Homework Answers
Option (a) 510 nm is correct
Reason : The optimum wavelength is 510 because that is the
Wavelength of maximum absorbance by the solution
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1 points Save Answer QUESTION 25 A student finds the percent transmittance and the absorbance of...
A student is instructed to determine the concentration of a solution of CoCl2 based on absorption...
A student is instructed to determine the concentration of a solution of CoCl2 based on absorption of light (spectrometric/colorimetric method). The student is provided with a 0.10 M solution of CoCl2 with which to prepare standard solutions with concentrations of 0.020 M, 0.040 M, 0.060 Mand 0.080 M (a) Describe the procedure for diluting the 0.10 M solutions to a concentration of 0.020 M using distilled water, a 100 mL volumetric flask, and a pipet or buret. Include specific amounts where...
QUESTION 1 1 points Save Answer The evaporation of ethanol (molar mass = 46.07 g/mol) involves...
QUESTION 1 1 points Save Answer The evaporation of ethanol (molar mass = 46.07 g/mol) involves an enthalpy change of 0.918 kJ/g. What is the molar enthalpy of vaporization of ethanol? 0 -0.0369 kJ/mol +37.8 kJ/mol O-42.3 kJ/mol O +1.18 kJ/mol O 12.2.1.1.al Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Close Window Save and Submit
6.7 x 10 -M QUESTION 23 1 points Save Answer Which of the following chemical equations...
6.7 x 10 -M QUESTION 23 1 points Save Answer Which of the following chemical equations corresponds to k b2 for SO 3 2-? . HSO3- (aq) + H20(0) = H2SO3(aq) + OH"(aq) b.S032-(aq) + H30+(aq) = HSO3(aq) + H20(1) C.H2SO3(aq) + OH"(aq) = HSO3"(aq) + H20(0) d. HSO3(aq) + OH"(aq) =S032-(aq) + H2010 e.S032-(aq) + H20(1) = HSO3 (aq) + OH(aq) Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All...
QUESTION 4 1 points Save Answer By how much would the temperature of 9.13 g of...
QUESTION 4 1 points Save Answer By how much would the temperature of 9.13 g of pure water increase when 0.910 kJ of heat is applied, assuming a specific heat capacity of 4.18 J/(g•°C)? Express your answer to 3 significant figures and in units of °C, but do not include units when inputting your answer. Temperature increase = ? °C Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Close...
QUESTION 1 Looking at equation 1. (Absorbance = a*b*Concentration) if we know that the path length...
QUESTION 1 Looking at equation 1. (Absorbance = a*b*Concentration) if we know that the path length (b) is one, then we should plot concentre x -axis (x or y) and plot absorbance on they -axis (x or y). You should prepare a calibrati for absorbance vs concentration on pg 121. QUESTION 2 Using the fact that at 0.10 M, the absorbance was 0.357, and at 0.20 M, the absorbance was 0.714, the absorptivity (slope) is |(answer to 2 dec places)....
A student records the following wavelengths (to ±10 nm) for the helium emission. Extension Requests Print Assignment Question 12 3 456 Total -2 -fi 4.9/5-1-11-1 4.9/11(44.5%) Points Assignment Submis...
A student records the following wavelengths (to ±10 nm) for the
helium emission.
Extension Requests Print Assignment Question 12 3 456 Total -2 -fi 4.9/5-1-11-1 4.9/11(44.5%) Points Assignment Submission Description For this assignment, you submit answers by question parts. The number of submissions ramaining for each question part only changes if you submit or change the answer Quantum States for the Visible Hydrogen Atomic Emission Spectrum Assignment Scoring Your last submission is used for your score. 1. -12 points UCSCGenChemL1...
answer please Question 1 12.5 points Save Answer The complex that is formed between galium (1)...
answer please
Question 1 12.5 points Save Answer The complex that is formed between galium (1) and B-hydroxyquinoline has an absorption maximum of 568nm. A 0.0082M solution of the complex has a transmittance of 42.9% when measured in a 1.00-cm cell at this wavelength. Calculate the molar absorptivity of the compex. Question 2 of 8 Question 2 12.5 points Save Answ Chromium(III) forms a complex with diphenylcarbazide whose molar absorptivity is 4.17X104 at 540 nm. Calculate the path length in...
Question Completion Status: (800 - 1000) = (1.96379.06, +30 1.33333 points Save Answer QUESTION 4 A...
Question Completion Status: (800 - 1000) = (1.96379.06, +30 1.33333 points Save Answer QUESTION 4 A researcher is comparing the amount of calories in two different lunch special pizzas: Hawaiian and pepperoni. Random samples of 30 Hawaiian and 30 pepperoni are taken. The mean amount of calories in the Hawaiian pizza was 800 calories and the mean amount of calories in the pepperoni pizza was 1000. Assume that the standard deviations for the two populations are 50 and 100 calories,...
QUESTION 3 1 points Save Answer The enthalpy change for the reaction of perchloric acid (HC104)...
