What forces of molecular attraction is weakest? a. dipole interaction b. dispersion c. hydrogen bond d. single covalent bond

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1.  Which of the following elements can form diatomic molecules held together by triple covalent bonds?  (1 point)

Unselected answer  (0 pts) carbon

Unselected answer  (0 pts) oxygen

Unselected answer  (0 pts) fluorine

Correct answer  (1 pt) nitrogen

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2.  When H+ forms a bond with H2O to form the hydronium ion H3O+, this bond is called a coordinate covalent bond because ___.  (1 point)

Correct answer  (1 pt) both bonding electrons come from the oxygen atom

Unselected answer  (0 pts) it forms an especially strong bond

Unselected answer  (0 pts) the electrons are equally shared

Unselected answer  (0 pts) the oxygen no longer has eight valence electrons

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3.  What type of bond is most likely to be formed between two fluorine atoms?  (1 point)

Incorrect Answer  (0 pts) an ionic bond

Unselected answer  (1 pt) a nonpolar covalent bond

Unselected answer  (0 pts) a polar covalent bond

Unselected answer  (0 pts) a hydrogen bond

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4.  When placed between oppositely charged metal plates, the region of a water molecule attracted to the negative plate is the .  (1 point)

Correct answer  (1 pt) hydrogen region of the molecule

Unselected answer  (0 pts) geometric center of the moleculec

Unselected answer  (0 pts) H—O—H plane of the molecule

Unselected answer  (0 pts) oxygen region of the molecule

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5.  Which of the forces of molecular attraction is the weakest?  (1 point)

Unselected answer  (0 pts) dipole interaction

Correct answer  (1 pt) dispersion

Unselected answer  (0 pts) hydrogen bond

Unselected answer  (0 pts) single covalent bond

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6.  What causes dipole interactions?  (1 point)

Unselected answer  (0 pts) sharing of electron pairs

Correct answer  (1 pt) attraction between polar molecules

Unselected answer  (0 pts) bonding of a covalently bonded hydrogen to an unshared electron pair

Unselected answer  (0 pts) attraction between ions

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7.  What is required in order to melt a network solid?  (1 point)

Unselected answer  (0 pts) breaking Van der Waals bonds

Unselected answer  (0 pts) breaking ionic bonds

Unselected answer  (0 pts) breaking hydrogen bonds

Correct answer  (1 pt) breaking covalent bonds

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