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Free CLEP Science and Mathematics Exam Braindumps (page: 50)

Page 49 of 128
PDF with 494 Questions

A common rule when preparing acidic solutions is to always add acid to water. Which of the following is not a reason for this rule?

  1. Mixing strong acids with water produces a large amount of heat.
  2. Mixing strong acids with water causes rapid cooling.
  3. Adding water to acid could result in splashing concentrated acid.
  4. Adding acid to water initially produces a very dilute solution.
  5. There is no reason to add acid to water instead of adding water to acid.

Answer(s): B

Explanation:

Dissolving acid in water is an exothermic process.



Almost all of the earth's weather occurs in the

  1. thermosphere
  2. mesosphere
  3. troposphere
  4. stratosphere
  5. exosphere

Answer(s): C

Explanation:

The troposphere extends from the surface of the earth to 5-9 miles high. This is where weather occurs.



The most abundant component of the earth's atmosphere is

  1. oxygen
  2. nitrogen
  3. argon
  4. water
  5. ozone

Answer(s): B

Explanation:

The two major components of the atmosphere are nitrogen (78%) and oxygen (21%).



The burning of fossil fuels is thought to increase the possibility of global warming. When fossil fuels undergo a combustion reaction the by-products are carbon dioxide and water. Carbon dioxide contributes to the greenhouse effect by which of the following mechanisms?

  1. Carbon dioxide absorbs short wavelengths and allows infrared radiation to escape.
  2. Carbon dioxide absorbs infrared wavelengths and allows other wavelengths to escape.
  3. All wavelengths of electromagnetic radiation are absorbed by carbon dioxide.
  4. Carbon dioxide increases the temperature of the ocean.
  5. Carbon dioxide does not have any effect.

Answer(s): B

Explanation:

Heated objects emit long-wavelength, infrared radiation. Carbon dioxide is able to absorb radiation of this wavelength. An increase in carbon dioxide in the atmosphere will result in more infrared radiation being trapped in the atmosphere with the result of an increase in temperature.






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