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24-09-2019

Product code Chemistry-Quizlet966

1Q-Lead-210 with a half-life of 22 years cannot be used to determine the sedimentation of deep-ocean sediments because:
W)its half-life is too short
X) its half-life is too long
Y) its concentration in these sediments is too high to measure
Z) its concentration in these sediments is too low to measure

2Q-How is organic matter produced in the ocean classified?
W)Allochthnonous
X) Autochthonous
Y) Terrigenous
Z) Hydrogenous

3Q-What type of reaction is cellular respiration considered?
W)Endothermic
X) Catalytic
Y) Inorganic
Z) Exothermic

4Q-What is the average salinity of the world's oceans?
W)10
X) 25
Y) 35
Z) 50

5Q-Which type of heat changes the state of a substance, but does not raise its temperature?
W) Transforming heat 
X) Sensible heat
Y) Latent heat
Z) Converting heat

6Q-How does increasing atmospheric pressure affect the boiling point of water?
W)The boiling point decreases
X) The boiling point does not change
Y) The boiling point increases 
Z) Water does not boil at higher pressures

7Q-Generally, what are conservative elements in seawater?
W) Major components
X) Minor components
Y) Easily dissolved 
Z) Used in photosynthetic activity

8Q-What does the Law of Constancy of Composition state?
W)The relative proportion of ions and their concentrations are virtually constant
X) The relative proportions of ions are virtually constant, but their concentrations may vary
Y) Changes in salinity will result in changes in the ionic concentration
Z) Ionic concentrations remain fairly constant regardless of the local environmental conditions

9Q-What is the salinity range where you would find the turbidity maximum in an estuary?
W)1 to 5 ppm
X) 5 to 15 ppm
Y) 15 to ppm
Z) 25 to 35 ppm

10Q-In methane hydrates, what traps the methane gas?
W)Carbon dioxide
X) Water
Y) Argon 
Z) Oxygen

11Q-What does a chemical equation with a negative delta G indicate?
W)Releasing energy and not spontaneous
X) Endothermic and spontaneous
Y) Exothermic and may be spontaneous
Z) Using energy and not spontaneous

12Q-Which three factors are responsible for hypoxic zones in the northern Gulf of Mexico?
W)Pesticide-laden runoff, high winds, and strong currents 
X) Coastal erosion, sedimentation, and spring overturn
Y) High river runoff, vertical stratification, and high biological oxygen demand
Z) Vessel sewage discharges, nutrient elevation, and upwelling

13Q-Which of the following primarily causes the variation in the salinity of seawater?
W)Carbon dioxide
X) Sodium ions
Y) Chloride ions
Z) Water molecules

14Q-What is the most abundant excess volatile on Earth?
W)Carbon dioxide
X) Water Vapor
Y) Chlorine
Z) Nitrogen

15Q-Which two molecules increase in concentration in deep water as it travels from the North Atlantic to the North Pacific ocean?
W)Oxygen and nitrate
X) Nitrate and carbon dioxide 
Y) Oxygen and carbon dioxide
Z) Carbon dioxide and carbon-14

16Q-What environmentally harmful isotope was produced during the 1954 'Bravo' thermonuclear detonation at Bikini Atoll?
W)Uranium 238
X) Nitrogen-15
Y) Cesium 137
Z) Carbon14

17Q-Why are chelators important to marine organisms?
W) They absorb sunlight
X) They bind trace metals
Y) They prevent sinking
Z) They enhance feeding

18Q-How many years does it take for an amount of water equal to the entire volume of the ocean to cycle through hydrothermal vents?
W)1000 years
X) 100,000 years
Y) 10 million years
Z) 1 billion years

 

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1Q-Lead-210 with a half-life of 22 years cannot be used to determine the sedimentation of deep-ocean sediments because: W)its half-life is too short X) its half-life is too long Y) its concentration in these sediments is too high to measure Z) its concentration in these sediments is too low to measure 1A-W

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