a) Briefly describe the meaning of chromophores. b) (i) Depict the graph using Microsoft excel (ii) Identify the caffeine concentrations in two unknown samples, X and Y, having absorbance values of 0.123 and 0.376.
Q: If 100 grams of glucose (C6H12O6) was dissolved in a solution, calculate the millimoles of oxygen.
A: Mole can be defined as a standard unit for measuring large quantities of very small entities such as...
Q: Using the 13 rule and Hydrogen deficiency indicator (HDI), determine the molecular formula and propo...
A:
Q: For the following statements about chemical equations, check the boxes that represent true statement...
A: Please find your solution below : Chemical reaction is described by a chemical equation. Chemical eq...
Q: Calculate the standard enthalpy change for the reaction at 25 °C. Standard enthalpy of formation val...
A:
Q: What is the molar concentration of NaOH in a solution that contains 1560 ppm to give 750 ml.( Na=23,...
A: Parts per million (PPM) is a unit of measurement used when expressing a very dilute concentration le...
Q: Question 2 of 20 Which of the following compounds would have the highest boiling point? H,C NH2 A) C...
A: Boiling point: The temperature at which the vapor pressure of a liquid becomes equal to the atmosphe...
Q: 11. The conducting loop in Fig- ure Q25.11 is moving into the region between the magnetic poles show...
A: Concepts and Reasons :The concepts needed to solve this problem are the force of charge in a magneti...
Q: in your own words, explain the browning reaction that occurs in cooking ground pork
A: The correct answer is given below
Q: For each of the following IR spectra, determine whether it agrees with the structure of a ketone, an...
A: General IR absorptions of some functional group : Ketone : a sharp peak at 1715 cm-1(C=O stretch) ...
Q: Part A Place the following elements in order of decreasing atomic size: silicon, nitrogen, helium, p...
A: Atomic radius: The distance between the nucleus and the outermost electron is known as the atomic ra...
Q: 7. What is the name of the amino that has an ɛ amino group on its side chain? What is the one letter...
A: The above question is from amino acids. The amino acids which has amino group in ε- position with re...
Q: 4. What is the osmotic pressure of a 0.0522M solution of C 12H22011 at 55 °C? A. 1.1 atm B. 1.4 atm ...
A:
Q: Ketones and aldehydes react with sodium acetylide (the sodium salt of acetylene) to give alcohols, a...
A:
Q: Given the following data 2 CIF(g)+ O2 (g) Cl, O(g) + F,0(g) 2 CIF3 (9) + 202 (g) → Cl, O(9) + 3F,0(g...
A: The enthalpy change is a state function and the Hess law states that the change of enthalpy in a che...
Q: Calculate the enthalpy of formation of water. State the reactants and the products of the reaction a...
A: Enthalpy of formation of water is heat released when 1 mole of water is formed from its pure natural...
Q: Q3-al Calculate Miller's coefficient for the surface that cuts the crystal's coordinates at the Cart...
A:
Q: 4.) Determine if each of the following is a spontaneous process, a nonspontaneous process, or an equ...
A: The answers are given below
Q: The following compound is treated with excess K2Cr2O7. Provide the name of the product that would fo...
A: K2Cr2O7 is an oxidising agent. It oxidised secondary alcohol into ketone.
Q: 3. What is the boiling point of a 6.95M solution of C12H22011 in water? A. 105.2 C B. 107.0 °C C. 10...
A: Colligative properties: The colligative properties are those properties of solutions that depend on ...
Q: .on three components True O False O Number of isomers of the .Ethane is one True O
A: We will be answering all the questions with proper explanation.
Q: Why is there a need for 2 indicators in the analysis of mixed alkali? How do the two indicators help...
A: For a mixed alkali ( two alkalis having different pH range ) we use 2 indicators.
Q: Multiple choice 1. What type of relationship does boiling point and vapor pressure exhibit? Choices...
A: Colligative Property of solution.,
Q: 7.) Calculate the standard free-energy changes for the following reactions at 25°C: (a) CH4(g) + 202...
A:
Q: potassium and sulfur Express your answers as ions and chemical formula separated by a commas. rubidi...
A:
Q: The hydrogen ion concentration of a solution is 0.00001 moles per liter. What is the hydrogen ion co...
A: Given, The hydrogen ion concentration of a solution is 0.00001 mole/ liter. What is the hydrogen io...
Q: Reaction product ( HCI + .Ethylene) is 1-Chloroehtane True False O Quantum is the amount of .energy ...
A: 1) True 2) True
Q: Determine the molarity of a solution with a volume of 445. mL and 0.590 mol of solute dissolved.
A:
Q: A 31.9 mM (millimolar) solution was made using 0.202 L of a 221 mM solution. What is the final volum...
A:
Q: A 15.3 M solution has a volume of 4.0 L. The volume is tripled by adding water. What is the final mo...
A: M1V1 = M2V2 M = molarity of solution(M) V = volume of solution (L) M * V = number of moles Number o...
Q: A solution is made by dissolving 25.1 g of barium acetate, Ba(CH3CO0)2, in enough water to make exac...
A:
Q: NaBH, NaBH, OH PCC CH,CI,
A:
Q: Question 3 What is the reaction order for the decomposition of p-toluenesulfinic acid? 3 CH3C6H4SO2H...
A: Chemical kinetics can be defined as the branch of chemistry that deals with rates of chemical reacti...
Q: [References] It has been determined that the body can generate 5500 kJ of energy during one hour of ...
A:
Q: An organic chemistry student prepared 110. mL of a cyclohexane-ethanol solution at 24.0 °C by measur...
A: The volume of solute in milliliter present in 100 mL solution is known as the volume percent concent...
