Chemistry concepts and calculations

1. a) Assume we live in a Universe that is NOT expanding, but is static (staying

1. a) Assume we live in a Universe that is NOT expanding, but is static (staying the same size). Three galaxies (Galaxy Hubble, Galaxy Rubin, and Galaxy Einstein) are illustrated …

1. a) Calculate Kc for the following reaction if at equilibrium the [A] = .482 M

1. a) Calculate Kc for the following reaction if at equilibrium the [A] = .482 M , [B] = .482 M and the [C] = 1.08 M. A + B = 2C …

1. a) Calculate the moles of water produced when 0.1 mole of HCI reacts with 0.1

1. a) Calculate the moles of water produced when 0.1 mole of HCI reacts with 0.1 mole of NaOH. ( HCI + NaOH ---> H2O + NaCI ) b) If 0.5 moles of KOH are mixed with 1 mole of HN…

1. a) Calculate the reflex motion of the Sun (its radial velocity as it orbits a

1. a) Calculate the reflex motion of the Sun (its radial velocity as it orbits around the center of mass) due to the presence of Jupiter. Jupiter’s orbital period is 11.86 yr, ave…

1. a) DDT has a potency factor of 0.34 (kg-day/mg). For an incremental lifetime

1. a) DDT has a potency factor of 0.34 (kg-day/mg). For an incremental lifetime risk cancer risk of one in a million, what is the acceptable concentration in drinking water? Assum…

1. a) Fe 2+ (FAS) solution is titrated against 2.00 mL of 0.042 potassium dichro

1. a) Fe2+ (FAS) solution is titrated against 2.00 mL of 0.042 potassium dichromate. Volume of Fe2+ required to reach end point: 2.30 mL. Find the concentration of Fe2+ b) COD Det…

1. a) One mole of ice is warmed from 220 K to 330 K at a constant pressure of 1

1. a) One mole of ice is warmed from 220 K to 330 K at a constant pressure of 1 bar. Find the enthalpy change for this process. b) If we assume that the volume of the ice/water do…

1. a) One mole of ice is warmed from 220 K to 330 K at a constant pressure of 1

1. a) One mole of ice is warmed from 220 K to 330 K at a constant pressure of 1 bar. Find the enthalpy change for this process. b) If we assume that the volume of the ice/water do…

1. a) Polyamide b) Polyester c) Polyether d) Polyolefin e) Polyethylene 2. Which

1. a) Polyamide b) Polyester c) Polyether d) Polyolefin e) Polyethylene 2. Which is the best description for the following structural representation of an addition polymer? a) It …

1. a) Predict the behavior of all five compounds (biphenyl, benzophenone, ortho

1. a) Predict the behavior of all five compounds (biphenyl, benzophenone, ortho-dichlorobenzene, 1-naphthol, and benzhydrol (also called "benzohydrol") on both TLC (Thin Layer Chr…

1. a) The combustion of pentane produces heat according to the equation: C 5 H 1

1. a) The combustion of pentane produces heat according to the equation: C5H12 (l) + 8O2 (g) ? 5CO2 (g) + 6H2O (l) ?H°rxn = –3,510 kJ/mol How many grams of CO2 are produced per 2.…

1. a) The equilbrium constant for the water-gas shift reaction is 5.0 at 400 oC:

1. a) The equilbrium constant for the water-gas shift reaction is 5.0 at 400 oC: CO(g) + H2O(g) ? CO2(g) + H2(g) Determine Qc if the following amounts (in moles) of each component…

1. a) The equilbrium constant for the water-gas shift reaction is 5.0 at 400 oC:

1. a) The equilbrium constant for the water-gas shift reaction is 5.0 at 400 oC: CO(g) + H2O(g) ? CO2(g) + H2(g) Determine Qc if the following amounts (in moles) of each component…

1. a) The pH of a 0.06 M weak monoprotic acid is 3.44. What is the K a for this

1. a) The pH of a 0.06 M weak monoprotic acid is 3.44. What is the Ka for this weak monoprotic acid? b) Calculate the pH for a 0.060 M hydrocyanic acid (HCN) solution where the Ka…

1. a) To prepare her Beer\'s Law plot Susan followed instructions and read the a

1. a) To prepare her Beer's Law plot Susan followed instructions and read the absorbances of her standard solutions promptly after they were prepared. Anna prepared her standard s…

