Chap 3: Food

Question 1

Test for starch

Answer 1

Iodine
Heat is needed
Original colour: brick red
Final colour : blue/ black

Question 2

Simple sugar test

Answer 2

Benedicts solution
Heat needed
Original colour: blue
Final colour: Red

Question 3

Test for fat

Answer 3

Brown paper
Heat not needed
Original: no stain
Final: translucent stain

Question 4

Protein

Answer 4

Sodium hydroxide and copper sulphate
Heat is not needed
Original colour: blue
Final colour: purple

Question 5

Benedictus solution tests for:

Answer 5

Simple sugar: but just glucose not sucrose

Question 6

Foods and energy

Answer 6

Fat contains twice the energy of carbohydrates

Protein does not contain energy

Question 7

4 factors affecting energy requirements

Answer 7

Age
Gender
Activity levels
Health

Question 8

Method: to show the conversion of chemical energy, in food, into heat energy

Answer 8

Put a thermometer in water in a test tube,
Place burning cracker underneath
Observe heat of water rising