Question 1 In an experiment to determine the riboflavin by fluorescence spectrometry, a series of riboflavin standards was analyzed and gave a calibration with a slope of 1000 ppm 1 and a y intercept of 25. If a sample gave a fluorescence reading of 750, what is the riboflavin concentration (in ppm) of the sample? O A. 7.50 О в. 0.0750 OC.0.725 O D. 0.775
Q: A metal erystallizes in a face-centered cubic lattice. The radius of the atom is 196 pm and the dens...
A: Given that radius of the atom = 196 pm
Q: 3. 4. 500 mL of 0.75 N of K2Cr207 from a pure solid reagent if it follows the following half reactio...
A: In this type of question first thing should be balance the half reaction. Cr2O72- ...........> Cr...
Q: ie vapor pressure a
A:
Q: 11. The net reaction for formation of HI from H2 and I2 is H, +I, 2 2HI The following mechanism was ...
A:
Q: complete ionic equation for A. 3CaCl2(aq)+2Na3PO4
A:
Q: Consider the equilibrium system described by the chemical reaction below, which has a value of Kp eq...
A:
Q: Pentyl butane Accurate 2- (1- methylethyl) Impacible Bicyclo propane Accurate Cycloethy! Impossible ...
A:
Q: Balance the following equation with the smallest whole number coefficients. What is the coefficient ...
A:
Q: 1.If you started with 0.325 g. of copper wire, how many grams of copper (II) hydroxide could be prod...
A:
Q: Some measurements of the initial rate of a certain reaction are given in the table below. [N:] [H] i...
A:
Q: You are joining Professor Begley’s research lab und he asks you to prepare 340ml of a 1.2 M KCl solu...
A: Given, Volume of KCl solution(V )= 340 ml Molarity of KCl solution(M) = 1.2 M Molecular weight of K...
Q: Write an acceptable IUPAC name for the compound below. Include 'cis' and trans' as part of the name ...
A: We have to write an acceptable IUPAC name for the following given two c
Q: What is the pH of a solution with hydroxide ion concentration
A: pH = - log[H+] At 25° C [H+] [OH-] = 10-14 Given that [OH-] = 0.0076 M [H+] (0.0076 M) = 10-1...
Q: QUESTION 1 The fraction of bound sites: 0 = [L]([L] + Kd) Myoglobin (Mb) is 0.75 saturated at pO2 of...
A: Lets understand theory part of this question.
Q: 6. A student titrates 3 samples of KHP. The experimental data collected is shown below. Titration # ...
A: The solution is as follows:
Q: 5) Which of the following statements is a correct description of the most stable conformation of 1,1...
A:
Q: What is the energy of system A? 15 What is the energy of system B? 16 9J 8J 6J In how many ways can ...
A:
Q: how would you prepare 9 liters of a 50% dye solution beginning with a 60% stock dye solution?
A: Given :- Initial concentration or concentration of stock solution = 60% Final concentration or con...
Q: Which of the following would be classified as an electrophile? > View Avallable Hint(s) CH, B. CH, C...
A: Electrophiles are the species that are deficient of electrons and can accept electrons (Lewis acids)...
Q: E 00 Ili %24 3. When 0.126 mol of carbon is burned in a closed vessel with 9.39 g of oxygen, how man...
A:
Q: onstant is given for two a B(g) Kc = ?
A:
Q: 7. Identify nucleophile and electrophile in the following reaction. Show the curved arrow for the nu...
A:
Q: Question 9 Suppose you wanted to create conditions that favor the positively charged ion of the spec...
A:
Q: Which noble gas effuses 3.2 times faster than argon at 0°C (or any temperature!)? (HINT: What inform...
A:
Q: What diene and dienophile would react to give the following Diels-Alder product? + + I II II IV Sele...
A: The correct option is:
Q: How does the following affect the basicity of compounds? Explain clearly and thoroughly. a. Bond le...
A: Basicity is the number of protons given by an acid when it is dissolved in water. Acidic strength or...
Q: Atenolol
A: Question 4: Due to it's structural peculiarity i.e asymmetric carbon atom. This chiral carbon centre...
Q: Suppose you have 1 g of a solute X (K = 10) in 100 mL of water (solvent 1) and you want to extract i...
