Chemistry Questions and Answers April 15, 2020

Chapter 17 pt 3 Give the major product(s) of th O.

B. Determination of the SolubilityProduct Constant C lo o Absorbance Cro, 2.8K104 2,9x104 3.3x 104 (Ag 4g K, of Ag,Cro, 1. 14.8 11.2 2. 3.

B. Determination of the SolubilityProduct Constant C lo o Absorbance Cro, 2.8K104 2,9x104 3.3x 104 (Ag 4g K, of Ag,Cro, 1. 14.8 11.2 2. 3.

supply products for the following reactions. no mechanisms are needed. give the product names for the sugars, just give the starting material's name.

trypsin NH3ARLCO2 H20

If 30.0 mL of water that is 0.0500 M in Q is to be extracted with four 10.0-mL portions of an immiscible organic solvent, what is the minimum distribution coefficient that allows transfer of all but the following percentages of the solute to the organic layer: (a) 1.00 X10-24 (b) 1.00 X10-22 Your answer

A student needs to measure out17mL of a solution to add to a reaction container, select all pieces of equipment that can be used to accomplish this task O a 20ml beaker a 50ml beaker a 25ml Erlenmeyer flask O a 10ml graduated cylinder O a 25ml graduated cylinder O a volumetric flask Da volumetric pipet

Please fill in the blanks Which set of reagents (given below) would produce the products given in the following reaction A E B C Br2, hv Br2, DCM HBr, DCM HBr, H20 HBr, H2O2 G H. F NBS H2, Pd Br2, H2O KMNO4 1. Li, 2. Cul K L M heat Grubbs CH212, Zn

What constitutional isomers could be possible for Co(H2O)4(SCN)2CI Coordination isomers only Both coordination and linkage isomers No isomers exist for Co(H20)4(SCN)2CI Linkage isomers only

Which of the following statements are true I. Activation energy of a reaction is smaller at higher temperature than at lower temperature. II. Catalyst lowers the activation energy of a reaction. III. Activation energy of a reaction does not change with change in temperature. (A) I () I and III (C) I and II (D) III

Calculate the lowest absorption frequency for a linear molecule containing five conjugated double bonds. The length of the pi bond system is 1.05 nm. (A) 302401 cm (B) 302401 cm (C) 302401 m (D) 274910 cm

The Arrhenius activation energy for the following reaction is 15.5 kJ mol. What is the value of AH The reaction is H(g) Br, (g) HBr(g) Br(g) (A) 1.13 kJ mol (B) 7.19 J mol (C) 7.19 kJ mol (D) 1.13 kJ mol

Predict the products a and b in the following reaction. .COOH 1.diazotization a b 2. heat NH2 3.thiophene CH (B) (A) H3CCH3 CH b a b a CH (C) S H3CCH3 (D) CH b a b a

If 2 g NaOH is dissolved in water to make 250 ml solution . Give the molarity of the solution.

A tank is charged with a mixture of 1.0 x 103 mol of oxygen and 4.5 x 10 mol of helium. Calculate the mole fraction of each gas in the mixture

Choose the correct answer 1-The POH of 0.05 M NaOH solution is : A- 12.5 B- 12.7 C- 12.9 D-13.0 E- none of them 2-The PH of the H + concentration is 5x10 -4 M A- 3.0 B- 3.3 C- 3.5 D- 3.7 E- none of them 3-The POH of 0. 2 mole potassium hydroxide solution in 500 ml equal to A- 12.4 B- 12.6 C- 12.8 D-13.0 E- none of them 4- The summation of the H+

HCl solution was added to TiCl4 salt and a precipitate is formed, explain why a precipitate is formed?

Calculate the solubility of Ag2CO3. [Ksp= 6.3 x 10 -23]

Calculate the equivalent weight for the following: a) H 2 CO 3 b) AI (OH) 3

How many moles are present in : a) 200ml of 0.5 M H 2 SO 4 b) 1.0 liter of 0,2 N CaCO 3

10 mg of NaCl is mixed with 100 g water, explain the concentration in: a) ppt b)ppm c)ppb

Calculate the 10% of 275 tons

Q. Assign the 1H and 13CNMR values (Chemical shifts) to the following compounds along with their structures and sources. Also add refrences. 1. Dicranolomin 3Deoxy, 2,3dihydro 2. Dicranolomin 2,3Dihydro 4. Dicyclokuwanon EA 6a, 10aDiepimer 5. dicyclokuwanon EB 7. hydroxymorusin 3. Dicyclokuwanon EA 6. benzokuwanon E,

18. Equal volumes of two solutions containing 3.65g of HCl and 4.0 g of NaOH respectively are mixed. The pli of the mixture is 2) 7 3) 7 19. When Imi of 0.IN HCIIS added to 1 litre of a solution of pH value 4, the pH will be nearly 1) 5 2) 4.477 3) 3 4) 3.699 20 A 0.01 M ammonia solution is 5 ionized, 1)7 4) 0 the concentration of OH ions is

functional group for 1 Amine

The value of Kp ( 25 C) for compound H when partitioned between water and chloroform is 2.1. Starting with a solution of 30 g of compound H in 250 mL of water what quantity of compound H (in grams) would remain in the water layer after two successive extractions with chloroform each using 125 mL of chloroform Please carry maximum number of

When using the LWQ method, a pharmacist needs to obtain 60 mg of a drug using a balance that has a MWQ of 120 mg. If the desired quantity of drug is to be contained in a mixture mass of 150 for the last step, what mass of diluent (in mg) is to be weighed by the pharmacist?

