Chemistry concepts and calculations

1. The H for dissolving 1 mol of KOH in water is negative. What happens when you

1. The H for dissolving 1 mol of KOH in water is negative. What happens when you dissolve KOH in water? Select all the correct answers from the list below: a. The temperature of t…

1. The Harrisonburg Rockingham wastewater treatment plant discharges 12 million

1. The Harrisonburg Rockingham wastewater treatment plant discharges 12 million gallons per day to the North River. Upstream of the discharge, the North River flows at 235 million…

1. The Human Body is said to contain approximately 50.0 grams of DNA in the enti

1. The Human Body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in one strand of DNA is approximately 3.0*10^6, and the avera…

1. The Hvap of a certain compound is 39.46 kJ·mol–1 and its Svap is 58.87 J·mol–

1. The Hvap of a certain compound is 39.46 kJ·mol–1 and its Svap is 58.87 J·mol–1·K–1. What is the boiling point of this compound? 2. The molar heat capacity for carbon monoxide a…

1. The J = 0 J =1 transition of carbon monoxide has been measured at 3.842 cm a.

1. The J = 0 J =1 transition of carbon monoxide has been measured at 3.842 cm a. Convert this value to joules. b. Calculate the wavelength of the photon. c. In what region of the …

1. The K a of proline is 2.5 × 10 – 11 in water, 2.8 × 10 – 11 in an aqueous sol

1. The Ka of proline is 2.5 × 10–11 in water, 2.8 × 10–11 in an aqueous solution that is 28% ethanol, and 1.66 × 10–8 in 37% aqueous formaldehyde at 25°C. a. In which solvent is p…

1. The K for FeO is 10* We mis two soutions of oqual volurne, cee containing 10

1. The K for FeO is 10* We mis two soutions of oqual volurne, cee containing 10 M10, ons at 25"C. Which one of the follorwing a. A precipitate forms,because QK b. No precipitate f…

1. The K sp of copper (II) hydroxide is 4.8 x 10-20. What is the molar solubilit

1. The Ksp of copper (II) hydroxide is 4.8 x 10-20. What is the molar solubility of Cu(OH)2? 2. Sodium hydroxide is soluble in water according to the following reaction: NaOH (s) …

1. The K sp of silver chloride is 1.8 x 10-10. What is the molar solubility of A

1. The Ksp of silver chloride is 1.8 x 10-10. What is the molar solubility of AgCl? 2. Magnesium chloride is soluble in water according to the following reaction: MgCl2 (s) Mg2+ (…

1. The Ka of benzoic acid 1x10^-5. Which of the following would you choose as a

1. The Ka of benzoic acid 1x10^-5. Which of the following would you choose as a pH= 4.0 buffer? a. A 1.0 M solution of benzoic acid b. A 1.0 L solution containing 1.0 mole of benz…

1. The Kg expression for Ag S is not listed The value of Kap of Agcl is 1.8 x 1o

1. The Kg expression for Ag S is not listed The value of Kap of Agcl is 1.8 x 1ois What would be the molar concentration of A AgC1 in pure water is and CT when placed in contact w…

1. The Ksp for AgCl is 1.6 x 10-10 (a) What is the molar solubility of AgCl? (b)

1. The Ksp for AgCl is 1.6 x 10-10 (a) What is the molar solubility of AgCl? (b) What is the solubility in g/L solution? 2. The Ksp of Ag2CO3 is 8.1 x 10-12 (a) What is the molar …

1. The Ksp for AgCl is 1.6 x 10-10 (a) What is the molar solubility of AgCl? (b)

1. The Ksp for AgCl is 1.6 x 10-10 (a) What is the molar solubility of AgCl? (b) What is the solubility in g/L solution? 2. The Ksp of Ag2CO3 is 8.1 x 10-12 (a) What is the molar …

1. The Ksp is important because it can be used to calculate the concentrations o

1.   The Ksp is important because it can be used to calculate the concentrations of the ions in a saturated solution. For a solution of silver (I) chloride A.   Write the expressi…

1. The Ksp of Bi(OH)3 is 3.0*10^-36 , and the Ksp of Zn(OH)2 is 3*10^-17 . a) Ca

1. The Ksp of Bi(OH)3 is 3.0*10^-36 , and the Ksp of Zn(OH)2 is 3*10^-17 . a) Can Bi3+ be separated from Zn2+ by the addition of an NaOH solution to an acidic solution that contai…

