Chemistry Questions and Answers June 08, 2020

In one particular hemoglobin variant the Tyr 145 B is replaced by a Cys which causes formation of an unusual disulfide in this subunit. This prevents the formation of ion pairs that stabilize the T state of hemoglobin. Which of the following would be true as compared to normal hemoglobin (Choose all correct answers). U 1) The oxygen affinity would

25mL of saturated KHC4H4O6 was prepared and titrated with 6.91mL of 0.0250M NaOH. a. What is the Ksp and molar solubility of KHC4H4O6? b. If KHC4H4O6 is dissolved in 25mL of 0.1M KCl, how much 0.0250 M NaOH will be used?

A raindrop is formed in a cloud and comes to equilibrium with Poco2 104.5 bar. The water droplet then passes over a smoke stakes and absorbs 103 M H2SO4. (Note that for H2CO3 , pKa1 6.35, pka2 10.33, Hco2 28.8 bar.L.mol1) a. Draw a log CpH diagram for the system and find the pH and alkalinity. (Show the species, reactions, mass action laws, mass

Show how you would carry out the following syntheses. You must begin with the indicated chemical(s) and you may use any necessary inorganic or organic reagents. All your reactions must produce the desired products in good yields and in a reasonably pure state.

a) cOCH3 from CH3 CNH2 O cOCH,CH3 b) from c) CH,CO2H from OCH3 d) CNH2 from CHCH2

The incorrect regarding the following structure is NH2 OH HOP N. OH Select one O a Analogue of deoxycytidine 5monophosphate Ob Denved from isoster replacememnt with deoxycytidine 5monophosphate Oc Antiviral drug Od Require thymidine kinase to become activated

5. What is the product of the polymerizations below in the Scheme What is the role of iodonium salt and Michlers ketone Explain. CH2 PF hv lodonium salt lodonium salt CH2 hv A. O. A Michlers ketone

Glucose is by far the most abundant sugar in nature. It can form sixmembered ring structures with chair conformations. The chair conformations of a andB Dglucose are shown below. OH OH HO HO HO HO OH H. OH O. H. aD G lucopyrano se BDG lucopyranese Using what you know about the conformational energy of substituted cyclohexanes, post your response

How to seperate sodium nitrate from its aqueous solution?

How to seperate sodium nitrate from its aqueous solution?

You have 70% Dextrose solution and water. The order you receive is for 500ml of 35% Dextrose solution. How much of each do you use ?

Identify all the peaks in this NMR.?

noltapermanganate3 20201019 O ppm 5 ppm 10 ppm

the area of a reservoir rock is 2000 ft. Its thickness 60 ft, porosity 0.22, calculate the volume of oil in bbl, the volume gas in ft3 , and volume of water in bbl , if So 65 , Sg 10. Also calculate the oil and gas in place knowing that Bo 1.34 bblSTB, Bg 3D 0.000665 ft3SCF . 1 bbl 5.615 ft

Find the net absorbance for each test tube number using a K value of 1.279 x 10^-4

Test tube number Absorbance Net absorbance 0,050 1 0.305 0.495 2 3 4 6.717 0. 913

identify the chiral carbons of the compound with an asterisk. CI

Which of the following pairs of elements is predicted to form an ionic bond, based on electronegativities? Be and N Be and F H and Cl H and Br All of these will form an ionic bond

3. Name the following compounds according to IUPAC rules a) H HCH H HCCC H H H b) H HCH HCCC CH c) H HCH 3D HCCCC H d) CHCH2 H2C CHCI CH2CH, HICIH IUI

4. Write the structural formulas of the following a) 3ethyl2,4dimethylpentane b) 2,2,3trimethylbutane c) 4ethyl2,3dimethylhexane d) 2,4,4trimethyl2pentene e) 4bromo3methyl1pentyne f) 2,3dimethyl1,3butadiene g) 1,3cyclopentadiene

4. Write the structural formulas of the following a) 3ethyl2,4dimethylpentane b) 2,2,3trimethylbutane c) 4ethyl2,3dimethylhexane d) 2,4,4trimethyl2pentene e) 4bromo3methyl1pentyne f) 2,3dimethyl1,3butadiene g) 1,3cyclopentadiene

You have a grossly icteric sample with an outofrange LDH (liver enzyme). The linear range of LDH is 500. The last time the patient was run, his LDH was 2025. What dilution would you start with

For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 5.00L container. A(g)2B(g) C(g) At equilibrium, the concentration of A is 0.273 molL. What is the concentration of B at equilibrium Write your answer with 3 decimals.

