chem o 10

1.

1 point

Organisms that use Ca2+ and CO32- to build CaCO3 hard part

Decreases DIC and increase Ac

Increases DIC but decrease Ac

Decreases both DIC and Ac

Increases both DIC and Ac

2.

1 point

Which deep ovean is most acidic

S Atlantic

S Pacific

N Atlantic

N Pacific

3.

1 point

carbonate ion concentration can be calculated from the following relationship

2Ac – DIC

2DIC – Ac

Ac – DIC

4.

1 point

Which is true for organic matter degradation

Organic matter degradation decreases both [CO32-] and [HCO3-]

Organic matter degradation increases both [CO32-] and [HCO3-]

Organic matter degradation increases [CO32-] but [HCO3-] remains unchanged

Organic matter degradation decreases [CO32-] but increases [HCO3-]

5.

1 point

An increased CaCO3 preservation on sea floor will cause seawater pH to

remain constant

increase

decrease

6.

1 point

which is true for DIC

DIC decreases with increasing depth but increase along deep water flow path

DIC increases with increasing depth but decrease along deep water flow path

DIC increases with increasing depth and along depth water flow path

DIC decreases with increasing depth and along deep water flow path

7.

1 point

Which of the following statements is true in the upper 1000 m of the water column?

DIC increases with depth whereas Ac decreases with depth

DIC decreases with depth whereas Ac increases with depth

Both DIC and Ac increase with depth

Both DIC and Ac decrease with depth

8.

1 point

Carbonate Alkalinity Ac equals

[HCO3-] + 2[CO32-]

∑[cations in eq/kg] -∑[anions in eq/kg]

∑[major cations in eq/kg] -∑[major anions in eq/kg] except HCO3-

[HCO3-] + 2[CO32-] + [B(OH)4-]

9.

1 point

which is true for organic matter degradation

decreases DIC and increases Ac

Increases DIC but decreases Ac

decreases both DIC and Ac

Increase both DIC and Ac

10.

1 point

Which is true for carbonate alkalinity Ac

Ac decreases with increasing depth and along deep water flow path

Ac increases with increasing depth but decrease along deep water flow path

Ac increases with increasing depth and along depth water flow path

Ac decreases with increasing depth but increase along deep water flow path

11.

1 point

Which is true for CaCO3 dissolution

decreases both DIC and Ac

decreases DIC and increase Ac

increases DIC but decrease Ac

increases both DIC and Ac

12.

1 point

total alkalinity equals

[HCO3-] + 2[CO32-]

[HCO3-] + 2[CO32-] + [B(OH)4-]

∑[cations in eq/kg] -∑[anions in eq/kg]

∑[major cations in eq/kg] -∑[major anions in eq/kg] except HCO3-

13.

1 point

Bicarbonate ion concentration can be calculated fromt eh following relationship

Ac – DIC

2Ac – DIC

2DIC – Ac

14.

1 point

Which of the following statements is true for CaCO3 dissolution?

increases both [CO32-] and [HCO3-]

decreases [CO32-] but [HCO3-] remains unchanged

increases [CO32-] but [HCO3-] remains unchanged

increases [CO32-] but decrease [HCO3-]

decreases both [CO32-] and [HCO3-]

decreases [CO32-] but increase [HCO3-]

15.

1 point

Mean ocean alkalinity is controlled by:

Riverine input of major cations to the ocean

ratio of A to B

Loss of major cations by CaCO3 deposition, hydrothermal and reverse weathering

16.

1 point

what parameters have to be measured in order to calculate seawater pH

carbonate alkalinity

PCO2

DIC

any two parameters above

17.

1 point

An enhanced weathering on land and the subsequent increased river input of dissolved cations Me in form of Me2(HCO3)n, where n is the charge of the cation, to the ocean will:

Increase CaCO3 preservation on the seafloor

Increase mean ocean alkalinity

Decrease CaCO3 preservation on the seafloor

Decrease mean ocean alkalinity

18.

1 point

Deep water pH is controlled by

CaCO3 dissolution

ratio of A to B

organic matter degradation

19.

1 point

An increase in the ratio of organic matter to CaCO3 falling from the surface to deep ocean due to changes in ocean ecology, will cause

More CaCO3 is preserved on the sea floor

More CaCO3 on the sea floor to dissolves

CaCO3 on the sea floor remain unchanged

20.

1 point

Which of the following statements is true for biological uptake of nitrate in the surface ocean?

decreases both DIC and Ac

increases both DIC and Ac

decreases DIC and increase Ac

increases DIC but decrease Ac