QUESTION 3 1 points Save Answer The enthalpy change for the reaction of perchloric acid (HC104) and potassium hydroxide (KOH) is being studied. The reaction of 50.00 mL of 0.2520 mol/L HCIO4 with 50.00 mL of 0.3120 mol/L KOH in a coffee cup calorimeter resulted in a temperature change from 23.1 °C to 25.5 °C. The density of the solution is 1.040 g/mL, and the heat capacity of the solution is 4.158 J g-1 °C-1. Calculate the qsys for this...
pharmacy law QUESTION 1 10 points Save Answer Which term matches the definition: manipulation during compounding...
pharmacy law
QUESTION 1 10 points Save Answer Which term matches the definition: manipulation during compounding allowing sterility to remain intact? International Organization for Standardization O Aseptic Technique Disinfect O Beyond-use dating QUESTION 2 10 points Save Answer What is the definition of beyond use dating? It is the date in which you can start to use the compound It is the date assigned by the manufacturer It is the date after which you should not use the compound O...
A student is instructed to determine the concentration of a solution of CoCl2 based on absorption of light (spectrometric/colorimetric method). The student is provided with a 0.10 M solution of CoCl2 with which to prepare standard solutions with concentrations of 0.020 M, 0.040 M, 0.060 Mand 0.080 M (a) Describe the procedure for diluting the 0.10 M solutions to a concentration of 0.020 M using distilled water, a 100 mL volumetric flask, and a pipet or buret. Include specific amounts where...
QUESTION 1 1 points Save Answer The evaporation of ethanol (molar mass = 46.07 g/mol) involves an enthalpy change of 0.918 kJ/g. What is the molar enthalpy of vaporization of ethanol? 0 -0.0369 kJ/mol +37.8 kJ/mol O-42.3 kJ/mol O +1.18 kJ/mol O 12.2.1.1.al Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Close Window Save and Submit
6.7 x 10 -M QUESTION 23 1 points Save Answer Which of the following chemical equations corresponds to k b2 for SO 3 2-? . HSO3- (aq) + H20(0) = H2SO3(aq) + OH"(aq) b.S032-(aq) + H30+(aq) = HSO3(aq) + H20(1) C.H2SO3(aq) + OH"(aq) = HSO3"(aq) + H20(0) d. HSO3(aq) + OH"(aq) =S032-(aq) + H2010 e.S032-(aq) + H20(1) = HSO3 (aq) + OH(aq) Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All...
QUESTION 4 1 points Save Answer By how much would the temperature of 9.13 g of pure water increase when 0.910 kJ of heat is applied, assuming a specific heat capacity of 4.18 J/(g•°C)? Express your answer to 3 significant figures and in units of °C, but do not include units when inputting your answer. Temperature increase = ? °C Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Close...
QUESTION 1 Looking at equation 1. (Absorbance = a*b*Concentration) if we know that the path length (b) is one, then we should plot concentre x -axis (x or y) and plot absorbance on they -axis (x or y). You should prepare a calibrati for absorbance vs concentration on pg 121. QUESTION 2 Using the fact that at 0.10 M, the absorbance was 0.357, and at 0.20 M, the absorbance was 0.714, the absorptivity (slope) is |(answer to 2 dec places)....
A student records the following wavelengths (to ±10 nm) for the
helium emission.
Extension Requests Print Assignment Question 12 3 456 Total -2 -fi 4.9/5-1-11-1 4.9/11(44.5%) Points Assignment Submission Description For this assignment, you submit answers by question parts. The number of submissions ramaining for each question part only changes if you submit or change the answer Quantum States for the Visible Hydrogen Atomic Emission Spectrum Assignment Scoring Your last submission is used for your score. 1. -12 points UCSCGenChemL1...
answer please
Question 1 12.5 points Save Answer The complex that is formed between galium (1) and B-hydroxyquinoline has an absorption maximum of 568nm. A 0.0082M solution of the complex has a transmittance of 42.9% when measured in a 1.00-cm cell at this wavelength. Calculate the molar absorptivity of the compex. Question 2 of 8 Question 2 12.5 points Save Answ Chromium(III) forms a complex with diphenylcarbazide whose molar absorptivity is 4.17X104 at 540 nm. Calculate the path length in...
Question Completion Status: (800 - 1000) = (1.96379.06, +30 1.33333 points Save Answer QUESTION 4 A researcher is comparing the amount of calories in two different lunch special pizzas: Hawaiian and pepperoni. Random samples of 30 Hawaiian and 30 pepperoni are taken. The mean amount of calories in the Hawaiian pizza was 800 calories and the mean amount of calories in the pepperoni pizza was 1000. Assume that the standard deviations for the two populations are 50 and 100 calories,...
QUESTION 3 1 points Save Answer The enthalpy change for the reaction of perchloric acid (HC104) and potassium hydroxide (KOH) is being studied. The reaction of 50.00 mL of 0.2520 mol/L HCIO4 with 50.00 mL of 0.3120 mol/L KOH in a coffee cup calorimeter resulted in a temperature change from 23.1 °C to 25.5 °C. The density of the solution is 1.040 g/mL, and the heat capacity of the solution is 4.158 J g-1 °C-1. Calculate the qsys for this...
pharmacy law
QUESTION 1 10 points Save Answer Which term matches the definition: manipulation during compounding allowing sterility to remain intact? International Organization for Standardization O Aseptic Technique Disinfect O Beyond-use dating QUESTION 2 10 points Save Answer What is the definition of beyond use dating? It is the date in which you can start to use the compound It is the date assigned by the manufacturer It is the date after which you should not use the compound O...
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