Chemistry concepts and calculations

1) As a city planner, you receive complaints from local residents about the safe

1) As a city planner, you receive complaints from local residents about the safety of nearby roads and streets. One complaint concerns a stop sign at the corner of Pine Street and…

1) As a technician in a large pharmaceutical research firm, you need to produce

1) As a technician in a large pharmaceutical research firm, you need to produce 300.mL of 1.00 Mpotassium dihydrogen phosphate buffer solution of pH = 6.76. The pKa of H2PO4? is 7…

1) As a technician in a large pharmaceutical research firm, you need to produce

1) As a technician in a large pharmaceutical research firm, you need to produce 450. mL of a potassium dihydrogen phosphate buffer solution of pH = 7.04. The pKa of H2PO4 is 7.21.…

1) Aspirin (C 9 H 8 O 4 ) is synthesized by mixing salicylic acid (C 7 H 6 O 3 )

1) Aspirin (C9H8O4) is synthesized by mixing salicylic acid (C7H6O3) with excess acetic anhydride (C4H6O3). The balanced equation is: C7H6O3 + C4H6O3 ------------> C9H8O4 + C2H…

1) Assign searchResult with a pointer to any instance of searchChar in personNam

1) Assign searchResult with a pointer to any instance of searchChar in personName. #include <stdio.h> #include <string.h> int main(void) { char personName[100] = "Albe…

1) Assignment Statements ? In general, values in a program are stored in the mem

1) Assignment Statements ? In general, values in a program are stored in the memory system, and when work is needed, these values are loaded into the registers and used in appropr…

1) Assume an air bubble had been in the buret tip when you took your first readi

1) Assume an air bubble had been in the buret tip when you took your first reading and it was replaced by NaOH during the course of the titration. Would your experimental value fo…

1) Assume that you mixed HCl and CuSO 4 solutions. If a reaction would have occu

1) Assume that you mixed HCl and CuSO4 solutions. If a reaction would have occured, write an equation for the reaction. If no reaction occurs, explain why. 2) Zn is less active th…

1) Assuming a uniform distribution of request sizes, what percentage of internal

1) Assuming a uniform distribution of request sizes, what percentage of internal fragmentation would we see on avg if the minimum allocation unit is 32 bytes and avg request size …

1) Assuming that you are limited to the standard glassware and equipment availab

1) Assuming that you are limited to the standard glassware and equipment available in the Chemistry lab room, write a procedure to determine the density of an oil. 2) In one stude…

1) Assuming the general trend for reactivity of metals across a row, predict whe

1) Assuming the general trend for reactivity of metals across a row, predict whether or not the following reactions will take place. a) Cr + FeCl3 b) Al +NaCl 2) for the following…

1) At a certain temperature the K sp of Ag 2 SO 4 is 1.06 x 10 -5 . What is the

1) At a certain temperature the Ksp of Ag2SO4 is 1.06 x 10-5. What is the molar soliubility of silver sulfate in water in units of M (mol/liter). Express your answer in scientific…

1) At a certain temperature, this reaction establishes an equilibrium with the g

1) At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g)+2B(g) = 4C(g) Kc=2.93*10^19 If, at this temperature, 1.50 mol …

1) At a pressure of 760 torr, formic acid (HCOOH; boiling point = 100.7 o C) and

1) At a pressure of 760 torr, formic acid (HCOOH; boiling point = 100.7 oC) and water (H2O; boiling point = 100.0 oC) form an azeotropic mixture, boiling at 107.1 oC, that is 77.5…

1) At constant volume, the heat of combustion of a particular compound is –3717.

1) At constant volume, the heat of combustion of a particular compound is –3717.0 kJ/mol. When 1.339 g of this compound (molar mass = 186.00 g/mol) was burned in a bomb calorimete…

1) At standard temperature and pressure (0 C and 1.00 atm ), 1.00 mol of an idea

1) At standard temperature and pressure (0 C and 1.00 atm ), 1.00 mol of an ideal gas occupies a volume of 22.4 L. What volume would the same amount of gas occupy at the same pres…

1) At standard temperature and pressure (0 C and 1.00 atm ), 1.00 mol of an idea

1) At standard temperature and pressure (0 C and 1.00 atm ), 1.00 mol of an ideal gas occupies a volume of 22.4 L. What volume would the same amount of gas occupy at the same pres…

