Chemistry Questions and Answers June 23, 2020

6. The electrolysis of an aqueous solution of KBr has the overall reaction 2H,0 2Br (aq) H(g) Br2(1) 20H(aq) During the electrolysis, 0.497 mol of electrons pass through the cell. a. How many electrons does this represent b. How many electrons does this represent c. Assuming 100 yield, how many liters of H2 and Br2 are produced at 25C and 0.997

Explain the differences between monomers, oligomers, and polymers. Draw examples of each. Homopolymer and copolymer rubbery amorphous state and glassy amorphous state

What are the mechanisms that can produce short chain and long chain branching? polymer

What characteristic functionality is required in a monomer to produce a polymer via addition polymerization?

What is the difference between a rubber and a plastic? Why are they both polymers? Name at least three characteristics of polymers that exhibit statistical distributions.

What is meant by the term molecular entanglement? Give the two types of polymerization and their alternate names. State the characteristics of the monomers used for each type of polymerization.

Give the two types of polymerization and their alternate names. State the characteristics of the monomers used for each type of polymerization. Describe the fundamental differences between the chemical mechanisms of these two types of polymerization

Name three polymers made by each of the two types of polymerization. Draw the structure of their monomers.

Name the four sub-types of chain growth polymerization. Give two examples of polymers made by each of the types of addition polymerization

Name the four mechanistic stages of chain growth polymerization. Draw a general example of each.

How do thermosets differ from thermoplastics? What is a living polymer? What sort of copolymer can be made from it?

The fluorescence quantum yield for phenanthrene is 0.12, and the rate constant for the intersystem crossing from singlet to triplet is 0.260 s at 77 K. Assume that no quenching and no internal conversion from the singlet state occurs. Detemine the lifetime of the singlet state (T). A) 3.4 s B) 1.4 x 107s C) 9.5 x 10s D) 7.4 s E) 9.5 s

Write the net ionic equation for the following molecular equation. 3CuCl,(aq) 2K3PO,(aq) Cu3(PO,)2(6) 6KCI(aq)

A metallurgist wants to chromium plate his cars hood ornament. The ornament has a surface area of 13.64 in. He wants the chromium plating to be 0.0040 in thick. a. How many grams of chromium (d 7.19 gcm) are required b. If a current of 9.00 amperes is used, how long will it take to plate the ornament using a solution of CrCls as a chromium source

Calculate the E, G and K at 25C for the reaction,

2Mno, 4H Cl, 2Mn2 2C105 2H20

What is the major organic product obtained from the following reaction NaOCH, CH3OH

What is the major organic product obtained from the following reaction 1. KCN 2. H

How could you distinguish between 1butanol and diethyl ether by infrared spectroscopy 1butanal diethyl ether both C,H100

Why is the group of polyketide compounds often referred to as acetogenins? Draw the biosynthesis of the formation of rhein (3) from acetyl Co-A!

. (3)

PepsiCo operates 45 plants, 490 distribution centers, warehouses and offices located globally, Australia, Chile, and Uzbekistan are being considered as a potential markets for PepsiCo top global brands and everyday nutrient products. As a senior executive for PepsiCo you and your team have decided to adopt the four strategies in the Ansoff matrix

Given the following equation Znts) 02e ZnO(s) If 35.0 g of Zn is reacted with 70.0 g of O 2 determine the liniting reactant. Note balance the chemical equatioa before you perfom any cakulation. For the toolbar, press ALTF10 (PC) or ALTFNF10 (Mac). BIUS Paragraph Arial 14px A E E X X, 99 2

would you need to compound 60 grams for lab this week Petrolatum (White) 6.

Calculate the mass in grams of aluminum iodide (All3) when 21.10 g of aluminum (Al) reacted completely with iodine (1) according to this equation 2AI 3122All3 A) 318.8 g B) 167.7 g 456.7 g 1 Point 323.0 g,Calculate the mass in grams of aluminum iodide (All3) when 21.10 g of aluminum (Al) reacted completely with iodine (1) according to this

According to Burke, the device(s) that triggered a medieval industrial revolution was (were) a. a new loom b. The cam O c. The spinning wheel O d. All of the above e. None of the above

4 gram mixture of NaOH and Na2CO3 is equimolar, if it contain X gram of NaOH and Y gram of Na2CO3, then value of X is

Predict the major product of the following reaction. BH, H,O2, HO 1. Name the reactant 2. Is this a Markovnikov or Anti Markovnikov product 3. Does this reaction occur syn, anti, or both 4. Name the product 5. Draw the product on your file upload. Submit this file within 15 minutes of your quiz submission.

