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Free CLEP Science and Mathematics Exam Braindumps (page: 47)

Page 46 of 128
PDF with 494 Questions

Which of the following molecules is classified as an organic molecule?

  1. NH3
  2. CH2NH2
  3. LiH
  4. H2
  5. Mg(OH)2

Answer(s): B

Explanation:

Organic molecules are compounds containing carbon atoms bonded to hydrogen. Choice (B) is an amine.



Which of the followings has an affect on the value of the equilibrium constant?

  1. Addition of a catalyst
  2. Increasing the volume
  3. Introducing a solid to the reaction
  4. Changing the temperature
  5. Doubling the pressure

Answer(s): D

Explanation:

Changing the temperature is the only thing that will affect the value of an equilibrium constant.



When Berry lium-9 collides with an alpha particle, a neutron and which of the following elements is produced?

  1. 14N7
  2. 13C6
  3. 12C6
  4. 13N6

Answer(s): C

Explanation:

The overall nuclear reaction is:

9Be4 + 4He2 12C6 + 1n0



How many atoms are in 9g of H2O?

  1. 3.01 × 1023
  2. 6.02 × 1023
  3. 12.04 × 1023
  4. 3.01 × 1013
  5. 1.6 × 1024

Answer(s): A

Explanation:

The molecular weight of H2O is 18 g/mol, thus there is 0.5 moles of water. One mole is 6.02 × 1023 atoms, so half of a mole is 3.01 × 1023.






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