A: Liquid-liquid extraction
Q: Consider the following reaction: CH4(g) +2 H2S(g) CS2(g) + 4 H2(g) A reaction mixture initially cont...
A:
Q: 6. Complex Polymer Growth a. Propose a synthesis of the following compound using a commercial carbox...
A:
Q: - of Ke for
A:
Q: In which of the following reactions will Ke = Kp? %3! O 4 NH3(g) +3 O2(g) 2 N2(g) + 6 H20(g) O 2 N2(...
A:
Q: Complete the table by drawing Lewis structures for the following molecules/ions and specifying their...
A: Formula for determining the hybridization of central atom :- x= (V+M-C+A)/2 V = valence electrons ...
Q: ne molality of the
A: Since you have asked multiple questions, we will solve the first question for you. If you want any s...
Q: Reaction rate and stoichiometry: 2A --> 4B Two moles of A disappear for every 4 moles of B that are ...
A: Given :- 2A → 4B 2 moles of A disappear for every 4 moles of B that are formed. To identify :- Co...
Q: Specify the formal charges (both sign and magnitude) on the atoms labeled a-c b 1) H3C-C=N=o: a 0 bo...
A: C, N , O contains 4 , 5 and 6 valence electrons respectively.
Q: Acid/Base Ionization & pH & pOH 2. Calculating [H;O*]/[OH] from pH/pOH a) [OH] when pH = 5.30 b) [OH...
A:
Q: Excluding atoms that only have one electron shell, how many electrons does each atom want to have in...
A: Each atom wants to become stable and this is done by sharing or transfer of electrons. Sharing of el...
Q: A tank with a capacity of 74 liters, initially contains 20 kilograms of salt dissolved in 50 liters ...
A: Given, Total capacity - 74 L Initially - 20 kg salt in 50 L of water. Final addition - (74 - 50) = 2...
Q: Calculate the approximate boiling point (in °C) of a solution of 285 g of magnesium chloride in 2.0 ...
A: Given, Mass of magnesium chloride (MgCl2) = 285 g Mass of water solvent = 2.0 Kg Boiling point eleva...
Q: The pH of an aqueous acid solution is 6.15 at 25°C. Calculate the K, for the acid. The initial acid ...
A: Given :- initial concentration of acid = 0.012/M pH of solution = 6.15 To calculate :- Ka of aci...
Q: 12. Provide one other contributing resonance form for structures A, B, and C. Show all electron move...
A: Resonance structures are formed by movement of pair of electron or single electron.
Q: CHO Ethanol `NH; OH OH но Salicylaldehyde 16lesanediamine NN-Disalicylaldehydehy de-1,6-hexanediimin...
A: The theoretical yield and percent yield can be calculated as
Q: Consider the equilibrium system described by the chemical reaction below. At equilibrium, a sample o...
A:
Q: How many moles are in 1.05 x 1022 molecules of an unknown compound? Your Answer: Answer units
A: Here, we have to find the number of moles present in 1.05 × 1022 molecules of an unknown compound.
Q: Consider the following reaction at equilibrium. What will happen if the pressure increased ? 4FES2(s...
A:
Q: Some measurements of the initial rate of a certain reaction are given in the table below. [N] [H.] i...
A:
Q: Classify HClO4 strong acid weak acid strong base weak base
A:
Q: 41.9 ml. of 0.151 M NAOH was needed to neutralize 50.0 mL of an H2S04 solution. What is the concentr...
A: Sulfuric acid reacts with sodium hydroxide to form sodium sulfate and water. The equation for the ba...
