Chemistry Questions and Answers April 20, 2020

1. Consider the 18rule as a guide and determine the value of n in the following complexes i Naz Fe(CO)a ii MnBr(CO)a iii W(nCH6) (CO). iv Rh(n5C3H5) (CO), v Cr(nCsHs) (CO). (CH)

1. Consider the 18rule as a guide and determine the value of n in the following complexes i Naz Fe(CO). ii MnBr(CO)a iii W(nC.H6) (C). iv Rh(n5C3H3) (CO), v Cr(nCSH5) (CO)n (CH3)

name of an aplication in which polymer composite can not be use? and reason why we should not use that composite material in that aplication?

The correct onder of the lattice energies of the following inme compounds i 1) NaCI MgBr, CaO ALO, 3) MEBI, ALO, Cao 2) ALO, MgBr, Ca0 NaC 4) ALO, Cao MyBr, NaCI In which of the folowing the hvdration enery highet itan the latiicr energ NaCI 2. 1) MgSO, 2) RaSO, 3) SrSO, 4) BASO, A molecule which cannot exist theoreticilly is 1) SF 2) OF,

CHEMICAL BONDING 13. Which has a giant covalent structure 1) PhO, 4) AICI, 3) NaCi 2) Sio, 14. 0, is 1oclectronic with 1) H, 4) S 3) F 2) N. Numerical Value Type Questions 15. The total number of electrons that take part in forming bonds in a CH, molecule ate 16. No. of unit cells are present in a cubeshped ideal crystal of NaCl of mass lg is xx

OBJECTIVE CHEMISTRY JA The loal number of Na ions present per unit cell of Nac is CHEMICAL BONDING a) 1 b) 6 The mumber of ion pairs that constitute one mit cel of CC c) 8 d) 4 a) 4 b) 2 e) 8 d) 1 Which of the following is not involved im BomHaber cyele a) Sublimation energy el Lattice energy b) lonisation potential d) Electonegativity 11 What is

The oscillation of the atoms around their equilibrium positions in the molecule HI can be modelled as a harmonic oscillator of mass mmH (the iodine atom almost stationary) and force constant k3138 Nm1 Evaluate the separation of the energy levels and predict the wavelength of the light needed to induce a transition between the neighbouring levels.

S) NO 4. Based on VSEPR theory, the number of 90 FBrF angles in BrF5 1s Integer Type Questions 5. What are the total number of hybrid orbitals present on Xe in XeF, 5. Total number of covalent bonds between carbon and carbon atoms in C,0, molecule is . The number of covalent bonds in XeO, molecule is In SF, S atom has dsp hybridisation. What is

B. Name the molecule whose line structure is given below. Also draw the condensed structure (CH2 and CH3 parts are ok) for the molecule made by the reaction of acetic acid molecules with one of the molecules drawn below, and name the product. Name of molecule to right Synthesis product drawing and name

B. Name the molecule whose line structure is given below. Also draw the condensed structure (CH2 and CH3 parts are ok) for the molecule made by the reaction of acetic acid molecules with one of the molecules drawn below, and name the product. Name of molecule to right Synthesis product drawing and name

B. Name the molecule whose line structure is given below. Also draw the condensed structure (CH2 and CH3 parts are ok) for the molecule made by the reaction of acetic acid molecules with one of the molecules drawn below, and name the product. Name of molecule to right Synthesis product drawing and name

N Styles Voice Editor 2. What is the amount of liquid being measured in the P20 micropipettor below

N Styles Voice Editor 2. What is the amount of liquid being measured in the P20 micropipettor below

H H 3. HCC0H kCH H H 3 Figone 16 In figure 1.6, which compound will have the highest boiling point and highest vapor pressure respectively O 2 and 4 O 1 and 2 O 4 and 2 O 3 and 4

H H 3. HCC0H kCH H H 3 Figone 16 In figure 1.6, which compound will have the highest boiling point and highest vapor pressure respectively O 2 and 4 O 1 and 2 O 4 and 2 O 3 and 4

You need to prepare an acetate buffer of pH 5.30 from a 0.712 M acetic acid solution and a 2.18 M KOH solution. If you have 930 mL. of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.30 The pK, of acetic acid is 4.76. mL

7.) 0.501 kmday Ls O DD OD

Write the complete and detailed mechanism for THREE EXAMPLES of SN1 reactions. In each example , clearly name and identify the MOLECULES and PRODUCTS at each stage and use curved arrows to show electron movement at each stage of the reaction.

