Chemistry concepts and calculations

4. A 35.00 ml sample of water run-off from the BSU coal-pile was collected and t

4. A 35.00 ml sample of water run-off from the BSU coal-pile was collected and treated with an excess of KSCN to complex the Fe(I) and form a red-complex at 450 nm. After dilution…

4. A 35.00 ml sample of water run-off from the BSU coal-pile was collected and t

4. A 35.00 ml sample of water run-off from the BSU coal-pile was collected and treated with an excess of KSCN to complex the Fe(I) and form a red-complex at 450 nm. After dilution…

4. A Beer’s Law plot was prepared for the reaction A(aq) + B(aq) AB(aq), plottin

4. A Beer’s Law plot was prepared for the reaction A(aq) + B(aq) AB(aq), plotting absorption over AB(aq) concentration. The linear equation for this plot was y = 78.3x. A solution…

4. A chemical reaction takes place in a series of four continuous stirred tank r

4. A chemical reaction takes place in a series of four continuous stirred tank reactors arranged as shown in FigureE23. 100 lit/h 1000 lit/h 100 lit/h C, 1 mol/lit 1000 lit/h Figu…

4. A chemist devised the following synthetic schemes. Some of the sequences will

4. A chemist devised the following synthetic schemes. Some of the sequences will give reasonable yields of the indicated product, but others either will not work at all or will gi…

4. A chemist measured the amount of calcium carbonate present in an antacid tabl

4. A chemist measured the amount of calcium carbonate present in an antacid tablet as follows. The tablet would not dissolve in water, but dissolved completely in 25.0 mL of 0.5 0…

4. A company uses sodium carbonate, soda ash, as a base in manufacturing its pro

4. A company uses sodium carbonate, soda ash, as a base in manufacturing its products, and must continuously analyze its materials. If a sample of soda ash weighs 1.2224 grams and…

4. A company uses sodium carbonate, soda ash, as a base in manufacturing its pro

4. A company uses sodium carbonate, soda ash, as a base in manufacturing its products, and must continuously analyze its materials. If a sample of soda ash weighs 1.2224 grams and…

4. A diprotic acid has the following pK values: pKa1 = 5.50, pKa2 = 9.50 A. At w

4. A diprotic acid has the following pK values: pKa1 = 5.50, pKa2 = 9.50 A. At what pH does [H2A] = [HA- ]? B. At what pH doe [HA- ] = [A2- ]? C. Which is the principal species at…

4. A gas chromatogram of the organic components of a sample of beer using a colu

4.       A gas chromatogram of the organic components of a sample of beer using a column that separates compounds on the basis of their relative boiling points provides a GLC trac…

4. A gas chromatogram of the organic components of a sample of beer using a colu

                    4. A gas chromatogram of the organic components of a sample of beer                     using a column that separates compounds on the basis of their relative …

4. A gas chromatogram of the organic components of a sample of beer using a colu

                    4. A gas chromatogram of the organic components of a sample of beer                     using a column that separates compounds on the basis of their relative …

4. A gas chromatogram of the organic components of a sample of beer using a colu

                    4. A gas chromatogram of the organic components of a sample of beer                     using a column that separates compounds on the basis of their relative …

4. A graduated cylinder is filled with 15.0 mL of distilled water. Student A the

4. A graduated cylinder is filled with 15.0 mL of distilled water. Student A then adds 10.000 grams of copper shot to the same cylinder; the water level rises to the 22.5 mL mark.…

4. A graduated cylinder is filled with 15.0 mL of distilled water. Student A the

4. A graduated cylinder is filled with 15.0 mL of distilled water. Student A then adds 10.000 grams of copper shot to the same cylinder; the water level rises to the 22.5 mL mark.…

4. A helium gas tank has a pressure of 81.6 atm at 25°C. The volume of the tank

4. A helium gas tank has a pressure of 81.6 atm at 25°C. The volume of the tank is 29.5L. How many moles of helium are in the tank? 5. If all of the helium was released into a lar…

4. A hot pack contains 100 ml salt solution, and it should reach a maximum of 65

4. A hot pack contains 100 ml salt solution, and it should reach a maximum of 65 C. A cold pack contains 100 ml salt solution, and it should reach a minimum of 0 °C In an experime…

