Chemistry Questions and Answers April 25, 2020

An amount of NaHCO was added to water such that the total carbonate concentration was 104 M. If it is assumed that no other constituents are present, a pCpH diagram for this watercarbonate system is shown below. (a) What is the statement of mass balance for total dissolved carbonate in the system (b) What is the charge balance for dissolved

The Economist, a British business magazine, once stated that annual global liquid fuel consumption amounts to a volume of 1 cubic mile. Using the following information, calculate how many gallons this would be and express in scientific notation 1 mile 5,280 feet 1 gallon 0.1337 ft (5 points) 3

Assemble the straightchain form of C6H14. Note the many conformations as the chain twists. Remove two Hs, one from either end, and join the two end Cs with a single bond to form the cyclic compound cyclohexane. With care, you might be able to convert between the chair and boat forms without breaking any bonds Remove a CH2 group (methylene) from

Find the speed of sound in m/s if it travels through a medium made up exclusively of a monoatomic gas. Use Newton's equation but accounting for adiabatic rather than isothermal compression/expansion of the gas. You are also given that the density of the gas is 1.277 kg/m3, and that the pressure of the gas is 1.0 atm.

Assemble the straight-chain form of C6H14. Note the many conformations as the chain twists. Remove two -H\'s, one from either end, and join the two end C\'s with a single bond to form the cyclic compound cyclohexane. With care, you might be able to convert between the "chair" and "boat" forms without breaking any bonds! Remove a -CH2- group

How many electrons are there in a Au cation 78 O77 O R1 O 80 O 79

Identify the class of biomolecule of each structure and give the names of the smaller components that make up each.?

CH3 H3CNCH3 . . 88 010100 HCCHCH NH OH 0C 4CH HC S CH CH CH CH CH CH CH CH CH CH CH CH 18 CH 3,HC O) P OCH, 0 0 I O P OCH2 3 N 0 N 5 O) P OCH, H NH NH Zk,CH2OH 0 0 Swever 0 CH2OH CHOH Ow

Please give me full solution

1. Name each of the following compounds using IUPAC rules. One may common names, or terms if they are considered IUPAC acceptable OH 4CEC Br

The recommended concentration of Kanamycin in an LB medium is 50 g/mL. Typically we make 1000 times more concentrated (known as 1000X) stock solution, which is 50 mg/mL. The stock solution is then aliquoted and kept at -20 C. Suppose you want to make 25 mL of 1000X solution; calculate the amount of Kanamycin. Assume that you are growing 200 mL of

4. Write all possible pairs of Enantiomers and Diastereomers from the following molecules.(use numbers(111V) writing pairs) A) 1. 2R,3Rdichloropentane II. 2R,3SdiChloropentane II. 2S,3Rdichloropentane IV.2S,3Sdichloropentane Enantiomers Diastereomers B) I. 3S,4Sdimethyhexane II. 3S,4Rdimethyhexane III. 3R,4Sdimethyhexane IV. 3R,4Rdimethyhexane

5. Assign cistrans or EZ configuration for the following compounds. Write the name of each compound. A) CH,CH3 H3CH,C Configuration Name H,CH,C ) CH CH,CHa Configuration Name C) HC. CH,CH,0H H,CH,C Configuration Name D) H3C. CH,CH(CH,), CH2CH3 (H,C ),HC Configuration Name F) 0 N. .CN CH NH2 H C Configuration Name G) H3CH 2C Configuration Name 10

Question 3 Using your knowledge of chemistry and biochemistry, explain how GOx impacts the following AH (glucose Ece E A a. b. C. d. gluconic acid) (glucose gluconic acid) (glucose gluconic acid) (glucose gluconic acid)

The RedlichKwong equation of state is given by RT v(vb)vT where R the universal gas constant 0.518 kJ(kg K), T absolute temperature (K), p absolute pressure (kPa), and v the volume of a kg of gas (m3kg). The parameters a and b are calculated by a 0.427 T25 where pc 4600 kPa and Tc 191 K. As a chemical engineer, you are asked to determine

Determine the possible crystal structure of Zinc Blende structure (ZnS), if the radii are as follows Zn+2 = 0.74 and S-2 = 0.184.

If the adsorbed chloride ions occupy the inner Helmholtz layer of the electrical double layer, what is the field strength in Vm across the inner Helmholtz plane (IHP) when the potential drop across the entire double layer is 0.5 V Assume that 90 of the potential drop is across the IHP. Also assume that the IHP is located at the center of the

Find the frequency and energy of a photon of yellow light whose wavelength is 589 nm.