1. The Marquis CST reagent is applied to an unknown drug and the solution turns

1. The Marquis CST reagent is applied to an unknown drug and the solution turns green. Next, Cobalt Thiocyanate reagent is applied and the solution turns reddish-orange. For the s…

1. The Prandtl number, Ner, is a dimensionless group important in heat transfer

1. The Prandtl number, Ner, is a dimensionless group important in heat transfer calculations and defined as Gm/k where G is the heat capacity of a fluid, m is the fluid viscosity,…

1. The \"equilibrium condition\" of a chemical reaction is in no way related to

1. The "equilibrium condition" of a chemical reaction is in no way related to temperature. True or False 2. Of the two reactions whose equilibrium constants are 0.003 and 30, the …

1. The \"grain\" unit of mass is commonly used to define the amount of aspirin i

1. The "grain" unit of mass is commonly used to define the amount of aspirin in a commercial tablet. What is the mass (in grams) of grain of aspirin? 2. What is one of the most co…

1. The absorption spectra of ions have been used to identify the presence of the

1. The absorption spectra of ions have been used to identify the presence of the elements in the atmospheres of the sun and other stars. What is the wavelength of light (in nm) th…

1. The activation energy for the denaturation of a protein is 311.0 kJ/mol. At w

1. The activation energy for the denaturation of a protein is 311.0 kJ/mol. At what temperature will the rate of denaturation be 19 percent greater than its rate at 25.00°C? _____…

1. The active catalyst in this experiment was generated from the redox reaction

1. The active catalyst in this experiment was generated from the redox reaction of chloroplatinic acid with sodium borohydride. Please review redox reactions and oxidation number …

1. The active ingredient in Tylenol is acetaminophen. Suppose you had a mixture

1. The active ingredient in Tylenol is acetaminophen. Suppose you had a mixture of acetaminophen and sodium chloride and wanted to separate it. Acetaminophen is soluble in ethyl a…

1. The active ingredient in many commercial antifreezes is ethylene glycol. If y

1. The active ingredient in many commercial antifreezes is ethylene glycol. If you wish to protect your radiator down to -25 degrees Fahrenheit, how many grams of ethylene glycol …

1. The active ingredient in many commercial antifreezes is ethylene glycol. If y

1. The active ingredient in many commercial antifreezes is ethylene glycol. If you wish to protect your radiator down to -25 degrees Fahrenheit, how many grams of ethylene glycol …

1. The addition of 3.27 g of Ba(OH) 2 · 8 H 2 O to a solution of 1.14 g of NH 4

1. The addition of 3.27 g of Ba(OH)2 · 8 H2O to a solution of 1.14 g of NH4SCN in 175 g of water in a calorimeter caused the temperature to fall by 4.9°C. Assuming the specific he…

1. The aqueous solution with the highest pH is: Select one: a. 0.1 M HCl. c. 0.1

1. The aqueous solution with the highest pH is: Select one: a. 0.1 M HCl. c. 0.1 M formic acid (pKa = 3.75). d. 0.1 M NaOH. 2. The variable component of the Henderson-Hasselbalch …

1. The aqueous solution with the highest pH is: Select one: a. 0.1 M HCl. c. 0.1

1. The aqueous solution with the highest pH is: Select one: a. 0.1 M HCl. c. 0.1 M formic acid (pKa = 3.75). d. 0.1 M NaOH. 2. The variable component of the Henderson-Hasselbalch …

1. The assigned voltages for the Mg/Mg 2+ and Fe/Fe 2+ will deviate from expecte

1. The assigned voltages for the Mg/Mg2+ and Fe/Fe2+ will deviate from expected values due to impurities in the Mg strip and the Fe2+ solution, so consider the other half cells on…

1. The atomic mass unit is presently based on assigning a mass of exactly 12 amu

1.The atomic mass unit is presently based on assigning a mass of exactly 12 amu to: (a) an atom of carbon isotope 13C      (b) an atom of carbon isotope 12C     (c) all carbon ato…

1. The average atomic weight of copper, which has two naturally occurring isotop

1. The average atomic weight of copper, which has two naturally occurring isotopes, is 63.5. of the isotopes has an atomic weight of 62.9 amu and constitutes 69.1% of the copper i…

1. The average molecular velocity of gas molecules in Kinetic Theory is I have t

1. The average molecular velocity of gas molecules in Kinetic Theory is I have two balloons of the same kind. I fill both balloons to the same pressure and temperature, one with h…

1. The average weight of one hydrogen atom is: a. 1.008 g b. 1.008 amu c. 1.008

1. The average weight of one hydrogen atom is: a. 1.008 g b. 1.008 amu c. 1.008 mol d. 1.008 lb e. None of the above 2. The average weight of one mole of hydrogen atoms is: a. 1.0…

