Group 4 ProjectBella W, Reni O, Fabio T, Julia B, Dimitrios
S, Sarah S, and Thibault L
Biology
Locations
Process
Sample 1Slide Sample: 1.1 Petri Dish Sample 1
Stagnant water under bridge (8cm)
Sample 2Slide Sample
2.1 2.2
Petri Dish Sample 2
LIght stream of water between the rocks (4cm)
Sample 3Slide Samples: 3.1
3.2
3.3
Petri Dish Sample 3
Moderate stream under fallen tree (7cm)
Sample 44.1
4.2
4.3
Petri Dish Sample 4
Moderate stream in the middle of the creek (23cm)
Sample 66.1
6.2
6.3
Petri Dish Sample 6
Very light stream by rocks (2cm)
Chemistry
Dissolved Oxygen test○ Diffused from surrounding air○ Photosynthesis byproduct○ Used to analyze the ability to support life○ Usually used to assess productivity in the stream,
river, lake
HypothesisSufficient for most aquatic species
○ E.g: Salamanders and crawfish
Process1) Submerge sample bottle2) Add Manganous Sulfate Solution and Alkaline Potassium
Iodine Azide3) Shake and mix to form precipitate4) Add Sulfuric Acid and gently rotate bottle until the solution
has turned yellow5) Measure out 20 mL of the Water Sample Solution6) Use titration plunger on Sodium Thiosulphate until scale
reaches 07) Add Starch Indicator Solution until the solution turns blue8) Use Thiosulphate until fixed sample turns clear and record
amount used (ppm)
Collected Data
Sample Location Oxygen Dissolved (ppm)
1 6.8
2 8.5
3 8.1
4 8.2
5 7.8
6 7.9
Average 7.8
pH Level per LocationSample Locations pH level
1 6.76
2 6.81
3 6.86
4 6.85
5 6.90
6 6.73
Average pH Level 6.81
Conclusions
● Average = 7.8 ppm● Within 7-8 range (sufficient for life)● Explains animal presence in stream● pH marginally more acidic, but still basic (6.81)
Evaluation
● Only one trial (lack of time)● Did not wait for clumps in “fixed” solution● First trial (closest to source of the stream)
has lowest ppm
Physics
Procedure
● Began at rocks downstream● 3.5g cork ● Set downstream ● Pre-approximated course measured with meter stick● Pick up points 8-10 meters
DataTime (+/-.5s)
Distance (+/-.2m) Trial 1 Trial 2 Trial 3 Averages (approx.) (+/-.5)
8 43 35 30 36
16 62 63 74 67
26 213 212 223 206
36 225 120 125 123
46 99 111 111 107
Approximated Speed at Each Leg
Distance (+/-.2m) Speed (cm/s)
8 22.2 +/-1.0
16 11.9 +/- 0.5
26 4.6 +/- 0.1
36 8.1 +/- 0.2
46 9.3 +/- 0.3
Projected Data
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