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Question
Why isn't distillation used commercially to purify water?A) Water requires large amounts of energy to boil affordably.
B) Bacteria are not killed during the distillation process.
C) Odd smelling contaminants boil at lower temperatures than water and so are impossible to remove.
D) Distillation does not remove suspended particles such as dirt and humus.
E) none of the above
Answer
This answer is hidden. It contains 1 characters.
Related questions
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Heat energy is measured in units of
A) degrees.
B) joules.
C) calories.
D) both joules and calories.
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When the temperature of a fixed volume of air initially at 0 C is lowered by 1 degree, its pressure
A) decreases by 1/273.
B) decreases by 100/273.
C) increases by 1/273.
D) increases by 100/273.
Q:
Which of these is the smallest?
A) 1 Celsius degree
B) 1 kelvin
C) 1 Fahrenheit degree
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B) potential energy.
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If water had a lower specific heat capacity, would ponds and lakes be more or less likely to freeze in winter?
Q:
Distinguish between the concepts of thermal energy, temperature, and heat.
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A) surface of bodies of water.
B) layer of water slightly below the surface.
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Water at 4C will expand when it is slightly
A) cooled.
B) warmed.
C) both of these
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If water at 0C slightly increases in temperature, the water
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If water at 20C slightly increases in temperature, the water
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Q:
The operation of a bimetallic strip relies on differences in
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Q:
A kg of 40C water and a kg of 20C water, after being mixed, have a temperature of 30C. However, the final temperature of a 1-kg iron block at 40C placed into 1 kg of water at 20C is
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The moderate temperatures of islands throughout the world has mainly to do with water's
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A) becomes more ordered.
B) becomes less ordered.
C) reaches equilibrium.
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Q:
When work is done by a system and heat is subtracted, the temperature of the system
A) increases.
B) decreases.
C) remains unchanged.
Q:
Which law of thermodynamics addresses the direction of heat flow?
A) First law
B) Second law
C) Third law
D) all of the above
Q:
Which law of thermodynamics states that no system can reach absolute zero?
A) First law
B) Second law
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Q:
At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is
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Q:
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A) less the gravitational force between them.
B) more the gravitational force between them.
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Q:
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A) one-quarter.
B) half as much.
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If Earth's mass somehow decreased with no change in its radius, your weight would
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B) increase.
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Q:
Newton discovered
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C) neither of these
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A) go into circular orbit about Earth.
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B) farthest from the Earth.
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C) neither of these
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From Earth, one satellite appears to overtake another. The faster satellite that is seen to overtake the other is
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B) lower.
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E) none of the above