Briefly explain whether each of the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca 2+ ion in the analyzed tablet. The Steps are at the bottom. (a) A Student had difficulty decanting the supernatant solution from the test tubes in Step 9 , causing him to transfer some of the solid along with the

can you explain if you flipped an S to an R or vice vers? can you explain if you flipped an S to an R or vice vers?

6 The following three molecules are (R,R), (S,S), and (R,S)2,3dibromobutane. H. Br CH3 CH3 (R,R) Br H H. H CH3 CH3 (S,S) Br Br Br Br CH3 CH3 b. (9) Show the Fischer projections for the (R,R), (S,S), and (R,S) stereoisomers. a.(9) Which compound corresponds to each stereoisomer Write either (R,R), (S,S) or (R,S) under the appropriate structure. H

Derive the steady-state concentration profile as as a function of distance x for a pollutant undergoing second-order (i.e. r = kc2 ) and zeroth-order decay (i.e. r = k). 1 Problem: Derive the steady-state concentration profile as as a function of distance x for a pollutant undergoing second-order (i.e. r = kc2 ) and zeroth-order decay (i.e. r = k).

the solubility of compound a in ethanol is 0.65g per 100 ml at 0 degree celcius and 6 g per 100 ml at 78 degree celcius . what is the minimum amount of solvent needed to recrystallize a 30 g sample of compound a how much would be lost in the recrystallization? show your work

For many gases the temperature (C) dependence of the heat capacity Cp (joules(g mol) (C))of can be described using this equation C a bT cT dT. The following table gives the coefficients of the equation for four gases. Gas a b d SO 38.91 3.105 x 105 3.904 x 10 9.188 x 10 8.606 x 10 32.40 x 10 SO3 48.5 8.540 x 105 O 29.1 1.158 x 10 0.6076 x 105

2) Rank the Acidity of the following sets of compounds. a) b) NH COOH NH c) CICH, CICH2 Cl. ClaCH .COOH COOH .COOH COOH d) CH,CH, CHC OOH CH,CH,CHCOOH CH,CH,CHC OOH e) CI CH,CH,CCOOH 3) Rank the Stability of the following sets of Reaction Intermediates. O,N H,N H,co CH, a) ci

PartIII 1) Rank the Basicity of the following sets of compounds. CH b) c) d) e) NH2

2. Choose the more A cidic for each of the following pairs. Explain the resason for your choice. OH, ) Or II OH OH b) Or II c) ( CH3), H2 COOH (H),N CH, or d) CHCC00H Or CH3CH2COOH II COOM COOM e) NO, Or NH2

1. Use the reaction diagram below to answer each question. (3 points each) a. Is the reaction endergonic or exergonic b. How many steps are in the reaction C. How many intermediates are in the reaction d. How many transition states in the reaction Energy MM 2. Identify the species below as an electrophile or nucleophile. (4 points each) Species PH

CH,CH,CHCH,cO OH ,,, f) CI Or CI II g) CH, Or CH, II Choose the more acidic and explain the reason for your choice COOH COOH h) Or NH, i) Or II COOH COOH j) NO2 Or NO,

PostLaboratory Exercise NAME Column Chromatography 1. What property provides the basis for separation of the compounds by gel filtration 2. What are the values for Vo, V, Vt and Vg for your column 3. What is the stationary phase in this experiment 4. Did the chromatography run successfully separate the three colored molecules Explain.

A 0.6447g portion of manganese dioxide was added to an acidic solution in which 1.1402 g of a chloridecontaining sample was dissolved. Evolution of chlorine took place as a consequence of the following reaction MnO (s) 2Cl (aq) 4H (aq) Mn2 (aq) Cl (g) 2HO (1) After the reaction was complete, the excess MnO2 was collected by filtration,

You want to change the surface properties of a medical device by conjugation of material A and B, one at a time. Currently the only functional group of your medical device is hydroxyl (OH). How will you conjugate A and B. Also show the final structure. Medical device A H3CO. HO. B H3C. CH3

Question 2 Show how you can synthesize the following compounds using the indicated starting materials and any other necessary substances or reagents. A. NH3 (starting from nitrobenzene) . HC COOH (starting from paranitrotoluene) ,. OH D. Br CO,H

The 2D lattice below shows a set of diffraction lines over a series of 12 unit cells with axis a and b as shown a) Derive the Miller index for the line running through the origin of the indicated axis system. b) Assume that the drawing above is in three dimensions and that caxis is pointing at you. Derive the Miller index again for the 3D plane

The following reaction is the main mechanism for the removal of NO 2 from the atmosphere: NO 2 + OH + M HNO 3 + M The rate constant for this reaction is 4.8010 -31 (T/298 K) -1.6 cm 6 molecule -2 s -1 . (T is the temperature in K.) Determine the lifetime (in hours) of NO 2 with regard to this reaction, assuming a temperature of 24.8C, a pressure

T) 3 Chloro 2 butanol Assign as chiral or achiral. write the asymmetric carbon if chiral. H OH H HO H OH H HO H2OH U) V) ......... ..........

