Chemistry Questions and Answers August 21, 2020

match each compound with the spectrum and explain the match.

Parent Transilence Parent Trancalance Parent Tranmillance B OCH, 4000 3500 3000 2500 2000 1800 1600 1400 1200 1000 800 600 4000 3500 3000 2500 2000 1800 1600 1400 1200 1000 800 600 4000 3500 3000 2500 2000 1800 1600 1400 1200 1000 800 600 4000 3500 3000 2500 2000 1800 1600 1400 1200 1000 800 600 Jou OH I ww G HO H 4000 3500 3000 2500 2000 1800

1. a. The car I drive is a Toyota Prius C its average mileage rating is 51.0 mpg. Convert this rating into units of kilometers traveled per liter of gasoline consumed. (3 pts) b. Gasoline is a mixture of several hydrocarbon compounds, but lets assume that it consists of only one nonane. If the density of nonane is 0.718 gmL, use the result from

A. Calculate the volume of 50 ww NaOH (density 1.515 gmL) required to prepare 0.5 L of 0.1 M NaOH. You should report this value to 2 digits. B. Calculate the mass of KHP needed to react with 29 mL of 0.1 M NaOH. Remember to show stoichiometry explicitly, with units. This is the amount needed for one standardization titration. You should report

Which structure(s) isare enantiomer(s) of structure A CH3 HOCH a) D only d) B and D only CH3 HCOH HCNH, A COOH HCNH B COOH b) e) CH3 HOCH HNCH B only None of them C COOH CH3 HCOH HNCH D COOH c) C only

What is the mass of 30.0 mL of an unknown solution with a density of 1.60 g/mL? A.18.8 B.48.0 C. 31.6 D.53.3

An airline mainly serves 2 groups of consumers, and their demand functions are as follows where P Q1 Q2 Q Group 1 Q1 20,000 5P Group 2 Q2 16,000 5P price of air ticket number of tickets sold to the Group 1 consumers number of tickets sold to the Group 2 consumers total number of air tickets The average variable cost per ticket is constant

Part A What is the value of the bond angles in CC14 Enter the bond angle of the molecule. degrees Submit Hints My Answers Give Up Review Part Part B What is the value of the smallest bond angle in C1F4 Enter the smallest bond angle of the molecule. Submit degrees Hints My Answers Give Up Review Part Part C What is the value of the bond angles in

On a rainy day, a barometer reads 745 mmHg. Convert this value to atmospheres. Express your answer numerically in atmospheres. VE Submit Hints My Answers Give Up Review Part VE Submit Part B A closed container is filled with oxygen. The pressure in the container is 205 kPa. What is the pressure in millimeters of mercury Express the pressure

The reaction between propionyl chloride and acetate ion is outlined below. a) Complete the mechanism of the forward reaction by placing curved arrows to show the electron movements in the reactants and intermediate product. b) Draw the structures of the final product and leaving group. including any charges. (Electrons may be omitted.) UT 1 S

Which resonance forms of silicon dioxide contribute the most to the actual bonding 0 A A contributes the most. B contributes the most. C contributes the most. B and C contribute equally. B A, B and C each contribute equally. It is impossible to say without more information. C 0.

Select the oxidizing or reducing agent(s) that you would use to carry out the transformation below. OH HC i. 03, CH3OH ii. (CH3)2S PCC Na, NH3 ORCO3H NaBH4 LOCH3 i. LiAlH4 ii. H3O H, Pd H, Lindlars Catalyst i. KMnO4, HO, KOH, heat ii. H3O HC OH CHOH,Select the oxidizing or reducing agent(s) that you would use to carry out the transformation below.