1. a) What is the DP in a) PTFE with an average molecular weight of 50,000 g/mol

1. a) What is the DP in a) PTFE with an average molecular weight of 50,000 g/mol b) with an average molecular weight of 70,980 g/mol? If you want a polymer that is translucent,…

1. a) What is the effect of the concentration of an electrolyte on the conductan

1. a) What is the effect of the concentration of an electrolyte on the conductance ( current)? b). What is the cause of the differences in the conductances ( currents) of isomolar…

1. a) Which atoms are nucleophilic centers? etc.. For each of the reactions show

1. a) Which atoms are nucleophilic centers? etc.. For each of the reactions shown below use the atom numbers to answer questions about the reactants. To indicate an acidic proton,…

1. a) Which of the metals ranked in part D is most easily oxidized? moones um (W

1. a) Which of the metals ranked in part D is most easily oxidized? moones um (Wal gels oxiditted Pk easiest b) Give the formula for the metal oxide which would be expected to be …

1. a) Which one of the following is expected to have the highest vapor pressure

1. a) Which one of the following is expected to have the highest vapor pressure at room temperature? ( Ethanol bp = 78 degrees Celsius, Methanol bp =65 degrees Celsius, Diethyl et…

1. a) Write a net ionic equation for the neutralization of NaOH by a component o

1. a) Write a net ionic equation for the neutralization of NaOH by a component of a buffer buffer = .5M HC2H3O2 / .5M NaC2H3O2 (mixture of both) b) [then] Write a net ionic equait…

1. a) Write a net ionic equation for the precipitation of lead (II) iodide. b) W

1. a) Write a net ionic equation for the precipitation of lead (II) iodide. b) Write the net ionic equation for copper+silver nitrate c)Write an equation for the combustion of C4H…

1. a) Write the balanced equation for the combustion of propane, C3Ha. b) How ma

1. a) Write the balanced equation for the combustion of propane, C3Ha. b) How many grams of water are produced when 60.0 grams of propane are burned? c) How many moles of oxygen a…

1. a) Write the equation for the esterification reaction between ethanol and ace

1. a) Write the equation for the esterification reaction between ethanol and acetic acid (ethanoic acid) b) Write the equation for the esterification reaction between ethanol and…

1. a) no change in the equilibrium, b) equilibrium shifts towards reactants. 2.

1. a) no change in the equilibrium, b) equilibrium shifts towards reactants. 2. a) equilibrium shifts towards products, b) equilibrium shifts towards products. 3. a) equilibrium s…

1. a) no change in the equilibrium, b) equilibrium shifts towards reactants. 2.

1. a) no change in the equilibrium, b) equilibrium shifts towards reactants. 2. a) equilibrium shifts towards products, b) equilibrium shifts towards products. 3. a) equilibrium s…

1. a)What is the empirical formula of a compound that has 55.3% K, 14.6% P, and

1. a)What is the empirical formula of a compound that has 55.3% K, 14.6% P, and 30.1% O. b) What is the molecular formula of a compound with empirical formula CH2 and molar mass 1…

1. a. 0.0500 M of AgNO3 is used to titrate a 25.00-mL containing 0.1000 M sodium

1. a. 0.0500 M of AgNO3 is used to titrate a 25.00-mL containing 0.1000 M sodium chloride (NaCl) and 0.05000 M potassium iodide (KI), what is the pAg of the solution after 15.00 m…

1. a. A photon is absorbed by a hydrogen atom causing an electron to become exci

1. a. A photon is absorbed by a hydrogen atom causing an electron to become excited (nf = 6) from the ground state electron configuration. What is the energy change of the electro…

1. a. Add the following operation to the class stackType. void reverseStack(stac

1. a. Add the following operation to the class stackType. void reverseStack(stackType<Type> &otherStack); This operation copies the elements of a stack in revers…

1. a. At what pressure does the first vapor bubble form? (in mmHg) b. What is it

1. a. At what pressure does the first vapor bubble form? (in mmHg) b. What is its composition? (mol benzene/mol) 2. a. At what pressure does the last droplet of liquid evaporate? …

1. a. Based on your knowledge of periodic trends, provide an explanation why met

1. a. Based on your knowledge of periodic trends, provide an explanation why metals form cations. b. Based on your knowledge of periodic trends, provide an explanation why nonmeta…

1. a. Based on your knowledge of periodic trends, provide an explanation why met

1. a. Based on your knowledge of periodic trends, provide an explanation why metals form cations. b. Based on your knowledge of periodic trends, provide an explanation why nonmeta…

