Chemistry concepts and calculations

1. The mole fraction of oa in air is 0.21 at 20°c. The Henry\'s Law constant for

1. The mole fraction of oa in air is 0.21 at 20°c. The Henry's Law constant for Oa at this temperature is k 1.38 x 10- M/atm. a. Compute the partial pressure of 0a when the total …

1. The mole fraction of oa in air is 0.21 at 20°c. The Henry\'s Law constant for

1. The mole fraction of oa in air is 0.21 at 20°c. The Henry's Law constant for Oa at this temperature is k 1.38 x 10- M/atm. a. Compute the partial pressure of 0a when the total …

1. The mythic hero is usually... A. half god B. half Greek C. a spiritual or mor

1. The mythic hero is usually... A. half god B. half Greek C. a spiritual or moral leader D. half beast 2. When Orpheus confronts Hades and Persephone, he... A. educes them to tea…

1. The name of a structure is called the . 2. An advantage of structures over ar

1. The name of a structure is called the . 2. An advantage of structures over arrays is that structures allow one to use items of data types, whereas arrays do not. 3. One structu…

1. The neutralization of HC2H3O2(aq) by NaOH(aq) can be considered to be the sum

1. The neutralization of HC2H3O2(aq) by NaOH(aq) can be considered to be the sum of the neutralization of H+(aq) by OH- and ionization of HC2H3O2 (HC2H3O2<==> H+ + C2H3O2). …

1. The normal boiling point of cyclohexane is 81.0 degree C. What is the vapor p

1. The normal boiling point of cyclohexane is 81.0 degree C. What is the vapor pressure of cyclohexane at 81.0 degree C? 2. What effect would a decrease or increase in barometric …

1. The normal boiling point of ethanol is 78.3°C and at this temperature, D H va

1. The normal boiling point of ethanol is 78.3°C and at this temperature, DHvap = 38.9kJ/mol. a) To what value must P be reduced to if we want to boil ethanol at 25°C in a vacuum …

1. The number of C- O bonds is increased so this is an oxidation reaction 2. For

1. The number of C- O bonds is increased so this is an oxidation reaction 2. For the second compound you have to pay attention to the carbon atoms that are in in the double bond 1…

1. The number of atoms on each side of the following reaction is CH4+ 202 C02 2H

1. The number of atoms on each side of the following reaction is CH4+ 202 C02 2H20 is a) 5 b) 6 d) 9 2. The total mass of the products in the reaction in question #1 is a) 80 gram…

1. The number of molecules in 1 atm of gas at constant pressure and temperature

1. The number of molecules in 1 atm of gas at constant pressure and temperature is identical, regardless of the identity of the molecules in the gas. Which of the following other …

1. The observation that the absorbance is linearly proportional to the concentra

1. The observation that the absorbance is linearly proportional to the concentration of dye is a statement of which law? 2. For this question, note that you diluted your prepared …

1. The optical rotation of a sample of 2-butanol is measured to be obs = -0.35º.

1. The optical rotation of a sample of 2-butanol is measured to be obs = -0.35º. The specific rotation for pure (+)-2-butanol is []D = 13.52° ml/g dm. If the cell path length was …

1. The overall K f for the complex ion Ag(NH 3 ) 2 + is 1.7 10 7 . The K sp for

1. The overall Kf for the complex ion Ag(NH3)2+ is 1.7 107. The Ksp for AgI is 1.5 1016. What is the molar solubility of AgI in a solution that is 2.0 M in NH3? [A] 1.3X10^-3 [B] …

1. The oxidation of benzyl alcohol with the (bpy)CuTEMPO system studied can be c

1. The oxidation of benzyl alcohol with the (bpy)CuTEMPO system studied can be complete in three hours, while oxidation of octanol requires upwards of 20 hours to achieve comparab…

1. The oxygen atom in a carbonyl group is _____ the carbon atom. more electroneg

1. The oxygen atom in a carbonyl group is _____ the carbon atom. more electronegative than identical in electronegativity to less electronegative than more soluble than 2. Which o…

1. The pH electrode uses a glass bulb to provide protonation sites for the solut

1. The pH electrode uses a glass bulb to provide protonation sites for the solution. a. True b. False 2. How does one write the Ksp expression? 3. Leonardo da Vinci significantly …

