Chemistry Questions and Answers June 11, 2020

Carbon 3000 kg with an initial temperature of 1100 C is flowed with steam, until the temperature of the carbon drops to 850 C. While the average temperature of the gas leaving the generator is at 850 C. The analysis of the gas coming out is as follows CO2 43.1 CO 13.35 N2 41.55 SO2 2 How much steam is needed if it is considered that all the

Balance the reaction between Ni and CIO to form Ni and CIO, in acidic solution. When you have balanced the equation using the smallest integers possible, enter the coefficients of the species shown. Ni CIO, Ni2t CIO, Water appears in the balanced equation as a (reactant, product, neither) with a coefficient of (Enter 0 for neither.) How many

Provide the stable organic product(s) for the reactions below. Only show one repeating unit of the polymer. polymerize CI H2N. NH2 polymerize CI ,Predict the Product. Provide the stable organic product(s) for the reactions below. NaOH H20 NaOH H20

Sulfur dioxide and chlorine gas react exothermically to give sulfuryl chloride. SO 2 (g) + Cl 2 (g) SO 2 Cl 2 (g) K c = 22.2 at 648 K. If SO 2 (1.370 M) and Cl 2 (1.115 M) are allowed to react at this temperature, calculate the equilibrium concentrations of all reactants and products.

Aldehydes and Ketones 9. 94 C. Solubility, Iodoform Test, and Benedicts Test 5. Oxidation (yesno) 1. Soluble 2. lodoform 3. Methyl 4. Color (UATEA Test Ketone RAPANA YeS Benzaldehyde VERY NO ORANGA YES SLI6HT Cuzo YEr No ORANGE Acctone YES SHI3 NO Cyclobexanone VERY SulGHT NO No Unknown YES 6. Identify the unknown as propanal, benzaldehyde,

What are correct coefficients for reactants and products when following equation is balanced N2H4 (g) H202 (g) N2 (g) H20(g) O 1,2,1,4 O 2,1,4,1 O 2,1,2,4 O 4.1.2.1 O 1,4,2,2

Which one of the following is not a redox reaction O Zn(s) H,SO,laq) ZnSOa(aq) H2l3) O 6FeSOglaq) K2Cr,O(aq) 7HSo,laq)Cr(SOa)(aq) 3Fe(SOaa(aq) K2SO,(aq) 7H2O0 O H2O() NH3s) NH (aq) OH (aq) CO 2H2(3) Oz(3) 2H20) O Chs) 2KBrlaq) Br2() 2KCI(aq)

Which one of the following is a redox reaction O 2Na(g) Cl2s) 2NACI(s) O NazCO,(s) 2HC(aq) 2NAC(aq) CO,(g) H,O) O Ba (aq) SO (aq)BaSO ls) O K,Cr,0,laq) 2KOH(ag) 2K,CrOlaq) H2O O H2O)H(aq) OH (aq)

Determine the reducing agent in the following reaction. 2 Li(s) Fe(C2H3O2)2(aq) 2 LIC2H3O2(aq) Fe(s) O Fe OC OH OLi

Using the data plot ((Vo V,ta)10((E2E1)S)) vs (CV).ta and determine the concentration. Istd Total Volume of Standard Millivolt (mv) Volume sample (Vo) Added (ml) Volume standard 0.5 18.5 50 2 21.4 52 4 25.9 54 6 27.5 56 8. 23.7 58

Biotin play a central role in fatty acid synthesis O F

Vitamin A is nonessential to night vision O F

The element needed in quantities greater than 100 mg for human beings is Calcium O T O F

In extra cellular compartment, the fluid present in mlkg of body weight is about 220 mlkg O T O F

Complete the reaction map below.