1. a. Calculate the initial rates for Experiments 1, 2, and 3 from ?[S 2 O 8 -2

1. a. Calculate the initial rates for Experiments 1, 2, and 3 from ?[S2O8-2]/?t. Use mean elapsed times. Give correct units. b. Obtain the reaction…

1. a. Calculate the initial rates for Experiments 1, 2, and 3 from ?[S 2 O 8 -2

1. a. Calculate the initial rates for Experiments 1, 2, and 3 from ?[S2O8-2]/?t. Use mean elapsed times. Give correct units. b. Obtain the reaction…

1. a. Calculate the molar mass of oxalic acid dihydrate H.CO 2H2O. Remember that

1. a. Calculate the molar mass of oxalic acid dihydrate H.CO 2H2O. Remember that the water molecules in a hydrate are part of the crystal structure and must be included when calcu…

1. a. De%uFB01ne the analyte in a titration. b. Is the indicator generally added

1. a. De%uFB01ne the analyte in a titration. b. Is the indicator generally added to the titrant or the analyte in a titration? 2. a. What is the primary standard used in this expe…

1. a. How do you represent chemical reactions by using chemical equations? Pleas

1. a. How do you represent chemical reactions by using chemical equations? Please provide an example. b. How do you calculate the amount of energy released/absorbed in a chemical …

1. a. How many milliliters of O.0998 M NaOH are required to \"neutralize\" (reac

1. a. How many milliliters of O.0998 M NaOH are required to "neutralize" (react completely) with 0.3052 g of benzoic acid, C6HsCOOH, (Molar mass = 122.12g/mol). b. What is the pH …

1. a. If this esterification reaction is reversible (under equilibrium) what gen

1. a. If this esterification reaction is reversible (under equilibrium) what general chemistry principle allows us to shift the equilibrium in the direction of our desired product…

1. a. N2 + 3H2 -> 2 NH3 For 0.75 mole of NH3 mole of of N2 required = mole of NH

1. a. N2 + 3H2 -> 2 NH3 For 0.75 mole of NH3 mole of of N2 required = mole of NH3/2 =0.75/2 = .375 mole of of H2 required = mole of NH3 * 1.5 = .75 * 1.5 = 1.125 b. 2CH3OH + …

1. a. The compound X 3 Y is 35.0% X. What is the molar mass of Y if the molar ma

1. a. The compound X3Y is 35.0% X. What is the molar mass of Y if the molar mass of X is 62.4 g/mol? b. What is the atomic mass of element X if 9.94 g XCl3 contains 3.26 g X? c. A…

1. a. Using Beer-Lambert equation (A=eCL) to explain how absorbance is affected

1. a. Using Beer-Lambert equation (A=eCL) to explain how absorbance is affected by changes in concentration and in the pathlength. b. How to use the molecular structure to predict…

1. a. What is the first law of thermodynamics? b. What is work and what is heat?

1. a. What is the first law of thermodynamics? b. What is work and what is heat? c. How is the internal energy of a system altered? d. For each of the following energy transfers, …

1. a. What is the pH of a solution formed by combining 50.00 mL of a 0.0855 M ac

1. a. What is the pH of a solution formed by combining 50.00 mL of a 0.0855 M acetic acid solution, 25.00 mL of 0.1061 M NaOH solution and 25.00 mL of deionized water? Show your w…

1. a. Would you float more easily (ie. with less of your body immersed) in water

1. a. Would you float more easily (ie. with less of your body immersed) in water on the moon than on earth? Explain your answer fully b. A glass beaker, filled to the brim with wa…

1. a. Write the balanced net ionic equation for the formation of iodine when a h

1. a. Write the balanced net ionic equation for the formation of iodine when a hypochlorite containing cleanser reacts with a solution of Kl. b. How many moles of hypachlorous aci…

1. a. You set up a titration experiment in lab, in order to determine the molari

1. a. You set up a titration experiment in lab, in order to determine the molarity of a nitric acid solution, HNO3 (aq). A flask containing 14.92 mL of a nitric acid solution was …

1. a. You set up a titration experiment in lab, in order to determine the molari

1. a. You set up a titration experiment in lab, in order to determine the molarity of a nitric acid solution, HNO3 (aq). A flask containing 14.92 mL of a nitric acid solution was …

1. a. list three specific examples of why a reduction of stratospheric ozone is

1. a. list three specific examples of why a reduction of stratospheric ozone is a danger to our planet? (show your works) b. what wavelength range (and in what region of the e…

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