quiz 21

Question 1

How is a food sample prepared for food testing?

Answer 1

The food sample needs to be crushed,mixed with water and filtered

Question 2

What is the test and result for the presence of protein in a food sample?

Answer 2

Test: add biuret reagent
result: colour changes from blue to lilac if protein is present

Question 3

Explain one safety precaution taken when using ethanol to test for lipids

Answer 3

Avoid open flames as ethanol is flammable

Question 4

What is the test and result for the presence of sugars in a food sample?

Answer 4

Test: add benedicts reagent and boil
result: colour changes from blue to brick-red if glucose is present

Question 5

Explain one safety precaution taken when using iodine solution to test for starch

Answer 5

Weary safety googles as iodine solution is an irritant

Question 6

Explain one safety precaution taken when using benedicts reagent to test for sugar

Answer 6

wear safety googles as benedicts reagent is an irritant

Question 7

Explain one safety precaution taken when using biuret reagent to test for protein

Answer 7

Wear safety googles as biuret reagent is an irritant

Question 8

What is the test and result for the presence of starch in a food sample?

Answer 8

Test: add iodine
result: colour changes from reddish-orange to blue-black if starch is present

Question 9

Name the reagent used to test for sugars in a food sample

Answer 9

Benedicts reagent

Question 10

What is the test and result for the presence of lipids in a food sample?

Answer 10

Test: add ethanol,add water,shake
result: mixture turn cloudy white if lipids are present