Exam 4: Thermodynamics

Question 1

bomb calorimetry

Answer 1

measures energy
how much heat involved (not in water) to produce gas
think combustion
reaction in wall of metal sorrounded by water (volume is constant)
heat (q) equals energy (triangle T) –> measured in KJ/mol

Question 2

q = C triangle T

Answer 2

used in bomb calorimetry
surrounding heat (J) is heat capacity (J/Temp) times change of time (Temp)

Question 3

q surrounding equals

Answer 3

negative q reaction

Question 4

coffee cup calormetry

Answer 4

measures enthalpy
no heat transferred outside
aqueous solution in insulated coffee cup
enthalpy of reaction (Hrxn) equals heat of reaction (qrxn)

Question 5

q=mCsT

Answer 5

used in coffe cup calorimetry
surrounding heat (J) equals mass (g) times specific heat (J/g) times change in temp

Question 6

M equals

Answer 6

mol/L

Question 7

neutralization reaction

Answer 7

per 1 mole

Question 8

enthalpy (change of H) is negative when

Answer 8

reaction releases heat
temp is raised in solution
positive change of T
exothermic

Question 9

enthalpy is positive when

Answer 9

negative change of T
endothermic

Question 10

heat of formation

Answer 10

products - reactants

Question 11

bond association energy

Answer 11

reactants - products

Question 12

hess’ law

Answer 12

only KJ or Jules

Question 13

hydrogen bonding

Answer 13

done with hydrogen and FON