What affects the residence time of an element? a. Its saturation ...

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What affects the residence time of an element?
  a. Its saturation level
  b. Its chemical equilibrium in water
  c. Its chemical activity in water
  d. The principle of constant proportions

Question 2

Which element would be surprisingly considered a trace element in the ocean despite its abundance in
  the atmosphere?
  a. Sodium
  b. Calcium
  c. Chloride
  d. Nitrogen

[qytan]

Answer to Question 1

ANS: C
The residence time of an element is individual. Some elements remain in seawater for short periods of
time before becoming bound in sediments. Chemical activity of the element effects its residence time.
Information can be found in the section Seawater Consists of Water and Dissolved Solids.

Answer to Question 2

ANS: D
Nitrogen is a trace element in the ocean despite its abundance in the atmosphere. Any element that is
less than 1 part per million is considered a trace element. Although trace elements are such small
quantities, they are often crucial to life processes. Information can be found in the section Seawater
Consists of Water and Dissolved Solids

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TYSM

[Sarahjh]

Thanks for the timely response, appreciate it