Chemistry concepts and calculations

2. A piston-cylinder assembly contains 1 kg of nitrogen at 200 kPa with an initi

2. A piston-cylinder assembly contains 1 kg of nitrogen at 200 kPa with an initial volume of 0.5 m3. Heat transfer causes the nitrogen to expand slowly at a constant temperature. …

2. A potassium oxalate solution with known concentration is often used to standa

2. A potassium oxalate solution with known concentration is often used to standardize a potassium permanganate solution. 2a. 1.1270g of potassium oxalate monohydrate (K2C.0 H20, F…

2. A precipitate of Pbl2 is formed when S mL of 0.012 M Pb(NO,)2 is added to 5 m

2. A precipitate of Pbl2 is formed when S mL of 0.012 M Pb(NO,)2 is added to 5 mL of 0.030 MKI. It was found experimentally that the final concentration of r in the 10 mL solution…

2. A procedure you want to duplicate calls for a 0.100 M sodium phosphate buffer

2. A procedure you want to duplicate calls for a 0.100 M sodium phosphate buffer, pH 7.0. You decide to prepare a liter of said buffer. The pKa’s of ortho-phosphoric acid are 2.12…

2. A reaction D + B prei hers is tound to be renth order in B and second order e

2. A reaction D + B prei hers is tound to be renth order in B and second order equation is k Ae In the Arrhenius equation, the units tthe dimensiones) of the a in D. The Arrhenius…

2. A reaction is studied, the following mechanism is determined, and this reacti

2. A reaction is studied, the following mechanism is determined, and this reaction coordinate diagram is generated. Please label the intermediates and activated complexes on the d…

2. A reaction is studied, the following mechanism is determined, and this reacti

2. A reaction is studied, the following mechanism is determined, and this reaction coordinate diagram is generated. Please label the intermediates and activated complexes on the d…

2. A sample of pure CaCO3 weighing 0.2500 g is dissolved in hydrochloric acid an

2. A sample of pure CaCO3 weighing 0.2500 g is dissolved in hydrochloric acid and the solution dilut to 250.0 ml in a volumetric flask. A 25.00 ml aliquot requires 40.11 ml of an …

2. A second assumption in this experiment relates to the specific heat capacity

2. A second assumption in this experiment relates to the specific heat capacity of the solution. We will assume the specific heat capacity of the solution is dominated by the spec…

2. A solid chloride sample weighing 0.2853 g required 43.75 mL of 005273 M AgNO,

2. A solid chloride sample weighing 0.2853 g required 43.75 mL of 005273 M AgNO, to reach the Ag,Cro, end point. a. How many moles Cl-ion were present in the sample? (Use Eqs. 2 a…

2. A solution of calcium chloride was made by dissolving 2.77 grams in 100.0 mL

2. A solution of calcium chloride was made by dissolving 2.77 grams in 100.0 mL of deionized water. This solution was labeled "Solution # 1 then made The following dilutions were …

2. A solution of calcium chloride was made by dissolving 2.77 grams in 100.0 mL

2. A solution of calcium chloride was made by dissolving 2.77 grams in 100.0 mL of deionized water. This solution was labeled "Solution # 1 then made The following dilutions were …

2. A standard sample of compound A was placed on a silica TLC plate. After eluti

2. A standard sample of compound A was placed on a silica TLC plate. After elution in 30/70 ethyl acetate/hexane, the sample showed a single spot at 3.4 cm (relative to the initia…

2. A standard solution of 0.342 M NaOH was used to determine the concentration o

2. A standard solution of 0.342 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 25.00 mL of the acid, w…

2. A store receives a shipment of defective balloons. Each has a tiny pinhole of

2. A store receives a shipment of defective balloons. Each has a tiny pinhole of the same size. If one balloon is filled with helium and another is filled with air to the same vol…

2. A student constructs a coffee cup calorimeter and places 50.0 mL of water int

2. A student constructs a coffee cup calorimeter and places 50.0 mL of water into it. After a brief period of stabilization, the temperature of the water in the calorimeter is det…

2. A student is attempting to determine the heat capacity at constan pressure (C

2. A student is attempting to determine the heat capacity at constan pressure (Cp) of a colorless, odorless liquid that is miscible with ("dissolves in") water. To do so, he mixes…

