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HOW
DO WE KNOW WHICH NUTRIENTS ARE
PRESENT IN FOOD?
THERE ARE CHEMICAL TESTS
DESIGNED TO DETECT THE PRESENCE
OF KEY NUTRIENTS.
| TEST
|
NUTRIENT
TESTED |
HOW
THE TEST
IS DONE |
POSITIVE
RESULTS |
|
BENEDICT'S
SUGAR
TEST
SEE PICTURES
AT:
|
SIMPLE
SUGAR |
- ADD
3
TO
5
DROPS
OF
BENEDICT'S
SOLUTION
TO
A
TEST
TUBE
CONTAINING
THE
MIXTURE
BEING
TESTED.
- SHAKE
THE
TEST
TUBE
GENTLY.
- PLACE
THE
TEST
TUBE
IN
A
HOT
WATER
BATH
FOR
UP
TO
10
MINUTES.
-
NOTE
THE
COLOR
OF
THE
SOLUTION.
|
THE
SOLUTION
WILL TURN
YELLOW,
ORANGE OR
RED IF THE
SOLUTION
CONTAINS
A SIMPLE
SUGAR. |
|
IODINE
STARCH
TEST
(LUGOL
SOLUTION)
SEE PICTURES
AT:
|
STARCH
(A TYPE
OF CARBOHYDRATE) |
- ADD
3
TO
5
DROPS
OF
IODINE
SOLUTION
(LUGOL
SOLUTION)
TO
THE
SUBSTANCE
BEING
TESTED
FOR
STARCH.
- NOTE
THE
COLOR
OF
THE
SUBSTANCE
|
THE
SAMPLE WILL
SHOW A DARK
GREEN, PURPLE
OR BLACK
COLOR IF
THE SUBSTANCE
CONTAINS
STARCH. |
|
BIURET
PROTEIN
TEST
SEE PICTURES
AT:
READ
MORE
ABOUT
PROTEIN
TESTING
AT:
|
PROTEIN |
- THE
SUBSTANCE
TO
BE
TESTED
SHOULD
BE
IN
SOLUTION
FORM.
-
TO
A
TEST
TUBE
ONE
THIRD
FILLED
WITH
THE
SOLUTION,
ADD
10
DROPS
OF
SODIUM
HYDROXIDE
SOLUTION
(OR
POTASSIUM
HYDROXIDE
SOLUTION).
- SHAKE
THE
TEST
TUBE
THOROUGHLY.
-
ADD
ABOUT
5
TO
9
DROPS
OF
COPPER
SULFATE
SOLUTION,
ONE
DROP
AT
A
TIME,
SHAKING
THE
TEST
TUBE
BETWEEN
DROPS.
-
QUIT
ADDING
THE
COPPER
SULFATE
SOLUTION
AFTER
A
COLOR
CHANGE
IS
SEEN.
- NOTE
THE
FINAL
COLOR.
|
THE
SOLUTION
TURNS A
PURPLE COLOR
IF LONG
CHAIN PROTEINS
ARE PRESENT;
IF SHORT
CHAIN PROTEINS
ARE PRESENT
THE SOLUTION
WILL TURN
PINK. A
CLOUDY BLUE
COLOR INDICATES
THAT NO
PROTEIN
IS PRESENT. |
|
LIPID
TEST
READ
ABOUT
THE
LIPID
TEST
AT:
|
LIPID
OR FAT |
- PUT
A
SMALL
AMOUNT
OF
A
SUBSTANCE
ON
NEWSPRINT
PAPER
- NOTE
THE
TRANSLUCENCE
OF
THE
SUBSTANCE
|
SUBSTANCES
THAT CONTAIN
THE MOST
FAT WILL
SHOW THE
MOST TRANSLUCENCE |
IF YOU WANT OR NEED TO
LEARN MORE ABOUT THESE CHEMICAL
TESTS, CHECK OUT ONE OR ALL
OF THESE SITES:
- SITE
A: SELECT THE
TEST YOU ARE INTERESTED
IN AT THE NATIONAL
SCIENCE TEACHERS ASSOCIATION
- SITE
B: SELECT THE
TEST FROM THE LIST
OF CHEMICAL TESTS
FOR ORGANIC COMPOUNDS
- SITE
C: MOLECULES OF
LIFE REVIEW SHEET
- SITE
D: BIOLOGICAL
MOLECULES
ACTIVITY
CHOICE 1:
DO THE EXPERIMENT ACTIVITY
ENTITLED "TESTING FOR NUTRIENTS"
FOUND ON PAGE 329 OF YOUR CHEMICALS
IN ACTION TEXTBOOK. ANSWER
THE QUESTIONS THAT FOLLOW THE
EXPERIMENT. COMPARE YOUR EXPERIMENT
RESULTS AND QUESTION ANSWERS
WITH THOSE OF A CLASSMATE. IF
IN DOUBT OF AN INTENDED RESULT,
CONTACT YOUR TEACHER.
DO THE EXPERIMENT ACTIVITY
ENTITLED "WHAT'S IN IT?"
FOUND ON PAGE 330 OF YOUR CHEMICALS
IN ACTION TEXTBOOK. ANSWER
THE QUESTIONS THAT FOLLOW THE
EXPERIMENT. COMPARE YOUR EXPERIMENT
RESULTS AND QUESTION ANSWERS
WITH THOSE OF A CLASSMATE. IF
IN DOUBT OF AN INTENDED RESULT,
CONTACT YOUR TEACHER.
CHOICE 2:
VISIT THE SITES BELOW.
EACH SITE GIVES INSTRUCTIONS
FOR AN EXPERIMENT. DO AT LEAST
ONE OF THE EXPERIMENTS.
ASSIGNMENT
ANSWER THE QUESTIONS IN
THE ATTACHED ASSIGNMENT. KEEP
NOTE OF HOW WELL YOU DO ON THE
QUESTIONS.
DO
ASSIGNMENT
ASSESSMENT
SELF ASSESSMENT: DID YOU
DO WELL ENOUGH ON THE ASSIGNMENT
QUESTIONS? IF NOT, READ THE
SITES ABOUT TESTING FOR NUTRIENTS
AGAIN. MAKE SHORT POINT FORM
NOTES ABOUT THESE TESTS. TRY
THE ASSIGNMENT QUESTIONS AGAIN.
YOUR UNIT TEST WILL CONTAIN
QUESTIONS SIMILAR TO THOSE FOUND
IN THE ASSIGNMENT FOR THIS LESSON.
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