4. A hydrate of zinc sulfate, ZnSo4 XH2O, decomposes to produce 43.9% water. Cal

4. A hydrate of zinc sulfate, ZnSo4 XH2O, decomposes to produce 43.9% water. Calculate the water of crystallization (X) and write the formula for the hydrate. 5. A hydrate of cali…

4. A hydrate of zinc sulfate, ZnSo4 XH2O, decomposes to produce 43.9% water. Cal

4. A hydrate of zinc sulfate, ZnSo4 XH2O, decomposes to produce 43.9% water. Calculate the water of crystallization (X) and write the formula for the hydrate. 5. A hydrate of cali…

4. A protein sample contains a single protein made up of two dissimilar polypept

4. A protein sample contains a single protein made up of two dissimilar polypeptide chains of 25,000 daltons and 45,000 daltons joined together by disulfide bonds. Following SDS-P…

4. A puddle of coastal seawater, caught in a depression formed by some coastal r

4. A puddle of coastal seawater, caught in a depression formed by some coastal rocks at high tide, begins to evaporate as the tide goes out. If the volume of a puddle decreases to…

4. A pure substance is described by the following thermodynamic equation: where

4. A pure substance is described by the following thermodynamic equation: where bar U, bar S, and bar V are the molar energy, entropy, and volume, R is the gas constant, and T0 an…

4. A quantity of 2.40moles of pure SO2Cl2gas was placed in an 8.00 L sealedflask

4. A quantity of 2.40moles of pure SO2Cl2gas was placed in an 8.00 L sealedflask. At 500 K, after equilibrium isestablished, there are 1.60 moles of the product gasSO2 present. Ca…

4. A rifle bullet with a mass of 7.00 g strikes and embeds itself in a block wit

4. A rifle bullet with a mass of 7.00 g strikes and embeds itself in a block with mass 0.884 kg that rests on a frictionless horizontal surface and is attached to a coil spring. T…

4. A sample consists of one or two of the following salts: Na,CO,, KNO3, CaCl. I

4. A sample consists of one or two of the following salts: Na,CO,, KNO3, CaCl. It is known that the sample completely dissolves in water and when dilute HCl is added to the soluti…

4. A sample of Pr-147 is prepared and put in a scintillation counter. The initia

4. A sample of Pr-147 is prepared and put in a scintillation counter. The initial counting rate is 600. counts/min. After 31.0 minutes, the rate is 119 counts/min. What is the hal…

4. A sample of orange juice was titrated with the standardized iodine solution f

4. A sample of orange juice was titrated with the standardized iodine solution from the previous problem. A 100 mL sample of juice took 10.57 mL of I2 to reach the starch end poin…

4. A scientist in a laboratory carries out a chemical reaction using 12.01 g of

4. A scientist in a laboratory carries out a chemical reaction using 12.01 g of carbon and 64.14 g or sulfur. The reaction produces 76.15 g of a pure compound. Does this observati…

4. A solution containing an unknown concentration of copper (Cu^2+) was mixed wi

4. A solution containing an unknown concentration of copper (Cu^2+) was mixed with varying amounts of a standard Cu solution as described n the table below. The concentration of t…

4. A solution of malonic acid, H2C,H204, was standardized by titration with 0.10

4. A solution of malonic acid, H2C,H204, was standardized by titration with 0.1000 M NaOH solution. 20.76 mL of the NaOH solution is required to neutralize completely 12.95 mL of …

4. A specific ms of oil with a heat of 2.418 J g c I. Calculate the amount of he

4. A specific ms of oil with a heat of 2.418 J g c I. Calculate the amount of heat energy required, in k, to raise the temperature of the calorimeter from 25.00 C to 31.60 C. A. 4…

4. A student adds an excess (more than she needs to react completely) of solid s

4. A student adds an excess (more than she needs to react completely) of solid sodium hydrogen carbonate to a beaker containing exactly 675 mL of 0.220M coper(II)nitrate aqueous s…

4. A student analyzed an antacid tablet from a bottle of 48 tablets purchased at

4. A student analyzed an antacid tablet from a bottle of 48 tablets purchased at a discount store for $1.00. The mass of the tablet was 1.462 g. After adding 25.00 mL of 0.8000M H…

4. A student collected the following data while determining the molar heat of ne

4. A student collected the following data while determining the molar heat of neutralization of a mono- protic acid, HA, with NaOH. Calculate the molar heat of neutralization of t…

