Chem 162 Exam 2025 Questions and
Verified Answers
which species has a standard enthalpy of formation of zero (delta H of f degrees)
- C (s, diamond)
- NaCl (s)
- H2 (g)
- Br (l)
- Al2 (s)
H2 (g)
which of the following ways is not a way to calculate enthalpy of a reaction?
using enthalpies of formation
the temperature change of a reaction is the enthalpy of reaction
the using a calorimeter to determine q cal, relate that. to q run and then delta h rxn
apply hess law using a series of known enthalpy of reactions to achieve an overall enthalpy
of reaction
using bond energies of the reactants and products
- the temperature change of a reaction is the enthalpy of reaction
which of the following processes is spontaneous?
- you get an a in this course
- the Tupperware drawer is organized
- a broken touchscreen fixes itself
, - rust turns into iron metal and oxygen gas
- sugar dissolves in tea
- sugar dissolves in tea
in a spontaneous process, the entropy of the ______________ always increases
- universe
- surroundings
- system
- system and the universe
- system, surroundings, and universe
- universe
at 0 K the entropy of a perfect crystal is
<0
>0
=0
=0
positive entropy
more disorder
In an exothermic reaction, the external entropy (entropy of the surroundings) __________
increases
endothermic rxn and q
q is +
exothermic rxn and q
q is -
w=+
Verified Answers
which species has a standard enthalpy of formation of zero (delta H of f degrees)
- C (s, diamond)
- NaCl (s)
- H2 (g)
- Br (l)
- Al2 (s)
H2 (g)
which of the following ways is not a way to calculate enthalpy of a reaction?
using enthalpies of formation
the temperature change of a reaction is the enthalpy of reaction
the using a calorimeter to determine q cal, relate that. to q run and then delta h rxn
apply hess law using a series of known enthalpy of reactions to achieve an overall enthalpy
of reaction
using bond energies of the reactants and products
- the temperature change of a reaction is the enthalpy of reaction
which of the following processes is spontaneous?
- you get an a in this course
- the Tupperware drawer is organized
- a broken touchscreen fixes itself
, - rust turns into iron metal and oxygen gas
- sugar dissolves in tea
- sugar dissolves in tea
in a spontaneous process, the entropy of the ______________ always increases
- universe
- surroundings
- system
- system and the universe
- system, surroundings, and universe
- universe
at 0 K the entropy of a perfect crystal is
<0
>0
=0
=0
positive entropy
more disorder
In an exothermic reaction, the external entropy (entropy of the surroundings) __________
increases
endothermic rxn and q
q is +
exothermic rxn and q
q is -
w=+