2. A student is interested in the concentration of blue dye in his favorite b kn

2. A student is interested in the concentration of blue dye in his favorite b knows that spectroscopy can be used to determine the concentration of dye molecules in a solution. Af…

2. A student obtained the following data in this experiment. Fill in the blanks

2. A student obtained the following data in this experiment. Fill in the blanks in the data and make the indicated calculations: Mass of gelatin capsule: 0.1 168 g Mass of capsule…

2. A student performed the experiment described in this module, using 5.00 ml of

2. A student performed the experiment described in this module, using 5.00 ml of a 2.50% H2O2 solution with a density of 1.01 g ml-1. The water temperature was 24 degrees Celsius,…

2. A student pipetted exactly 5.00 mL of vinegar into a 250-mL Erlenmeyer flask

2. A student pipetted exactly 5.00 mL of vinegar into a 250-mL Erlenmeyer flask and added about 45 mL of boiled distilled water and a drop of phenolphthalein indicator. A 50 mL bu…

2. A student thought he carefully followed the directions in the experimental pr

2. A student thought he carefully followed the directions in the experimental procedure, and he expected 2.63g of product (Aspirin). However, he isolated 3.05g of product. what wo…

2. A student was performing an acid/base titration to determine the molar concen

2. A student was performing an acid/base titration to determine the molar concentration of a sample of vinegar, using phenolphthalein as an indicator. After dispensing a 10.00 mL …

2. A student, following the procedure described in this module, used water as th

2. A student, following the procedure described in this module, used water as the solvent and encountered some interesting problems. Comment on the effect, if any, each of the fol…

2. A styrofoam cup has a calorimeter constant of 9.8 cal / C. Show your work for

2. A styrofoam cup has a calorimeter constant of 9.8 cal / C. Show your work for each answer. (a) If a neutralization reaction performed in this calorimeter causes the temperature…

2. A system consists of an ideal gas with Cvm 20.86 J mol K (constant over the t

2. A system consists of an ideal gas with Cvm 20.86 J mol K (constant over the temperatures of interest). The gas is initially at temperature 250.0 K, volume 3.000 L, and pressure…

2. A thin cylindrical plate made of silver is approximately 0.02 inch thick (0.5

2. A thin cylindrical plate made of silver is approximately 0.02 inch thick (0.5 mm) and has a radius of 10mm. Assume that all unit cells of the silver plate are arranged so that …

2. A water solution has 2.00x10 -5 moles of H + in 2.00 liters A. What is the [H

2.   A water solution has 2.00x10-5 moles of H+ in 2.00 liters A. What is the [H+] in the solution? B. What is the pH ? C. What is the [OH-] ions? D. Is the solution acidic or bas…

2. A) If a 1.0-gallon (3.785L) bottle were filled with bleach (NaOCl), how many

2. A) If a 1.0-gallon (3.785L) bottle were filled with bleach (NaOCl), how many Cl atoms would be in the bottle? Bleach=1.090 g/ml. B) At 25°C, the density of water is 0.0997 gm/m…

2. A) If a 1.0-gallon (3.785L) bottle were filled with bleach (NaOCl), how many

2. A) If a 1.0-gallon (3.785L) bottle were filled with bleach (NaOCl), how many Cl atoms would be in the bottle? Bleach=1.090 g/ml. B) At 25°C, the density of water is 0.0997 gm/m…

2. A) In the first beaker, we have a 0.600 M aqueous solution of HF. What is the

2. A) In the first beaker, we have a 0.600 M aqueous solution of HF. What is the pH at equilibrium? Adapted from the University of Colorado at Boulder CHEM 1133 Recitation Manual,…

2. A. A crude dialysate yields an absorbance reading of 12 when undiluted. What

2. A. A crude dialysate yields an absorbance reading of 12 when undiluted. What dilution would be necessary to get the absorbance of 0.5? 1:24 dilution needed B. Most cuvettes hol…

2. A. A crude dialysate yields an absorbance reading of 12 when undiluted. What

2. A. A crude dialysate yields an absorbance reading of 12 when undiluted. What dilution would be necessary to get the absorbance of 0.5? 1:24 dilution needed B. Most cuvettes hol…