1. The pH of a 0.10 HCN solution is 5.2. At equilibrium, a. What is the [H30*] i

1. The pH of a 0.10 HCN solution is 5.2. At equilibrium, a. What is the [H30*] in that solution. b. What is [CN ]? c. What is the [HCN]? d. What is the value of Ka for HCN? 2. For…

1. The pH of a 0.42M dimethylamine solution is: A. 2.5 B.1.80 C.1.7 D.12.2 2.The

1. The pH of a 0.42M dimethylamine solution is: A. 2.5 B.1.80 C.1.7 D.12.2 2.The pH of a buffer solution composed of 0.020M HClO and 0.014M NaClO is: A.7.37 B. 7.52 C. 7.68 3.When…

1. The pH of a 9.75×10 -2 M solution of a weak monoprotic acid is 1.40. Calculat

1. The pH of a 9.75×10-2 M solution of a weak monoprotic acid is 1.40. Calculate the percent dissociation of the acid to 3 significant figures. 2. The pH of a 5.19×10-2 M solution…

1. The pH of a solution made by the addition of 45mL of 0.100 M NaOH and 50 mL o

1. The pH of a solution made by the addition of 45mL of 0.100 M NaOH and 50 mL of a 0.100M weak acid is determined to be 4.8. What is the Ka of the acid?' (my answer for this is p…

1. The pH of a solution prepared by dissolving 0.350 mol of acid in 1.00L of 1.1

1. The pH of a solution prepared by dissolving 0.350 mol of acid in 1.00L of 1.10M of conjugate base is ________. The Kb for the conjugate base is 5.40 x 10^-4. (Assume the final …

1. The pH of natural water and the effects of global warming a) It is a well-kno

1. The pH of natural water and the effects of global warming a) It is a well-known fact that the increase in atmospheric CO2 concentration will result in global warming. Such effe…

1. The partial pressure of O2 in a sample of air on a mountain top is 115 mmHg.

1. The partial pressure of O2 in a sample of air on a mountain top is 115 mmHg. The oxygen makes up 21% of the gas in the atmosphere. What is the total atmospheric pressure on the…

1. The partial pressure of O2 in a sample of air on a mountain top is 115 mmHg.

1. The partial pressure of O2 in a sample of air on a mountain top is 115 mmHg. The oxygen makes up 21% of the gas in the atmosphere. What is the total atmospheric pressure on the…

1. The phosphoric acid in a 100.00-mL sample of Cola drink was titrated with 0.1

1. The phosphoric acid in a 100.00-mL sample of Cola drink was titrated with 0.1025 M NaOH. If the first equivalence point occurred after 16.11 mL of base was added, and the secon…

1. The phosphorie acid in a 100.00-mL sample of Cola drink was titrated with 0 1

1. The phosphorie acid in a 100.00-mL sample of Cola drink was titrated with 0 1025 M NaOH. If the first equivalence point occurred after 16.11 mL of base was added, and the secon…

1. The photoelectric effect for a certain alloy has a threshold frequency of 5.8

1. The photoelectric effect for a certain alloy has a threshold frequency of 5.80 x 1014 Hz. For light of this frequency, find the energy of one mole of photons (in kJ). 2. An ele…

1. The photosynthesis reaction is: 6 CO 2 (g) + 6 H 2 O (l) ßà C 6 H 12 O 6 (s)

1.       The photosynthesis reaction is: 6 CO2 (g) + 6 H2O (l) ßà C6H12O6(s) + 6 O2 (g) If the reaction is at equilibrium, state the effect that each of the following changes will…

1. The polarity of a molecule depends on the polarity of the bonds within the mo

1.      The polarity of a molecule depends on the polarity of the bonds within the molecules as well as the shape of the molecule. All of the following statements are true concern…

1. The possible components of your mixture are unreacted ferrocene and the subst

1. The possible components of your mixture are unreacted ferrocene and the substituted ferrocene product(s) of your reaction, which should travel the farthest up the TLC plate (hi…

1. The potential of an iron electrode when polarized as cathode at 0.001 A/cm2 i

1. The potential of an iron electrode when polarized as cathode at 0.001 A/cm2 is-0.916 V versus IN calomel half-cell. The pH of the elec- trolyte is 4.0. What is the value of the…

1. The printed label on a bottle of commercial vinegar states that the acetic ac

1. The printed label on a bottle of commercial vinegar states that the acetic acid concentration is 5%. (a) If the manufacturer had reported two significant figures int he concent…