OH E Hz HBr B A Lindlars HO2 catalyst H20 .CI D

Identify the compounds produced in these reactions. Warning Do not attempt to deduce the structures from the starting materials but use the data These molecules are so small that you can identify them from HNMR alone. RCO3H LII NANH2 A B tBUOH Compound A SH(C4H6) 5.35 p.p.m. (2H, s) and 1.00 p.p.m.(4H, s). Compound B 8H(C4H6O) 3.00 ppm (2H, s),

Often radiological bombs (referred to as "dirty bombs") are better described as "weapon of mass disruption," as the radiological exposure effects to any individual not in the immediate area of the detonation is limited. In fact, the explosion itself eclipses the radiological effects for those in the direct vicinity of the incident. From your

How does the content on elements and compounds relate to something you are interested in? Describe that connection to the rest of the class and be sure to include a relevant photo or Weblink. We live in an atmosphere of 21% oxygen. A match burns in less than a minute, a fireplace consumes a small pine log in about 20 minutes, and we exhale about

Define well stimulation and differentiate between matrix acidizing and hydraulic fracturing, give any six.

Give reagents and reaction mechanisms to show how compound 23 can be converted into 24 using benzotriazole chemistry. 23 24

Deduce the structures of and fully rationalise, with the aid of mechanisms, the formation of the products 20, 21 and 22 from the following reaction sequence. Ph Li 21 H THE N PhMe CHO 20 NH NaSPh 22 ELOH

(e) Identify the structure of compound 19 and explain its formation with the aid of a reaction mechanism. (i) PHCOCI, NACN, H20, CH2CI2 19 C20H17NO2 Me N (ii) NaH, THF,

Draw the structure of (2Z,5Z)3bromohepta2,5diene. Br A) B) Br C) D) Br Br

Assess what particular chemical weapon poses the most significant threat to the United States; analyze the means by which state or non-state actors could make or acquire this specific chemical weapon; and hypothesize the physiological, psychological, and social impact of an attack using this weapon. Consider both recent uses of chemical weapons in

Consider the reaction HCl(ag) NH, (ag) NH,CI(aq) Where 20.00 mL of 0.100 M NH, (aq) is added to 10.00 mL of 0.200 M HCl(aq). Order the solution components (excluding water) from highest to lowest concentration. O OH NH, Na Cl H,0 O (CI NH NH, H,O OH O H,0 Cl NH, NH OH O INH OH H,O CI NH, O H,0 CI NH, NH OH O INH,CI NH, HCI O CI

What is the product of the following reaction 1. BH3 2. H2O2, NaOH 3. SOCI, 4.0 5. Pd, H2 6. O3 7. (CH3)2S

Which Newman projection depicts 1,2dibromoethane in its lowest energy conformation H Br Br Br ,chon onpcts 1.24bromoethane in its lowest energy conformal Br Br. Br Br H, H. Br Br H. H, H H. Br C OA OB OD

Propose a sequence of steps to synthesize for both A and B.

a) Br b) hstry 14 tional P 0

We have a sample of tomatoes we want to test for iron, what technique do you use to determine iron

Consider the reaction HNO2(aq) HO(1) NO, (aq) H30(ag) Which of the following statements will decrease the amount of work the system could perform (a) Increase the concentration of the HNO2 (b) Decrease the concentration of the HNO2 (c) Add H30 to the solution (d) Add NO, to the solution O (e) Selectively remove NO,

Q3 For a Particle The Sor face on fa Sphore. 2) () Find an eapressim for DE E t 3D f The transihon forom lo2 lis Occus at 125GH2 3. End The t fre quency absyptin forom lle for tron sition from balo

Given are three columns first column in number of workers, second column is total product and third is total cost. number of workers-- 1 / 2 / 3 / 4 / 5 / 6 / 7 / total product---------- 8 / 20 / 35 / 45 / 52 / 57 / 60 / total cost Php. ........80 / 200 / 350 / 495 / 624 / 741 / 840 / a. Add column to the table and enter the marginal

Complete the equations

vii. viii ix. X. xi. xii OH Pd(OAC) KPO4 lonic liquid 130C F3C the H TBS Pd(OAC) AgCO Phosphine ligand OH 2. BnO. Pd(OAC)2 AgCO Cyclohexene NMP Pd(PPH3)4 Bu SnCl Cul CsF, DMF, 45C se d

What is the product of the following reaction HO CH2CI2 ,reaction HO HC A C ,HO LOH No Reaction E D.

