Chem 1411 Exam 4 questions and answers
with solutions
What is the energy formula? - ANSWER Change E = q + w
heat - ANSWER exchange of thermal energy between the system and surroundings
temperature - ANSWER measure of amount of thermal energy within sample of matter
heat capacity - ANSWER the proportionality where an increase in temp is directly related to
amount of heat absorbed
Heat capacity formula - ANSWER -q = C * Change in Temp
specific heat capacity - ANSWER amount of heat energy required to raise temp of one gram of a
substance 1 degree celsius
specific heat capacity formula - ANSWER q = m*Cs*Change in temp
What are the units for specific heat capacity? - ANSWER J/g*degree celcius
molar heat capacity - ANSWER amount of heat required to raise temp of one mole of a
substance 1 degree celsius
formula for work - ANSWER -w = P(external pressure)* change in volume
-101.3 J = 1 atm
, enthalpy (H) - ANSWER sum of internal energy of a system and product of pressure and volume
enthalpy formula - ANSWER -H = E + PV
enthalpy change - ANSWER heat evolved in a reaction at a constant pressure
-the greater reactants, the greater the change
Hess's Law - ANSWER change in enthalpy for a stepwise process is the sum of enthalpy changes
of the steps
Quantum mechanical model - ANSWER explains manner in which electrons exist and behave in
atoms
amplitude - ANSWER height of wave
-measure of how intense light is (larger amp larger brightness)
wavelength - ANSWER measure of distance covered by wave
frequency (v) - ANSWER number of waves that pass point in a given period of time
-shorter wavelength higher frequency
electromagnetic spectrum - ANSWER visible light comprises only a small fraction of all
wavelengths of light
Order of energy for all the waves (lowest to high) - ANSWER 1) radio wave
2) microwave
3) infa-red (far, middle, near)
with solutions
What is the energy formula? - ANSWER Change E = q + w
heat - ANSWER exchange of thermal energy between the system and surroundings
temperature - ANSWER measure of amount of thermal energy within sample of matter
heat capacity - ANSWER the proportionality where an increase in temp is directly related to
amount of heat absorbed
Heat capacity formula - ANSWER -q = C * Change in Temp
specific heat capacity - ANSWER amount of heat energy required to raise temp of one gram of a
substance 1 degree celsius
specific heat capacity formula - ANSWER q = m*Cs*Change in temp
What are the units for specific heat capacity? - ANSWER J/g*degree celcius
molar heat capacity - ANSWER amount of heat required to raise temp of one mole of a
substance 1 degree celsius
formula for work - ANSWER -w = P(external pressure)* change in volume
-101.3 J = 1 atm
, enthalpy (H) - ANSWER sum of internal energy of a system and product of pressure and volume
enthalpy formula - ANSWER -H = E + PV
enthalpy change - ANSWER heat evolved in a reaction at a constant pressure
-the greater reactants, the greater the change
Hess's Law - ANSWER change in enthalpy for a stepwise process is the sum of enthalpy changes
of the steps
Quantum mechanical model - ANSWER explains manner in which electrons exist and behave in
atoms
amplitude - ANSWER height of wave
-measure of how intense light is (larger amp larger brightness)
wavelength - ANSWER measure of distance covered by wave
frequency (v) - ANSWER number of waves that pass point in a given period of time
-shorter wavelength higher frequency
electromagnetic spectrum - ANSWER visible light comprises only a small fraction of all
wavelengths of light
Order of energy for all the waves (lowest to high) - ANSWER 1) radio wave
2) microwave
3) infa-red (far, middle, near)