1) At what angle (in degrees) must {111} planes of platinum (Pt) be exposed to a

1) At what angle (in degrees) must {111} planes of platinum (Pt) be exposed to a collimated beam of thee X-rays in order to obtain by diffraction monochromatic CrK radiation. 2) T…

1) At what pressure would a sample of gas occupy 8.96L if it occupies 3.04L at 4

1) At what pressure would a sample of gas occupy 8.96L if it occupies 3.04L at 4.16atm? (Assume constant temperature) 2) A sample of gas originally occupies 26.22 L at 0C. what is…

1) Atoms with which of the following electron configurations are readily able to

1) Atoms with which of the following electron configurations are readily able to form cations? I. ns2np3 II. ns2 III. ns2np5 a) III only b) I and II c) II and III d) I and III e) …

1) Automobile airbags are inflated upon a serious impact. The impact triggers th

1) Automobile airbags are inflated upon a serious impact. The impact triggers the following chemical reaction: 2 NaN3(s) ¾? 2 Na(s) + 3 N2(g) If an automobile airbag has a total v…

1) Ba-141 has a half life of 18.26 minutes and decays by first order kinetics. H

1) Ba-141 has a half life of 18.26 minutes and decays by first order kinetics. How many half lives will it take for a mole of Ba-141 to decay down to one atom? 2) I-131 decays by …

1) Back in the day, aluminum was a highly precious metal. It was first isolated

1) Back in the day, aluminum was a highly precious metal. It was first isolated by Hans Charistian Oersted (or possibly Friedrich Wohler, who believed Oersted to not have succeede…

1) Balance the chemical equation when aqueous ammonium phosphate and aqueous cal

1) Balance the chemical equation when aqueous ammonium phosphate and aqueous calcium choloride are mixed. What is the sum of the coefficeints? A. 8 B. 9 C. 11 D. 12 2) What mass o…

1) Balance the following equation (a) C+O2--->CO (B) KOH+H3PO4--->K3PO4+H2O (C)

1) Balance the following equation (a) C+O2--->CO (B) KOH+H3PO4--->K3PO4+H2O (C) N2+H2--->NH3 (D) K+H2O--->KOH+H2 2) Nitrogen and hydrogen react to form ammonia accordi…

1) Balance the following skeletal chemical equations. (Use the lowest possible c

1) Balance the following skeletal chemical equations. (Use the lowest possible coefficients.) (a) ------- CH4(g) + ------- O2(g) ------> CO2(g) + ------- H2O(g) (b) ----- Al(s)…

1) Balance the redox reaction occurring in basic solution. Cl2(g)+Mn2+(aq)MnO2(s

1) Balance the redox reaction occurring in basic solution.    Cl2(g)+Mn2+(aq)MnO2(s)+Cl(aq) Express your answer as a chemical equation. Identify all of the phases in your answer. …

1) Based on the location of each element on the periodic table, predict what ion

1)      Based on the location of each element on the periodic table, predict what ion of that element is most likely to form. a.       rubidium (Rb) b.      selenium (Se) c.      …

1) Based on the location of each element on the periodic table, predict what ion

1)      Based on the location of each element on the periodic table, predict what ion of that element is most likely to form. a.       rubidium (Rb) b.      selenium (Se) c.      …

1) Based on their position on the periodic table, which bond do you expect to be

1) Based on their position on the periodic table, which bond do you expect to be the most polar? Al---P Al---S Be--Cl P--Cl 2) Each scenario describes the properties of a substanc…

1) Below are some common foods and their pH values. Which ones are most likely t

1) Below are some common foods and their pH values. Which ones are most likely to cause "heartburn"? Explain why you made those choices. soda, 2.0-4.0; lemon juice, 2.00- 2.60; to…

1) Below you are presented with sets of quantum numbers: (n, l, m(l) , m(s) ). O

1) Below you are presented with sets of quantum numbers: (n, l, m(l) , m(s) ). Only one is a valid set. Which is it? A) (4,3,2,1) B) (3,3,2,1/2) C) (3,1,-1,-1/2) D) (2,0,0,0) E) (…

1) Below you are presented with sets of quantum numbers: (n, l, m(l) , m(s) ). O

1) Below you are presented with sets of quantum numbers: (n, l, m(l) , m(s) ). Only one is a valid set. Which is it? A) (4,3,2,1) B) (3,3,2,1/2) C) (3,1,-1,-1/2) D) (2,0,0,0) E) (…

