Enzyme X exhibits maximum activity at pH = 10.5. X shows a fairly sharp decrease in its activity when the pH goes much lower than 9.5. One likely interpretation of this pH activity is that: a. A His residue on the enzyme is involved in the reaction b. a Glu residue on the enzyme is involved in the reaction c. a Tyr residue on the enzyme is involved in the reaction d. the enzyme uses NADH has a cofactor e. the enzyme uses coenzyme A has a cofactor Please explain why, thanks!

Q: 9. Karks) Calculate 4H for the process in which Cl2(g) initially at 298.15 K at 1 bar is heated to…

A: ∆H=nCpdT        = 22.85+0.06543TK-1.2517×10-4T2K2+1.1484×10-7T2K2dT…

Q: What reaction takes place for limiting and theoretical yields? CuSO4(aq)+Fe=>FeSO4(aq)+Cu(s)…

A: Displacement reaction is the reaction where the more reactive metal displaces the less reactive…

Q: Exercise 2N₂O5(soln) → 4NO₂(soln) + O₂(g) Time (s) 0 200 400 600 800 1000 1200 1400 1600 1800 2000…

A:

Q: Which molecule best fits the NMR spectrum?

A: A question based on NMR spectrum. A multiple choice having structure of 5 organic compounds and a…

Q: consider the following kinetic data for a certain reaction: t (min) [A], (M) 0.00 0.500 20.0 0.382…

A: Answer will be 69.3.

Q: a. b. Ph Ph OH Br t-BuOK H₂SO4 Heat

A:

Q: 1. What is the percent composition of each element in MgBr2? 2. Calculate the percent composition of…

A: %Composition can be calculated as :    %composition = mass of components / total mass ofmolecules…

Q: H H₂C Draw the major isomer. Select Draw Rings -Br CH3 More C H 0 H₂O Erase Major and Minor isomers…

A: In presence of water, elimination reaction takes place. Now we have to find out the products as…

Q: OH CH3 -OH OH OH CH3 H₂SO4 Heat H₂SO4 Heat H₂SO4 Heat H₂SO4 Heat b *2 Products* 8 + 8

A:

Q: A 7.00 L tank at 23.7 °C is filled with 13.2 g of carbon dioxide gas and 3.50 g of sulfur…

A: Given, mass of Carbon dioxide (CO2) = 13.2 g mass of sulfur tetrafluoride (SF4) = 3.50 g Mole…

Q: 14.38 Write the balanced chemical equations for the (1) reaction of each of the following amines…

A: The balance chemical equation is given below :

Q: Write the equilibrium constant expression, K, for the following reaction. Please enter the compounds…

A: The given equilibrium reaction is  CH3NH2 (aq) + H2O(l) ⇌CH3NH3+ (aq) + OH-(aq) The equilibrium…

Q: QUESTION 3 What is the IUPAC name for the compound shown below? CH3 CHCHCH H C CH CH2CH2 CH3

A:

Q: Which of the following is TRUE? O Ar is smaller than Ne O Ba2+ is smaller than Baj O is smaller than…

A: Size increases as we move down the group of the periodic table. Size decreases as move from left to…

Q: 6 IR: strong peak at 1750cm-1 1H 3+2= 3 PPM 3H 6H

A:

Q: The blue-green line of the hydrogen emission spectrum has a wavenumber of 20580 cm-¹. Calculate the…

A: Given, the wavenumber of blue-green line of hydrogen emission spectrumequal to 20580 cm-1.We are…

Q: The British thermal unit (Btu) is commonly used in engineering applications. A Btu is defined as the…

A:

Q: What is the IUPAC name for this compound? CH3 CH=CH2

A: 1. Select the principle carbon chain 2. Numbering 3. Naming (prefix + word root + suffix)

Q: For the following combustion reaction CH₃CH₂OCH₂CH₃(l) + 6O₂(g) → 4CO₂(g) + 5H₂(g) ∆H = -2.72 ×…

A: Diethyl ether react with oxygen and produced four mole of carbon dioxide and five mole of water…

Q: Lactic acid solution is formed. a. b. Write the reaction where Lactic acid is reacted with water.…

A:

Q: The empirical formula for buckminsterfullerene is C1, and its molar mass is 720.6 g/mol. What is its…

A: Molecular formula= n × empirical formula

Q: The molar mass is 876.16 g/mol.    If you have 5.0 mL of this oil, how many moles does it contain?…

A: Given --> Density = 0.79 g/mL  Molar mass = 876.16 g/mol  Volume = 5 ml  Density = Mass / Volume…

Q: iven the data in the table below, ΔH°rxn for the reaction C2H5OH (l) + O2 (g) →…

A:

