chapter 5/chapter 6 Flashcards
(20 cards)
what is the standard atm pressure?
1 atm
what are the conversions from atm, torr, mmHg, Pa, psi, inHg
1atm=760 mmHg=760torr=101325 Pa=14.7 psi=29.92 inHg
what is thermochemistry?
the study of heat changes that accompany chemical reactions
what is internal energy?
the sum of heat and work
what is heat?
Heat is the transfer of thermal energy between system and surroundings and is a spontaneous process.
whats the specific heat capacity of water?
4.18
what is enthalpy?
the measure of heat at constant pressure
What does Boyles law state?
if volume goes up pressure goes down
What formula goes along with Boyles law?
P1V1=P2V2
What does Charles law state?
Temperature increases and volume increases
What formula goes along with Charles law?
V1/T1=V2/T2
what formula goes along with Avogadros law?
V1/n1=V2/n2
what formula goes along with the ideal gas law?
what does R stand for?
PV=nRT
.08206 Latm/molK
What is the difference between work and energy?
energy- capacity to do work
work-force acting through a distance
What do endothermic reactions do? Positive or negative heat? example?
absorbs heating from its surroundings.
+heat
sweat evaporating from skin
what do exothermic reactions do? Positive or negative heat? example?
gives off heat to surroundings
-heat
water freezing in the freezer
wood burning in a fire
What is Hess’s law?
heat evolved or absorbed in a chemical process is the same whether the process takes place in one or in several steps
What is the law of thermodynamics?
total energy of the universe is constant
energy can be converted from one form to another.
what is thermodynamics?
the study of energy and its interconversions
what is the equation for internal energy?
delta E= q+w