4 gram mixture of NaOH and Na2COa is equimolar, if it contain X gram of NaOH and Y gram of Na2CO3, then value of X is

Explain how you would synthesize each of the following compounds from Robinsons ring. H3C. (a) (b) (c) Ph CH3

Using retrosynthetic analysis, provide a synthesis for the following molecule. Place the required reagents next to the arrows and the necessary intermediate in the box provided. CF3 1. 2. 3.

What two compounds (1 pt correct 2 compounds) would you use to synthesize the following amide Draw and upload the structure of each making it clear which structure is which. What commonly occurring molecule did you need to add across the amide bond to break the molecule into two (1 pt)

Predict at least one metabolite for each of the following compounds. I. CH3 H, N. H CH3 I. ONCCH2 OCH3 H CH3 HO HNCCH3 3D 3D

Calculate the pH of the water and buffer solutions with the additions of HCl and NaOH.

M, V, MV2 Water M2 Initial pH 7.0 pH after 0.5 mL HCI or NaOH pH after 1,0 mL HCI or NaOH pH after 1.5 mL HCI or NaOH pH after 2.0 mL HCI or NaOH HCl addition NAOH addition 1.61 1.32 16.15 1 04 12.39 14.32 15 I6 15 04 Buffer Initial pH 4.77 pH after 0.5 mL HCl or NaOH pH after 1.0 mL HCI or NaOH pH after 1.5 mL HCl or NaOH pH after 2.0 mL HCl or

Explain the rules as simply as possible?

7. What is the IUPAC name of the following compound NH2 . 3,6Dichloroaniline . 2,5Dichloroaniline . 2,5Dichloroaminobenzene CI D. 2,5Dichloroanisole

What is sulfenate anion catalyst?

The plot below shows the data collected for various samples with different of hydrogen peroxide at 1.00 atm and 298 K. On the plot, locate the value of the volume in mL of O, that you collected in your experiment, then record the corresponding of hydrogen peroxide. vo, (mL) vs H,0, 100.0 90.0 80.0 70.0 E 60.0 50.0 40.0 30.0 20.0 10.0 0.0 2. 5.

Sulfuric acid is a diprotic acid that is also a fuming acid in concentrated form. A sealed container of concentrated sulfuric acid will have not only the the normal acid equilibrium with water but also an equilibrium with gaseous sulfur trioxide. Explain how these different equilibrium would interrelate and produce a very complex equilibrium.

You place 5.5 L of water and 60 g of liquid nitrogen (liquid N2) in a 16 L box, seal it, and bring the temperature to 25C. Given that the equilibrium vapor pressure of N2 at this temperature is greater than 10 atmospheres and that KH 7.0x10 M atm for dissolving N2 in water at 25C, how many moles of N2 will be in the aqueous phase when the system

For 510.0 mL of a buffer solution that is 0.125 M in HC2 H3 O2 and 6.50x102 M in NaC, H3 O2, calculate the initial pH and the final pH after adding 1.5x102 mol of HCl. (Ka (HC2HO2) 1.8 x 105.) Express your answers using two decimal places separated by a comma. pHinitial pHfinal

Show that the electrical of NaCl solution is k Conducting FC (CNa DNa Cal Da 3 RT where CNa Concentration of Na of Cl Na Na Concentration Dita Diffusivity Diffusivity of Cl Ts tempt. Rs Universal gas Cel Also, Find the value of K for NaCl solution Given, Nall solution is 1 by weight. Dep 16X109 ms ms 116 X 10 Dita T 300 K R 8314 of

Using the standard curve below, estimate the amount of bacteria in an E.coli sample that exhibits an OD600 of 0.09. 0.2 0.15 0.1 0.05 0.25 05 Gacterial Number (x 10 ces) (dont forget units) Optical Densitye 600 nm

Use the formula listed below to calculate how much Salicylic acid should be used to make 20 L of GC Insect Repellent 400 g Benzocaine 160 mL Methyl salicylate Salicylic acid Isopropyl Alcohol NF, 99 5,840 mL Pure water qsad (1 Point) 40 g 8000 mL 50 g 100 g 125 g 60 g 150 g

Qualitatively plot a graph of strain energy vs. torsion angle for a full 360 rotation about this CN bond. Define the torsion angle by the two C atoms, one N atom, and one H atom of dimethylamine as shown in blue. H. H CN CH3 H.

