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