ALEX AND BRIAN,
Group Results for samples tested using 3 tests
| |
IKI |
BIURET |
BENEDICT |
| PROTEIN |
negative |
positive |
negative |
| STARCH |
positive |
negative |
positive |
| DEXTROSE |
negative |
negative |
positive |
My Results for bag weights before and after 24 hours in the cup
| (weights in grams) |
WEIGHT BEFORE |
WEIGHT AFTER |
|
STARCH BAG
IN H2O
|
17.29 |
17.14 |
|
H2O BAG
IN
STARCH
|
7.32 |
7.40 |
|
H2O BAG
IN PROTEIN
|
4.64 |
4.80 |
|
H2O BAG
IN DEXTROSE
|
5.60 |
5.47 |
Conclusions:
-More starch went into and out of the bag than water went out of and into the bag.
-More protein entered the bag than water left.
-More water left the bag than dextrose entered.
JAKE, SARAH, EMILY, AND ELISE,
|
Beaker filled with:
|
Bag:
|
Mass of Bag Before
(grams)
|
Mass of Bag After
(grams)
|
|
Water
|
Simple Sugar
|
21.24
|
21.26
|
|
Water
|
Starch
|
5.73
|
5.49
|
|
Water
|
Protein
|
14.09
|
14.26
|
|
Simple Sugar
|
Water
|
21.16
|
10.14
|
|
Starch
|
Water
|
18.82
|
17.21
|
|
Protein
|
Water
|
19.45
|
18.76
|
Observations:
- most bags in water have masses that go up
-water got into bags making the mass go up
-except for the bag of starch whose mass went down; the starch escaped from the bag
- all of the bags OF water lost mass overnight
ADRIENNE AND MICHAELA:
Initial testing of each solution...
| |
IKI |
Benedict |
Biuret |
| Protein |
negative |
negative |
positive |
| Starch |
positive |
negative |
negative |
| Simple Sugar |
negative |
positive |
negative |
Weights of Bags - Substance in Bag, Water in Cup ...
| |
Day 1 Weight of Bag
(grams)
|
Day 2 Weight of Bag
(grams)
|
| Protein |
8.70 |
9.26 |
| Starch |
11.20 |
11.85 |
| Simple Sugar |
10.10 |
9.64 |
Weights of Bags - Water in Bag, Substance in Cup ...
| |
Day 1 Weight of Bag
(grams)
|
Day 2 Weight of Bag
(grams)
|
| Protein |
7.50 |
8.06 |
| Starch |
14.30 |
15.35 |
| Simple Sugar |
5.90 |
6.00 |
Test of end solutions
|
Starch
IKI
Benedict
Biuret
|
In bag...
negative
|
In cup...
positive
|
|
Protein
IKI
Benedict
Biuret
|
In bag...
negative
|
In cup...
positive
|
|
Simple Sugar
IKI
Benedict
Biuret
|
In bag...
positive
|
In cup...
positive
|
What Happened: Ideas
- Starch didn't leak into water, but water had to have leaked into the bag (weight increase)
-Protein didn't leak into water, but water had to have leaked into the bag (weight increase)
-Simple Sugar leaked into water (water tested positive for Benedict; weight decrease), and water had to have leaked into the bag (weight increase)
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