Thermochemistry
This is the enthalpy change when 1 mol of a substance is formed from its elements in standard states, used to calculate deltaH rxn.
What is the standard enthalpy of formation?
This is the pH of a 0.025M solution of Ba(OH)2
What is 12.70?
This is the expression for Kc for the reaction:
N2(g) + 3H2(g) >< 2NH3(g)
What is [NH3]^2 / [N2] [H2]^3?
These are the four ways to calculate deltaH?
What are Hess's Law, Enthalpies of Formation, Bond Energies, and q=mcdeltaT?
On a titration curve of a weak acid and strong base, this point represents the best place to determine the pKa.
What is the half-equivalence point?
A 20.0g metal at 120C is dropped into 1000.0 g of water at 25.0C. The final temperature is 28.0C. Given that the specific heat capacity of water = 4.18 J/g(C), calculate the metal's specific heat.
What is 0.35 J/g(C)?
This is the Ka of a weak acid if a 0.100M solution has a pH of 3.00.
What is 1.0 x 10^-5?
A system with K < Q will shift in this direction.
What is left/towards the reactants?
What is weak acids only partially dissociate into ions?
This is the energy change that is occuring from points 3-5 on this diagram and what the flat region at 4 represents. (see doc)
What is heat of vaporization? What is the temperature being constant as bonds are broken?
This is the spontaneity of a reaction at 298K when deltaH = -92.0 kJ and deltaS = -198 J/mol(K).
What is spontaneous?
A buffer solution contains 0.200M HF and 0.150M NaF. The pKa of HF is 3.17. This is the pH.
What is 3.05?
For the reaction:
CO(g) +Cl2(g) >< COCl2(g) Kc = 8.00
If [CO] = [Cl2] = 0.50M and [COCl2] = 0.25M, this is the direction the reaction shifts.
What is right/towards the products?
This is why the temperature remains constant during the melting of ice, even though heat continues to be added. (see doc)
What is the energy is used to break intermolecular forces (enthalpy of fusion), not raise temperature?
This type of diagram shows a reaction in which q would be negative. (Please draw your answer)
What is an exothermic reaction profile? (answer in doc)
This is the amount of heat released when 10.0g of propane (C3H8) is completely combusted. deltaH comb = -2220 kJ/mol.
What is -504.5 kJ?
At the equivalence point of a weak acid-strong base titration, this is the dominant species and the reason why the pH > 7. (see doc)
What is the conjugate base?
This is the Kp for
2NO2(g) >< 2NO(g) + O2(g)
at 298K, given Kc = 1.2 x 10^-3
Kp = 0.029 atm
A buffer made from acetic acid and sodium acetate resists changes in pH when small amounts of NaOH are added because of this principle.
What is the common ion effect?
This diagram illustrates a strong monoprotic acid titrated with strong base. (Please draw your answer)
*Answer in doc*
A chemical reaction has deltaH = 56.0 kJ and deltaS = 125 J/mol(K). This is the temperature at which the reaction becomes spontaneous.
What is 448K?
A 25.0 mL sample of 0.100M HCl is titrated with 0.100M NaOH. This is the pH after 30.0 mL of base has been added.
What is 11.00?
A 1.00 L container has 1.00 mol of SO2 and O2 each to begin with. For the reaction:
2SO2 + O2 >< 2SO3 K = 10
This is [SO3] at equilibrium.
What is 1.20M?
A reaction vessel is sealed and the system reaches equilibrium. The pressure is then increased by adding an inert gas. This is the shift in equilibrium.
What is no change: adding an inert gas does not affect partial pressures of reactants/products?
This is the type of acid that would cause this graph during a titration. (see doc)
What is a diprotic acid?