MCDB 1150 Test 1 with complete solutions

MCDB 1150 Test 1




Covalent bonding - Correct Answers -bonding between atoms by sharing electrons




electronegativity - Correct Answers -A measure of how tightly an atom holds its




electrons (closeness to the nucleus)

What qualities of an atom make it more electronegative - Correct Answers -1) more
protons (more positive charge in the nucleus); 2) fewer electron shells (closer to the
nucleus)

Put the following atoms in order of decreasing electronegativity: H, C, O, N, F - Correct
Answers -F>O>N>C=H

Which is more electronegative, F or Cs? - Correct Answers -F since it has fewer
electron shells

, Polar covalent bonds - Correct Answers -bonds between atoms of different
electronegativity. The more electronegative atom will hold the electron closer to it than
the other. Examples are O-H, N-H, F-H, C-O, C-N, and F-N bonds




What are the characteristics of molecules that contain polar covalent bonds? - Correct
Answers -They are hydrophilic and polar and chemically reactive.

Nonpolar covalent bonds - Correct Answers -bonds between atoms of same or similar
electronegativity. The electrons are located in the middle of the two. Examples are H-H




bond and C-H bond

What are the characteristics of molecules that contain nonpolar covalent bonds? -
Correct Answers -They are hydrophobic, nonpolar, and chemically inert (nonreactive).

Dipole - Correct Answers -partial charge on a molecule