Q: Which is NOT a variable in the Beer-Lambert law? the absorbance of the sample the path length…

A: Answer: Beer-Lambert law gives us a mathematical expression to find out the unknown concentration…

Q: The equilibrium constant, Kc, for the following reaction is 1.29×10-² at 600 K. Calculate Kp for…

A:

Q: Designate each of the chirality centers in the following compound as R or HO CH3 m CHCI2 CI b Select…

A:

Q: 6. Which of the following is not a constitutional isomer of the others? LOH -OH

A: Constitutional isomers are the compounds having same molecular formula but differ from each other in…

Q: When active metals such as sodium are exposed to air, they quickly form a coating of metal oxide.…

A: Please find the below attachments.     Thank you

Q: Draw bond like structure for 2,3,4-tribromoaniline

A:

Q: A. C. H H-C H-C-NO H HIC-H H-C- H HON 1-00 H :O B. D. H-C-NO H 0 I-U-I H-C-N 00

A: Formal charge is basically the difference between no of valance electron of an atom in it's free…

Q: 12) Chemical Formula: C9H200 IR: strong broad 3300cm-1 5 1H 9x2=18+2=20-20=0 1H 3 PPM 2 18H 0

A: The chemical formula of the unknown organic compound is C9H20O.

Q: A 20.8 mL of EDTA solution ( 2.0M) was used in a titration to determine the hardness of the water.…

A: Here given that,  Volume of EDTA used  = 20.8 mL  Molarity of EDTA  = 2.0  M  Volume of water sample…

Q: 13.17 Predict the multiplicity of the signal indicated below in its 1H-NMR spectrum. CI

A:

Q: 3) A sample vial containing a mixture of phenol, benzene, and bromobenzene was not carefully sealed…

A: Given data :

Q: How many chirality centers are present in the following compound? لا Select one: O A. 4 O B. 2 2 OH

A: Chiral center is a atom in a molecule that is bonded to 4 different groups.

Q: QUESTION 5 What is the IUPAC name for this compound? CH3 CHCHCHCHCH CHCH

A: In IUPAC Nomenclature,we have to follow some rules. First we have to identify the parent chain( the…

Q: 3. How many grams are in 3.45 X 10-4 formula units of FeO? 4. How many moles are in 69.3 g of…

A: 1 mole = 6.022×1023 (Avogadro's number ) The mass of one mole of formula units of an ionic substance…

Q: 5. You start with 25.00 mL of 1.00 M NaOH. After 4.32 g leaves produce CO₂ over a period of days,…

A:

Q: 13.18 Briefly explain how you could use ¹H NMR to distinguish between the following compounds. and

A: 1H nmr is very much useful here.  Here the main fact is in first compound, there are three signals…

Q: Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a…

A:

Q: Exp. No. 4 5 6 Volume of Acetic acid Volume of Water Mass of beaker and liquid Mass of Alka Total…

A: Alka seltzer tablet contains citric acid, acetylsalicylic acid and sodium bicarbonate(NaHCO3). In…

Q: piece of unknown metal has a mass of 217 g. The metal absorbs 1.43 kJ of heat, its tempeature…

A: Given data  Heat absorbed by the metal = 1.43 KJ= 1.43×1000 = 1430 J  (1 KJ = 1000 J) M = mass of…

Q: A 1.00 L rigid cylinder contains one mole of neon gas at 25 °C. Calculate the pressure using (a) the…

A: a) ideal gas law : P  = nRT/V Given: n = 1 T= 25o C = 25 + 273.15 = 298.15K V = 1 L R = 0.082057338…

Q: In the reaction below, ΔH°f is zero for ________.                 Ni (s)  +  2CO (g)  +  2PF3 (g)…

A: Ni (s) + 2CO (g) + 2PF3 (g)  → Ni(CO)2(PF3)2 (l) We have to find the substance for which ΔH°f is…

Q: BH OWH a) Underline any compounds that have AROMATIC character, and circle any compounds that have…

A:

Q: Question 1: The sample contained the three isotopes 24Mg, 25Mg and 26Mg. The percent abundance of…

A:

Q: Fill in the name and empirical formula of each ionic compound that could be formed from the ions in…

A:

Q: Classify each of the following amines as primary (1°), second- ary (2°), or tertiary (3°): NH₂ a.…

A: The degree of amines can be explained on the basis of attachment of nitrogen atom to alkyl groups.

Q: The following mechanism has been proposed for the conversion of tert-butyl bromide to tert-butyl…

A: In substitution reaction one species is attack on substrate and and  takes place the position by…

Q: What is the Victor-Meyer test? Describe how it is performed including reagents and describe the…

A: Introduction- Victor Meyer created the test that separates primary, secondary, and tertiary alcohol.…

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.