Chemistry Lab Questions

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. Cornstarch (1 point) Positive
d. Unknown 1 (1 point) Negative
e. Unknown 2 (1 point)Positive
f. Unknown 3 (1 point)Negative
g. Unknown 4 (1 point)Negative
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)

a. Oil (O) (1 point) Positive
b. Butter (B) (1 point) Positive
c. Flour (F) (1 point) negative
d. Unknown 1 (1 point)positive
e. Unknown 2 (1 point)negative
f. Unknown 3 (1 point)positive
g. Unknown 4 (1 point)negative
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)Positive
b. Water (1 point)Negative
c. Gelatin (1 point)Negative
d. Unknown 1 (1 point)Positive
e. Unknown 2 (1 point)Positive
f. Unknown 3 (1 point)Positive
g. Unknown 4 (1 point)Positive
6. Report the results from the catalase test. (3 points)
a. Liver
Is catalase present? Yes/No (1 point) Yes
b. Roast beef
Is catalase present? Yes/No (1 point) Yes
c. Student supplied meat (provide name of meat) Chicken
Is catalase present? Yes/No (1 point): Yes
7. List the