Consider the equilibrium CH4(g) + H2O(g) <--> CO(g) + 3H2(g), where delta h= 206 KJ. Which of the following disturbances will NOT cause the system to shift to the right to reestablish equilibrium?
A.) The partial pressure of CH4 increases.
B.) The partial pressure of CO decreases.
C.) The volume decreases.
D.) The temperature increases.
E.) All of these will cause the system to shift to the right.

How do volume e mass influence ΔH e q?

How does having waters of hydration affect the enthalpy for dissolving?

How does one obtain an appropriate mixture of methanol and water for recrystallizing a solid sample?

Write the balanced complete ionic equations and net ionic equations for the reactions that occur when each of the following solutions are mixed. (Type your answers using the format [NH4]+ for NH₄⁺ or Ca3(PO4)2 for Ca₃(PO₄)₂. Use the lowest possible coefficients.)

(a) (NH₄)₃PO₄(aq) and CaCl₂(aq)

complete ionic equation:

net ionic equation:

(b) Pb(NO₃)₂(aq) and Na₂S(aq)

complete ionic equation:

net ionic equation:

(c) Al₂(SO₄)₃(aq) and K₃PO₄(aq)

complete ionic equation:

net ionic equation:

The standard enthalpies of formation of PbS(s), SO2(g) and PbO(s) are -98.3, -296.8. and -217.3kj mol respectively.

Calculate the reaction enthalpy for the roasting of PbS(s).

PbS(s)+3O2(g)--->2SO2(g)+2PbO(s)

Consider the balanced chemical reaction shown below.

4 PH3(g) + 8 O2(g) 6 H2O(l) + 1 P4O10(s)

In a certain experiment, 3.382 g of PH3(g) reacts with 8.377 g of O2(g).

(a) Which is the limiting reactant?

(b) How many grams of H2O(l) form?

(c) How many grams of P4O10(s) form?

(d) How many grams of the excess reactant remains after the limiting reactant is completely consumed?

A 0.140-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium? Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.

please show all work and answer

Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.120 M pyridine, C5H5N(aq) with 0.120 M HBr(aq):

a) before addition of any HBr

b) after addition of 12.5 mL of HBr

c) after addition of 18.0 mL of HBr

d) after addition of 25.0 mL of HBr

e) after addition of 36.0 mL of HBr

Calculate the volume of 0.20 mol/L KH₂PO₄ and the volume of 0.10 mol/L NaOH required to prepare 50.0 mL of buffer with a formal (or total) concentration of H₂PO₄ of 0.020 mol/L  and a pH = 6.3. Repeat this calculation for buffers (of the same volume and formal concentration) with pH = 6.5, 6.9, 7.5, 7.9, and 8.2.

Proteins can move laterally in biomembranes and the lateral distance (r) traveled in a given time (t) is given by, The diffusion constant for (D) for the membrane protein fibronectin is approximately 0.7 x 10-12 cm2·sec-1, whereas that for rhodopsin is about 3.0 x 10-9 cm2·sec-1. a. calculate the distance (r) traveled by each of these proteins in 10 msec (answer in nm; be sure to circle your answers) b. what can you reasonably assume about the interactions of these two proteins with other membrane components? Your answer should be 1-4 sentences.

pK of the side chains of glutamate and lysine is 4.25, and 10.53, respectively. Circle the answer: A protein containing 3 glutamate residues and 4 lysine residues is (negatively, positively) charged at neutral pH, and its isoelectric point is in the (acidic, basic) region of pH.

Calculate the predicted pH of a .1M Solution of each of the following

CH₂ClCOOH with K_a=1.4x10^-3

NaHSO₄ with K_a = 1.2 x 10^-2

Chemical Process Calculations (Chem Eng Question)

Assume the combustion of Butane (C4H10) in air to be complete.

a) Use a degree-of-freedom analysis to prove that if the precentage excess air and the percentage conversion of butane are specified, the molar composition of the product gas can be determined.

(b) Calculate the molar composition of the product gas for each of the following three cases:

i) theorectical aire supplied, 100% conversion of butane;

ii) 20% excess air, 100% conversion of butane; and

iii) 20% excess air, 90% conversion of butane.

Aldol condensation

Compare the Wittig reaction to the aldol condensation (you should provide at least three similarities and three differences)