Organic Molecules

Question 1

called molecules of life

Answer 1

organic compounds

Question 2

tests can be used to detect the presence of

Answer 2

lipids
proteins
carbohydrates

Question 3

test used to detect the presence of reducing sugars

Answer 3

Benedict’s Test

Question 4

materials needed for Benedict’s Test

Answer 4

Benedict solution
beaker with water
water bath

Question 5

how to do Benedict’s Test

Answer 5

mix the benedict’s solution with the solution to be tested and place under water bath

Question 6

results of Benedict’s test when there is no reducing sugar

Answer 6

color blue

Question 7

results of Benedict’s test when there is high traces of reducing sugar

Answer 7

color brick red

Question 8

range of colors from no reducing sugar to high

Answer 8

blue - green - yellow - orange - red

Question 9

used to test the starch in the solution

Answer 9

Iodine test

Question 10

materials needed for Iodine test

Answer 10

iodine solution

Question 11

how to do the iodine test

Answer 11

add a few drops of iodine into the solution

Question 12

result of iodine when there is no starch

Answer 12

brown/yellow

Question 13

result of iodine when there is starch

Answer 13

blue/purple

Question 14

used to test the presence of proteins

Answer 14

Biuret’s Test

Question 15

materials needed for Biuret’s test

Answer 15

1mL of the solution
4mL of 10% NaOH (Sodium hydroxide)
few drops of 1% CuSO (Copper sulfate)

Question 16

how to do Biuret’s Test

Answer 16

place 4mL of 10% Sodium Hydroxide with 1mL of solution to be tested, add a few drops of 1% Copper sulfate

Question 17

negative Biuret’s test is color

Answer 17

blue

Question 18

positive biuret’s test is colored

Answer 18

deep purple

Question 19

used to test the presence of lipid

Answer 19

lipid test

Question 20

material needed for lipid test

Answer 20

filter paper

Question 21

how to do lipid test

Answer 21

place a drop in the filter paper, air dry

Question 22

result when lipid is present

Answer 22

translucent spot in the filter paper

Question 23

result when lipid is negative

Answer 23

no spot in the filter paper

Question 24

potato when tested for organic compound

Answer 24

Benedict (negative)
Iodine (Positive)
Biuret (negative)
Spot (negative)

Question 25

bread when tested for organic compound

Answer 25

Benedict (positive)
Iodine (positive)
Biuret (positive)
Lipid (negative)

Question 26

Pineapple when tested for organic compound

Answer 26

Benedict (positive)
Iodine (negative)
Biuret (negative)
Lipid (negative)

Question 27

Butter when tested for organic compounds

Answer 27

Benedict (negative)
Iodine (negative)
Biuret (positive)
Lipid (positive)

Question 28

Egg when tested for organic compounds

Answer 28

Benedict (negative)
Iodine (negative)
Biuret (positive)
Lipid (positive)

Question 29

most abundant and diverse class of organic compounds occurring in nature

Answer 29

carbohydates

Question 30

carbohydrates are defined as

Answer 30

polyhdroxy aldehydes or ketones

Question 31

four chemical groups of carbohydrates

Answer 31

monosaccharides, disaccharides, oligosaccharides, polysaccharides

Question 32

difference between ketone and aldehyde

Answer 32

oxygen is located on internal carbon rather than terminal one

Question 33

non reducing sugars do not have

Answer 33

OH group

Question 34

test for specific carbohydrates

Answer 34

Molisch’s Test