Use the following information to answer the next question Compounds benzene butane 3. ethene ethanol Numeric Response 1. Arrange the above compounds from most stable to least stable and (Record your fourdigit answer in the numericalresponse section below.) Your answer 1. 2. 4.

Draw the molecule arginyl-alanyl-histidyl-cysteinyl-isoleucyl-asparagine at pH 7. List the name of the entire functional group (R) and the pKa (if appropriate) under each amino acid side chain you draw. Show every compound such as hydro and carbon ex: h3c would be h-h-h-c

Compare p-toluenesulfonic acid and Amberlyst-15 as catalysts that can be used to synthesis Methyl Diantilis. In a paragraph summarize and explain the differences between these two catalysts. This summary should include both differences of chemical principles and laboratory practicality.

Test each listed substance with the five indicators. Determine the pH for the substance and record. red litmus (acidbase) (acidbase) (Hydrion) blue litmus phenolphthalein universal reported (color indicates) pH paper (whole number) Indicator (whole number) pH 1. 0.1 M HCI change Yed no Color ess 2. 1.0 M HCI no change red 0.0 Color tess 3. 0.1 M

(a) List the different properties of colloidal dispersions and briefly describe each property. (b) Identify the forces that keep colloids dispersed in a liquid and describe the process. (c) Colloids are categorized into classes based on how the particles interact with the dispersions medium. Describe the two main classes of colloids.

(1) Estimate the solubility of silver chloride at 25C in (a) pure water in moles per litre (b) pure water in grams per litre (c) the presence of 0.50 M AgNO3(aq) solution (12) (2) Will a precipitate of PBSO4 form in a solution containing 0.15L of 0.008 M Pb(NO3)2 and 0.30L of 0.005 M K2SO4 (7)

Use the standard electrode potentials given in the following table to answer the questions below HalfReaction E V Lit Li 3,04 e Mg2 2e Mg 2,37 Zn2 2e Zn 0,76 Fe3 3e 2 Fe 0,4 Pb2 2e Pb 0,13 2H 2e H2(g) 0,00 Cu2 2e 2 Cu 0,34 Ag Ag 0,80 e Au3 3e Au 1,50 ,(a) Which of the metals on the list can reduce Mg2(aq) to Mg(s) Explain your

Compare a lead storage cell with a fuel cell. Use chemical equations and appropriate diagrams to describe the functionality of each type of cell.

(a) Describe the chemical processes that takes place when iron rusts (b) Explain how electrochemical processes can be used to prevent the corrosion of iron.

Consider the use of a solution that is 0.0322 M EDTA in the titration of a 50.00 mL of a solution that is 0.0129 M in Cu2+. The solution is held at a pH of 10.00 and is buffered in 0.050 M ammonia. Cu2+ (T = 20 oC, n = 0.1 M) Log K1=18.80 (a) What is the value of K"f for this solution? (b) What is the concentration of [CuY2-] at the equivalence

(i). Derive the formula for BeerLambert Law starting from transmittance, T. (ii). A 3.28 x 105 M solution of calcium sulfate has a transmittance of 37.2 when measured in a 2.10 cm cell at a wavelength of 534 nm. Calculate A. the absorbance of this solution B. the molar absorptivity of calcium sulfate

Let, the Radius of a Carbon atom is 0.070 nm. Calculate the number of atoms per nm on the (010). (110) and (111) planes for Diamond. Clearly draw the planes for your ecalculation. (2D drawings will be enough)

Starting with 22.5 moles of O 2 in a bottle, calculate the volume of O 2 the bottle could deliver to a climber at an altitude where the temperature is 38.0C and the atmospheric pressure is 0.342 atm.

