Assuming a planar surface, calculate how long it will take to dissolve 1 mm thick layer from the mineral. The dissolution rate is a zeroth-order reaction
| Mineral | Formula | Density (g/cm3) | Log Rate (mol/m2) | pH | Concentration (moles/L) | Temperature (°C) |
| Quartz | SiO2 | 2.65 | -13.39 | 5 | 0.00001 | 25 |
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1. Pressurized tanks are commonly used in gas propulsion for space applications. A closed, rigid and insulated tank with a volume of 0.1 m3contains 0.7 kg of N2 and 1.1 kg of CO2at 27oC. Determine the following:
a. The composition in terms of mass fractions
b. The composition in terms of mole fractions
c. The partial pressure of each component
d. The mixture pressure
e. The heat transfer required to bring the mixture to 127oC
f. The entropy change of the mixture
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3. A key step in the production of sulfuric acid is the oxidation of SO2(g) to SO3(g):
2SO2(g) + O2(g) ----------> 2SO3(g)
At 298K, G= -141.6kJ; H=-198.4kJ; and S=-187.9J/K
a) Us the date to decide if this reaction is spontaneous at 25deg Cand predict how G will change with increasing T.
b) Assuming DH and DS are constant with increasing T, is the reaction spontaneous at 900deg C?
c) If the reaction reaches the equilibrium , calculate the temp.
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Water, sodium hydroxide, and 1,6-hexanediamine are all potential nucleophiles. Yet only 1,6-hexanediamine reacts with the adipoyl chloride. Offer an explanation as to why.
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A) A mixture of hydrogen and methane gases, in a 5.00 L flask at 73 °C, contains 0.381 grams of hydrogen and 2.42 grams of methane. The partial pressure of methane in the flask is _____ atm and the total pressure in the flask is ____ atm.
B) A mixture of carbon dioxide and nitrogen gases is maintained in a 9.24 L flask at a pressure of 3.39 atm and a temperature of 66 °C. If the gas mixture contains 23.1 grams of carbon dioxide, the number of grams of nitrogen in the mixture is ____ g.
C) The stopcock connecting a 1.07 L bulb containing neon gas at a pressure of 4.94 atm, and a 5.84 L bulb containing hydrogen gas at a pressure of 4.26atm, is opened and the gases are allowed to mix. Assuming that the temperature remains constant, the final pressure in the system is ____ atm.
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500ml of each of 0.200 M NaF and 0.050 M CaCl2 are mixed. Calculate the concentration of Ca^2+ remaining in solution after the precipitation of CaF2 is complete.
Ksp of CaF2 = 3.4x10^-11
A)0.05M
B)0.025M
C)3.4x10^-9M
D)1.7x10^-10M
E)1.4x10^-8M
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± Percent Ionization In addition to the acid-dissociation constant, Ka, another measure of the strength of an acid is percent ionization, determined by the following formula:Percent ionization=[HA] ionized[HA] initial×100% Percent ionization increases with increasing Ka. Strong acids, for which Ka is very large, ionize completely (100%). For weak acids, the percent ionization changes with concentration. The more diluted the acid is, the greater percent ionization. A convenient way to keep track of changing concentrations is through what is often called an I.C.E table, where I stands for "Initial Concentration," C stands for "Change," and E stands for "Equilibrium Concentration." To create such a table, write the reaction across the top, creating the columns, and write the rows I.C.E on the left-hand side. Initial (M)Change (M)Equilibrium (M)A+ B→AB |
A certain weak acid, HA, has a Ka value of 8.5×10−7. Part A Calculate the percent ionization of HA in a 0.10 M solution. Express your answer to two significant figures and include the appropriate units.
SubmitHintsMy AnswersGive UpReview Part Part B Calculate the percent ionization of HA in a 0.010 M solution. Express your answer to two significant figures, and include the appropriate units.
SubmitHintsMy AnswersGive UpReview Part Provi |
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A groundwater contains 1.2 mg/L of iron as Fe3+.
At what pH will all but 0.002 mg/L of Fe3+ precipitate, if the solid formed is ferric hydroxide?
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For each of the following compounds, please provide:
a) The best Lewis dot structure for the compound (include any non-zero formal charges). Draw this structure as a 3 dimensional representation that reflects the electron domain geometry for the compound.
b) The electron domain geometry for the compound. In other words, what would be the geometry if all lone pairs were replaced with atoms?
c) The molecular geometry for the compound. For the starred compounds below, there is more than one possible geometry. In that case, draw all possible geometries and indicate which of the geometries you have drawn is the best one, explaining how you arrived at the answer.
d) The location of any one mirror plane through the compound (if they exist). For example, CO2 has two sets of mirror places, one through the O-C-O axis, and another that bisects the O-C-O axis. Please be specific in your answer.
N2O SeBr4[*] ClOF2+ XeF3+[*]
SCl3F3 [*] I3+ SCN- H2SO4
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Can you draw out the mechanisms of 1-butanol, 2-butanol, and 2-methyl-2-propanol with the HCl ZnCl2 reagent? I need full structures.
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What is the pH of the solution obtained when 25.0 mL of 0.065M benzylamine, C7H7NH2, is titrated to the equivalence point with 0.050M HCl? Kb=4.7*10^-10. Part 2: What is the pH at the midpoint?
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A buffer solution contains 0.72 mol of hydrosulfuric acid (H2S) and 0.70 mol of sodium hydrogen sulfide (NaHS) in 8.60 L. The Ka of hydrosulfuric acid (H2S) is Ka = 9.5e-08.
(a) What is the pH of this buffer?
pH =
(b) What is the pH of the buffer after the addition of 0.17 mol of NaOH? (assume no volume change)
pH =
(c) What is the pH of the original buffer after the addition of 0.53 mol of HI? (assume no volume change)
pH =
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After studying biochemistry all day and night, you fall into a coma-like sleep for 12 hours. After a few hours of not eating, your body starts to say, “Hey, there is a low amount of glucose in my bloodstream, and my muscles that are keeping me alive right now are getting hungry for some energy production. I think I’ll let my pancreas secrete the hormone, glucagon, to go tell my liver and muscle cells to affect their carbohydrate metabolism.” Outline what happens after the glucagon binds to receptors on the outside of your liver/muscle cells. Make sure to mention all of the effected enzymes and major processes involved in carbohydrate metabolism.
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1) According to the activity series, which of these metals will react with most acids to produce H2 gas?
Ag, Ni, or K?
2) Calculate the molarity:
a) 0.750 mol of Na2S in 1.30L of solution. b) 32.7g of MgS in 773ml of solution.
3) What is the reduction half-reaction in Cl2+2Na ---> 2NaCl?
4) How many mL of 11.0 M HCL (aq) are needed to prepare 720.0ml of 1.00 M HCL (aq)?
5) 63.0 ml of a 1.50M solution is diluted to a total volume of 248ml. A 124ml portion of that solution is diluted by adding 161ml of water. What is the final concentration? Assume the volumes are additive.
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