Chem CH10 Flashcards
Thermochemistry
energy changes in chemical reactions
When heat goes into a system it is (+/-)
+
When heat leaves a system and goes into surroundings it is (+/-)
-
When work is done on the system it is (+/-)
+
When work is done on the surroundings it is (+/-)
-
1st law of thermodynamics
energy cannot be created or destroyed, only transferred
Is pressure a state function?
yes
is volume a state function?
yes
is temperature a state function?
yes
is work a state function
no
is heat (q) a state function?
no
Is enthalpy a state function?
yes
Is internal energy a state function?
yes
In a ______ system, no matter nor energy can be transferred from its system to surroundings
isolated
In a ________ system, only energy can flow between system and surroundings
closed
in a _____ system, energy and matter can flow freely between system and surroundings
open
When energy flows from surroundings into its system (endo/exo)
endothermic
when energy flows from its system into the surroundings (endo/exo)
exothermic
Is endothermic reaction (+/-)
+
When work is done by system on surroundings, are the moles of reactants (>/
< less than
When work is done on the system by surroundings, are the moles of reactants (>/
> greater than
Enthalpy of fusion is the energy required to change a sample from ______ to ______.
solid to liquid
Enthalpy of Vaporization is the energy required to change a sample from _____ to _____.
liquid to gas
Heat capacity of a substance is the energy required to…
raise the temperature by 1º C at constant pressure
Calorimeter measures the quantity of energy…
transferred during a phase change or chemical reaction
