Experiment on Cellulose 2.0

Question 1

___, a fibrous carbohydrate found in all plants, is the structural component of plant cell walls.

Answer 1

Cellulose

Question 2

Because the earth is covered with vegetation, cellulose is the most abundant of all carbohydrates, accounting for over ___% of all
the carbon found in the vegetable kingdom.

Answer 2

50

Question 3

Cotton fibrils and filter paper are entirely cellulose (about ___%)

Answer 3

95

Question 4

Branch of Starch

Answer 4

Moderately branched

Question 5

Branch of Glycogen

Answer 5

Highly branched

Question 6

Branch of Cellulose

Answer 6

Unbranched

Question 7

Solubility of Cellulose in WATER (H20)

Answer 7

INSOLUBLE

Question 8

Solubility of Cellulose in CONC. H2SO4 (CONCENTRATED SULURIC ACID)

Answer 8

SOLUBLE

Question 9

Solubility of Cellulose in DILUTE H2SO4

Answer 9

INSOLUBLE

Question 10

Solubility of Cellulose in CONC. NaOH (CONCENTRATION OF SODIUM HYDROXIDE)

Answer 10

SLIGHTLY SOLUBLE

Question 11

Solubility of Cellulose in DILUTE NaOH

Answer 11

INSOLUBLE

Question 12

IODINE TEST: STARCH + IODINE
= ?

Answer 12

Deep Blue

Question 13

COTTON + IODINE
= ?

Answer 13

YELLOW TO BROWN TO BLACK

Question 14

SCHWEITZER’S Reagent is?

Answer 14

(Ammoniacal Cupric Hydroxide)

Question 15

IS THE FILTER PAPER SOLUBLE IN SCHWEITZER’S REAGENT?

Answer 15

(YES) SOLUBLE

Question 16

DESCRIBE THE REACTION OF THE SOLUTION (Ammoniacal Cupric Hydroxide) TO ACETIC ACID.

Answer 16

CELLULOSE PRECIPITATES WHEN ACETIC ACID WAS ADDED
TURNING INTO A LIGHT GREEN COLOR.

Question 17

WHAT IS FORMED IN THIS REACTION? (SCHWEITZER’S TEST)

Answer 17

AMORPHOUS PRECIPITATE

Question 18

CROSS & BEAVAN’S TEST reagent is?

Answer 18

(Zinc Chloride)

Question 19

DESCRIBE THE SOLUBILITY OF THE FILTER PAPER IN CROSS & BEAVAN’S SOLUTION:

Answer 19

CELLUOSE DISSOLVES IN THE SOLUTION (SOLUBLE)

Question 20

DESCRIBE THE REACTION AFTER THE ADDITION OF 95% ETHYL ALCOHOL.

Answer 20

-THERE IS A REPRECIPITATION OF CELLULOSE

Question 21

WHAT IS FORMED? CROSS & BEAVAN’S TEST

Answer 21

AMORPHOUS PRECIPITATE

Question 22

FORMATION OF AMYLOID: DESCRIBE THE PRODUCT FORMED AFTER THE FILTER PAPER DISSOLVED.

Answer 22

A JELLY SOLUTION WAS FORMED

Question 23

FORMATION OF AMYLOID: DESCRIBE THE PRODUCT FORMED WHEN FILTRATE ON A WATCH GLASS

Answer 23

A WAXY SUBSTANCE WAS FORMED (AMYLOID)

Question 24

AMYLOID REACTION TO BENEDICT’S TEST

Answer 24

COLORLESS SOLUTION

Question 25

WHAT DOES THIS MEAN? (AMYLOID REACTION TO BENEDICT’S TEST)

Answer 25

THERE IS A RLATIVELY SMALL NUMBER OF REDUCING SUGAR
MOIETIES, WHICH ONLY OCCURS AT THE END OF CARBOHYDRATE
CHAIN

Question 26

AMYLOID REACTION TO IODINE TEST

Answer 26

REDDISH- BROWN REACTION

Question 27

WHAT DOES THIS MEAN? (AMYLOID REACTION TO IODINE TEST)

Answer 27

APPEARANCE OF AN AMYLOSE-IODINE COMPLEX