|
QUESTIONS
- What
did the Benedict's solution test for? (the presence of simple
reducing sugars)
- How
did the presence of a reducing sugar affect the Benedict's
solution? (the Benedict's solution underwent a color change)
- What
color would the Benedict's display if there was no sugar
in the solution? (It would remain blue)
- What
color would the Benedict's display if it tested a sugar
(sucrose) solution? (the blue color wouldn't change since
sucrose isn't a simple reducing sugar)
- Did
these juices contain reducing sugars? How could you tell?
(yes - the indicator solution underwent a color change when
heated)
- Which
juice underwent the most dramatic color shift? Why? (apple
juice - it had the highest concentration of sugar)
- Which
juice underwent the least change in color? Why? (lime juice
- it had the lowest concentration of sugar)
A
SWEET MATH CONNECTION
This
scale illustrates the relative sweetness of several sugars
based upon
sucrose = 100
Lactose (complex sugar) = 16
Galactos (simple sugar) =32
Sucrose (complex sugar) =100
Fructose (simple sugar) =173
Using
this scale, answer the following questions:
QUESTIONS
- Which
is the sweetest of these four sugars? (fructose)
- How
many times sweeter is sucrose than lactose? (6.25 times
sweeter)
- How
many grams of fructose would be needed to replace 10 grams
of sucrose in order to produce the same sweetness? (1000/173
= 5.8 grams)
- Suppose
a recipe calls for 5 grams of sucrose to sweeten a dish.
How much lactose would be needed if you substituted sugars?
(31.25 grams)
- If
a diabetic has a low blood sugar level, that person may
drink orange juice. Orange juice contains a high concentration
of sugar that is readily used by the body. In contrast,
some foods contain sugars that must be broken down before
they can be used. These slow-release sugars may offer a
diabetic a window in which a compromised insulin response
has sufficient time to deal with the slowly rising sugar
level. Think about it. Should a diabetic who is suffering
from low sugar levels be given a food containing a slow-release
sugar? (no) Explain. (The slow release will not offer an
immediate source of sugar to patient)
CURRICULUM
LINKS
| Chemistry:
|
| Chemical
Reactions, Biochemistry, Indicators |
| Mathematics:
|
| Ratios,
Data Analysis |
| Biology:
|
| Health,
Nutrition |
|
NATIONAL
SCIENCE STANDARDS (Grades
5-8)
| Science
As Inquiry-Content Standard A |
| Students
should develop abilities necessary to do scientific inquiry, |
|
Students should develop an understanding about scientific
inquiry |
| Physical
Science -Content Standard B |
|
Students should develop and understanding of the
properties and changes of properties in matter |
|
Student should develop an understanding about transfer
of energy |
| Life
Science -Content Standard C |
|
Student should develop an understanding about structure
and function in living systems |
| Science
in Personal and Social Perspectives -Content Standard
F |
|
Student should develop an understanding about personal
health |
 Back
to Teaching Guide
|