Write a report (2 pages maximum) in which you discuss the groups of the periodic table. The report must include, among other things, the explanation of the approach used to define them as well as their importance for the scientific community

63. How many milliliters of a soft drink are contained in a 12.0oz can

65. The diameter of a red blood cell is about 3 X 104 in. What is its diameter in centimeters

71. Use scientific (exponential) notation to express the following quantities in terms of the SI base units in Table 1.3 Common Unit Prefixes Prefix Symbol Factor Example femto f 1015 1 femtosecond (fs) 1 X 1015 s (0.000000000000001 s) pico 1012 1 picometer (pm) 1 x 1012 m (0.000000000001 m) 109 4 nanograms (ng) 4 X 109 g (0.000000004 g) nano

77. Make the conversion indicated in each of the following (a) the length of a soccer field, 120 m (three significant figures), to feet

77. Make the conversion indicated in each of the following (b) the height of Mt. Kilimanjaro, at 19,565 ft, the highest mountain in Africa, to kilometers

77. Make the conversion indicated in each of the following (c) the area of an 8.5 x 11inch sheet of paper in cm

77. Make the conversion indicated in each of the following (d) the displacement volume of an automobile engine, 161 in.3, to liters

89. Calculate these masses. (b) What is the mass of 25.0 mL octane, density 0.702 gcm3 3D

97. Convert the boiling temperature of liquid ammonia, 28.1 F, into degrees Celsius and kelvin.

63. How many milliliters of a soft drink are contained in a 12.0oz can

69. Many medical laboratory tests are run using 5.0 uL blood serum. What is this volume in milliliters

77. Make the conversion indicated in each of the following (a) the length of a soccer field, 120 m (three significant figures), to feet

10. The boiling point composition diagram for a binary mixture of benzene and isopropanol is shown below 82.0 80.0 78.0 76.0 74.0 72.0 E 70.0 0.0 0.20 0.40 0.60 0.80 1.00 Xisopropanol (a) What is the boiling point of pure benzene (b) What is the boiling point of the solution when Xjsopropanol 0.50 (c) What is the composition of the vapor

63. How many milliliters of a soft drink are contained in a 12.0oz can

65. The diameter of a red blood cell is about 3 X 104 in. What is its diameter in centimeters

69. Many medical laboratory tests are run using 5.0 uL blood serum. What is this volume in milliliters

71. Use scientific (exponential) notation to express the following quantities in terms of the SI base units in Table 1.3 Common Unit Prefixes Prefix Symbol Factor Example femto f 1015 1 femtosecond (fs) 1X 1015 s (0.000000000000001 s) pico 1012 1 picometer (pm) 1x 1012 m (0.000000000001 m) nano 109 4 nanograms (ng) 4 x 109 g (0.000000004 g)

77. Make the conversion indicated in each of the following (b) the height of Mt. Kilimanjaro, at 19,565 ft, the highest mountain in Africa, to kilometers

77. Make the conversion indicated in each of the following (c) the area of an 8.5 x 11inch sheet of paper in cm2

89. Calculate these masses. (a) What is the mass of 6.00 cm of mercury, density 13.5939 gcm3

89. Calculate these masses. (b) What is the mass of 25.0 mL octane, density 0.702 gcm3 D

97. Convert the boiling temperature of liquid ammonia, 28.1 F, into degrees Celsius and kelvin.

Help with thorough explanations of nm values, thanks!

11. Use the Bohr model for atomic structure and the BalmerRydberg equation to answer this question. The Balmer series for hydrogen (see above) occurs in the visible region of the electromagnetic spectrum. Another set of hydrogen spectral lines occurs outside of the visible region. These lines occur at 1875 nm, 1282 nm, 1094 nm, and 1005 nm. m for

Propose a plausible twostep mechanism for the reaction given below with the steps provided. ABCD (fast) Overall Reaction AB 20 E DCE (fast) AB CE (slow) Experimentally Determined Rate Law rate K(AB DBE (fast) 28 CE (slow) TwoStep Mechanism A 2B CE (slow) Step 1 ABCE (tast) Step 2 ABC D (slow) AED (fast)

An atmosphere contains NH at a fugacity of 1.0x109 atm. An aqueous solution has an NH activity of 6.0x109 M. Is the system at equilibrium Explain. D) i) ii) If not at equilibrium, predict the direction of NH flux.