What is meant by the term molecular entanglement. (in Polymer topic)

Name the four sub-types of chain growth polymerization. Give two examples of polymers made by each of the types of addition polymerization

4. give an example of the application of composite materials in chemistry and answer the following questions. a) explain the reason for choosing the matrix (primary phase) and reinforcement (secondary phase) of the materials b) what properties are required by the composite material in that application c) describe the interaction between the

4) The following reaction has four potential products, but only one is shown in the NMR. Draw the (single) product formed and label the NMR peaks. HBr D 3H E 3H F 3H 1H A 1H 2H 6. 4 3 2 PPM

Methyl alcohol can be prepared commercially by the reaction below. co(g) 2H2(g) CH,OH(g) For the reaction at 200C, the equilibrium concentrations are CO 0.60 M, H2 0.13 M, and CH,OH 0.43 M. What is K, for the reaction

A cylindrical tin can is to be manufactured so that it will hold a specific volume V. If the materials for the ends of the can are twice as expensive as materials for the sides, what shape of can is most economical to manufacture Find h in terms of r. Let the cost c per cm, h is the height of the cylinder and r is the radius of the cylinder. You

Based on the given picture, explain why is the form of energy convert from chemical to mechanical, mechanical to electrical, electrical to thermal and thermal to light V Energy Symbolst Forms of Energy Machanical Electrical Thermal E Light Chemical Generator

Example of an object that transform or convert light energy to other energy Light energy to mechanical energy, Light energy to heat energy, Light energy to sound energy, Light energy to chemical energy and Light energy to electrical energy.

What products are formed when all of the amide and ester bonds are hydrolyzed in Oseltamivir Draw all the products. H NH2 Oseltamivir ,What products are formed when all of the amide and ester bonds are hydrolyzed in Oseltamivir Draw all the products. H NH2 Oseltamivir ,What products are formed when all of the amide and ester bonds are hydrolyzed

When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO, (s) 2 HCI(aq) CaCl, (aq) H,O(1) CO,(g) How many grams of calcium chloride will be produced when 30.0 g of calcium carbonate is combined with 13.0 g of hydrochloric acid

Which among the metals in Part B serve ad a. crificial anodes b. noble coatings

17) An insulated tank A of volume 1 m3 initially contains air(ideal gas, =1.4) at 10 Mpa and 300 K. this tank is connected through a valve to another insulated tank of volume 9m3 which is evacuated the valve in between the two tanks is opened till the pressure in both the tanks equalizes and then closed. Determine the pressure and the temperature

One mole of an ideal gas is compressed adiabatically in a single stage with a constant opposing pressure equal to 1.00 MPa. Initially the gas is at 27C and 0.100 MPa pressure; the final pressure is 1.00 MP a. Calculate the final temperature of the gas, Q, W, U, and H. Do this for two cases : Case I. Monatomic gas, Cv = (3/2)R. Case 2. Diatomic

0.50 mole of CH3Br and 0.75 mole of H2S are injected into a 1.00 L reaction vessel at 500 K. CHBr(g) H2S(g) CH,SH(g) HBr(g) K, for the reaction at 500 K is 0.33. What are the equilibrium concentrations for each of the species in the reaction

Methyl alcohol can be prepared commercially by the reaction below. Co(g) 2H2(g) CHOH(g) For the reaction at 200C, the equilibrium concentrations are CO 0.60 M, (H2 0.13 M, and (CH,OH 0.43 M. What is K, for the reaction

Complete the table H) OH pH 4.3 x 104 M 8.90 1.5 x 1011 M 4.22

Calculate the Ksp for each of the salts below (a) 0.35 g TICI100 mL solution (b) 1.35 g Cu(I03)2L solution

SOLVE THE FOLLOWING

Sheet of current Hoi Then figure out the following limiting cases Consider an infinitesimal wire of width de at position a, magnetic field for this sheet of current at point P is B tan x0 a