1) Benzene is present in soil-water at a particular site where poplar trees are

1) Benzene is present in soil-water at a particular site where poplar trees are grown. Assume that equilibrium condition has been established between the plant roots and soil wate…

1) Benzene is present in soil-water at a particular site where poplar trees are

1) Benzene is present in soil-water at a particular site where poplar trees are grown. Assume that equilibrium condition has been established between the plant roots and soil wate…

1) Briefly describe how Rutherford\'s gold foil experiment changed the way we th

1) Briefly describe how Rutherford's gold foil experiment changed the way we think about the structure of the atom. Include the prevailing theory-our general understanding- of the…

1) Briefly describe how Rutherford\'s gold foil experiment changed the way we th

1) Briefly describe how Rutherford's gold foil experiment changed the way we think about the structure of the atom. Include the prevailing theory-our general understanding- of the…

1) Briefly explain why the pH of 1.0*10^-2 MHCl is different from that of 1.0*10

1) Briefly explain why the pH of 1.0*10^-2 MHCl is different from that of 1.0*10^-2M HC2H3O2? 2) Briefly explain why the pH change that resulted when you added 6M NaOH to the buff…

1) Bubbles of gas are produced when a solution of sodium hydrogen sulfite reacts

1) Bubbles of gas are produced when a solution of sodium hydrogen sulfite reacts with a solution nitric acid. 2) When solution of strontuim hydroxide and hydrochloride acid are mi…

1) Buffer capacity depends on two quantities. What are they? Buffer capacity dep

1) Buffer capacity depends on two quantities. What are they? Buffer capacity depends on two quantities. What are they? the range of pH values over which the solution can act as a …

1) Butane, C4H10, is a component of natural gas that is used as fuel for cigaret

1) Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O2(g)8CO2(g)…

1) C3H8 + 5 O2 ---> 3 CO2 + 4 H2O Now this balanced equation tells us most of wh

1) C3H8 + 5 O2 ---> 3 CO2 + 4 H2O Now this balanced equation tells us most of what we need to know. We need 1 mole of oxygen for every 5 moles of oxygen. Treating propane and o…

1) CH 3 SH reacts with CO according to the following unbalanced chemical equatio

1) CH3SH reacts with CO according to the following unbalanced chemical equation: CH3SH + CO CH3CO(SCH3) + H2S Calculate the mass in grams of the excess reagent remaining after the…

1) CNC Machine: Only bring your ANOVA to the exam. Four different feed rates wer

1) CNC Machine: Only bring your ANOVA to the exam. Four different feed rates were investigated in an experiment on a CNC machine producing a component part used in an aircraft aux…

1) CNC Machine: Only bring your ANOVA to the exam. Four different feed rates wer

1) CNC Machine: Only bring your ANOVA to the exam. Four different feed rates were investigated in an experiment on a CNC machine producing a component part used in an aircraft aux…

1) Ca2+ influx thru a channel that is activated by a change in the membrane pote

1) Ca2+ influx thru a channel that is activated by a change in the membrane potential across the plasma membrane is an example of a(n): Ligand gated channel Voltage-gated channel …

1) CaCl is a strong electrolyte which dissociates in aqueous solution according

1) CaCl is a strong electrolyte which dissociates in aqueous solution according to the following: CaCl2 Ca2+ + 2 cr 0.384 moles of CaCl2 is dissolved in 300 g of water at 180C. Th…

1) CaCl is a strong electrolyte which dissociates in aqueous solution according

1) CaCl is a strong electrolyte which dissociates in aqueous solution according to the following: CaCl2 Ca2+ + 2 cr 0.384 moles of CaCl2 is dissolved in 300 g of water at 180C. Th…

1) Calculate ? G ? r x n and E ? c e l l for a redox reaction with n = 4 that ha

1) Calculate ?G?rxn and E?cell for a redox reaction with n = 4 that has an equilibrium constant of K = 5.510?2. 2) A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+ hal…

1) Calculate Delta Srxn for 2Mg( s )+O2( g )?2MgO( s ) (Please show work) 2) Fir

1) Calculate Delta Srxn for 2Mg(s)+O2(g)?2MgO(s) (Please show work) 2) Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light gene…