Enthalpy
True or False:
ΔH = H of reactants - H of products
False, it is the other way around.
Entropy refers to the amount of _______ in a system.
randomness/chaos/disorder
What is the difference between an exothermic reaction and an endothermic reaction?
Exothermic = net heat transfer system-->surroundings
Endothermic = net heat transfer surroundings-->system
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
Enthalpy is represented by which letter in equations?
H
True or false: entropy is conserved during a reaction.
False
Name two things that are conserved during a reaction.
Mass & Energy
A positive value for ΔH indicates that a reaction is _______.
endothermic
Entropy is represented by which letter in equations?
S
complete the equation:
ΔG =
ΔG = ΔH-TΔS
H2O(l) --> H2O(g) ΔH = +44.0 kJ/mole
Calculate ΔH for evaporating 45.00g of water
110kJ
H2O(l) --> H2O(g)
ΔS = + or - ?
Positive.
True or False: combustion is spontaneous.
True