Which of the tape rulers could be used to measure change in water height at the end of each heating time interval in the new experiment Select all that apply 1 mm scale Which tape ruler would you select to use for the new experiment 2mm Explain your reasoning for the tape ruler you choose above. mm scale 10 mm scale scale 2 mm scale 5 mm 5

What temperature would result in the same sample exerting a pressure of 300 atm

In an industrial process, nitrogen is heated to 500 K in a vessel of constant volume. If it enters the vessel at 100 atm and 300 K, what pressure would it exert at the working temperature if it behaved as a perfect gas? What temperature would result in the same sample exerting a pressure of 300 atm?

A combination of 1.45 g Zn with 25.0 mL of 1.5 M HCI, initially at 18C, results in an exothermic reaction. What volume of hydrogen gas can be collected over water at a total pressure of 755 mmHg Hint look up vapor pressure of water at the final temperature the reaction reaches. Zn (s) 2HCI (aq) H2 (g) ZnCl, (aq), AH 153.9 kJ

The antacid component of Tums is calcium carbonate. Assume Tums is 40.0 percent CaCO 3 by mass. If we have 400. mg of Tums how many ml of 0.100 M HCl can we neutralize? Express your answer in mL.

A group of seven students (Harry, Rosa, Ahmad, David and Nancy) has decided to talk with the Computer Science Department chairperson about having the Department offer more courses in object-oriented programming. The chairperson has said that she will speak with three of the students. In how many ways can these seven students choose three of their

oocCH2 EDTA is a hexaprotic system with the pK values 2.00, pKa4 2.69, H2CCoo pKal 0.00, pKa2 1.50, pK23 NCH2CH2N 3D 3D pKas 6.13, and pKa6 10.37. 3 oOCCH2 The distribution of the various protonated forms of EDTA EDTA (or Y4) will therefore vary with pH. For equilibrium calculations involving metal complexes with EDTA, it is convenient to

Suppose I have a Pt disk electrode in a solution of Cu 2+ plus 0.1 M KCl versus a saturated calomel electrode (ESCE = 0.242 V). If the E 1/2 for Cu 2+ reduction is at 0.100 V vs. SCE, what would the E 1/2 be if I added 0.10 M NH 3 and the following reaction occurred: Cu 2+ + 4NH 3 ----------- Cu(NH 3 ) 4 2+ K = 1.1 x 1013

Provide the reagents that would be necessary to form the indicated products. HN N. N)

Nomenclature lonic Compounds containing Polyatomic compounds Nomenclature Ionic Compounds containing Polyatomic compounds Give the correct formulas for these compounds copper(II) nitrate iron(II) sulphate gold(III) chlorate Ace Ccr)S copper(I) hydroxide Fesoy manganese(IV) bicarbonate gold(I) sulphate Ammonium bromide Ammonium sulphate

Draw the structure of the hydration product of the compound below. CH3 H2O Acid catalyst CH3 You can use a software (ChemSketchChemDraw) or hand draw. Figures uploaded sideways or upside down will receive no credit. If more than one structure is uploaded, credit will be given only for the first one.

1) Draw a correct structure of a diol with the following criteria. a) It must contain a saturated cycle. b) It must contain a secondary alcohol. c) Also, it must contain a tertiary alcohol. You can use a software (ChemSketchChemDraw) or hand draw. Figures uploaded sideways or upside down will receive no credit. If more than one structure is

Peter prepared an aqueous solution of a soluble compound (a nonelectrolyte) by dissolving 7 24 g of the compound in enougn water to make 1.00 L of solution. The osmotic preSsure of this solution is 0.812 atm at 297 K. What is the molecular weight (gmol) of the compound Write your answer with 1diat after the decimal point.

Consider the following molecule Br HO OH a. What is the maximum possible number of stereoisomers for this molecule b. Draw all of the possible stereoisomers in Fischer projections below

predict the major product of the following reactions

Part C 1. LDA, THF 2. OPh 3. H,0 queneh Draurtt

Complete the reaction.