Arrange these ions according to ionic radius. CI S K Largest radius Smallest radius Answer Bank p Ca

Assuming the vant Hoff factors in the table below, calculate the mass of solute required to make each aqueous solution Table. Vant Hoff Factors at 0.05 m Concentration in Aqueous Solution Solute Nonelectrolyte NaCl MgSO4 MgCl2 KSO4 FeCl3 Expected 1 2 2 3 3 4 Measured 1 1.9 1.3 2.7 2.6 3.4 Part A Calculate the mass of solute required to make a

A stainless steel alloy is to be analyzed for its chromium content. A 4.70 g sample of the steel is used to produce 250.0 mL of a solution containing CrO7 A 10.0mL portion of this solution is added to BaCl(aq). When the pH of the solution is properly adjusted, 0.145 g BaCrO4 (s) precipitates.,What is the percent Cr, by mass, in the steel sample

V) A portion of the character table for D2h is shown below, but is missing the identification of the effects of symmetry operations on translation along the x, y, and zaxes in the point group D2h. Complete the character table by determining the irreducible representations that correspond to the translation along the x, y, and zaxes. Ethylene,

2. 3. Using the absorbance versus wavelength plot given in Figure I, determine the approximate value of Amax of the dye used to construct this plot. Then using this value of Amax and the color wheel, determine the color of this dye. Using the calibration plot and trend line equation given in Figure II, determine the concentration of a dye solution

On the weak basestrong acid titration curve below, label the following points. a) The point where the pH corresponds to a solution of the weak base (B) in water. b) The point where the pH corresponds to a solution of the conjugate acid (BH) in water. c) The point where pH pK (for BH). Hd 7 mL of titrant 10 D a b

How would you synthesize the following compounds from benzene using reagents from the table?

a b C d CH3CI AICI 3 CH3CI ClFeCl3 NaCN e Submit Answer g a) Phenylacetic acid, C6HCHCOH b) pMethylbenzoic acid (ptoluic acid) Reagents 1. NaOH HO 2. H3O NBS(PhCO2)2 Try Another Version 1. CO2 2. H3O KMnO4 H3O j I Cl k HNO3 HSO4 9 item attempts remaining Br FeBr3 Mg dry ether

Write a net ionic equation to show that nitric acid, HNO3, behaves as an acid in water. Submit Answer HO(1) Retry Entire Group 5 more group attempts remaining,Use the References to access important values if needed for this question. Acid Strength Increases BL acid Acid HS HCIO Conjugate base HS (1) Write a net ionic equation for the reaction

Which statement best summarizes the difference between ionic and molecular compounds (a) Molecular compounds contain highly directional covalent bonds, which results in the formation of moleculesdiscrete particles that do not covalently bond to each other. Ionic compounds contain nondirectional ionic bonds, which results (in the solid phase) in

The table to the right gives the concentrations of CH4O(g) as a function of time at a certain temperature for the following reaction CHO(g) CH(g) CO(g) Verify that this is a firstorder reaction by plotting InCH4O versus time and determining the value of the rate constant. Number min 1 C2H4O (M) time (min) 0.0860 0.0465 0.0355 0.0274 0.0174 0.00

Using the following data, Metal Tm (K) AHrus (kJmol) Tb (K) Hvap (kJmol) 454 2.99 1615 134.7 371 2.60 1156 89.6 K 336 2.33 1033 77.1 Rb 312 2.34 956 69 Cs 302 2.10 942 66 Li Na calculate AStus and ASvap for K. AS fus Number 0 J. K. mol AS ap Number J. K.mol

Using linear regression determine the absorbanceconcentration relationship for the dye. dye x A,Preliminary analysis Preparation of Blue1 dye standard solutions via dilutions and Beers Law analysis Molar concentration of the dye stock solution 2.52e5 molL Operating Wavelength 628 nm Solutions (Dilutions) 1 2 3 4 Absorbance (A) (a.u.) 0.086 0.189

1. 2. 3. Using a table of E values, place sodium, magnesium and silver in the appropriate places in your activity series. What is the highest cell voltage that could be constructed from the half cells used in this experiment Supposed that you had used FeFe as the reference reaction instead of the one that included the most active metal. How would

Production of formaldehyde (CHO) in a continuous reactor involves the catalytic oxidation of methanol (CHOH) CHOH 12O CHO HO The reaction is accompanied by a side reaction where some of the product reacts with oxygen to produce CO and HO CHO 12O CO HO The feed to the reactor contains methanol and 50 kmolhr of oxygen gas. Suppose the reactor

Write the balanced chemical equation for the reaction shown here. N CI HO 4 8 Play Do not subscript the arrow.

