Experiment on Cellulose 1.0

Question 1

It is the most abundant organic substance found in nature.

Answer 1

Cellulose (Vegetable Fiber)

Question 2

Cellulose is the chief structural component of ____ and ___.

Answer 2

Plants and Wood

Question 3

Cellulose is a ___ Fiber.

Answer 3

Vegetable Fiber

Question 4

Cellulose is an organic compound with the formula ___?

Answer 4

(C6H10O5)n

Question 5

Cellulose is a polysaccharide consisting of a ___?

Answer 5

Linear chain of several hundred to over ten thousand β(1→4) linked D-glucose units.

Question 6

Cellulose is highly ___ and resistant to ___

Answer 6

Insoluble, hydrolysis

Question 7

Reserved ___ in plants

Answer 7

Carbohydrates

Question 8

Is found in the ___ and ___ of all plants

Answer 8

Cell Walls, Woody Fibers

Question 9

The structural component of plants are formed primarily from?

Answer 9

Cellulose

Question 10

Wood is largely ___ & ___.

Answer 10

Cellulose and Lignin

Question 11

While ___ & ___ are nearly pure cellulose.

Answer 11

paper and cotton

Question 12

Humans and many other animals lack an enzyme to break the ___, so they do not digest cellulose.

Answer 12

beta-linkages

Question 13

Certain animals can digest cellulose, because 1) ___ are present in their 2) ___. The classic example is the 3) ___.

Answer 13

1) bacteria possessing the enzyme (cellulase), 2) gut, 3) termite

Question 14

Name the 5 Uses (Hint: CN, CA, AS/R, C, P)

Answer 14

1) Cellulose Nitrate – forms a transparent films
2) Cellulose Acetate – in the manufacture of safety motion picture, films for x-ray, acetate fabrics
3) Artificial silk or rayon
4) Cellophane
5) Paper

Question 15

Solubility of Cotton in Water

Answer 15

Insoluble

Question 16

Solubility of Cotton in Dilute Acids (Sulfuric Acid)

Answer 16

Insoluble

Question 17

Solubility of Cotton in Dilute Alkali (sodium Hydroxide)

Answer 17

Insoluble

Question 18

Solubility of Cotton in Concentrated Acids

Answer 18

Soluble

Question 19

Solubility of Cotton in Concentrated Alkali

Answer 19

Soluble

Question 20

Uses: Cellulose Nitrate

Answer 20

forms a transparent films

Question 21

Uses: Cellulose Acetate

Answer 21

in the manufacture of safety motion picture, films for x-ray, acetate fabrics

Question 22

IODINE TEST: Starch + Iodine = ?

Answer 22

Blue to violet

Question 23

IODINE TEST: Cotton + Iodine = ?

Answer 23

yellow to reddish brown

Question 24

SCHWEITZER’S TEST (Ammoniacal Cupric Hydroxide) is used to dissolve?

Answer 24

cellulose, silk and linen

Question 25

SCHWEITZER’S TEST: Filter paper + Schweitzer solution (Blue) + equal volume of water + HAc to acidify = ?

Answer 25

soluble

Question 26

Product formed from the Schweitzer’s Test?

Answer 26

Cellulose Acetate

Question 27

Cellulose acetate is made up of chains of glucose molecule units with molecular formula ___

Answer 27

C6H7O2(OH)3

Question 28

Cross and Beavan’s Test (Zinc Chloride): Cotton + Cross and beavans reagent = ?

Answer 28

Soluble

Question 29

Cross and Beavan’s Test (Zinc Chloride): Soluble + 1 ml 95% ethyl alcohol = ?

Answer 29

Ether

Question 30

Product formed from the Cross and Beavan’s Test (Zinc Chloride)

Answer 30

Cello Dextrin w/ precipitate

Question 31

Any gelatinous hydrate formed by the interaction of Sulfuric and cellulose.

Answer 31

Amyloid

Question 32

Any gelatinous hydrate formed by the interaction of 1) ___ and 2) ___.

Answer 32

1) Sulfuric Acid, 2) Cellulose

Question 33

Amyloid are ___ that share specific structural traits.

Answer 33

insoluble fibrous protein aggregates

Question 34

Amyloid are the product formed upon dissolving ___ in ___.

Answer 34

filter paper, concentrated Sulfuric acid

Question 35

Benedict’s and Iodine Test on Amyloid.

Answer 35

Amyloid solutions + 15 mL water (15-20 minutes) —– cool and Neutralize with 10% NaOH

Question 36

Hydrolysis of Cellulose

Answer 36

Cellulose —– Dextrin —– Cellobiose —– Glucose (end product)

Question 37

Intermediate products of the hydrolysis of cellulose are?

Answer 37

Dextrin and Cellobiose

Question 38

Disaccharide compose of 2 units glucose

Answer 38

Cellobiose

Question 39

Glucose + Benedict’s Test = ?

Answer 39

Brick red precipitate (+)

Question 40

Glucose + Iodine soln = ?

Answer 40

No change (Because Iodine is a starch test)