1 point)
e.unknown 2 (1 point)
f.unknown 3 (1 point)
g.unknown 4 (1 point)
5.List whether each of the following substances was positive or negative for protein, as indicated by the Biuret test. (7 points)

a.chicken soup (1 point)
b.water (1 point)
c.gelatin (1 point)
d.unknown 1 (1 point)
e.unknown 2 (1 point)
f.unknown 3 (1 point)
g.unknown 4 (1 point)
6.Report the results from the catalase test. (3 points)

a.Liver

Catalase present? Yes/No (1 point)
b.Roast Beef

Catalase present? Yes/No (1 point)
c.Student supplied meat (provide name of meat):

Catalase present? Yes/No (1 point):
7.List the pH for each substance tested. (5 points)

a.vinegar (1 point)
b.shampoo (1 point)
c.lemon juice (1 point)
d.distilled water (1 point)
e.baking soda (1 point)
8.What was the purpose of using water as a sample in some of the tests performed in the lab? (2 points)
9.Four unknown samples were included in the lab kit: flax