Write the chemical equation for the formation of HF from the single, isolated H and F atoms. HF 2HF Using the table of bond energies determine the AH for the above reaction. Think about the sign of the energy in this reaction. Number AH 569 kJmol Bond Dissociation Energies Bond HH HF HC HBr H1 Energy (kJmol) 436 569 410 366 298

Write the common names for the amines shown below. HCNCH, CH3 H hethylmethylamine HCCH,NCH,CH3 H ethylpropylamine Incorrect. First name the alkyl groups. Keep in mind that the term methyl indicates one carbon atom. Consider which prefix indicates two carbon atoms. List the alkyl groups in alphabetical order, followed by the term amine. Your answer

What mass (in grams) of calcium chloride (CaCl2) is needed to prepare 4.600 L of a 1.53 M solution?

A 318-mL sample of a solution having a concentration of 0.733M contains ___________ moles of solute. (report answer to 3 significant figures)

Select the products that result from the following reaction. CH,CHOH() NaH(s) NaOCH3 and CH3OH NaCHCH3 and HO NaOCHCH3 and H O NaOH and CH3CH3

Predict the major substitution products of the following reaction. Br H Na OAc HOAc Use the wedgehash bond tools to indicate stereochemistry where it exists. If there is more than one major product possible, draw all of them. Draw one structure per sketcher. Add additional sketchers using the dropdown menu in the bottom right corner. Separate

. Draw the expected product(s). Consider whether a racemic mixture is expected, and if so, make sure to draw both enantiomers.

Predict whether each of the following compounds is soluble in water.

Drag the items into the appropriate bins. Soluble in water Sn(OH) K3PO4 AgNO3 Agl SrBr Insoluble in water Reset Help

What is the product of the following elimination OMe What is the product of the following elimination Br OMe

Propose a mechanism for the following reaction CH3 OH CH3 CH CH3 HO H Draw all missing reactants andor products in the appropriate boxes by placing atoms on the canvas and connecting them with bonds. Add charges where needed. Electron flow arrows should start on an atom or a bond and should end on an atom, bond, or location where a new bond

Propose a mechanism for the following reaction. Fill in the missing curved arrows in each step. HO H H HO H3C Ot CH3 H HSO4 heat H3C CH3 HO (Scroll down),CH3 H OR CH3 H. Product H3O 0 H H3C CH3 click to edit HO,Determine the oxidation number of the highlighted atom in the following structure H H H C H H H3C H

Provide a structure for the following compound molecular mass 71 IR 3200 (strong, broad), 2250 cm no absorptions in the 15002250 cm range H NMR 8 2.62 (2H, t, J 6 Hz), 83.42 (1H, broad s eliminated by DO shake), 3.85 (2H, t, J 6 Hz).

It takes 38.65 mL of a 0.0895 M hydrochloric acid solution to reach the equivalence point in the reaction with 25.00 mL of barium hydroxide, 2HCl(aq) Ba(OH)(aq) 2HO(l) BaCl(aq) What is the molar concentration of the barium hydroxide solution

Use the molecular orbital diagram shown to determine which of the following is most stable. Atomic orbitals 2p ON O B C 25 24 B 2 C1 Molecular orbitals Gip It ip Otp TU P B, C, N Atomic orbitals 24 2p

Between these two compounds, NH or CH3COO, draw the Lewis structure of the stronger base. pKs of organic and inorganic acids. Acid Acid CH3 CH3 NH3 H 51 38 35 CH3CHOH 15.9 HO CH3NH3 HCO3 pK pK 9.24 7.04 CH,COH 4.75 C6H5COOH 4.19 1.74 NH HS 15.7 H3O 10.64 HSO4 6.37 HBr aste Explicitly draw all H atoms. Include all valence lone pairs in your

This question has multiple parts. Work all the parts to get the most points. For the reaction below Br a Predict the product(s). C 1. Mg 2. CO2 3. H3O P 1

Rank the following compounds from most to least reactive in an SN2 reaction. Br Br CH 3 Br II I Br III IV

Rank the radicals in order of decreasing stability. Most stable Least stable Answer Bank (CH3)CCHCH3 (CH3)CCHCH (CH3)2CHCHCH (CH3)2CHCHCH3

Determine the shape and bond angle of these oxynitrogen ions. Linear 180 Trigonal planar 120 Tetrahedral 109.5 NO NO NO Answer Bank NO Bent 120 Bent 109 Pyramidal 109

Use the data to determine the heat of vaporization of ammonia. (I tried doing this without graphing & finding the slope, but could not get the correct answer). Determine the normal boiling point of ammonia.