Gaseous fuel composed of 65% carbon, 30% hydrogen and 5% oxygen saturated with water vapor is burned with 20% excess air. Air is supplied at 70F, saturated with water vapor. Incomplete combustion has taken place on the burner and that analysis shows that the ratio of CO2 to CO in the stack gas is 3:1. Calculate: a) the complete analysis of the wet

(12) Gaseous fuel composed of 65% carbon, 30% hydrogen and 5% oxygen saturated with water vapor is burned with 20% excess air. Air is supplied at 70F, saturated with water vapor. Incomplete combustion has taken place on the burner and that analysis shows that the ratio of CO2 to CO in the stack gas is 3:1. Calculate: a) the complete analysis of

Find two vectors parallel to v of the given length. (16, 12, 0) length 25 ,The vector in the direction of v is D. The vector in the opposite direction of v is

31. Which combination of the compounds and their geometry are correct h) CIF, Vshaped e) CIF, Tshaped OB. a HeCl, linoar 24. Which of the following havea bond angle smaller than tetrahodral hond b) Sil, e) NH, d) 1,0 25 In which of the fellowing molecules, vacant orbitals take part in hybridization al BH, HN ( h) AL,C, e) H,PO, 20. Which of the

2. Arrange A, B, C, D points (form the shown wood resistograph) in ascending order of their strength resistance. (5points) 500 400 B 300 200 100 D 0. 10 20 30 40 50 Drilina lenath Imml 60 70 80 90 100 Drilling resistance

A change in the right hand side of a binding constraint may change all of the following except O a. objective function value O b. other right hand sides O c. optimal value of the decision variables O d. slack values

After purifying tyrosinase, you wish to know how much total protein you have purified You use a Bradford protein assay to determine your protein concentration. Your sample containing tyrosinase has an absorbance reading of 0.655. You use BSA as your standard and receive the following data BSA amount (ug) Absorbance at 595nm 0.5 0.205 1.0 0.410 2.0

How many milliliters of 0.2 M Mg(OH) 2 (aq) are required to titrate 25 ml 0.3 M HC 3 H 5 O 2 (aq)?\\

Why did Kant think it necessary to posit the existence of the nominal world?

The following liquidphase reactions were carried out in a CSTR at 325 K. 3A BC rIA KIACA kIA 6.0 minls dm mol2 min 2CA 3D k2p 4.0 dm3 dm3 4D3C 3E r3E k3E CpCc k3E 5.0 mol min The concentrations measured inside the reactor were CA 0.10, C 0.93, Cc 0.51, and Cp (a) What are rIA, 2A and r3A (b) What are riB, 2B, and r3g (c) What are ric, 2C,

Consider the following model of the hydrogen atom. A small point change of+q is surrounded by a uniform spherical distribution of negative charge with constant charge density and radius r0. (a) Using the fact that the hydrogen atom is neutral, find 0 in terms of q and r0. (b) Find the potential at any distance r from the center.

(112)What is the empirical formula of a compound whose percentage composition is found to be 2.20% hydrogen 26.7% carbon and 71.1% oxygen?

a) Identify two possible molecular formulas of compounds with molecular weight under 100 from combustion analysis: C 91.11.% H 8.90% b) Identify the possible molecular formula of a compound with molecular weight under 250 from combustion analysis: C 54.01% H 4.01% Cl 29.11%

PART C Problems (20 marks) Answer all questions in the space provided. Show complete solutions for full marks. All answers must be expressed using correct significant digits. 1. What is the empirical formula of a compound whose percentage composition is found to be 2.20 hydrogen, 26.7 carbon, and 71.1 oxygen (4 marks) 2. Sodium hydroxide and

Daphne complains to you, "BC has the highest taxes in the world." You laugh. "Why are you laughing? I work 40 hours a week and I'm supposed to be getting paid $21 per hour. Every two weeks, I get a cheque for $1,313.26! It seems so low!" You reply, "Well maybe you can find a better job?" Daphne frowns. "Well, I did have the option of taking this

Assume the following process is steadystate. 4,500 kgh of a solution that is 13 K2Cro, by mass is joined by a recycle stream containing 36.4 K2CrO4, and the combined stream is fed into an evaporator. The concentrated stream leaving the evaporator contains 49.4 K2CrOa and is in turn fed into a crystallizer in which it is cooled to form crystals of

