Chemistry concepts and calculations

a) Silane, SiH 4 , is prepared according to the following equations: Si (s) + 3

a) Silane, SiH4, is prepared according to the following equations: Si(s)  +  3 HCl(g)  ?  HSiCl3(l)  +  H2(g) 4 HSiCl3(l)  ?  SiH4(g)  +  3 SiCl4(l) If you use 2.51 moles of solid…

a) Silver thiocyanate is often used as a test for silver ion in qualitative anal

a) Silver thiocyanate is often used as a test for silver ion in qualitative analysis. Using the solubility product constant (Ksp = 1.1E-12), calculate the molar solubility of silv…

a) Sketch a graph of 1/v o vs. 1/[S] for the 4 different compounds (labeling eac

a) Sketch a graph of 1/vo vs. 1/[S] for the 4 different compounds (labeling each line 1-4). Label the relevant points on your sketch that are expected given the information provid…

a) Solid nickel(II) acetate is slowly added to 150 mL of a 0.0539 M sodium hydro

a) Solid nickel(II) acetate is slowly added to 150 mL of a 0.0539 M sodium hydroxide solution. The concentration of nickel ion required to just initiate precipitation is _____M. b…

a) Solid sodium hydroxide is slowly added to 150 mL of a 0.0610 M silver nitrate

a) Solid sodium hydroxide is slowly added to 150 mL of a 0.0610 M silver nitrate solution. The concentration of hydroxide ion required to just initiate precipitation is  M. b). So…

a) Sufficient sodium cyanide, NaCN, was added to 0.025 M silver nitrate, AgNO 3

a) Sufficient sodium cyanide, NaCN, was added to 0.025 M silver nitrate, AgNO3, to give a solution that was initially 0.150 M of a cyanide ion, CN-. What is the concentration of s…

a) Suppose 0.20 M NaCl is placed in arm A and 0.30 M NaCI is same levels intiall

a) Suppose 0.20 M NaCl is placed in arm A and 0.30 M NaCI is same levels intially. What would happen to the liquid levels afler eoqul n ar b) Supposed you the had used 0.20 M NaCl…

a) Suppose a reactant A undergoes liquid-phase reactions according to the follow

a) Suppose a reactant A undergoes liquid-phase reactions according to the following kinetics scheme Reaction Desired?Rate law Activation ener AB 2 A C A3 i) Does a favorable produ…

a) Suppose you and two friends named Alex and Bob share a 200 Kilobits/sec DSL c

a) Suppose you and two friends named Alex and Bob share a 200 Kilobits/sec DSL connection to the Internet. You need to download a 100 Megabyte file using FTP as soon as possible. …

a) The Iodine number (I#) is the mass of iodine that binds 100 g of fatty acid.

a) The Iodine number (I#) is the mass of iodine that binds 100 g of fatty acid. An experiment shows that 1 g of the unknown fatty acid binds 0.98 g of I2. Calculate I# for the unk…

a) The antacid component of Tumsr is calcium carbonate. Assume Tumsr is 40.0 per

a) The antacid component of Tumsr is calcium carbonate. Assume Tumsr is 40.0 percent CaCO3 by mass. If we have 400. mg of Tumsr how many ml of 0.100 M HCl can we neutralize? Expre…

a) The atoms on the surface are more reactive than the atoms in the grain bounda

a) The atoms on the surface are more reactive than the atoms in the grain boundaries. b) The diffusion coefficient of hydrogen atom in fcc iron is higher than that in bcc iron. _ …

a) The average kinetic energy of the oxygen molecules is determined only by temp

a) The average kinetic energy of the oxygen molecules is determined only by temperature. the average kinetic energy is not changed by the compression of O2 at constant temperature…

a) The change in energy accepted during this case is the sum of the 1st ionisati

a) The change in energy accepted during this case is the sum of the 1st ionisation enthalpy of potassium and 1st electron gain enthalpy of fluorine. b)The change in energy accepte…

a) The cyclic voltammogram of catechin, a polyphenol found in wine, was recorded

a) The cyclic voltammogram of catechin, a polyphenol found in wine, was recorded in aqueous solution in buffer and in the presence of SO2 (see scans (i) and (ii) above). Why does …

a) The dissociation of propanic acid (CH_3 CH_2 CO_2 H) in water b) The dissocia

a) The dissociation of propanic acid (CH_3 CH_2 CO_2 H) in water b) The dissociation of perchloric (HClO_) acid in water Fill the missing information in the following table. Calcu…

