Thermochemistry Flashcard

heat capacity def

The amount of heat  (J) required to raise the temperature of a body (of any mass) 1 degree Celsius.

 


Q= mc?T


m= mass

c= specific

specific heat def

The amount of energy needed to raise the temperature of a substance by 1°C.

 

represented by ‘c’

specific heat of water
1 cal/ g° C
heat def
energy transferred btwn two species as a result of differences in their temperatures.
enthalpy (H) def

for any system at a constant pressure, the heat lost or gained.

 

unit: J

first law of thermoynamics

give equation and definition

?U= Q- W

change in the total internal energy of a system is equal to the amount of heat transferred (Q) minus the work ( W).

what are standard conditions used for measuring

?G,?H,?S

25 C (298 K)

1 atm

t or f: can the entrophy of a spontaneous rxn decrease?

true,

 

? G=  ?H- T ?S

(25- 100)= neg

(25-50)= still neg

true or false: entrophy is a measure of the randomness in a system
true

 true or false:

the entrophy of a amphous solid is greater than that of a crystalline solid.

true; an amphous solid’s atoms aren’t highly ordered like a crystalline solid.

 

 

true or false: at a constant temperature and pressure,the entrophy of the universe cannot spontaneously incease.
false, under these conditons the entrophy does increase spontaneously.
what is the critical point as noted on a phase diagram?
differences btwn the properties of 2 phases disappear
describe the energy level of a transition state or an activated complex
has greater energy than either the reactants or the products

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