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Ch 6 2 Of 3
Test Description: Properties of water, ch 6, 2 of 3
Instructions: Answer all questions to get your test result.
1) Aside from hydrogen and oxygen, the most abundant chemical in seawater is
A
sodium
B
chloride
2) Most marine scientists believe that
A
the oceans are becoming saltier
B
that the oceans are becoming no more or less ssalty
3) the higher the salinity
A
the higher the density
B
the lower the density
4) pH changes with depth because
A
amount of carbon diooxides varies with depth
B
water pressure prevents ions from forming
5) a biogeochmical cycle is
A
the process of elements and compounds moving continuously to and from organisms and the Earth
B
the process of inorganic salts entering and leavinng seawater
6) _____________ is fundamental to all life
A
carbon
B
phosphorous
7) Carbon is fundamental to all life because
A
it provides a versatile foundation for diverse chemicals
B
it reacts with hydrogen to form energy
8) Organisms use nitrogen
A
as an inhaled energy source
B
for the formation of organic compounds such as proteins, chlorphyll and nucleic acids
9) Phosphorous is essential to life because
A
it is an important component of DNA and nucleic acids
B
it combines with nitrogen to form shells
10) Silicone is eimportant to some marine life
A
becaused it used for shells and skeletons in some organisms
B
because it aids in digestion
*select an answer for all questions
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