CHM Exam 2 Flashcards (Chapter 9 and Chapter 10)
(71 cards)
Energy
the capacity to do work or produce heat
First Law of Thermodynamics
energy is conserved and can be converted from one form to another
Energy is/isn’t a statement function
is
the internal energy for a system is the
sum of its potential and kinetic energy
the internal energy of a system can be changed by
work and heat
Internal energy formula
△E = q + w
work
force applied over a distance
Work is/isn’t a state function
isn’t
Heat
energy flow due to temperature difference
exothermic
energy as heat flows out of a system
endothermic
energy as heat flows into a system
Heat is/isn’t a state function
isn’t
Enthalpy forumla
H = E + PV
Formula for heat
q = mC△T
Enthalpy is/isn’t a state function
is
Hess’s Law
the change in enthalpy in going from a given set of reactants to a given set of products is the same whether the process takes place in one step or a series of steps
△H of reaction formula
△H(reaction) = sum of △H of products - sum of △H reactants
Heating an ideal gas at constant volume
- no PV work done
- all energy used to increase the translational energies of the gas molecules
- bomb calorimeter
Heating an ideal gas at constant pressure
- PV work done
- energy is used to increase the translational energies of gas molecules and do work
- coffee cup calorimeter
State function
refers to a property of a system that depends only on its present state
energy gained by the surroundings must be…
equal to the energy lost by the surroundings
work done by a gas
expansion
work done to a gas
compression
1 Latm = x J
101.325 J