CHEM 121-CHAPTER 5 (DR. DAVY)
LIBERTY UNIVERSITY QUESTIONS &
CORRECT ANSWERS
System - Correct Answer ✔✔ part of the universe that we are studying; a certain
amount of matter, or a certain region of space.
Surroundings - Correct Answer ✔✔ the matter or space outside the system; only that
matter or space that is affected by the system
Isolated System - Correct Answer ✔✔ neither matter nor energy can cross the
boundary between system and surroundings
Closed System - Correct Answer ✔✔ no matter can cross the boundary between
system and surroundings, but energy can.
Open System - Correct Answer ✔✔ Both matter and energy can cross the boundary
between system and surroundings
Energy - Correct Answer ✔✔ allows you to do work and transfers energy
Work - Correct Answer ✔✔ energy expanded to move an object against a force
Heat - Correct Answer ✔✔ energy transferred from a hotter object to a colder one.
1st Law of Thermodynamics - Correct Answer ✔✔ The change in internal energy of a
system equals heat added or released by the system and work done or by the system
Internal Energy (E) = - Correct Answer ✔✔ q + w
Enthalpy (H) = - Correct Answer ✔✔ E + PV
A reaction that releases heat to the surroundings is - Correct Answer ✔✔ Negative
Enthalpy
A reaction that absorbs heat to the surroundings is - Correct Answer ✔✔ Positive
Enthalpy
Work done due to Force - Correct Answer ✔✔ w = Force * Distance
Work done due to expansion - Correct Answer ✔✔ w = -P*V
LIBERTY UNIVERSITY QUESTIONS &
CORRECT ANSWERS
System - Correct Answer ✔✔ part of the universe that we are studying; a certain
amount of matter, or a certain region of space.
Surroundings - Correct Answer ✔✔ the matter or space outside the system; only that
matter or space that is affected by the system
Isolated System - Correct Answer ✔✔ neither matter nor energy can cross the
boundary between system and surroundings
Closed System - Correct Answer ✔✔ no matter can cross the boundary between
system and surroundings, but energy can.
Open System - Correct Answer ✔✔ Both matter and energy can cross the boundary
between system and surroundings
Energy - Correct Answer ✔✔ allows you to do work and transfers energy
Work - Correct Answer ✔✔ energy expanded to move an object against a force
Heat - Correct Answer ✔✔ energy transferred from a hotter object to a colder one.
1st Law of Thermodynamics - Correct Answer ✔✔ The change in internal energy of a
system equals heat added or released by the system and work done or by the system
Internal Energy (E) = - Correct Answer ✔✔ q + w
Enthalpy (H) = - Correct Answer ✔✔ E + PV
A reaction that releases heat to the surroundings is - Correct Answer ✔✔ Negative
Enthalpy
A reaction that absorbs heat to the surroundings is - Correct Answer ✔✔ Positive
Enthalpy
Work done due to Force - Correct Answer ✔✔ w = Force * Distance
Work done due to expansion - Correct Answer ✔✔ w = -P*V