4. lodine 131 is a radioactive isotope with a half life of 8 days. A cloud of vapour containing this isotope escapes from a factory and a three mile radius from the factory is deemed unsafe to enter until the radiation count is 125 counts per second or below. If the initial count is 128,000 counts per second, how many days will it take before it

Given the following table of standard reduction potentials for a hypothetical element X under acidic solution Cell Notation E (V) XO3XO2 XO2HXO2 XOXO HXO2XO 0.77 1.05 A 0.98 XoX20 X20X2 1.45 1.61 X2XHa XOX0 0.25 C. Construct a FrostEbsworth diagram for element X5 points).

The equilibrium constant for the reaction 2 HF (g) H2 (g) F2 (g) is 0.220 at a particular temperature. What is the equilibrium constant for the equation H2 (g) F2 (g) HF (g)

Select correct properties of alphahelices O A. Small amino acids, glycine and alanine, are frequent in alphahelices. O B. Nterminal and Cterminal regions of long alphahelices are enriched with charged amino acid residues to compensate for the dipole charge created by aligned peptide groups. O C. Alphahelices are stabilized by interactions between

To treat a burn on his hand, a person decides to place an ice cube on the burned skin. The mass of the ice cube is 10.0 g, and its initial temperature is 14.0 C. The water resulting from the melted ice reaches the temperature of his skin, 28.2 C. How much heat is absorbed by the ice cube and resulting water Assume that all of the water remains in

Use the following word bank to create a concept map for lipids. adrenal corticosteroid, aldosterone, bile salt, cephalin, cerebroside, cholesterol, cortisol, cortisone, estradiol, fats, fatty acids, glucocorticoid steroids, glycerophospholipid, lauric acid, lecithin, lipids, linoleic acid, linolenic acid, mineral corticosteroid, myristic acid,

Provide a retrosynthesis (design a retrosynthetic map) using the scheme given below with 5?methyloxolan?2?one as the starting material. Use the table attached below as the carbon sources for the target compound. Use any reagents/catalysts. acetaldehyde ethanol propanoic acid acetid acid (chloromethyl)benzene (benzyl chloride) ethyl bromoacetate

CH3 CH3 0 HC O

One mole of ideal gas initially at 750 K and 11.84 atm undergoes a four step mechanically reversible cycle in a closed system. First pressure decreases isothermally to 4.93 atm then pressure decreases at constant volume and change in Enthalpy 8730 J then volume decreases at 3D constant pressure with change in internal energy 5334 J and finally,

1. Draw Reaction Coordinate Diagrams that correspond to the following conditions given below a) Draw a diagram which corresponds to a onestep reaction where the Keg 1 b) Draw a diagram which corresponds to a twostep reaction that is overall exergonic where the second step is ratedetermining c) Draw two diagrams of exergonic reactions which

From equation, Calculate the value of radius of orbitals of hydrogen atom up to n7. Also find the difference of radius between orbitals. r nhErmZ

En Zem8E,nh From the above equation, Calculate the value of energy of orbitals of hydrogen atom up to n 7. Also find the difference of energy between orbitals. 05

From equation, calculate the value of ba up to n 7. Also tells whether orbital is circular or elliptical in shape. b a I1n

Discuss origin of spectral lines in different orbitals. Also write a note on different spectral series.

a) Halides of B and Al are Lewis acids. Comment upon it. b) CACO3 decomposes on heating but Na,CO3 does not. Give reason. c) Transition metals are less reactive than alkali and alkaline earth metals. Give reason. d) Among Co2 and Co3 which should be a better oxidizing agent Why e) Why Sc3 is more stable than Sc2 f) Why the second ionization energy

Give short answer to following questions 2x10 a) On the basis of MOT, explain the magnetic character of NO molecule. b) How does the MOT account for bond order of N and O. c) PCls can be formed but NCI5 cannot be. Why d) Give the shape and hybridization of CS2, AlCls, NH. and ICl. e) The bond angle of NH3, PHs and AsH3 decrease in the same order

Calculate Mass of KSCN use to prepare 500ml 0.01M KSCN solution.