The molar enthalpy of vaporization of benzene at 353.25 K is 30.8 kJmol. Calculate the duration in seconds required to vaporize a 10 g sample using an electrical heat source operating at 12 V potential and 0.50 A current.

Determine the type(s) of tertiary cross links (list all that apply) that can be formed between a. Asn and Ser b. Phe and Phe c. Asp and Lys

2. Consider the chemical equation 1 N, 3 H, 2 NH, For the 3 scenarios below, predict which one will produce the most ammonia, and predict which ones will have leftovers. 10 A resctarts B Teactants reactarts Explain your reasoning Now check your predictions using the Real Reaction tab. Do the results make sense Revise your answers or reasoning as

A 3.38 gram sample of an unknown gas is found to occupy a volume of 1.40 L at a pressure of 946 mm Hg and a temperature of 44 C. The molecular weight of the unknown gas is gmol. Assume ideal behavior.

Suppose you have two samples that are equal in weight, 37.8 g Sr and 37.8 g Al2O3 . Calculate the number of moles of each substance. 37.8 g Sr= 37.8 g Al2O3=

Calculate the number of electrons in the following complexes using covalent model. (i) (ii) H3 CH3 H3C (10 marks)

After you complete the seminar, complete the drawing challenge, Your drawing should pull together key ideas from chemistry and biology and be able to clearly communicate your hypothesis. Using colored pens or pencils would be a great way to show charges and other features in your drawing. Remember that creativity is essential to good sciencel Your

escapements gears lever weights chain bob pendulum Old mechanical grandfather clocks (left) have a pendulum that is driven by falling weights. In theory, it takes a week for the weight to reach the bottom of its run, and then you have to pull it up again. Someone had a clock that, when wound up on Sunday, would stop sometime in the middle of the

Propose a structure for a compound with molecular formula CaH10O2 and the following 1H NMR spectroscopy chemical shifts and multiplicities. (For full credit, show your work, calculate HDI, assign each peak to the protons of your structure and give your reasons specifically) At 1.2 ppm (triplet, 3H) At 2.10 ppm (singlet, 3H) At 2.56 ppm (quartet,

Determine the retention time, fg, of the analyte if a column of the same length with a 0.146 mm diameter and a 0.468 m thick stationary phase of the same composition and at the same temperature is used for the separation instead. IR 10.87 Incorrect min,On a 0.146 mm diameter column with a 0.935 m thick stationary phase, an unretained solute

Draw the net magnetization of protons hydrogen when the first excitation pulse is 30 degree followed by 180 degree (Note) use primed Reference Frame.

Refer to Figure 2-30 and the discussion about updating master files from transaction files. The discussion presents the record structures for a sales transaction. Prepare a diagram (similar to Figure 2-30) that presents the record structures for the receipt of cash from customers who are paying their outstanding accounts receivable. Assume a cash

FIGURE 230 RECORD STRUCTURES FOR SALES, INVENTORY, AND ACCOUNTS RECEIVABLE FILES Record Structure for Sales Orders Transaction File (PK) (SK) (SK) Sales Order Number Account Inventory Quantity Number Unit Price Invoice Amount Number Sold (PK) Record Structure for AR Master File Last Account Number Address Current Balance Credit Limit Billing Date

When adding 5 g of silver chloride, silver carbonate, strontium sulfate, aluminum hydroxide and strontium iodate (each species into a different flask) to 100 ml of distilled water state their chemical equation with included states. Also, write the dissociation reaction of each species of solids studied. Write the equilibrium expression for each of

Another polluted gas stream with 600 g/m3 of particulate matter (PM2.5) is flowing into the 10-compartment baghouse filter at a rate of 1500 m3/min. The maximum filtering velocity for particulate matter is 2.5 m/min. Given that every m2 of bag fabric can remove 0.5 g of particulate matter. Demonstrate the design of a baghouse that can remove more

what Is the mz that is fund through alpha cleQ wage 2. Illustrare a fragmentation method to Show positive and neutral stuctR. a mao spectrometer which when looking at can you see ,HO Use the Fonawing h ansuer thre qvestions betow. the Following albyteral above fam heat asthma HO.

