Exam 1 (Lec 1-10)

Question 1

First Law of Thermodynamics

Answer 1

Any change in the internal energy (U) of a system must equal the transfer of energy as heat or work

Question 2

Enthalpy

Answer 2

The thermodynamic potential of a system

Question 3

At constant pressure, enthalpy is equivalent to…

Answer 3

Heat

Question 4

What variable (and sign) refers to Exothermic?

Answer 4

-H

Question 5

What Delta variable refers to a reaction the releases heat?

Answer 5

DeltaH

Question 6

What Delta variable described the change in a system’s randomness?

Answer 6

DeltaS

Question 7

Definition of free energy (Equation)

Answer 7

G = H-TS

Question 8

When the change in Gibbs Free Energy (DeltaG) is negative, a process is considered…

Answer 8

Spontaneous

Question 9

Equation for Enthalpy

Answer 9

H = U + PV

Question 10

What processes occur without input of energy?

Answer 10

Spontaneous

Question 11

What processes require an input of energy?

Answer 11

Non-spontaneous

Question 12

Second Law of Thermodynamics

Answer 12

The entropy of a system tends to increase

Question 13

Entropy is a function of…

Answer 13

Entropy

Question 14

The downward motion of an object releases what kind of energy?

Answer 14

Potential Energy

Question 15

Is potential energy considered spontaneous/non-spontaneous

Answer 15

Spontaneous

Question 16

Ender/ExerGONIC refer to what variable changes?

Answer 16

DeltaG

Question 17

Endo/ExoTHERMIC refer to what variable changes?

Answer 17

DeltaH
- Internal energy of molecules
- Measured as heat GIVEN up or TAKEN up

Question 18

Equation for the Second Law of Thermodynamics

Answer 18

DeltaS(system) + DeltaS (surroundings) = DeltaS(universe) > 0

Question 19

A NEGATIVE change in Enthalpy

Answer 19

Heat from system –> surroundings

Question 20

A POSITIVE change in Enthalpy

Answer 20

Heat from surroundings –> system

Question 21

The amount of energy available to do work

Answer 21

Free-Energy Change (DeltaG)