Differentiate between primary and secondary standard. How would you standardize the given AGNO3 solution

Write safety rules for handling glassware in lab.

The smallest portion of the lattice is known as. Select one O a. Lattice point O b. Bravais crystal O c. Unit cell O d. Lattice structure

The smallest portion of the lattice is known as. Select one O a. Lattice point O b. Bravais crystal O c. Unit cell O d. Lattice structure

The correet increasing order of hasic strength for the follwing compounds is NH, NH, CH, O a. II I III O b. III I II O c. II III I O d. III II I

(1) In a precipitation residual titration using AgNO3 VS as the excess titrant and NH4SCN VS as the back titrant, the endpoint in the sample titration is indicated using the Mohr method to precipitate the excess AgNO3. (II) In a precipitation direct titration with blank determination using AgNO3 VS, the endpoint in the blank titration in a Fajans

(1) In a complexometric residual titration using N22EDTA VS as the excess titrant and ZnSO4 VS as the back titrant, the endpoint in the sample titration is indicated by the complexation of zinc with the metallochromic indicator. (11) In a complexometric direct titration with blank determination using Na2EDTA VS, the endpoint in the blank titration

Complete the statement: To derive a fundamental equation the process must be______________________

complete the following dH dA 3D dn, dn

The rate of movement of two elemental components E and F in a chromatographic column are 1 x 10 mms and 9 x 104cmhr respectively. The distance covered by the mobile phase front is 1.0 m. The solute distribution ratio is 25 x 102 and the retardation factors are 3 x 104 and 5 x 10 2 for E and F, respectively and efficiency of the chromatography is

Find the Volume of HCl use to prepare 250ml 0.02M HCl solution.

For the circuit shown in the Figure, the value of Vo is 82 j62 ww V. ell 445 A 2V, O a. 11.26L81.04 V O b. 8.45L 3.96 V O c. 5.63L171.04V O d. 14.075L 8.96 V

Match the items in Column A with what complements it in Column B.

Column A Column B 1. Chemical a. Dioxide 2. Lewis b. Atom 3. Valance c. Electrons 4. Electronegative d. Structure 5. Carbon e. Compound

Match the items in Column A with what complements it in Column B. Column A Column B 1. Chemical a. Dioxide 2. Lewis b. Atom 3. Valance c. Electrons 4. Electronegative d. Structure 5. Carbon e. Compound

Why is Lewis Structure important

Why is Lewis Structure important

3.2 The resolution of a TEM is limited by diffraction (Rd) as discussed in and by the spherical aberration which is expressed as: Rsph = Cs3, where Cs is the spherical aberration coefficient and is the half-angle of the cone of light entering the objective lens. The TEM resolution is the quadratic sum of the diffraction resolution and spherical

Draw the Lewis Structure of the given. Carbon (C) Oxygen (0) Sodium Chloride (NaCl) Nitrous Oxide (N20)

Draw the Lewis Structure of the given. Carbon (C) Oxygen (0) Sodium Chloride (NaCl) Nitrous Oxide (N20)

Draw the Lewis Structure of the given. Carbon (C) Oxygen (0) Sodium Chloride (NaCl) Nitrous Oxide (N2O)

Match the items in Column A with what complements it in Column B. Column A Column B 1. Geometry a. Water 2. Molecules b. Moment 3. Dipole c. Electrons 4. Valence d. Bond 5. Chemical e. Tetrahedral

Why is Polarity of Molecules important

Why is Polarity of Molecules important

Compare and contrast the glucose oxidase and hexokinase methods of glucose determination and relate these procedures to the clinitest method.

Determine the polarity and molecular geometry of the following compounds based on electronegativity differences.

Molecular Polarity Geometry 1. HBr 2. PH 3. Sis2 4. O2 5. i

Determine the polarity and molecular geometry of the following compounds based on electronegativity differences. Molecular Polarity Geometry 1. HBr 2. PH3 3. SiS2 4. 2 5. (3

Differentiate the structures of functional groups in terms of representing organic compounds.

Unique Feature 1. Alkane 2. Alkene 3. Alkyne 4. Benzine Ring 5. Amine 6. Alcohol 7. Ether 8. Alkyl Halide

Differentiate the structures of functional groups in terms of representing organic compounds.

