Science Question 2

The following table represents the concentration of ions and dissolved gases in the sediment at the bottom of an ocean. A depth of 0 centimeters (cm) represents the top of the sediment. The concentrations are expressed in parts per million (ppm). The acidity of a solution is represented on a scale known as pH. A pH of 1 is very acidic, a pH of 7 is neutral, and a pH of 14 is very basic.

                                                                                           

Depth
(cm)

Temperature
(oC)

pH

Concentration in sediment (ppm)

SO42–

S2–

CO2

Fe3+

Fe2+

O2

 0

 4

7.0

7.0

0.0

1.0

4.0

0.5

2.0

 5

 5

6.5

5.0

2.0

1.5

3.0

1.5

1.0

10

 7

6.0

3.5

3.5

2.0

2.0

2.0

0.0

15

 9

5.5

3.3

3.8

3.0

0.8

3.8

0.0

20

10

5.0

3.0

4.0

1.0

0.5

4.0

0.0

 

The graph to the left best represents the relationship between concentration and sediment depth for which of the following ions and dissolved gases?

F. Ferrous Iron Fe2+

G.  Oxygen  O2

H.  Carbon dioxide (CO2)

J.  Sulfate (SO42–)

 

 
Answer and Explanation

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