|
QUESTIONS
-
What happened to the appearance of the exposed apple
surface without Vitamin C? (it turned brown)
- What
caused this change? (oxidation)
- From
where did this oxygen come from? (the atmosphere)
- Identify
the substance that was "painted" onto the exposed apple
surface. (aqueous solution of vitamin C)
- Did
the vitamin C covering affect oxidation? (yes) How could
you tell? (the exposed surface did not brown)
POOLING
RESULTS
Pool the class results. Then, find the average time for a
slice of apple to brown. Did your apple brown before or after
the class average time? What might account for differences
in the rate? (accept all reasonable answers such as different
cut depths, different amounts of exposed surface)
CURRICULUM
LINKS
| Chemistry:
|
|
Chemical Reactions, Chemical
Kinetics |
|
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 |
|
Students should develop and understanding transformations
of energy |
 Back
to Teaching Guide
|