1. Alkane 2. Alkene 3. Alkyne 4. Benzine Ring 5. Amine 6. Alcohol 7. Ether 8. Alkyl Halide Unique Feature,9. Thiol 10. Aldehyde 11. Ketone 12. Ester 13. Carboxylic Acid 14. Amide

What is the importance of different functional groups

What is the importance of different functional groups

Give common examples for each of the following.

Example 1. Alkane 2. Alkene 3. Alkyne 4. Benzine Ring 5. Amine 6. Alcohol

Give common examples for each of the following.

Type 1. Alkane 2. Alkene 3. Alkyne 4. Benzine Ring 5. Amine 6. Alcohol Example,7. Ether 8. Alkyl Halide 9. Thiol 10. Aldehyde 11. Ketone 12. Ester 13. Carboxylic Acid 14. Amide

Enlist uses of polymers. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Enlist uses of polymers. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

Why do polymers exist

Why do polymers exist

Cite the use of the given polymers. 1. Epoxy resins 2. Slime 3. Silicone 4. Nylon 5. Polystyrene

Cite the use of the given polymers. 1. Epoxy resins 2. Slime 3. Silicone 4. Nylon 5. Polystyrene

Why are polymers important

Cite the difference and similarities of the types of polymers using a Table.

Topic POLYMERS Type 1 Natural Type 2 Synthetic Type 3 Organic Type 4 Inorganic Table 1 Difference

Cite the difference and similarities of the types of polymers using a Table. Topic POLYMERS Type 1 Type 2 Natural Type 3 Organic Type 4 Inorganic Table 1 Synthetic Difference ,Similarities

Cite examples of polymers

Cite examples of polymers 1. 2. 3. 4. 5.

Why are biomolecules important

Cite 5 uses for each type of Biomolecule

CARBOHYDRATES 1. 2. 3. 4. 5. LIPIDS 1.

Cite 5 uses for each type of Biomolecule CARBOHYDRATES 1. 3. 4. 5. LIPIDS 1. 2. ,2. 3. 4. 5. ,PROTEIN 1. 2. 3. 4. NUCLEIC ACID 1. 2. 4. 5. 3. 5.

Differentiate and Similarize the four types of biomolecules

CARBOHYDRATES LIPIDS (Difference) (Difference) SIMILARITIES NUCLEIC ACID PROTEIN (Difference) (Difference)

Differentiate and Similarize the four types of biomolecules

CARBOHYDRATES LIPIDS (Difference) (Difference) SIMILARITIES NUCLEIC ACID PROTEIN (Difference) (Difference)

Write synonymous words for the following scientific terminologies

Scientific terminology Synonymous Word 1. DENSITY . 2. BONDING b. 3. ORBIT . 4. BOILING POINT d. 5. FREE STATE e.

Write synonymous words for the following scientific terminologies Scientific terminology Synonymous Word 1. DENSITY . 2. BONDING b. 3. ORBIT C. 4. BOILING POINT d. 5. FREE STATE .

Arrange the letters to reveal the hidden word.

1. GIBLOIN TIPON 2. SEGAS 3. SENDITY 4. BINGDON 5. BILISTULOY 6. TORBALI 7. MASIG 8. BACORN 9. REEF TASTE 10. DIZATIONHYBRI

Define the following 1. BOILING POINT 2. DENSITY 3. SIGMA 4. ORBITALS 5. BONDING

How many sigma (a) and pi (n) bonds are in the following compound ) sigma 28. pi 4 sigma 24. pi 7 O sigma 12. pl 4 gma 27, pr 4

In this final post, you will be applying what you have learned in the class to the real world. Choose an article involving chemistry published within the last six months. Explain how a chemistry topic you learned in this course can be used to understand the chemistry behind this article. Be sure to cite your source in the APA citation

How many sigma (a) and pi (n) bonds are in the following compound ) sigma 28. pi 4 sigma 24. pi 7 O sigma 12. pl 4 gma 27, pr 4

Two samples are irradiated with fast neutrons in the same vial. The KAr age of one of them (the monitor) is known. It is observed that some of the 39K of the samples is transformed into 39 Ar. Using the monitor to assess the yield of the nuclear reaction, devise a method to infer the KAr age of the unknown sample from the age of the monitor and

8 A 4000 3500 3000 250 2000 1500 1000 WAVENUMBER cm1 1H (s) 5H (m) 2 H (d)