Exam 2 (B)

A  ΔHrxn is the heat of reaction.

B  Endothermic has a positive ΔH.

C  ΔErxn is a measure of heat.

D  Enthalpy is the sum of a system’s internal energy and the product of pressure and volume.

E  An exothermic reaction gives heat off heat to the surroundings.

A  142

B  32.3

C  27.6

D  102

E  35

A  the electron affinity of a fluorine atom

B  an atom absorbs a photon

C  the condensation of water

D  an atom emits a photon

E  None of the above processes are endothermic.

A  Core electrons are the easiest of all electrons to remove.

B  Valence electrons are most difficult of all electrons to remove.

C  Core electrons effectively shield outer electrons from nuclear charge.

D  Outer electrons efficiently shield one another from nuclear charge.

E  Valence electrons are most difficult of all electrons to remove, and outer electrons efficiently shield one another from nuclear charge.

A  3

B  1

C  8

D  5

E  2

A  C-I

B  N≡N

C  K-Br

D  C=O

E  C≡O

A  0

B  -1

C  +1

D  +2

A  2

B  3

C  4

D  1

E  0

A  0

B  4

C  2

D  3

E  1

A  square planar

B  seesaw

C  tetrahedral

D  square pyramidal