Name of the carbon whose functional group participates in the glycosidic bond _____________, name of the sugar, if it is free________________.

Cal Poly students conduct a senior project on a new class of ionic compounds that are recently discovered on the dark side of the Moon. These salts are similar to those found on the Earth and are composed of cations and anions. The ionic radii of these salts have been determined as shown below Cations Do2 Re2 Mi3 Fa3 lonic radii (pm) of cations

Carbon monoxide and chlorine gas react to produce phosgene (COCI,) gas according to the following reaction at 100.0C CO (g) Cl2 (3) COCI, (g) K, 1.49 x 10 In an equilibrium mixture of the three gases, Pco Pan 2.55 x 10 atm, what is the equilibrium partial pressure (in atm) of phosgene Express your answer below in decimal form (you will not be

Which of the following statements isare false for the pH of a 0.01 M Na PO, solution versus the pH of a 0.01 M in FeSO4 solution (Select all that apply) O The activity coefficient for H is smaller in 0.01 M Na PO, than in 0.01 M FESO4. The OH activity in 0.01 M Na PO4 is not equal to the OH activity in 0.01 M FESO4. The H activity in 0.01 M Na3PO4

Which of the following cyclohexane conformations has the MOST energy (is the LEAST stable) a. Chair b. Halfchair C. oat d. Twist boat

Which of the alkanes listed has the highest boiling point a. Hexane b. 2Methyl pentane c. Pentane d. 2Methyl pentane

Identify the functional group of the following molecule below. CH.CH2OCH2CH3 a. Ketone b. Aldehyde c. Ether d. Ester 3.

What is the CORRECT name of the compound a. Cis 1,2 dimethylcyclohexane b. Trans 1, 2 dimethylcyclohexane c. Cis 1,3 dimethylcyclohexane d. Trans 1, 3 dimethylcyclohexane

What is the IIUPAC name of the structure shown below a. 2,2,3 trimethyl butane b. 2, 3,4 trimethyl pentane c. 2( 1 methyl ethyl )3 methyl butane d. 2isopropyl 3methyl butane

6. Which of the following compounds are chiral 1,1Dichloropentane b. 1,2Dichloropentane 3Chloropentane d. 2,3Dichloropentane a. C.

7. The balanced equation for the combustion of pentane is a. 4C5H12 2 02 20CH4 4H2O b. 2 C3H8 O2 CH4 2H20 c. C5H12 8 02 5 CO2 6H2O d. C3H8 5 02 3 CO2 4H2O

8. Which of the compounds below is a disaccharide a. glucose b. cellulose c. maltose d. ribose

Which term below best describes the mechanism of the following reaction HO, HC1 CHOH a. SN1 b. SN2 . 1 d. E2

10. Which of the following occurs during the initiation stage of a radical mechanism a. Nonradicals are formed from radicals. b. Radicals are formed from other radicals. c. Radicals are formed from nonradicals. d. Nonradicals are formed from other nonradicals.

The correct geometry around oxygen in CH3OCH3 is. a. linear. b. bent. c. tetrahedral. d. trigonal planar.

12. Which of the following will NOT convert 1butanol into 1chlorobutane in one step a. SOCI12 b. P . C d. CC14

From the perspective of viewing down the C2 C3 bond, what is the Newman projection of the most stable conformation of 2,3dimethylbutane CH3 CH3 CH, CH3 H CH3 CH3 H H. H CH3 CH3 H CH3. CH3 CH3 CH3 II a. I only b. Il only c. I and III d. I and II

14. Which one of the following is carbanion a. CH3 b. CHOH c. CH3 d. CHOH2

15. Which of the compounds below cannot exist as cistrans stereoisomers a. 2pentene b. 2methyl2pentene c. 3methyl2pentene d. 4methyl2pentene