8. Calculate the pH when the following quantities of 0.0719 M NaOH solution have been added to 50.00 ml of 0.0575 M formic acid (weak acid) solution. (HCOH, K, 1.80 x 10) a) 0.00 ml (Weak acid dissociation) b) Equivalence volume ,c) 10 mL LESS the equivalence volume d) pH at the equivalence point (Base Hydrolysis All HA A (formate ion) bes OnM

theta means temperature

2) Using the data below, use a mathematical software to make an Arrhenius plot and determine the activation energy 01C 565 728 757 780 kI s1 1.10 x 103 0.380 0.871 1.67 Attach your plot in the space below for full credit.

Draw out the mechanism with arrows for the reaction of Ubiquinone to Ubiquinol.

OH CH3 e H CH, e 2H CH3 H3C H3C H3C H3C. H3C H3C. R R 10 CH3 OH Oxidized form of coenzyme Q (Q, ubiquinone) Semiquinone intermediate Reduced form of coenzyme Q (QH2, ubiquinol) (QH)

For the reaction 2HBr(g) C2(g) 2HCI(g) Br2(g) AH 81.1 kJ and AS 1.2 JK The maximum amount of work that could be done when 2.27 moles of HBr(g) react at 259 K, 1 atm is kJ. Assume that AH and AS are independent of temperature. Submit Answer Retry Entire Group 7 more group attempts remalning

(14 points) Provide a reasonable synthetic pathway to obtain compound A from the suggested starting materials and any other organic and inorganic reagents. Partial credit can be given if part of the approach is reasonable. w.. RXN07A OH A. several steps

Which of the following has the highest molar solubility AgBr (Ksp 5.0x 1013) 3D MNCO3 (Ksp 2.2x 1011) 3D Mg(OH)2 (Ksp 7.1 1012) 3

Chemistry In a Robinson Annulation, after microwave heating the reaction mixture, 3mL of water is added to induce crystal formation. Why does water aid this formation?

Predict the product of the following reactions, clearly showing stereochemistry where relevant, and describing the type of transformation that is taking place. OH a) , 186 CH,CHCH2 CH3 80 C b) CH2 EtzN CI CI c) CH3 N. Ph H2CCHCN zo

Consider the reaction sequence below to answer the following questions L. NaO, BIOH Coa No, OH, Compound Z. OB 2. CO Compound X Compound Y Compound X, diethyl propanedioate, is more commonly known as acetoacetic ester Oxalic ester O malonic ester O ethyl acetoacetate

Which of the following statements are TRUE? Multiple answers:Multiple answers are accepted for this question PLEASE SHOW WORK FOR EACH PART AND EXPLAIN WHY EACH ANSWER CHOICE IS WRONG OR RIGHT a The tripeptide His-Lys-Glu has a net charge of -2 at pH 8.0. b The tripeptide Asp-Asp-Asp has a net charge of -3 at pH 7.0. c The tetrapeptide

The critical point for a substance is 1000 atm and 750 K. The triple point for this substance is 0.500 atm and 200 K. This substance is used as a solvent in a liquid solution. The triple point of this solution will have a Select pressure an VSolect) HIGHER LOWER temperature

When CO2 diffuses into the bloodstream, the following reactions occur CO2(g) H2O(I) H2CO3(aq) HCO3 (aq) H (aq) The reactions shown shifts to the and the pH. O right, lowers None of the above O left, lowers O left, highers right, highers

What does it mean for a carbohydrate to mutarotate Briefly describe the mechanism Your answer

What are the coefficients for the chemical equation below, once balanced? ___ CH 3 CH 2 CH 2 OH(l) + ___O 2 (g) ___CO 2 (g) + ___H 2 O(l)

What is the major product of the reaction shown H,NNH2 heat H2N H,N

nIn the R , S system, which of the following alkyl groups has lowest priority? Group of answer choices butyl ethyl

Using 2 mols of ice, a student performed an experiment to determine the molar enthalpy of fusion for water. The percent error for the experiment was 4.5, and the measured value was larger than the accepted value, AHf 6.014 How much heat (q), in joules, was absorbed during the experiment mol a) 12,561 J O b) 270 J c) 8374 d) 12,561 J e) 270 J

The pH of an aqueous solution of 0.494 M codeine (a weak base with the formula C13H,0,N) is ,The pOH of an aqueous solution of 0.494 M diethylamine (a weak base with the formula (C,H3)2NH) is

Potassium chlorate decomposes according to the following balanced chemical equation 2 KCIO, (s) 2 KCI (s) 3 O, (g) What volume of O, is formed at STP when 2.50 g of KCIO, decomposes

A hypothetical metal crystallizes with the facecentered cubic unit cell. The radius of the metal atom is 208 picometers and its molar mass is 195.08 gmol. Calculate the density of the metal in gcm. Enter your answer numerically and in terms of gcm3.

2. Here are spectra for an unknown with the formula CgH100. What is this compound IR 3500 3000 2500 2000 1500 H NMR (1) (2) (2) (2) (3) 10 2 13C NMR (d) (d) (t) (q) (d) (s) (s) 200 150 100 50

Chemistry Why are some chiral drugs are sold as a mixture of enantiomers and why some are not? How enantiomers affect the biological activity of the drugs? Explain.