Temperature
Heat measures which of the following types of energy?
- Kinetic energy
- Potential energy
Kinetic energy
Which of the following are included in the measure of total enthalpy?
Kinetic Energy
Chemical Energy
Potential Energy
All of them.
Entropy refers to the amount of _______ in a system.
randomness
Exothermic = net heat transfer system-->surroundings
Endothermic = net heat transfer surroundings-->system
Complete the equation:
q = ????
q = mcΔT
What is the difference between heat and temperature?
Heat = total kinetic energy
Temperature = average kinetic energy
Which is more easily measured?
Change in Enthalpy
Total Enthalpy
Change in Enthalpy
When a system increases in temperature, the entropy ________. (Increases/decreases)
increases
True or False: A reaction with a positive ΔG is spontaneous.
False
Name two of the laws of thermodynamics.
Conservation of mass/energy
Entropy of a closed system increases over time
What is a calorimetry experiment used to measure?
A calorimetry experiment measures the change in temperature of a process/reaction.
True or false: Enthalpy is an intensive property.
False, enthalpy is extensive.
The three degrees of freedom are...
Rotation
Translation
Vibration
Name three things which are conserved during a reaction.
Mass, Energy, Charge
complete the equation:
ΔG =
ΔG = ΔH-TΔS
What letter is used to represent specific heat? (hint: what equation does it appear in?)
c = specific heat
(appears in q=mcΔT)
A positive value for ΔH indicates that a reaction is _______.
endothermic
Entropy is represented by which letter in equations?
S
True or false: entropy is conserved during a reaction.
False
True or False:
ΔH = H of reactants - H of products
False, it is the other way around.
What is the difference between Specific Heat and Heat Capacity?
Specific heat is on a per-gram basis, heat capacity is for the whole system.
True or false: a system at absolute zero has zero enthalpy.
False. It has zero kinetic energy, but still has mass energy, potential energy, etc.
Two systems are completely identical, except one has much higher entropy. Which system has more enthalpy?
Neither. The second system has more Gibbs free energy, but the same amount of enthalpy.
True or False: combustion is spontaneous.
True
describe what each of the letters in the following equation refer to:
q = mcΔT
q = net transfer of energy
m= mass
c = specific heat
ΔT = change in temperature