a) The distribution constants for acompound are as follows: Kcyclohexane/water =

a) The distribution constants for acompound are as follows: Kcyclohexane/water = 1.5 Kdiethyl ether/water = 5.1 You have an aqueous mixture of thecompound. Which solvent system, c…

a) The distribution constants for acompound are as follows: Kcyclohexane/water =

a) The distribution constants for acompound are as follows: Kcyclohexane/water =1.5 Kdiethyl ether/water = 5.1 You have an aqueous mixture of thecompound. Which solvent system, cy…

a) The energy content of a Krispy Kreme donut is 1050 kJ. If a 70 kg person were

a) The energy content of a Krispy Kreme donut is 1050 kJ. If a 70 kg person were a closed thermodynamic system, calculate the body temperature rise that would result from eating o…

a) The equations for the dissolution of Calcium Chlorideand sodium bicarbonate i

a) The equations for the dissolution of Calcium Chlorideand sodium bicarbonate in water. (b) Look up the Heats of solutions for calcium chlorideand sodium bicarbonate (indicate ex…

a) The equilibrium reaction is given as Ca 3 (PO 4 ) 2 (s) 3 Ca 2+ (aq)

a) The equilibrium reaction is given as Ca3(PO4)2 (s) <======> 3 Ca2+ (aq) + 2 PO43- (aq) b) Let x be the solubility of Ca3(PO4)2. Then, the solubility of Ca2+ = 3x and that…

a) The hard-soft acid-base theory developed by Pearson has been used to predict

a) The hard-soft acid-base theory developed by Pearson has been used to predict the position of equilibrium for many reactions. Explain the position of the equilibria for the foll…

a) The intensity of a light beam I is the product of the light field’s energy de

a) The intensity of a light beam I is the product of the light field’s energy density and the velocity of light, namely where F is the light’s electric field strength. Calculate i…

a) The molar volume of Me2X3 at 25.000°C and 1.0000 atm is 32.000cm3/mol. The CT

a) The molar volume of Me2X3 at 25.000°C and 1.0000 atm is 32.000cm3/mol. The CTE, , is 25.000 x 10-6 K-1 and isothermal compressibility, , is 300.000 x 10-7 atm-1. Assume that an…

a) The molecular shape of [BrO3]- is __________, and it’s a ___________ molecule

a) The molecular shape of [BrO3]- is __________, and it’s a ___________ molecule. Trigonal pyramidal , polar Tetrahedral , polar Trigonal planar , polar Tetrahedral , non polar b)…

a) The molecular shape of [BrO3]- is __________, and it’s a ___________ molecule

a) The molecular shape of [BrO3]- is __________, and it’s a ___________ molecule. Trigonal pyramidal , polar Tetrahedral , polar Trigonal planar , polar Tetrahedral , non polar b)…

a) The molecule has no optical activity. b) The molecule has an enantiomer. c) T

a) The molecule has no optical activity. b) The molecule has an enantiomer. c) The molecule has a mirror plane in the molecule. d) None of the above. 16. What term describes the s…

a) The principle buffer system in human blood involves the weak acid, carbonic a

a) The principle buffer system in human blood involves the weak acid, carbonic acid (H2CO3), and its conjugate base, bicarbonate ion (HCO3 - ), H2CO3(aq) + H2O(l) ? H3O + (aq) + H…

a) The radioisotope phosphorus-32 is used in tracers for measuring phosphorus up

a) The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 14.3 days. How many milligrams of a 98.8 milligra…

a) The rate of formation of C in the reaction A + 3B 3C + 2D is 1.5 mol/L/s. Sta

a) The rate of formation of C in the reaction A + 3B 3C + 2D is 1.5 mol/L/s. State the rates of formation or consumption of A, B, and D b) The stoichiometry of a particular liquid…

a) The solubility of magnesium fluoride , MgF 2 , in water is 1.5E-2 g/L. What i

a) The solubility of magnesium fluoride, MgF2, in water is 1.5E-2 g/L. What is the solubility (in grams per liter) of magnesium fluoride in 0.11 M of sodium fluoride, NaF? = _____…

a) The solubility of silver sulfate, Ag 2 SO 4 , in water has been determined to

a) The solubility of silver sulfate, Ag2SO4, in water has been determined to be 8.0 g/L. What is the solubility of silver sulfate in 0.800M of sodium sulfate, Na2SO4? = _____g/L b…

a) The solubility product, Ksp, of Al(OH)3 is 1.3 x 10-33. Calculate its solubil

a) The solubility product, Ksp, of Al(OH)3 is 1.3 x 10-33. Calculate its solubility (in g/L) in a solution of NaOH with a pH of 13.11. b) At 25.0?C, in a sealed container that has…

