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
- "[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?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.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. 7.50
- A 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.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?
- 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.