1. The printed label on a bottle of commercial vinegar states that the acetic ac

1. The printed label on a bottle of commercial vinegar states that the acetic acid concentration is 5%. (a) If the manufacturer had reported two significant figures int he concent…

1. The printed label on a bottle of commercial vinegar states that the acetic ac

1. The printed label on a bottle of commercial vinegar states that the acetic acid concentration is 5%. (a) If the manufacturer had reported two significant figures int he concent…

1. The printed label on a bottle of commercial vinegar states that the acetic ac

1. The printed label on a bottle of commercial vinegar states that the acetic acid concentration is 5%. (a) If the manufacturer had reported two significant figures int he concent…

1. The printed label on a bottle of commercial vinegar states that the acetic ac

1. The printed label on a bottle of commercial vinegar states that the acetic acid concentration is 5%. (a) If the manufacturer had reported two significant figures int he concent…

1. The printed label on a bottle of commercial vinegar states that the acetic ac

1. The printed label on a bottle of commercial vinegar states that the acetic acid concentration is 5%. (Assume % is weight solute/volume solution) (a) If the manufacturer had rep…

1. The problem below concern CACL2. a. 0.135 gram of cacl2 is dissolved to 250 m

1. The problem below concern CACL2. a. 0.135 gram of cacl2 is dissolved to 250 ml. What is the prepared molarity of the solution b. what is the equilibrium molarity of chloride an…

1. The problem below concern CACL2. a. 0.135 gram of cacl2 is dissolved to 250 m

1. The problem below concern CACL2. a. 0.135 gram of cacl2 is dissolved to 250 ml. What is the prepared molarity of the solution b. what is the equilibrium molarity of chloride an…

1. The problem statement,all variables and given/known data The specific gravity

1. The problem statement,all variables and given/known data The specific gravity of nitrobenzene is 1.20. a) Calculate the mass in kg of 250 litres of nitrobenzene. b) Calculate t…

1. The procedure in the manual calls for 1 (molar) equivalent of dibenzyl ketone

1. The procedure in the manual calls for 1 (molar) equivalent of dibenzyl ketone relative to the amount of benzil that you made in step 1 (i.e. 1 mole of dibenzyl ketone for every…

1. The products for the following: NH4Cl(aq) + AgNO3 (aq) ? A. AgCl(aq) + NH4NO3

1. The products for the following: NH4Cl(aq) + AgNO3 (aq) ? A. AgCl(aq) + NH4NO3(s) B. AgCl(s) + NH4NO3(aq) C. no reaction D. none of these .......................................…

1. The program in “proj06b.py” will produce data files which can serve as the in

1. The program in “proj06b.py” will produce data files which can serve as the input file for the program in Part A. a) The program will always read from “data_full.txt” (it will n…

1. The prototype lattic for gallium nitride (GaN) is the _________ lattice. 2. I

1. The prototype lattic for gallium nitride (GaN) is the _________ lattice. 2. III-V and II-VI semiconductors are known as ____________ semiconductors. 3. The drift velocity of a …

1. The prototype lattic for gallium nitride (GaN) is the _________ lattice. 2. I

1. The prototype lattic for gallium nitride (GaN) is the _________ lattice. 2. III-V and II-VI semiconductors are known as ____________ semiconductors. 3. The drift velocity of a …

1. The rate constant of a reaction increases when: check all that apply. Select

1. The rate constant of a reaction increases when: check all that apply. Select one or more: a. the concentration decreases b. the activation energy decreases c. the Temperature i…

1. The rate constants for the reaction 2 N2O5(g) 4 NO2(g) + O2(g) is measured at

1. The rate constants for the reaction 2 N2O5(g) 4 NO2(g) + O2(g) is measured at two temperatures: Show your calculations and show the units a) What is the activation energy (in k…

1. The rate law for a certain reaction is second order with respect to one of th

1. The rate law for a certain reaction is second order with respect to one of the reactants, R. Suppose you study this reaction, observing the absorbance of light at the analytica…

1. The rate law for a certain reaction is second order with respect to one of th

1. The rate law for a certain reaction is second order with respect to one of the reactants, R. Suppose you study this reaction, observing the absorbance of light at the analytica…

1. The rate law for a generic reaction is rate = k[A] 2 [B]. This rate law is va

1. The rate law for a generic reaction is rate = k[A]2[B]. This rate law is valid .... (choose all that apply) for any temperature at which the reaction is performed. with any con…