The vapor pressure of ammonia at several different temperatures is shown below. Temperature (K) Pressure (torr) 65.3 134.3 255.7 456.0 597.0 200 210 220 230 235

Use formal charge to choose the best Lewis structure for CH3SOCH3 H H a) HCSCH dd H H c) HCSCH H HH b) HCSCH 1 H H d) HCSCH H 1 H

Part A Use formal charge to identify the better Lewis structure betwwen the following H HCS Structure I H HSC Structure II To calculate the formal charge on each atom in structure I and structure II, find the number of valence electrons and subtract the number of nonbonding electrons and onehalf the number of bonding electrons. Match the words in

Use the pH lab to sort each item into the proper bin. 0.1 M HCI 0.1 M HCH302 0.1 M NaOH 0.1 M NH3 pH paper turns orange pH 1 pH 13 weak acid weak base strong acid pH paper turns blue strong base

Use the scoring system described below to calculate the alignment score for IPNIA AIGDV VAG P VKGIYAVGDVCGK Scoring system Each identity results in 10 points Each gap has a penalty of 25 points score Number What is the percent identity (also called percent identity match) Number 0

Sort the phrases below as describing a competitive inhibitor, uncompetitive inhibitor, or a pure noncompetitive inhibitor. Note that Km refers to apparent Km Note If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly. Competitive inhibitor structurally

A solution containing a mixture of metal cations was treated with dilute HCI and no precipitate formed. Next, HS was bubbled through the acidic solution. A precipitate formed and was filtered off. Then, the pH was raised to about 8 and HS was again bubbled through the solution. A precipitate again formed and was filtered off. Finally, the solution

Write an equation for the formation of FeO3(s) from its elements in their standard states. Express your answer as a chemical equation. Identify all of the phases in your answer. 4Fe(s)302(g)2FeO3(s) Submit Correct Part F Previous Answers Find AH for Fe2O3(s) from Appendix IIB in the textbook. Express your answer using one decimal place. AH IVE

Write net ionic equations for the formation of each of the precipitates observed. Express your answer as chemical equations separated by a comma. Identify all of the phases in your answer

A solution contains one or more of the following ions Ag, Sr, and Cu2. When you add sodium chloride to the solution, no precipitate forms. When you add sodium sulfate to the solution, a white precipitate forms. You filter off the precipitate and add sodium carbonate to the remaining solution, producing another precipitate.

Find the charge in coulomb on 1 gion of Charge on one ion of N

of to Mn 3 How much charge is required to reduce (a) 1 mole of Al to Al and (b)1 mole

How much electric charge is required to oxidise (a) 1 mole of HO to O and (b)1 mole of FeO to FeO3

Exactly 0.4 faraday electric charge is passed through three electrolytic cells in series, first containing AgNO3, second CuSO4 and third FeC13 solution. How many gram of rach metal will be deposited assuming only cathodic reaction in each cell

An electric current of 100 ampere is passed through a molten liquid of sodium chloride for 5 hours. Calculate the volume of chlorine gas liberated at the electrode at NTP.

A 100 watt, 100 volt incandescent lamp is connected in series with an electrolytic cell containing cadmium sulphate solution. What mass of cadmium will be deposited by the current flowing for 10 hours

In an electrolysis experiment, a current was passed for 5 hours through two cells connected in series. The first cell contains a solution gold salt and the second cell contains copper sulphate solution. 9.85 g of gold was deposited in the first cell. If the oxidation number of gold is 3, find the amount of copper deposited on the cathode in the

How long has a current of 3 ampere to be applied through a solution of silver nitrate to coat a metal surface of 80 cm2 with 0.005 cm thick layer Density of silver is 10.5 gcm.

