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
In an exothermic reaction heat _______________ the system
leaves or exits
The units of energy is...
Joules
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 (does not matter how much stuff is measured) property.
False, enthalpy is extensive.
The entropy of the universe is...
increasing
Name three things which are conserved during a reaction.
Mass, Energy, Charge
the equation:
ΔG = ΔH-TΔS is used to predict....
if a reaction is spontaneous
What letter is used to represent heat in the equation
q=mcΔT
q= heat
A positive value for ΔH indicates that a reaction is _______.
endothermic
Entropy is represented by which letter in equations?
S
If entropy increases and enthalpy increases or entropy decreases and enthalpy decreases, whether or not the reaction is spontaneous depends on....
temperature
True or False:
spontaneous reactions happen fast
False
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.
In the following reaction
N2 + 3 H2 --> 2 NH3
Entropy is ...
True or False: combustion is spontaneous.
True
What does the symbol "Δ" mean?
Δ = change in