2. A. During Part I of the water Analysis series, you prepared a Stock solution

2. A. During Part I of the water Analysis series, you prepared a Stock solution of Phosphate ion containing 50.0 mg P/L. In the second part of this experiment, you will use this S…

2. ACID Problem Calculate the pH of a solution of 103 M chromic acid (H2CrOa): p

2. ACID Problem Calculate the pH of a solution of 103 M chromic acid (H2CrOa): pKa1 0.74; pKa2 6.49 both at 25*C 3. Buffer1 Calculate the pH of a buffer solution prepared by mixin…

2. Acetone (2-propanone) and water in the presence of acid reach an equilibrium

2. Acetone (2-propanone) and water in the presence of acid reach an equilibrium with a measurable amount of tetrahedral product. a) Draw the mechanism for the formation of the tet…

2. Address each of the following: a. Write a balanced equation for the formation

2. Address each of the following: a. Write a balanced equation for the formation of one mole of NaCl(s) from its elements. The enthalpy change for this reaction is =-411.1 kJ/mol.…

2. After widespread groundwater contamination in the U.S. was discovered in the

2. After widespread groundwater contamination in the U.S. was discovered in the 1980s, regulations were put in place to prevent or contain leaks from underground storage tanks, su…

2. All of the following sets of quantum numbers are allowed EXCEPT a. n = 5, l =

2. All of the following sets of quantum numbers are allowed EXCEPT a. n = 5, l = 3, ml = +2, b. n = 3, l = 2, ml = -1, c. n = 3, l = 0, ml = 0, d. n = 4, l = 4, ml = -2, e. n = 5,…

2. All of the following sets of quantum numbers are allowed EXCEPT a. n = 5, l =

2. All of the following sets of quantum numbers are allowed EXCEPT a. n = 5, l = 3, ml = +2, b. n = 3, l = 2, ml = -1, c. n = 3, l = 0, ml = 0, d. n = 4, l = 4, ml = -2, e. n = 5,…

2. All real gases deviate to some extent from the behavior of ideal gases. At st

2. All real gases deviate to some extent from the behavior of ideal gases. At standard conditions, t gas is 0.0014290 g/mL, that of H2 gas is 0.00008988 g/mL, and that of CO2 is 0…

2. Allana and Brenda are both doing the same experiment, which requires them to

2. Allana and Brenda are both doing the same experiment, which requires them to use a volumetric pipette (described in the Techniques folder) to dispense a fluid several different…

2. Amino acids and proteins can act as buffers in the body since they contain fu

2. Amino acids and proteins can act as buffers in the body since they contain functional groups that may act as weak acids or bases. The side chain of the lysine amino acid has a …

2. Amino acids are commonly classified as nonpolar or as polar, based on the pro

2. Amino acids are commonly classified as nonpolar or as polar, based on the properties of the side chain residues. Quantification of these properties is important for a variety o…

2. Amino acids are commonly classified as nonpolar or as polar, based on the pro

2. Amino acids are commonly classified as nonpolar or as polar, based on the properties of the side chain residues. Quantification of these properties is important for a variety o…

2. An 80-year-old woman was admitted with a First Admission Admission Second dia

2. An 80-year-old woman was admitted with a First Admission Admission Second diagnosis of hypertension, congestive heart failure, anemia, possible diabetes, and chronic renal fail…

2. An 80-year-old woman was admitted with a First Admission Admission Second dia

2. An 80-year-old woman was admitted with a First Admission Admission Second diagnosis of hypertension, congestive heart failure, anemia, possible diabetes, and chronic renal fail…

2. An Indicator Dye Crystal violet is a base (pK, 13.05) that is sometimes used

2. An Indicator Dye Crystal violet is a base (pK, 13.05) that is sometimes used as an indicator dye. In strongly basic solutions, the indicator is blue, wheréas in strongly acidic…

2. An active metal (an oxidation state is +3) reacts with hydrochloric acid (HCI

2. An active metal (an oxidation state is +3) reacts with hydrochloric acid (HCI) to form nydrogen gas. The gas is collected in a gas buret. The following during the study data we…

2. An aluminium calorimeter with a mass of 35.0 g contains 295 g of water. The c

2. An aluminium calorimeter with a mass of 35.0 g contains 295 g of water. The calorimeter and water are in thermal equilibrium at 20.0°C. A 75.0 g copper block at an initial temp…