Differentiate between (1) Thermoplastic and Thermosetting polymers (ii) LDP and HDP polymers

Draw the structure that corresponds to the following name. Nylon 6, 6, Bakelite

Draw the chemical structures of all possible products of the following. (i) SOCH OH HO. R X. (iii) HBr (iv) CO2 MgX 2) H (v) CH 1. ether CH,CH,MgBr 2. , ,(vi) CH, of AICI, CCI heat (vii) CH,OH Conc.H2SO4 (vii) 2 HBr CH,CH,CCH

For each of the following pairs, state which would display a higher boiling point. Give reasons. (i) Pentanoic acid or 2methylbutane (ii) Propanal or 2chloropropane (ii) Butanone or 1propanol

Identify CORRECT reagents required for reactions below. (i) CONFIDENTIAL (ii) OH (iii) NH2 (iv) Br OEt

The following compound shown below was subject to the reaction with Br2 using CHOH as solvent. Show the formation of the final product(s) with the correct stereochemical outcome by providing plausible reaction mechanism. Br2 CH3OH

Treatment of the following stereoisomer, 1bromo2,3diphenylpropane, with sodium ethoxide in ethanol gives stereoisomer of 1,2diphenylpropene. a) Predict whether the product is a Zor Eisomer. b) Show the complete mechanism for the product formation. H3C H CHs CH3CH2ONA H (CeHs)(H3C)CCH(C6H5) Ethanol Br

(e) Draw the mechanism of an acylation of Benzene. (5 marks) 9

The following formula is correct, but the name is not, write the correct name Ag, PO4 Gold(I1) Phosphate

Each of the following statements below is written in reference to reactions (SN1, SN2, E1 and E2) of alkyl halides. State not more than two, that is (or are) most consistent with each statement It involves carbocation intermediate. (i) SN1 SN2 E1 E2 It is first order SN1 in alkyl halide and first order in nucleophile. (ii) SN2 E1 E2 It involves

(g) Provide the missing reagents in the following reaction sequences. (8 marks) NH2 OH A 1. LAH B 2. H3O E NH2 to F . D HO. OEt H

Differentiate the following (1) Saturated and Unsaturated fat (ii) Nucleotide and nucleoside (iii) Starch and cellulose (iv) Alpha glucose and Beta glucose (v) Acid amino acid and basic amino acid

Illustrate the formation of DNA molecule

Discuss the structure of protein. (Primary, secondary, tertiary, and quaternary structure)

Heating of the following compound results in two successive sigmatropic rearrangements Claisen reaction followed by Cope reaction. (i). Determine the structure of compounds A and B. (ii). Show the electron movement in forming the respective compounds. (ii). Label the o bonds that are formed in each reaction. Claisen A p

Give the IUPAC nomenclature of the following compounds. (i). OH (ii). H,C CH3 (ii). OH CH3 H (iv). H,C CH3 (v). H,C CH, OH

1. In the chemical reaction below the enzyme E is a catalyst that converts a raw material S to product P but itself Does not change. As follows (1) Reaction SE PE 1.1) (Suppose in order for a product to be produced, n molecules of the raw material must be bonded to the enzyme. Write a function of the food as follows. Parameters e and Vm are equal

A tetrapeptide consists the following amino acids sequence AlaAspLys Val Using the pK values from Table 4.1 page 91 (shown below), fill the table by writing the net charge for this tetra peptide at the following pH values. If required, you need to write the net charge with the correct sign or pH value The net charge for the given peptide pH 1

Match each set of reagents reacting with to a major product below. Answers may be repeated. The squiggly ( ) means a mixture of wedge ( and slash ( ). lis iodine. g. NaOH and heat Choose.. Choose. HI and heat Nal in acetone HI KOC(CH), and heat fnilnwing reaction seauence D deuter um, an isotope of hydrogen, Chiral products are racemic