K ,10. Codeine (CisHa1NO.) is a derivative of morphine that is used as an analgesic (painkiller), narcotic, or antitussive (cough syrup). It was once commonly used in cough syrups, but is now available only by prescription because of its addictive properties. a. Write the dissociation reaction and the corresponding K, equilibrium expression for

3. (20pts4pts each) Draw all reactants or products for each of the following reactions based on the information given. Be sure to provide the appropriate regio and stereochemistry unless otherwise stated. If a pair of enantiomers is expected, you may draw only a single product. a. d. o OH B DCl, HO 2) NaOH, HO 3) mCPBA 1) NHS, CC, v 25L pent 3)

At 25 C and 775 Torr, carbon dioxide has a solubility of 0.0347 M in water. What is its solubility at 25 C and 1150 Torr S F TOOLS x10

A man borrowed money from his friend in the amount of 5,000 birr on January 15, 2018. He is obliged to pay the amount on his friends birthday on November 28 during the same year at an interest rate of 22%. What is the exact simple interest of his debt?

BeHz is obtained by (A) direct reaction between Beand (B) deoxidation of Be(OH), (C) reaction of BeCl2withLiAlH4 (D) reaction of Be(OH),with LIAIH,

The conversion of plaster of paris in to hard solid involves all the following except (A) Hydration of Ca.sO.. H,0 (B) CaSO1.2H2Oorthorhombic crystals change to monoclinic crystals (C) Volume of the mass increases (D) The mass shrinks and becomes hard

In a good quality cement the mass ratio of SiOrto Al,Oz is (A) 50 to 60 (B) 20 to 25 (C) 5 to 10 (D) 2.5 to 4

The coordination number of Beryllium in solid (BeCl2), is (A) 4 (B) 2 (C) 6 (D) 3

Which one of the following anhydrous chloride is not obtained on direct heating of its hydrated chloride (A) BaCl2 (B) CaClz (C) MgCl2 (D) SrCl2

1121 AM 2.6KBs VPN Vo LTE 82 epraghna.comstudentexar 3 Duration 30000 Time Left 15037 The correct statements regarding Beryllium and its compounds isare A) dilute. HNO3do not react with the metal because of an oxide layer formation on surface B) The hydration energies of Be and F ions are greater than the lattice energy of BeF2 C)BeH2 and BeCl2

M9SO,on reaction with NH,OH NH,Cland Na, H PO4 forms a white crystalline precipitate. The formula of precipitate is (A) Mg (NH4) PO, (B) MgCl, (C) MgClz. M9SO4 (D) Mg(OH)2. M9SO4

The correct order of increasing thermal stability of carbonates is (A) BeCO, M9CO3 CaCO3 (B) M9CO3 BECO3 CACO3 (C) K2CO, M9CO3 CACO3 (D) BECO3 MgCO3 K2CO3

In which of the following the hydration energy is higher than the lattice energy (A) M9SO4 (B) CaCO3 (C) SrCO3 (D) BaSO4

Like alkali metals, the alkaline earth metals also dissolve in liquid ammonia. Which of the following isare correct statement(s) 1) Be and Mg show poor reaction. II) The colour of the solution is deep blue black II) Under suitable conditions M(NH3)6 can be recovered (A) Only I (B) Il and III both (C) I and II both (D) All of I. Il and III

Be(OH), and Al(OH), dissolve in NaOH to produce (A) Be(OH,), and Al(OH2), 12 (B) Be(OH) and Al(OH), 12 (C) Be(OH), and Al(OH), 3 (D) Be(OH), and Al(OH), 11 13

Natural Ca.SO4.2H20 is heated above 393K (close to 473K), the product is (A) Quick lime (B) plaster of Paris (C) Dead burnt plaster (D) a mixture of all

A metal M forms water soluble MSO, and amphoteric MO. The metal M is (A) Be (B) Mg (C) Ca (D) Sr

1. Assume the market for knit caps (i.e. Q knit caps) is perfectly competitive and is estimated to be as follows Market demand QD 16,000 3000P. Qs 1000P. All sellers are identical and have the short run cost function C 30q0.1q. (Both Q and q are in thousands). a. Compute the firm profit maximizing quantity. b. Compute total revenue, total cost

Anhydrous MgClz is obtained by heating hydrated salt, MgCl2.6H20 (A) Strongly in air (B) In presence of excess of H2O(vopour) (C) with conc. H2 SO, which absorbs moisture (D) In presence of dry HCl gas