Q: Which of the following is not an example of a covalent bond? A N-N B Mg-N C N-O D H-H
A: Given, The following is not an example of a covalent bond that is:
Step by step
Solved in 2 steps with 1 images
- A sample solution containing quinine was analysed by fluorescence spectroscopy. 5 mL of the sample solution was diluted with 0.1 M HCl to a final volume of 100 mL. The fluorescence of the solution was measured and gave a value of 54. A reference solution containing 0.086 mg/mL of quinine gave a fluorescence reading of 38. A blank solution gave a fluorescence reading of 21. Calculate the quinine content of the sample solution in mg/mL."[FeSCN2+]eq is calculated using the formula: [FeSCN2+]eq = Aeq/Astd x [FeSCN2+]std where Aeq and Astd are the absorbance values for the equilibrium and standard sample respectively." I am confused about what Aeq and Astd mean. We did an experiment where we measured the absorption of this chemical formation and I got around 0.18. Is that one of the values?The ppm concentration of Pb2+ in a blood sample were measured with Spectrophotometry. 5.00 mL of a blood sample were taken and this sample gave a signal of 0.301 a.u.. Another 5.00 mL of a blood sample were mixed with 0.50 mL og 1.75 ppm Pb2+. Then, this mixture was diluted to 25.00 mL and this diluted mixture gave a signal of 0.406 a.u.. What is the ppm concentration of a blood sample?
- (2) Adenine has a molar absorbance of 4 13.1 M-1cm-1 for 263 nm nucleic acid. What is the molar concentration of an acid solution that shows a permeability of 75% when 2 ml of it is placed in an absorption cell with a thickness of 1 cm?In an experiment to determine the riboflavin by fluorescence spectrometry, a series of riboflavin standards was analyzed and gave a calibration with a slope of 1000 ppm-1 and a y intercept of 25. If a sample gave a fluorescence reading of 750, what is the riboflavin concentration (in ppm) of the sample? A. 0.725 B. 0.775 C. 0.0750 D. 7.50A natural products chemist isolated the sphingolipids shown at the right(alpha-GalCerBf) as the mixture of compounds that differed in their chain lengths. The structures shown, including the branching pattern, were determined NMR. The table below includes the found high-resolution masses of the three major isomers (negative mode,{M-H}-). Fill in the calcualted masses and the error ppm.
- You obtained the following raw data when setting up a Biuret standard curve: BSA (mg/ml) Absorbancy 540nm 0 0.158 1 0.210 2 0.260 3 0.305 4 0.360 5 0.410 6 0.455 7 0.510 8 0.530 9 0.550 10 0.554 After blanking against a biuret-dH2O sample, the protein concentration of an unknown sample was determined using the same method and an absorbancy of 0.251 was obtained. Set up a standard curve, excluding outliers (experimental and statistical) and determine the protein concentration in the unknown sample in mg / ml (up to 3 significant figures).Explain why is FAAS a good method of quantifying Ca in milk?You obtained the following raw data when setting up a Biuret standard curve: Absorbancy 540nm BSA (mg/ml) 0.158 1 0.210 2 0.260 3 0.305 4 0.360 0.410 0.455 7 0.510 8 0.530 9 0.550 10 0.554 After blanking against a biuret-dH20 sample, the protein concentration of an unknown sample was determined using the same method and an absorbancy of 0.279 was obtained. Set up a standard curve, excluding outliers (experimental and statistical) and determine the protein concentration in the unknown sample in mg / ml (up to 3 significant figures).
- A 10 cm 3 air saturated Fricke dosimetry solution in a 1 cm diameter tube is irradiated for 10 min in a 6~ source of gamma rays. The optical density measured at 304 txm in a 1 cm light path at 30~ was 0.260 after the completion of irradiation and 0.003 before irradiation. (a) What is the total dose in gray absorbed by the solution?(b) If 10 cm 3 of methanol is irradiated in the same tube for the same 10min, what is the absorbed dose in gray. The Z/A for methanol is 0.562 and that for the Fricke dosimeter is 0.553. Explain any assumption you make to solve the problem.In a Stern-Volmer plot, what is the source of the largest fluorescence signal? 1.6 Ky=(1.35 ± 0.05)10°M" 1.4- 1.2 - 1.0 0.5 1.0 1.5 2.0 2.5 3.0 Concentration [µM] A. The solution at 0.5 micoMolar B. The solution at 3.0 microMolar C. The Blank FO/FDr. Waybell designs a study to investigate whether the dose of melatonin taken before bed impacts people's moods. Dr. Waybell rejects Ho and computes 7²=0.05. She has made a Type Il error. O Dr. Waybell retain reject Ho and computes n=0.005. She has made a Type Il error. O Dr. Waybell rejects Ho and computes 7=0.005. She has made a Type Il error. Dr. Waybell retain reject Ho and computes n=0.05. She has made a Type Il error.