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Free CLEP Science and Mathematics Exam Braindumps (page: 43)

Page 42 of 128
PDF with 494 Questions

Which of the following elements is the most electronegative?

  1. Be
  2. B
  3. C
  4. N
  5. O

Answer(s): E

Explanation:

For elements with the same principal quantum number, electronegativity increases from left to right across the periodic table



The third law of thermodynamics, also known as the law of entropy states

  1. energy is neither created nor destroyed.
  2. systems tend to increase in disorder.
  3. systems prefer to exist in their lowest energy state.
  4. systems prefer to exist in their highest energy state.
  5. systems tend to decrease in disorder.

Answer(s): B



Determine H (in kJ) for the reaction H2O + Cl2 1/2O2 + 2HCl, given the following information.

(i) H2O H2 + 1/2O2 H = +286 kJ

(ii) H2 + Cl2 2HCl H = -185 kJ

  1. +84 kJ
  2. +101 kJ
  3. +391 kJ
  4. -391 kJ
  5. -101 kJ

Answer(s): B

Explanation:

Summing the reactions given results in the reaction in question. To determine H for the reaction given, simply sum the H of reaction (i) and reaction (ii).





The thermometer reads

  1. 19.6°C
  2. 19.50°C
  3. 19.5°C
  4. 19.4°C
  5. 19.40°C

Answer(s): E

Explanation:

The temperature should be read from the bottom of the meniscus. The temperature to the tenths place can be read, and the hundredths place should be estimated to have the correct number of significant figures.






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