QUESTION: 117

Susan is studying air pressure and makes a simple mercury barometer as shown below. She knows that air exerts pressure. More pressure on the surface of the mercury in the bowl will cause the mercury level to rise. Less pressure will cause the mercury to fall. High barometric pressure is often associated with fair weather, and low barometric pressure is associated with rain.
Susan is enjoying a bright, sunny day when she hears a local weather forecaster predict rain for tomorrow.

When Susan checks her barometer tomorrow, which change is she most likely to note?

totally fill the tube
have risen by about 5%
have risen by more than 10%
have fallen
remain unchanged

Answer(s): D

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QUESTION: 118

Temperature affects how well gases and solids dissolve to form solutions. Gas solubility increases with decreasing temperature. Cold water can hold more oxygen than warm water.
Fish require dissolved oxygen in the water for respiration. During the hot summer, Allan goes fishing at a nearby lake.
Based on the information, which statement indicates where and why Allan would find the most fish?

shady areas because there is less dissolved oxygen gas in cool water
sunny areas because there is no dissolved oxygen gas in warm water
shady areas because there is more dissolved oxygen gas in cool water
sunny areas because there is more dissolved oxygen gas in warm water
both shady and sunny areas because the amount of dissolved oxygen gas in water is not changed by temperature

Answer(s): C

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QUESTION: 119

Nitrites are used by the meat-packing industry to maintain the appetizing red color of cured meats and smoked fish and to protect the consumer from botulism. However, in the acid environment of the stomach, nitrites can combine with amines to form nitrosamines, which are potent carcinogens.
Which behavior is most effective for all urban consumers to minimize exposure to nitrosamines?

Eat meats such as canned hams and bacon.
Increase the consumption of fresh vegetables.
Eat only at fast food restaurants.
Limit the amount of cured meats and smoked fish consumed.
Take large doses of antacids after eating cured meats and smoked fish.

Answer(s): D

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QUESTION: 120

Absorption is a process by which substances take in matter. During absorption, the matter becomes dispersed throughout the absorbing material.
Which is an example of absorption?

ice freezing in a tray
a candle burning
margarine melting in a frying pan
writing on paper with a lead pencil
water held in a sponge

Answer(s): E

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QUESTION: 117

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QUESTION: 120