4. A student determining the equilibrium constant for the formation of the FeNCS

4. A student determining the equilibrium constant for the formation of the FeNCS2+ ion followed the procedure in this experiment. In Part L 2.00 x 10-1M Fes and 2.00 x 10-3M SCN i…

4. A student determining the equilibrium constant for the formation of the FeNCS

4. A student determining the equilibrium constant for the formation of the FeNCS2+ ion followed the procedure in this experiment. In Part L 2.00 x 10-1M Fes and 2.00 x 10-3M SCN i…

4. A student determining the equilibrium constant for the formation of the FeNcs

4. A student determining the equilibrium constant for the formation of the FeNcs21 ion followed the procedure in this experiment. In Part I, 2.00 x 10-1M Fe and 2.00 x 10 M SCN io…

4. A student has prepared 0.05 M solution of CoHs-OH and has added to it 0.05 M

4. A student has prepared 0.05 M solution of CoHs-OH and has added to it 0.05 M solution of di- iso-propylamine (HN(CH(CH3)2)2. (8 points) (i) Write the equation for the acid-base…

4. A student is Studying the equilibrium escribed by Equation 19. heat + CoSO4 .

4. A student is Studying the equilibrium escribed by Equation 19. heat + CoSO4 .7 H2O(s, pink) +7 SOCI2(l) CoSO4 (s blue) +7 SO2(g) +14 HCI(g) (Eq. 19) Using microscale techniques…

4. A student obtained the following results for the standardization of their NaO

4. A student obtained the following results for the standardization of their NaOH solution. Trial 1: 1.112 M Trial 2: 0.9872 M Trial 3: 0.9852 M Should the student do a fourth tri…

4. A student obtains a 1 Liter bottle of toluene (a liquid at room temperature)

4. A student obtains a 1 Liter bottle of toluene (a liquid at room temperature) from a storage room that has dimensions of 8m x 8m x 5m. Unfortunately, the student drops the bottl…

4. A student wants to perform the Fischer Esterification of pentanoic acid with

4. A student wants to perform the Fischer Esterification of pentanoic acid with 2-butanol. For this reaction he/she wants to use a 3 molar excess of the alcohol. The student start…

4. A student was given an unknown pure solid and was asked to determine the iden

4. A student was given an unknown pure solid and was asked to determine the identity of the unknown by doing a mixed melting point analysis. The student was also told that the sol…

4. A student, in analyzing a Group l unknown, makes the following observations.

4. A student, in analyzing a Group l unknown, makes the following observations. Indicate which ions are definitely present, which are absent and which are questionable (might be p…

4. A student, in analyzing a Group l unknown, makes the following observations.

4. A student, in analyzing a Group l unknown, makes the following observations. Indicate which ions are definitely present, which are absent and which are questionable (might be p…

4. A sulfuric acid (HSO.) solution has density 1.55 g/ml. This solution is 65.0%

4. A sulfuric acid (HSO.) solution has density 1.55 g/ml. This solution is 65.0% HSO by mass, the remainder being water. What mass of t pure H SO4 is contained in 1.00 liter of th…

4. A) What is the reaction specified for finding the heat of formation for C2H26

4. A) What is the reaction specified for finding the heat of formation for C2H26 ? Don't forget states! Remember that the heat of formation is the energy absorbed or released when…

4. A1.00 L buffer is made containing 50.0 mmol of bromoacetic acid (pKa 290 and

4. A1.00 L buffer is made containing 50.0 mmol of bromoacetic acid (pKa 290 and 75.0 mmol of sodium bromoacetate. What volume of 2.00 M NaOH must be added to increase the pH ofthi…

4. A1.00 L buffer is made containing 50.0 mmol of bromoacetic acid (pKa 290 and

4. A1.00 L buffer is made containing 50.0 mmol of bromoacetic acid (pKa 290 and 75.0 mmol of sodium bromoacetate. What volume of 2.00 M NaOH must be added to increase the pH ofthi…

4. ATr Kfx concentration. What does ATr stand for ? What does Kr stand for ? Wha

4. ATr Kfx concentration. What does ATr stand for ? What does Kr stand for ? What are the units of the concentration used in this type of calculation? 5. A solvent has a freezing …