Tuesday
July 29, 2014

Posts by Jematormal91


Total # Posts: 35

Chemistry
A d1 octahedral complex is found to absorb visible light, with the absorption maximum occcurring at 523 nm. a) Calculate the crystal-field splitting energy, Δ , in kJ/mol.

Chemistry
Indicate how many stereoisomers are possible for each compound. b) tetrahedral [NiCl2Br2]2– c) octahedral [Fe(CO)4BrCl]

Chemistry
A copper ore consists of 6.32% chalcopyrite, CuFeS2(s). How many grams of ore must be processed to obtain one gram of copper?

Chemistry
A copper ore consists of 6.32% chalcopyrite, CuFeS2(s). How many metric tons of ore must be processed to obtain one metric ton of copper?

CHEMISTRY
Consider the following cell: Pt|H2(g, 0.130 atm)|H (aq, ? M)||Ag (aq, 1.00 M)|Ag(s) If the measured cell potential is 0.90 V at 25 °C and the standard reduction potential of the Ag /Ag half-reaction couple is 0.80 V, calculate the hydrogen ion concentration in the anode co...

Chemistry
For the following battery: Cd(s) | CdCl2(aq) || Cl–(aq) | Cl2(l) | C(s) Write the reduction half reaction for the C(s) electrode.

Chemistry
For the oxidation-reduction reaction equation given here, 2Rb+Br2 --> 2RbBr Indicate how many electrons are transferred in the formation of one formula unit of product.

Chemistry
For the oxidation-reduction reaction equation given here, 2Rb+Br2 --> 2RbBr Indicate how many electrons are transferred in the formation of one formula unit of product.

Chemistry
Using Lewis Formulas, assign the oxidation states to the atoms in: (a) CH3S–SCH3(l) Assume sulfur is more electronegative than carbon.

Chemistry
Why can some borax also dissolve at room temperature?

Chemistry
A geologist removes a sample of water from a lake in Nevada where the water level has been slowly dropping over time. The sample is found to be 0.02M in borax. The lake is circular in shape and is currently 500 meters in diameter and 50 meters deep. Using the given data predic...

Chemistry
Given that ΔGrxn>0, how do you explain that some of the borax actually dissolves at 25deg C?

Chemistry
Consider a process in which an ideal gas is compressed to one-sixth of its original volume at constant temperature. Calculate the entropy change per mole of gas.

Chemistry
Consider a process in which an ideal gas is compressed to one-sixth of its original volume at constant temperature. Calculate the entropy change per mole of gas. I know that the formula is chg.entropy= nRln(V2/V1), but how do I get the values for V2 and V1?

Chemistry
An experimental spacecraft consumes a special fuel at a rate of 2.10 × 102 L/min. The density of the fuel is 0.690 g/mL and the standard enthalpy of combustion of the fuel is –39.8 kJ/g. Calculate the maximum power (in units of kilowatts) that can be produced by thi...

Chemistry
Why is AlCl3 an Arrhenius Acid, while BCl3 is not? How can I determine which is an Arrhenius Acid?

Chemistry
Thank you for your help!

Chemistry
I think I did it wrong... Ksp[Ag2SO4]= [SO42-][Ag+]^2 1.20x10^-5 = [SO42-][0.0350]^2 [SO42-}=9.80x10^-3M Then I substituted into: Ksp[CaSO4]= [SO42-][Ca2+] 4.93x10^-5 = [9.80x10^-3][Ca2+] [Ca2+]= 5.03x10^-3M

Chemistry
I'm actually not sure how to solve it, now I think the [Ca+]= 0.0500M

Chemistry
From my textbook, Ksp(Ag2SO4)= 1.20x10^-5 Ksp(CaSO4)= 4.93x10^-5

Chemistry
A solution contains 0.0500 M Ca2 (aq) and 0.0350 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca2 (aq) can be separated from the Ag (aq) by selective precipitation? -Solving the 1st one I got [Ca2+]= 5.03x10...

Chemistry
Thank you so much!

Chemistry
A solution contains 0.0200 M Pb2 (aq) and 0.0200 M Sr2 (aq). If we add SO42–(aq), what will be the concentration of Pb2 (aq) when SrSO4(s) begins to precipitate?

Chemistry
Copper(I) ions in aqueous solution react with NH3(aq) according to: Cu+(aq) + 2NH3(aq) > Cu(NH3)2+ (aq) Kf=6.3x10^10 M^-2 Calculate the solubility (in g·L–1) of CuBr(s) in 0.65 M NH3(aq).

Chemistry
Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.03? The Ksp of Fe(OH)2 is 4.87×10-17 M3.

Chemistry
Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH2PO4(s) and 27.0 g of Na2HPO4(s) in water and then diluting to 1.00 L. (pKa=7.21)

Chemistry
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.240 M sodium benzoate. How much of each solution should be mixed to prepare this buffer?

Chemistry
When I solve for b/a it equal 0.17, but I'm supposed to find how much more acetic acid should be in the solution.. How do I do that?

Chemistry
How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?

CHEMISTRY
I tried doing it and got for a) -0.03 and b) 0.03 but the program keeps telling me I have the wrong answers... I don't know what I am doing wrong.

CHEMISTRY
a) Calculate the change in pH when 4.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). b) Calculate the change in pH when 4.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.

Chemistry
Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. The acid dissociation constants listed in most standard reference texts for carbonic acid actually apply to dissolved CO2. K=0.032 M/atm...

Chemistry
Calculate the pH when 39.0mL of 0.321 of HA is mixed with 39.0mL of 0.321M NaOH where HA is a monoprotic weak acid with Ka= 7.5x10^-5 M ?

Chemistry
A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume of household bleach that should be diluted with water to make 500.0 mL of a pH = 10.23 solution.

CHEMISTRY
What gets substituted into the formula M1V1=M2V2? I don't understand...

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