a) The water in a lake is found to have a toluene concentration of 1 µg/L. Calcu

a) The water in a lake is found to have a toluene concentration of 1 µg/L. Calculate the concentration at equilibrium in the air above the lake (µg/L) and the sediment in the lake…

a) There are several reagents that can be used to effect addition to a double bo

a) There are several reagents that can be used to effect addition to a double bond including: acid and water, oxymercuration–demercuration reagents, and hydroboration–oxidation re…

a) To optimize the reading of the file, we may store adjacent blocks, e.g., B1,

a) To optimize the reading of the file, we may store adjacent blocks, e.g., B1, B2, B3, …, on the same cylinder. Given the disk configuration above, how many blocks can be aligned…

a) True or False. According to the Hammond Postulate transition state structures

a) True or False. According to the Hammond Postulate transition state structures for endothermic reactions resemble those of the reactants. b) True or False. The kinetic product a…

a) Two reactants, A and B, were mixed and allowed to react. The concentration of

a) Two reactants, A and B, were mixed and allowed to react. The concentration of A was in large excess. The concentration of B was measured and t0.9 values (time required to reach…

a) Type up and save the function “secant” below exactly as is and save it among

a) Type up and save the function “secant” below exactly as is and save it among all your MATLAB work in your Mosaic account. Then type in this line in the main MATLAB command wind…

a) Use Table 18.a or Apendix C to calculate the Kb of the nitrite ion, NO2-? Sig

a) Use Table 18.a or Apendix C to calculate the Kb of the nitrite ion, NO2-? Sig Figs (b) What is Ka of the 2-hydroxyethylammonium ion, HOCH2CH2NH3+ (pKb of HOCH2CH2CH2NH2 = 4.49)…

a) Use the equation, dH = TdS + Vdp, divide by dp at constant temperature, and t

a) Use the equation, dH = TdS + Vdp, divide by dp at constant temperature, and the use one of Maxwell’s equation to derive the thermodynamic equation of state: b) Use the equation…

a) Use the equation, dH = TdS + Vdp, divide by dp at constant temperature, and t

a) Use the equation, dH = TdS + Vdp, divide by dp at constant temperature, and the use one of Maxwell’s equation to derive the thermodynamic equation of state: b) Use the equation…

a) Use the two-dimensional diffraction relationship n = d*sin(theta) to calculat

a) Use the two-dimensional diffraction relationship n = d*sin(theta) to calculate the groove spacing, d. Be careful with units, a good tip is to work in meters. b) Calculate the n…

a) Use what you know about titration curves to calculate the pKa for this first

a) Use what you know about titration curves to calculate the pKa for this first proton. b) What is Ka for this first proton? (also called Ka1) 1. Diprotic Acids and Bases Polyprot…

a) Using relational algebra laws, perform heuristic optimization on the query tr

a) Using relational algebra laws, perform heuristic optimization on the query trees above. Explain the optimizations (laws) that you apply. b) Using the database statistics given …

a) Warm-up question Using data from the Appendix, calculate ?G o (in kJ) at 65 o

a)Warm-up question Using data from the Appendix, calculate ?Go (in kJ) at 65 oC for the reaction: N2O(1 atm) + H2(1 atm) ? N2(1 atm) +H2O(l) (Recall, all gases at 1 atm for standa…

a) We define pH as pH = -log [H + ]; therefore, pH = -log (8.8*10 -7 ) = 6.055 (

a) We define pH as pH = -log [H+]; therefore, pH = -log (8.8*10-7) = 6.055 (ans). b) We know that [H+]*[OH-] = Kw = 1.0*10-14 where Kw is the ionic product of water. Use the relat…

a) What are the species present in a 3.0 M NH3 b) Qualitatively, what is the pH

a) What are the species present in a 3.0 M NH3 b) Qualitatively, what is the pH of this solution c) What reaction(s) might occur when this solution is added to a solution contaiin…

a) What are the two primary mechanisms of mass transfer (molecular transport)? b

a) What are the two primary mechanisms of mass transfer (molecular transport)? b) If ???? is positive, is species ?? being consumed or generated by the reaction? c) Are gas-phase …

a) What are the two primary mechanisms of mass transfer (molecular transport)? b

a) What are the two primary mechanisms of mass transfer (molecular transport)? b) If ???? is positive, is species ?? being consumed or generated by the reaction? c) Are gas-phase …