Part A
Calculate the equilibrium constant at 25 ∘C for the
reaction
Ni(s)+2Ag+(aq)→Ni2+(aq)+2Ag(s),
if
Ni2+(aq)+2e−→Ni(s), E∘
= -0.26 V,
Al+(aq)+e−→Al(s), E∘ =
0.80 V
Express your answer using one significant figure.
Part B
Calculate the equilibrium constant at 25 ∘C for the
reaction
Hg2+2(aq)→Hg(l)+Hg2+(aq)
See Appendix D for standard reduction potentials.
Express your answer using one significant figure.
In: Chemistry
Which of the following statements about quantum theory is incorrect?
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a. |
The energy and position of an electron cannot be determined simultaneously. |
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b. |
Lower energy orbitals are filled with electrons before higher energy orbitals. |
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c. |
When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. |
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d. |
No two electrons can have the same four quantum numbers. |
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e. |
All of these are correct. |
The answer is C for Hund's rule but why A is correct?
I think that the uncertainty principle is about [ position-momentum ] and [ time-energy ] .
In: Chemistry
Explain the general concept of a force field in molecular modelling and explain why it might be used instead of a first-principles method.
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What answer should be reported, with the correct number of significant figures, for the following calculation (249.36+ 41.3)/63.7?
In: Chemistry
1.Why doesn’t initiation occur in the micelles in emulsion polymerization?
2.Describe a gel for drug release.
In: Chemistry
Silicon has a diamond crystal structure with lattice constant of a= 0.543 nm and molar mass of 28.08 g/mole. (12 points) a) Explain in brief the position of silicon atoms in the unit cell and deduce the corresponding Bravais lattice and state the equivalent positions b) Calculate the density of silicon in g/cm3. c) Calculate the number of silicon atoms per square centimeter (# Si atoms/cm2) on the (100) and (111) faces
In: Chemistry
Thermodynamic driving forces for ligand association 1 page (min 300 words). Describe the various components of the Gibbs free energy and how these changes upon binding. Discuss who favors binding and which prevent binding. Describe the intermolecular interactions that may contribute to ∆Gbind. The information can be retrieved from books or similar sources.
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A 0.15 M solution of a weak acid is found to be 1.3% ionized. What is its Ka?
In: Chemistry
Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g)→CO(g)+3H2(g)CH4(g)+H2O(g)→CO(g)+3H2(g) In a particular reaction, 26.5 LL of methane gas (measured at a pressure of 736 torr and a temperature of 25 ∘C) is mixed with 22.6 L of water vapor (measured at a pressure of 702 torr and a temperature of 125 ∘C). The reaction produces 26.2 L of hydrogen gas at STP. Part A What is the percent yield of the reaction?
In: Chemistry
. In general what are the differences between hard ionization and soft ionization sources? What kind of
molecular spectra would you expect to see from using each technique? Provide one example for
each.
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How do you find initial quantum number (ni) when given the values c=3.00 x 10^8 h=6.63 x 10^-34 nf=2 nm=656.2 and m=6.562x10^-7
For the values; Red light= 656.2nm , Green light= 486.1nm, Blue light 434.0nm, and violet light= 410.0
In: Chemistry
1. Calculate the molar mass of each of the following compounds: a. Ethyl chloride , C2H5CI b. Phenobarbital, C12H12N2O3 C.Sodium carbonate, NaHCO3 d. Aluminum sulfate, Al2(SO4)3 e. Diethyl ether, (C2H5)2 O 2. Calculate the number of molecules in each of the following samples. a. 3.04 mol of C8H18 b. 0.002 mol of aspirin, C9H8O4 3. Calculate the mass of each of the following sample. a 17.2 mol of CO2 b . 0.053 mol of (NH4)3PO4 4. Calculate the number of moles in each of the following samples. a. 3.69 x 10 to the power of 24, atoms of uranium, U b. 7.54 x10 to the power of 23 molecules of H2O c. 76.9 g of BaSO4 d. 146.2 g of C2H5OH 5. under certain circumstances, carbonn dioxide , CO2(g), can be made to react with hydrogen gas.H2(g), to produce methane , CH4(g), and water vapour , H2O(g); CO2(g) +4H2(g)----->CH4(g) +2H2O(g) How many moles of methanes are produced when 71.1 moles of carbon dioxide gas react with excess hydrogen gas?
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In Chernobyl (miniseries) why did people use lead coffins and concrete to bury fallen firefighters? Try to write 500+ words.
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5- Ascorbic acid (molecular weight = 176.12) is too acidic to administer by the parenteral route. The acidity of ascorbic acid is partially neutralized by adding a basic compound, usually sodium carbonate or sodium bicarbonate. Thus, the injectable product contains sodium ascorbate, ascorbic acid and the neutralizing agent.
a. What is the pH of an injectable solution containing only ascorbic acid in the concentration of 55 g per liter of solution (Ka1 = 5 x 10-5 and Ka2 = 1.6 x 10-12).
b. What is the molar ratio of sodium ascorbate to ascorbic acid and the percentage required to prepare an injectable solution with a pH of 5.77?
In: Chemistry
For the following reaction, Kc = 255 at 1000 K.
CO (g) + Cl2 (g) ⇌ COCl2 (g)
A reaction mixture initially contains a COconcentration of 0.1550
M and a Cl2concentration of 0.178 M at 1000
K.
What is the equilibrium concentration of CO at 1000 K?
What is the equilibrium concentration of Cl2 at 1000 K?
What is the equilibrium concentration of COCl2 at 1000 K?
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