Digestion & Nutrition - Testing for Carbohydrates

Question 1

What do carbohydrates provide in our diet

Answer 1

energy

Question 2

What are the two types of carbohydrates

Answer 2

Starch, Sugar

Question 3

What is a hazard when using the Bunsen burner?

Answer 3

Open flame that people may not see

Question 4

What is the risk associated with an open flame that not everyone might be able to see

Answer 4

Burns if
people reach over it

Question 5

What do we do to keep safe?

Answer 5

Keep it on the safety
flame when not in use

Question 6

What do we call a large molecule made of lots of identical repeating units?

Answer 6

Polymer

Question 7

What is the repeating unit in starch

Answer 7

sugar

Question 8

What is a polymer ?

Answer 8

A large molecule made of many repeating units is known as a polymer

Question 9

What is starch made of?

Answer 9

sugar

Question 10

Using a benedict’s solution will turn ………if ……… is present

Answer 10

from blue to green/orange/red if sugar is present

Question 11

Using an iodine solution will turn ……… if ……… is present

Answer 11

from orange to blue/black if starch is present

Question 12

How do you test for sugar ?

Answer 12

• Food should be put into a test-tube
  and covered with Benedict’s solution.
  -The tube should be heated for 5 minutes in a water bath.
  -If there is sugar present, the solution will turn from blue to brick
  red/ orange-red.
  -If there is no sugar, it will stay blue.

Question 13

How do you test for starch

Answer 13

-Add a few drops of iodine to the food in a spotting tile or test tube.
-If there is starch in the food, the iodine will turn from orange brown to blue-black.
-If there is no starch, the iodine will stay orange.