1. The average weight of one hydrogen atom is: a. 1.008 g b. 1.008 amu c. 1.008

1. The average weight of one hydrogen atom is: a. 1.008 g b. 1.008 amu c. 1.008 mol d. 1.008 lb e. None of the above 2. The average weight of one mole of hydrogen atoms is: a. 1.0…

1. The background section lists observations can indicate that a chemical reacti

1. The background section lists observations can indicate that a chemical reaction has occurred Using your observations recorded during lab (p. 10), what did you observe that woul…

1. The background section lists observations can indicate that a chemical reacti

1. The background section lists observations can indicate that a chemical reaction has occurred. Using your observations recorded during lab (p. 10), what did you observe that wou…

1. The balanced chemical equation for the combustion of methane is: CH4(g) + 2 O

1. The balanced chemical equation for the combustion of methane is: CH4(g) + 2 O2(g) ––––> CO2(g) + 2 H2O(g) Which of the following statements concerning this equation is/are c…

1. The balanced overall equation for: Fe2+(aq) + Br-(aq) ? Fe(s) + Br2(g) A. 2Fe

1. The balanced overall equation for:  Fe2+(aq) + Br-(aq) ? Fe(s)  +  Br2(g)                 A.            2Fe2+(aq) + 6Br-(aq) ? 2Fe(s)  + 3Br2(g)                 B.             …

1. The ball and stick model shows the stacking of the a-b planes of SiC along th

1. The ball and stick model shows the stacking of the a-b planes of SiC along the vertical direction and the dotted lines depict the unit cell stacking. (a) What is the hybridizat…

1. The basis of the VSEPR model of molecular bonding is a) regions of electron d

1.        The basis of the VSEPR model of molecular bonding is a) regions of electron density on an atom will organize themselves so as to maximize s-character. B) regions of elec…

1. The biodiesel formation reaction is carried out in a plug flow reactor. Oil i

1. The biodiesel formation reaction is carried out in a plug flow reactor. Oil is fed at a flowrate of 10 mol/s. Methanol is fed at a flowrate of 30 mol/s. Determine the volume of…

1. The body of a do/while loop is guaranteed to execute at least once. 2. Write

1. The body of a do/while loop is guaranteed to execute at least once. 2. Write a small, complete program that will compile and, when run, will output and count the number of even…

1. The boiler produces saturated vapor at 285 K and 0.02MPa 2. The compressor ha

1. The boiler produces saturated vapor at 285 K and 0.02MPa 2. The compressor has an efficiency of 70% 3. The condenser produces saturated liquid at 305 K and 0.09 MPa. The refrig…

1. The boiling point constant and freezing point depression constant of water ar

1. The boiling point constant and freezing point depression constant of water are given below: Kt (K mola') 1.85 KA (K molar) 0.51 T, (k) 1 373 K or 100 C Water | 273 Kor 0 C If a…

1. The boiling point constant and freezing point depression constant of water ar

1. The boiling point constant and freezing point depression constant of water are given below: Kt (K mola') 1.85 KA (K molar) 0.51 T, (k) 1 373 K or 100 C Water | 273 Kor 0 C If a…

1. The book suggests the follow method to detect a dictionary attack on the logi

1. The book suggests the follow method to detect a dictionary attack on the login system Let A(k) be the number of failed login attempts during the kth 5-minute period. Let q(k) =…

1. The cabin pressure has just dropped on a fighter jet. The pressure gauge says

1. The cabin pressure has just dropped on a fighter jet. The pressure gauge says 633 torr. Anytime the cabin pressure drops below 0.900 atm, the pilot is required to put on an oxy…

1. The calcium supplements taken by many women are composed primarily of powdere

1. The calcium supplements taken by many women are composed primarily of powdered calcium carbonate, CaCO3, which is also the primary component of marble. a) Briefly explain why C…

1. The carbomethoxy group is a meta director. a. True b. False 2. The carbometho

1. The carbomethoxy group is a meta director. a. True b. False 2. The carbomethoxy group will deactivate the benzene ring, while the nitro group will activate the benzene ring. a.…

1. The carbon-14 activity of a fiber from an Egyptian mummy shroud is 7.50 disin

1. The carbon-14 activity of a fiber from an Egyptian mummy shroud is 7.50 disintegrations per minute per gram of carbon. How old is the fiber? The half-life of C-14 is 5730 years…