Nutrients

Question 1

iodine test

Answer 1

add a drop of iodine SOLUTION to the substance, if there is starch it will change to blue black

Question 2

ethanol test

Answer 2

add 2 cm^3 of ethanol solution to the substance, and shake thoroughly. Add 2 cm^3 of water to the mixture and shake thoroughly again. Observe for emulsification for fats

Question 3

benedict’s test

Answer 3

heat boiling bath, add equal volume of benedict’s solution and substance, allow test tubes to boil, observe if the tone changes to a shade of red, reduccing sugars

Question 4

biuret test

Answer 4

add equal volume of sodium hydroxide and substance. add copper sulfate drop by drop for 20 drops and observe if the colour changes from purple to light blue. Proteins

Question 5

3 functions of the food

Answer 5

energy for activities, converted to protoplasm, keep body healthy.

Question 6

3 functions of water

Answer 6

solvent for chemical reactions, control body temperature, transport dissolved substances,

Question 7

3 functions of fats

Answer 7

store of energy, essential part of protoplasm, insulation

Question 8

3 functions of proteins?

Answer 8

synthesis of new protoplasm, form antibodies, synthesis enzyme and hormones

Question 9

Reaction where a water molecule is needed to break up a complex molecule

Answer 9

Hydrolysis

Question 10

Reaction where a water molecule if given to turn a simple substance to a more complex substance

Answer 10

Condensation reaction

Question 11

Fats broken down

Answer 11

glycerol molecule and 3 fatty acid molecules

Question 12

Why proteins must be broken down?

Answer 12

because it is too large to pass through the cell surface membrane of a cell