What maximum mass of carbon dioxide is produced by the complete combustion of 15.0 kg of this fuel mixture?

a) HgS is known to have a Kps =4.0x10^-14. Obtain the maximum amount of solute that can be added to 1L of solvent. Explain each step. b) It is known that BaCO3 has a Kps =8.1x10^-9. Obtain the maximum amount of solute that can be added to 1L of solvent. Explain each step. c)Al(OH)3 is known to have a Kps =1.8x10^-33. Obtain the maximum amount of

Which of the following are macroeconomists most interested in encouraging in order to increase the standard of living. inflations/trade-offs/ideas.

2. Provide the hybridization, electronic geometry (shape, ex. Tetrahedral), and bond angle for each of the indicated atoms in the molecule below. C2 C1 HCCEN H. Atom Hybridization Shape Bond Angle C1 C2 HCI

Calculate the pH of the cathode compartment for the following reaction given cell = 3.01 V when [Cr3+] = 0.15 M, [Al3+] = 0.34 M, and [Cr2O72] = 0.59 M. 2 Al(s) + Cr2O72(aq) + 14 H +(aq) 2 Al3+(aq) + 2 Cr3+(aq) + 7 H2O(l).

5. Provide all of the possible products for the substitution reactions below. When applicable, indicate the kinetic and the thermodynamic product of the reaction. Dont worry about stereochemistry. H20 HCI a. . Br NaOMe EEOH b. CI d.

5. Provide all of the possible products for the substitution reactions below. When applicable, indicate the kinetic and the thermodynamic product of the reaction. Dont worry about stereochemistry. H20 HCI a. . Br NaOMe EEOH b. CI d.

Sum of o and n bonds in carbon sub oxide (C302) i . Backspace 7 8 9 4 5 6 1 2 3 Clear All

Find the number of cations for which L.P of cations is lower than corresponding atom K,0, Net, Het, Bet, Nat,. Backspace 7 8 9 4 5 6 1 2 3

4G l 1005 Vo) LT 77 epraghna.comstudent, 3 Lattice energy is the energy released, when one mole of ionic solid is formed from its constituent gaseous cations and anions. Hydration energy is the amount of energy released when one mole gaseous cation or one mole of gaseous anion is completely hydrated Consider the following conversion and calculate

Find pH of a solution obtained by mixing 100 ml each of 0.1 MH3 A and 0.1M Naz Agiven phon, phg and phing of H3A are 4,7, 10 Backspace 7 8 9 4 5 6 1 2 3

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar (A) Ca S Ba Se Ar (B) S Se Ca Ba Ar (C) Ba Ca Se S Ar (D) Ca Ba

The correct option with respect to the Pauling electro negativity values of the elements is (A) PS (B) Si Al (C) Te Se (D) Ga Ge

The element having greatest difference between its first and second ionization energy is (A) Ca (B) Se (C) Ba (D) K

K S K K 2 d Ca Ca Ca2 In a, b, c, d are I.P then which of the following order is not correct (A) ca (B) ba (C) dc (D) b d

Lowest anion to cation ratio is in (A) LIF (B) NaF (C) Csl (D) CsF

Incorrect match of general electronic configuration (A) (n 2) fl14 (n 1) d1ns fblock elements (B) (n 1) s pnsl2 s block elements (C) ns2np5 Representative elements (D) (n 2) f14 (n 1) d10 n block elements

Which of the following order is incorrect against property indicated (A) N2O5 NO2 N2O3 N (acidic nature) (B) Lit Nat K Rb (h energy) (C) 02 F F (size) (D) Si Al Mg Na (ionization energy)

Which of the following is not discrete molecule (A) SiC() (B) CO29) (C) N2(9) (D) SO3(9)

Select the Correct order of lattice energy (A) Beo Mgo (B) MgS Mgo (C) Mg3 N2 Mg0 (D) BeF, BeO

Select the correct order according to given property (A) Li Na Reducing nature in water (B) Na Li lonic mobility in water (C) Na) Lio) Size (D) Na Li Radius (ag) (aq)

