A hydrogen bond is: a. a sharing of a pair of electrons ...

[jc611]

A hydrogen bond is:
 
  a. a sharing of a pair of electrons between a hydrogen and an oxygen nucleus
  b. a sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus
  c. a weak attraction between a covalently bonded hydrogen atom and another atom taking part in a separate polar covalent bond
  d. the loss of an electron by hydrogen to a highly electronegative atom
  e. a strong chemical bond between two ions

Question 2

Which of the following supports the idea that the Martian crust is not divided into moving plates like those on Earth? I. the size of Olympus Mons II. the lack of folded mountain chains III. the lack of rift valleys outlining entire plates IV. the presence of dry river beds and sea floors
 
  a. I & II
  b. II & III
  c. II, III & IV
  d. I, II, & III
  e. I, II, III, & IV

[epscape]

Answer to Question 1

c

Answer to Question 2

d
RATIONALE: See page 396 and The History of Mars.