What current strength in ampere will be required to liberate 10 g of chlorine from sodium chloride solution in one hour

0.2964 g of copper was deposited on passage of a current of 0.5 ampere for 30 minutes through a solution of copper sulphate. Calculate the atomic mass of copper. (1 faraday 96500 coulomb)

19 g of molten SnCl is electrolysed for some time using inert electrodes until 0.119 g of Sn is deposited at the cathode. No substance is lost during electrolysis. Find the ratio of the masses of SnCh SnCI4 after electrolysis.

A current of 2.68 ampere is passed for one hour through an aqueous solution of copper sulphate using copper electrodes. Calculate the change in mass of cathode and that of the anode. (At. mass of copper 63.5).

An ammeter and a copper voltameter are connected in series through which a constant current flows. The ammeter shows 0.52 ampere. If 0.635 g of copper is deposited in one hour, what is the percentage error of the ammeter (At. mass of copper 63.5)

A current of 3.7 ampere is passed for 6 hours between platinum electrodes in 0.5 litre of a 2 M solution of Ni(NO3)2. What will be the molarity of the solution at the end of electrolysis What will be the molarity of solution if nickel electrodes are used (1 F 96500 coulomb Ni 58.7)

An acidic solution of Cu salt containing 0.4 g of Cu is electrolysed until all the copper is deposited. The electrolysis is continued for seven more minutes with volume of solution kept at 100 mL and the current at 1.2 amp. Calculate the gases evolved at NTP during the entire electrolysis.

Calculate the electricity that would be required to reduce 12.3 g of nitrobenzene to aniline, if the current efficiency for the process is 50 per cent. If the potential drop across the cell is 3.0 volt, how much energy will be consumed

An aqueous solution of sodium chloride on electrolysis gives H(g), Cl(g) and NaOH according to the reaction 2Cl(aq) 2HO 2OH(aq) H(g) Cl(g) A direct current of 25 ampere with a current efficiency 62 is passed through 20 L of NaCl solution (20 by mass). Write down the reactions taking place at the anode and cathode. How long will it take to

Chromium metal can be plated out from an acidic solution containing CrO3 according to the following reaction CrO3 6H 6e Cr 3HO

After electrolysis of a sodium chloride solution with inert electrodes for a certain period of time, 600 mL of the solution was left which was found to be 1 N in NaOH. During the same period 31.75 g of copper was deposited in the copper voltameter in series with the electrolytic cell. Calculate the percentage theoretical yield of NaOH obtained.

HSO4 as Peroxy disulphuric acid (HSO3) can be prepared by electrolytic oxidation of 2HSO4 HSO8 2H 2e Oxygen and hydrogen are by products. In such an electrolysis 9.72 litre of Hand 2.35 litre of O were generated at NTP. What is the mass of peroxy disulphuric acid formed

Cadmium amalgam is prepared by electrolysis of a solution of CdCl using a mercury cathode. Find how long a current of 5 ampere should be passed in order to prepare 12 CdHg amalgam on a cathode of 2 g mercury. At mass of Cd 112.40.

Assume that impure copper contains irons, gold and silver as impurities. After passing a current of 140 ampere for 482. Second, the mass of anode decreased by 22.260 g and the cathode increased in mass by 22.011 g. Estimate the percentage of iron and copper originally present.

1.0 N solution of a salt surrounding two platinum electrodes 2.1 cm apart and 4.2 sq.cm in area was found to offer a resistance of 50 ohm. Calculate the equivalent conductivity of the solution.

Specific conductance of a decinormal solution of KCI is 0.0112 ohm cm. The resistance of a cell containing the solution was found to be 56. What is the cell constant

The specific conductivity of 0.02 M KCl solution at 25C is 2.768 x 10 ohm cm. The resistance of this solution at 25C when measured with a particular cell was 250.2 ohms. The resistance of 0.01 M CuSO4 solution at 25C measured with the same cell was 8331 ohms. Calculate the molar conductivity of the copper sulphate solution.

The equivalent conductances of sodium chloride, hydrochloric acid and sodium acetate at infinite dilution are 126.45, 426.16 and 91.0 ohm cm equiv, respectively, at 25C. Calculate the equivalent conductance of acetic acid at infinite dilution.