Part C 1. LDA, THF 2. OPh 3. H,0 queneh Draurtt

Draw the product of the E2 reaction shown below. Include the correct stereochemistry. Ignore any inorganic byproducts. H H3C Ph Ph CH3 Br NaNH2 Draw the E2 Product

A buffer prepared by dissolving oxalic acid dihydrate (H,co, 2H,0) and disodium oxalate (Na,C,0,) in 1.00 L of water has a pH of 5.110. How many grams of oxalic acid dihydrate (MW 126.07 gmol) and disodium oxalate (MW 133.99 gmol) were required to prepare this buffer if the total oxalate concentration is 0.188 M Oxalic acid has pk, values of

Instructions Answer the following questions regarding test for aldehydes and ketones. Use the space (boxes) provided to answer the activity. 1. Predict the product for the following reactions of aldehydes and ketones. a. H.NNH NO, CH CH,CH, NO butan2one 2, 4Dinitrophenyl hydrazine b. HN NH NO, NO 2, 4Dinitrophenyl hydrazine cyclohexanone . C0

1. Which compound has a higher boiling point a. (i) pentan1,5diol or (ii) hexan1ol b. (i) hexan2ol or (i) hexane1,5diol c. (i) hexan2ol or (ii) hexane1,5diol 2. Predict which member of each pair will be more soluble in water. a. (i) heptan1ol or (i) 4methylphenol b. (i) hexan2ol or (i) cyclooctane1,4diol c. (i) butan10ol, (ii) pentan1ol, or (ii)

If a compound had intercalated into DNA's base pairs, could this intercalation cause the d-orbital splitting energy of a compound to change? How?

a. Draw the product from the reaction between hydrogen sulfite and malvidin30glucoside. b. Explain how sufficiently low pH can induce release of the hydrogen sulfite from malvidin30glucoside.

Insulin (the ligand) binds to the insulin receptors (the protein) with a Kd of 0.1 nM. At what concentration of insulin will 70% of insulin receptor molecules be bound by insulin? Present your answer in Musing scientific notation. Show your calculations

Can red cabbage juice be used as a pH indicator? Create an if-then hypothesis. Then create your experiment.

You should now have a firm grasp on creating hypotheses. The question for your project is Can red cabbage juice be used as a pH indicator Create an ifthen hypothesis which can be used to help answer this question. Hint Focus on what makes something a pH indicator. Recall that your hypothesis should state what you are doing in the lab, and then

2. In an analysis of interhalogen reactivity, 0.500 mol of ICI was placed in a 5.00L flask, where it decomposed at a high T 2ICI(g) 12(8) Cl2(8). Calculate the equilibrium concentrations of l2, Cl2, and ICI (Kc 0.110 at this temperature).

3. Compare the solubility, in milligrams per milliliter, of silver iodide, Agl, (a) in pure water and (b) in water that is 0.020 M in AgNO3.

Which of the following acids has the lowest pH 0.1 , , 2.43 0.1 M HB, pK, 4.55 3D 0.1 M HCO, pK 8.23 3D 3 pure water HD O HAO O pure water

Carbohydrates (also known as sugars) are an important class of biological molecules. Their structures may seem very complicated, but you have the tools necessary to not only understand their structures but also communicate them in different ways. The following molecule is an example of a simple sugar. Use this molecule to a. Explain the concept of

Classify the following as a. aromatic b. antiaromatic c. nonaromatic d. not a.c. Answers are repeated. 8. 10. 11. 12.

Present reaction reagents to obtain the product from each reaction

1) Br benzene 2) CI 3) OH

What are the things to consider when considering installing a solar panel system in homes

Calculate the conditional formation of FeY - at pH 8.5 in the presence of 1M NaF (given that [F - ]= 1.0M at equilibrium).

3. Let (t) 3 sin t3 cos tj 9k be the velocity of a particle at time t. (a) (Section 14.3) Find the acceleration function (t). (b) (Section 14.3) Find the position function 7(t) if 7 (7) 1 31 7k. 4. A particle travels along the curve C given by 7 (t) 2 cost, t, 2 sint . (a) (Section 14.4) Determine how far the particle traveled along C for 0

Complete the reaction. (Formation of haloform)

CHCH2 CCH2 3BY23 OHP

The partial fraction decomposition of g(x) 4x 3 f(x) 2x 7 2 where f(x) 34x 53 8x2 34x 21 can be written in the form of syntax incomplete., and g(x)

Solve it (2x-7)2=81r