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Answered: - Earth Science Teacher Graded Assignment appreciate any hel


Earth Science Teacher Graded Assignment appreciate any help i can get?


Graded Assignment

 


 

SCI113B: Earth Science | Unit 3 | Lessons 5 and 6: Laboratory: Dissolved Oxygen

 


 

Name:

 


 

Date:

 


 

Graded Assignment

 

Lab Report

 

Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for

 

full credit.

 

Record the number of drops of Reagent D needed to turn the solution light blue in each phase of the lab:

 


 

Set-Up Observations

 

Phase

 


 

Amount of water

 

mL or drops

 


 

Amount of yeast

 


 

1

 


 

6 mL

 


 

0.25mL

 


 

2

 


 

6 mL

 


 

0.25mL

 


 

3

 


 

6 mL

 


 

0.25mL

 


 

(12 points)

 


 

1.

 


 

Complete the data table.

 


 

Score

 


 

Answer:

 


 

Experiment Observations

 

Phase 1

 


 

Phase 2

 


 

Phase 3

 


 

O2 concentration in

 

ppm (parts per

 

million) = number of

 

drops of Reagent D

 

added to reach blue

 

color (oxygen

 

completely depleted)

 

and observations

 

(3 points)

 


 

2.

 


 

Regarding Phases 2 or 3 of the experiment, if more or fewer drops of Reagent D

 

(sodium hydroxide) were needed to get the same blue color as in Phase 1, what does this

 

tell us about the quality of the water when yeast was consuming nutrients in the water? Did

 

something similar to eutrophication occur?

 


 

Score

 


 

Answer:

 


 

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Copying or distributing without K12?s written consent is prohibited.

 


 

Page 1 of 3

 


 

Graded Assignment

 


 

SCI113B: Earth Science | Unit 3 | Lessons 5 and 6: Laboratory: Dissolved Oxygen

 


 

(3 points)

 


 

3.

 


 

What would happen to the dissolved oxygen in the Missouri River if large amounts of

 

waste were dumped into it?

 


 

Score

 


 

Answer:

 


 

(3 points)

 


 

4.

 


 

Under favorable conditions, bacteria can multiply every 20 minutes. Starting with one

 

bacteria cell, how many bacteria should you expect after 15 hours? Hint: Under favorable

 

conditions, if one bacterium becomes 2 in 20 minutes (1 multiplied by 2), those 2 become 4

 

in the next 20 minutes, and then those 4 become 8 in the next 20 minutes. That means that

 

8 bacteria resulted in 1 hour. Now calculate the growth of bacteria for 15 hours.

 


 

Score

 


 

Answer:

 


 

(3 points)

 


 

5.

 


 

In this lab, you continued to add Reagent D to each solution until it turned blue. The

 

purpose was to remove the oxygen to measure how much was left. The more drops you had

 

to add to acquire the blue color, the more oxygen was present in the tube. In which phase(s)

 

did the solution turn blue before you added Reagent D? What do you think that means?

 


 

Score

 


 

Answer:

 


 

? 2007 K12 Inc. All rights reserved.

 

Copying or distributing without K12?s written consent is prohibited.

 


 

Page 2 of 3

 


 

Graded Assignment

 


 

SCI113B: Earth Science | Unit 3 | Lessons 5 and 6: Laboratory: Dissolved Oxygen

 


 

Further Uses

 

(3 points)

 


 

6.

 


 

Now that you?ve seen how decomposition affects the amount of dissolved oxygen,

 

collect three samples from somewhere in your house or community. You can get water from

 

a puddle, a drinking fountain, a stagnant bowl of pet water, a stream, a pond, or fresh

 

rainwater?be creative. Then, see how much dissolved oxygen you find in the sample.

 


 

Score

 


 

Answer:

 


 

Sample

 


 

Location

 


 

Signs of

 

Decomposition

 

(List any visible

 

microorganisms that

 

might indicate

 

decomposition.)

 


 

Prediction for

 

Dissolved

 

Oxygen Level

 


 

Results for

 

Dissolved

 

Oxygen

 


 

Your Conclusion

 

(Would this

 

location support

 

aquatic life?)

 


 

1

 

2

 

3

 


 

Your Score

 


 

? 2007 K12 Inc. All rights reserved.

 

Copying or distributing without K12?s written consent is prohibited.

 


 

___ of 27

 


 

Page 3 of 3

 


 

 


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