Q: A student ran the following reaction in the laboratory at 1180 K: 2502(0) + Oala) 2503(0) When she I...
A:
Q: Part A What volume (in mL) of a 0.150 M HNO3 solution will completely react with 35.7 mL of a 0.108 ...
A: The correct answer is given below
Q: Natural cements only used in specialized mortars. Made from calcintion of clay-rich limestones True ...
A: Cement : It is the binder which is used to bind the two materials together by its property setting a...
Q: In the standardization of a solution of NaOH against 2.508 grams of oxalic acid (H2C2O4•2H2O), 42.53...
A: An acid exactly neutralizes the same number of equivalents of base and vice-versa. milliequivalents ...
Q: (2) ukai A 0.250 M solution of Na2C204 is to be used in a reaction in which the C2042- will be oxidi...
A:
Q: ammonium perchlorate The pH will be less than 7. barium nitrite The pH will be approximately equal t...
A: The solutions which are acidic will have pH less than 7, more than 7 will be basic and having pH 7 w...
Q: Question 1 This following is the reaction for the synthesis of ammonia: N2 + 3 H2 + 2 NH3 At a certa...
A:
Q: 1. How are each of the structures A-F related to structure X? They could be E (enantiomers), D (dias...
A:
Q: It has been dete of energy during
A: Given the amount of heat generated by our body during 1 hour of exercise = 5500 kJ / 1 hour The heat...
Q: subject) - maryhar X M <3- mary.h Ô https://www-awu.aleks.com/alekscgi/x/Isl.exe/1o_u-IgNslkr7j8P3jH...
A:
Q: CH3 HCI CH3 H3C (b) H3C. HBr H3C. CH3 Br (с) HBr or (d) HCI
A: Given
Q: i need the answer quickly
A: Since you asked specific multiple questions so, as per Q&A guidelines of portal I solved all th...
Q: 1. Which will be the major product if 3,3-demethyl-2- butanol to react in 85% of H3P04? a. 2,3-demet...
A: Alcohol gives dehydration reactions when they react with a strong acid like H2SO4 or H3PO4 to form a...
Q: The following compound is treated with 1 equivalent of K2Cr207. Provide the name of the product that...
A:
Q: 38.3 g KNO3 Express your answer in moles to three significant figures. mol KNO3 Submit Request Answe...
A: Given, Mass of potassium nitrate(KNO3) = 38.3 g Number of moles of KNO3 = ?
Q: valence electron
A:
Kindly answer question a & b
Step by step
Solved in 2 steps with 1 images
- Briefly explain the principle behind the following techniques:(a) ion-exchange chromatography (b) gel filtration chromatography (c) affinity chromatography (d) Use three diagrams to illustrate the separation of three different proteins by thesemethods.Briefly describe how a phase-contrast microscope work and the kind of image that itproduces. Give a specific use for this type of microscope.Can paper chromatography be used to separate and identify very volatile substances? Why? Please explain comprehensively.
- In normal-phase HPLC chromatography, the stationary phase is polar and the mobile phase is nonpolar. In the reversed phase we have just the opposite; the stationary phase is nonpolar and the mobile phase is polar. Describe molecules in which move faster or slower in each case.Use a suitable model to explain how separation and identification of a mixture of organic compounds can be achieved with a thin layer chromatographic (TLC) technique.Briefly explain how cation exchange chromatography can used in protein separation?
- A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, te, was found to be 200.8 s with a baseline peak width, we, of 16.1 s. The retention time for aspartame, ta, was 258.7 s with a baseline peak width, wa, of 20.6 s. The retention time for the unretained solvent methanol was 44.2 s. Calculate the average plate height, H, in micrometers for this separation, given that it was performed on a 22.1 cm long column. H = Calculate the resolution, R, for this separation using the widths of the peaks. R = 88.2 R₂5N = 3.16 Calculate the resolution if the number of theoretical plates were to increase by a factor of 2.5. 3.533 Incorrect μmCaffeine, C8H10O2N4 H2O (MW = 212.2 g/mol) has been shown to have an average absorbance of 0.644 for a concentration of 1.783 mg per 100 mL at 272 nm. A sample of 3.658 g of a soluble coffee product was mixed with water to a volume of 500 mL and a 25 mL aliquot was transferred to a flask containing 25 mL of 0.1 M H2SO4. This was subjected to the prescribed clarification treatment and made up to 500 mL. A portion of this treated solution showed an absorbance of 0.666 at 272 nm. Assumbe b = 1.0 cm. Calculate the % caffeine (w/w) in the sample.How does ammonia, dimethylglyoxime (DMG), and 8-hydroxyquinoline (8HQ) interact with your cations, leading to the evolution of colored species? Context: Paper chromatography experiment (separation of inorganic cations) with a 9:1 acetone/ HCl solvent
- A molecular exclusion column has a diameter of 7.8 mm and a length of 30 cm. The solid portion of the particles occupies 20% of the volume, the pores occupy 40%, and the volume between particles occupies 40%. (a) At what volume would totally excluded molecules be expected to emerge? (b) At what volume would the smallest molecules be expected? (c) A mixture of polymers of various molecular masses is eluted between 23 and 27 mL. What does this imply about the retention mechanism for these solutes on the column?What types of samples can be analyzed by IR?How are substances that are opaque (nottransparent) handled using this technique?Q4 (a) Analyze the importance of dropping mercury electrode on polarography. (b) (i) Calculate the molarity of MgSO4 in a solution containing 1.5 g ofMgSO4 in a volume of 250 mL?(ii) Calculate the weight of MgSO4 in grams which is present in 100mL of 0.076 M MgSO4?(c) Evaluate the key differences between paper chromatography and gaschromatography