The equivalent conductivity of N10 solution of acetic acid at 25C is 14.3 ohm cm equiv. Calculate the degree of dissociation of CH3COOH if is 390.71.

A decinormal solution of NaCI has specific conductivity equal to 0.0092. If ionic conductances of Na and CI ions at the same temperature are 43.0 and 65.0 ohm1 respectively, calculate the degree of dissociation of NaCl solution.

How can you increase the reduction potential of an electrode for the reaction M (aq) ne M (s)

Calculate emf of the following cell at 298 K Mg(s) 2Ag (0.0001M) Mg (0.130 M) 2Ag (s) Given Ecell 3.17 VI

Suggest a way to determine the A value of water. m

Predict the product of electrolysis of an aqueous solution of CuCl, with an inert electrode.

The conductivity of 0.02M solution of NaCl is 2.6 x 102 S cm. What is its molar conductivity

The K for AgCl at 298 K is 1.0 x 10. Calculate the electrode potential for AgAg electrode immersed in 1.0M KCl solution. Given AgAg 0.80 V.

Calculate the standard cell potentials of galvanic cells in which the following reaction take place 2Cr (s) 3Cd (aq) 2Cr (aq) 3Cd (s) Also calculate AG and equilibrium constant of the reaction.

Calculate the potential of the cell at 298 K CdCd (0.1M) H (0.2M)Pt, H, (0.5 atm) Given E for CdCd 0.403 V, R 8.314 J mol, F 96500 C mol.

The electrical resistance of a column of 0.05M NaOH solution of diameter 1 cm and length 50 cm is 5.55 10 ohm. Calculate its resistivity, conductivity and molar conductivity.

Three electrolytic cells A, B, C containing solution of ZnSO, AgNO, and CuSO, respectively all connected in series. A steady current of 1.5 amperes was passed through then until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow What mass of copper and of zinc were deposited

(a) Define weak and strong electrolytes. (b) The E values corresponding to the following two reduction electrode processes are (i) CutCu 0.52 V (ii) CuCut 0.16 V Formulate the galvanic cell for their combination. Calculate the cell potential and AG for the cell reaction.

Switch Sn Voltmeter Salt Bridge Wire Metal X 1.0 M Sn(NO) 1.0 M X(NO), An electrochemical cell is constructed with an open switch, as shown in the diagram above. A strip of Sn and a strip of unknown metal, X are used as electrodes. When the switch is closed, the mass of the Sn electrode increases. The halfreactions are shown below. Sn (aq) 2e

Cu (aq) 2 e Cu(s) Power Supply An external directcurrent power supply is connected to two platinum electrodes immersed in a beaker containing 1.0 M CuSO4(aq) at 25C, as shown in the diagram above. As the cell operates, copper metal is deposited onto one electrode and O2(g) is produced at the other electrode. The two reduction halfreactions for

2 H(g) O2(g) 2 HO(1) In a hydrogenoxygen fuel cell, energy is produced by the overall reaction represented above. (a) When the fuel cell operates at 25C and 1.00 atm for 78.0 minutes, 0.0746 mol of O2(g) is consumed. Calculate the volume of H(g) consumed during the same time period. Express your answer in liters measured at 25C and 1.00 atm. (b)

(a) Use the binomial theorem to expand (83x), x , in ascending powers of x, up to and including the term in x, giving each term as a simplified fraction. (b) Use your expansion, with a suitable value of x, to obtain an approximation to (7.7). Give your answer to 7 decimal places.

f(x) 27x 32x16 (3x2)(1x) f(x) Given that f(x) can be expressed in the form A B C (3x2) (3x2) (1x) x

(a) Find the binomial expansion of (18x), 1x in ascending powers of x up to and including the term in x, simplifying each term. (b) Show that, when x 1 100 (c) Substitute x the exact value of (18x) is 23 1 100 approximation to 23. Give your answer to 5 decimal places. into the binomial expansion in part (a) and hence obtain an

(a) Expand 1 (25r) Given that the binomial expansion of in ascending powers of x, up to and including the term in x, giving each term as a simplified fraction. 1 2 (b) find the value of the constant k, x (c) find the value of the constant A. 2 kx (25x) 25 Ax is