Which of the following is most soluble in water (A) MnS (Kp 8 x 10 37) (B) ZnS (Kp 7 x 1016) (C) Biz S3 (Kap 1 x 1072) (D) Ags (PO4) (K 1.8 x 10

pka value of CH3COOH is 4.78. Which of the following statement is correct (A) pH of 0.1 M CHCOOH is 4.78 (B) pH 4.78 then degree of dissociation of CH3COOH is maximum (C) pH 4.78 then degree of dissociation of CH3COOH is minimum (D) pH 4.78 then 50 CH3 COOH is dissociation

Calculate the ratio of pH of a solution containing 1 mole of CH3COONA 1 mole of HCl per litre and of the other solution containing 1 mole of CH3 COON 1 mole CH3COOH per litre (A) 16 (B) 14 (C) 18 (D) 12

For the reaction Ag(CN), Ag 2CN, the equilibrium constant at 25Cis 4 x 1019. If a solution is 0.1 M in KCN and 0.03 M in AGNO3 originally, at equilibrium, the conc. of Ag is (A) 7.5 x 1016 M (B) 7.5 x 10 18 M (C) 1.25 x 1019 M (D) 1.25 x 1017 M

Which of the following is correct decreasing order of solubility of AgCl 1) In water II) 0.1M NacI III) 0.1M BaCl, V) 0.1M NH3 (A) II I IV (B) IV I III (C) I IV II II (D) I III IV

What is the HCOO in the solution that contains 0.015 M HCOOH and 0.02 I. 1.8 104 (A) 1.8 x 104 (B) 1.35 x 104 (C) 1.8 x 102 (D) 8 x 103

1. Draw all of the stereoisomers of 2,4dichloropentane. indicate the relationship between these stereoisomers, such as enantiomers, diastereomers. or meso compounds. 2. Give the IUPAC names of the following compounds CH2CH3 H ii. i. F Br ii. 3. Draw the structures of the organic product(s) of the following reactions H20 ii. 0 SH SH H iii. HO H

What makes sulphonation different from oxidation and reduction reactions?

(567)What makes sulphonation different from oxidation and reduction reactions?

Define temperature inversion as it applies to photochemical smog

Define temperature inversion as it applies to photochemical smog?

Of the four aldopentoses, two forms diacetyl\'s readily when treated with excess acidic acetone, but the other two form only monoacetals. Explain

Based on the mechanism presented for the Pd-catalyzed reaction of a halobenzene with hydroxide ion, write out a reasonable mechanism for the Pd-catalyzed reaction of 1-Bromo-3-methoxybenzene with 2-methyl-1-propanamide. Please give me fast answer and detail solution

Based on the mechanism presented for the Pd-catalyzed reaction of a halobenzene with hydroxide ion, write out a reasonable mechanism for the Pd-catalyzed reaction of 1-bromo-3-methoxybenzene with 2-methyl-1-propanamine. Solve the problem detail

A solution is made by mixing 30.0 mL30.0 mL of ethanol, C2H60,C2H6O, and 70.0 mL70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 C20 C The relevant values at 20 C20 C are included in the table. Density (gmL) Vapor Pressure, PP. Liquid (Torr) ethanol0.789 43.9 water 0.998 17.5

A solution is made by mixing 30.0 mL30.0 mL of ethanol, C2H60,C2H6O, and 70.0 mL70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 C20 C The relevant values at 20 C20 C are included in the table. Density (gmL) Vapor Pressure, PP. Liquid (Torr) ethanol0.789 43.9 water 0.998 17.5

A solution is made by mixing 30.0 mL30.0 mL of ethanol, C2H60,C2H60, and 70.0 mL70.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 C20 C The relevant values at 20 C20 C are included in the table. Density (gmL) Vapor Pressure, PP. Liquid (Torr) ethanol0.789 43.9 water 0.998 17.5

Predict the T values for nonane CH3(CH2)7CH3 and for 1-pentanol CH3(CH2)4OH and explain how you made the prediction.

AM Gold Scat 1. 2 3 10 11 Coupound Pentane Heptane Octane Methanal Ethanol 1propanol Water Pentane Absant Trial 1 Delta T (C) 28.3 17.3 11.7 5.2 19.2 10 5.1 26.8 Trial 1 Time to Dalta T (s) 159 109 351 188 105.5 159 148 216 47 Trial 1 Time to drop 1 C (s) 4 3 18 22 12 27 2.5 Trial 2 Delta T(C) 27.1 9.7 4.3 18.5 11.4 6 6.4 204 Trial 2 Time to

Which of the following is the major organic product of the reaction below OTs OH excess NaN, Na Na OH D.

