organic compounds quiz

What are the possible results when this test is conducted (Benedict’s test)?

red, yellow, orange, green, blue, brown

result for positive benidicts test

red, orange, yellow, green, brown

result for negative benidicts test

blue

What are the three categories of carbohydrates

monosaccharides, disaccharides, and polysaccharides

example of monosaccharides

glucose and fructose

example of disaccharides

sucrose and lactose

examples of polysaccharides

starch and cellulose

Which of these does the Benedict's test detect?

reducing sugars

If you conducted this test on some protein powder, what would you expect the results to be? (Benedicts test)

negative because it’s ,made up of proteins and not sugars

what is the iodine test used for 

test for startch

how is the test conducted (iodine test)

drops of IKI is added to a sample

positive for iodine

black/purple

negative for idione

yellowish- brown

If you conducted this test on a piece of corn tortilla, what would you predict the results to be? (iodine test)

it would be positive because it contains starch

Which chemical test is used to detect lipids? 

sudan test

examples of lipids

wax, fats, oils

how is Sudan test conducted

by mixing Sudan IV dye with each sample

How does molecule polarity fit into this test (Sudan test)

because it’s non polar so it won’t dissolve in polar substances

How are positive results distinguished from negative results using this test? (Sudan test)

positive: the dye would mix in; negative: the dye would float

If you conducted this test on some Gatorade (or other sports drink), what would you predict the results to be? (Sudan test)

negative because it would not contain ant lipids

What is the Biuret Test used for?

to test for proteins

how is the test conducted (biuret test)

by adding 15% sodium hydroxide and copper sulfate

postive for biuret test 

violet color

negative for biuret test

blue color

If you conducted this test on a glucose solution, what would you predict the results to be? (biuret test)

it would be negative because glucose is sugar

 If you conducted this test on some chicken broth, what would you predict the results to be? (biuret test)

it would be positive because chicken has protein