Which of the following is the major organic product of the reaction below OTs OH excess NaN, Na Na OH D.

Calculate the mass, in grams, of CuCl, (MW 134.452 gmol) required to prepare 100.0 mL of a 2.02 wv Cu (MW 63.546 gmol) solution. 3D mass of CuCl,

Calculate the mass, in grams, of CUCI, (MW 134.452 gmol) required to prepare 100.0 mL of a 2.02 wv Cu (MW 63.546 gmol) solution. 3D mass of CuCl,

The following chemical reaction takes place in aqueous solution AGNO (aq) KCI(aq) AgCl(s)KNO,(aq) Write the net ionic equation for this reaction.

The following chemical reaction takes place in aqueous solution AGNO (aq) KCI(aq) AgCl(s)KNO,(aq) Write the net ionic equation for this reaction.

Exercise 5.2 A gas mixture of 02 and Kr has a mass density of 1.114 g / L at 385 torr and 400 K. Calculate the mol% of oxygen gas in the mixture.

Integer Type Questions . Dipole moment of certain diatomic molecule X Y is 0.38 D. If the X Y distance is 158 pm, the percentage of electronic charge developed on Xatom is 10 Dipole moment of Toulene and chlorobenzene are of 0.4 D and 2.6D. The dipole moment of pchloro toluene in debye units is 31. How many lone pairs are there at xenon in XeOF,

Integer Type Questions 9. Dipole moment of certain diatomic molecule X Y is 0.38 D. If the X Y distance is 158 pm, the percentage of electronic charge developed on Xatom is 30 Dipole moment of Toulene and chlorobenzene are of 0.4 D and 2.6D. The dipole moment of pchloro toluene in debye units is 31. How many lone pairs are there at xenon in

Integer Type Questions . Dipole moment of certain diatomic molecule X Y is 0.38 D. If the X Y distance is 158 pm, the percentage of electronic charge developed on Xatom is 10 Dipole moment of Toulene and chlorobenzene are of 0.4 D and 2.6D. The dipole moment of pchloro toluene in debye units is 31. How many lone pairs are there at xenon in XeOF,

8. Dative bond is present in 4) BF3 3) Cl, 1) O, 2) NH3 Which of the following does not contain coordinate bond 2) NH, 9. 4) H,O 3) SO3 1) BH, 25 10. Which have zero dipole moment 2) Cis1,2dichloroethane 1) 1,1Dichloroethene 4) 1,2Dichlorobenzene 3) Trans1,2 dichloroethene 11. Select the correct relation 4) cant compared 2) UNH, HNF, 3) NH,

8. Dative bond is present in 4) BF3 3) Cl, 1) O, 2) NH3 Which of the following does not contain coordinate bond 2) NH, 9. 4) H,O 3) SO3 1) BH, 25 10. Which have zero dipole moment 2) Cis1,2dichloroethane 1) 1,1Dichloroethene 4) 1,2Dichlorobenzene 3) Trans1,2 dichloroethene 11. Select the correct relation 4) cant compared 2) UNH, HNF, 3) NH,

8. Dative bond is present in 4) BF3 3) Cl, 1) O, 2) NH3 Which of the following does not contain coordinate bond 2) NH, 9. 4) H,O 3) SO3 1) BH, 25 10. Which have zero dipole moment 2) Cis1,2dichloroethane 1) 1,1Dichloroethene 4) 1,2Dichlorobenzene 3) Trans1,2 dichloroethene 11. Select the correct relation 4) cant compared 2) UNH, HNF, 3) NH,

8. Dative bond is present in 4) BF3 3) Cl, 1) O, 2) NH3 Which of the following does not contain coordinate bond 2) NH, 9. 4) H,O 3) SO3 1) BH, 25 10. Which have zero dipole moment 2) Cis1,2dichloroethane 1) 1,1Dichloroethene 4) 1,2Dichlorobenzene 3) Trans1,2 dichloroethene 11. Select the correct relation 4) cant compared 2) UNH, HNF, 3) NH,

Which one of the following pairs is paraagnetic 2) P,0,. N,0, 3) CIO, NO, 4) So, NO 1) CLO, SO, 2. co. NO BO The correct increasing order of extent of pbonding in above molecules are 4) II II 1 I)I