Chemistry Questions and Answers June 16, 2020

1) (4 pts) This form accompanies the online kinetics activity. Please use it to answer the following questions Step1 a) Attach the printout of your kinetic trace and fill in the following data table Volume of dye solution 9.9 mL. Concentration of bleach solution 090 m Volume of bleach solution 30mL b) What are the initial concentrations of Dye and

According to art. 525 of the Argentine Food Code, refined oils must present an Acidity Index of less than 6 mg of KOH / g of sample. Sample Mass Sample NaOH volume 0.5 N f = 1.0000 % Oleic acid Oil I 1,7500 g 0,3mL Oil II 1,3200 g 0,6mL Oil III 0,9 Express the maximum limit of the Acidity Index given in the Argentine Food Code as% of oleic acid

Show how vou would synthesis the compound below starting with toluene. Include the reagents needed in your synthesis,

Imagine the simple complex (n2CH4)2Zn pictured below. Zn ,d) Construct a simple MO diagram of the interaction of these orbitals. Label all bondingantibondingnonbonding orbitals.

In the moved in order to increase the delay between the dissociation pulse by an additional 1 ps apparatus (Figure 8(a)), how far must the mirror be ,Frequency subtractor Moving mirror BS Femtosecond laser sample BS BS D BS beam splitter Figure 8(a) Probe pulse Dissociation pulse

calculate ln Ksp

2 3 1 5 5 7 B 9 0 1 Temp (C) 10.0 15.0 21.4 26.0 32.5 34.9 43.5 44.1 50.8 55.3 Avg Volume of Borax (ml) 8.80 7.10 7.20 6.99 7.12 7.00 7.10 7.00 1.10 6.89 Avg Volume HCI (mL) 2.95 2.72 3.58 4.81 7.50 6.13 5.99 22.05 19.93 16.94

A nuclear reaction that is used to power space vehicles is Plutonium-238 undergoing alpha emission. A) Write the balanced nuclear equation for this reaction. B) How much energy is generated by this reaction in J/nuclei and kJ/mol? The atomic mass of Pu-238 is 238.04955 amu The atomic mass of U-234 is 234.04094 amu The atomic mass of an alpha

Which of the following statements concerning radiation absorption by living tissue isare CORRECT The quality factor takes into account the differences in damaging power 1. of the various forms of radiation. 2. One gray denotes the absorption of 1 joule per kilogram of tissue. The Sl unit for biological damage is a sievert (Sv), which is determined

What is the purpose and background in your own words of an Aldol reaction synthesis of dibenzalacetone and UV - visible spectroscopy organic chemistry experiment ?

pick one rxn and label (stille, Suzuki, etc) what aspects made you pick that name? what variations could be made of the two molecules and still have coupling rxn.

NE

The maximum safe level of each compound in drinking water is given below. Convert each value to parts per million. a. chloroform (CHCI3, a solvent), 80 ugkg b. glyphosate (a pesticide), 700 ugkg A flask contains two compartments (A and B) with equal volumes of solution separated by a semipermeable membrane. Which diagram represents the final level

Predict the major products if we mistakenly used acetophenone in iodination of 4-hydroxy acetophenone experiment?

Consider the temperature versus composition diagram for a binary system of substances A and B: Initially, the mixture is at 72 o C and the molar fraction of B is equal to 0.1. a) The number of phases and the initial composition of the system. b) The number of phases and their composition when the molar fraction of B is increased to 0.3. c) The

100 vapor 90 a liquid vapor 80 B liquid vapor 70 a liquid B liquid 60 0.0 0.2 0.4 0.6 0.8 1.0 mole fraction B temperature (C) a liquid B liquid

For the reaction, HOCHCHCHOH HOCHCHCHOH which designation should be placed over the arrow NAD NADH NADH NAD FAD FADH2 FADH2 FAD ,For the reaction, HOCHCHCHOH HOCHCHCHOH which designation should be placed over the arrow NAD NADH NADH NAD FAD FADH2 FADH2 FAD

Write a sequence of ARM assembly instructions to insert the bits 31 24 from register R1 into bits 11 4 of register R0. The other bits of register r0 and register r1 should remain unchanged.

According to the plate theory in chromatography, the Height equivalent to a theoretical plate can be calculated if we know one of the following quantities. O The retention time of the analyte, the peak width at base and the column length. O The retention time of the analyte, the peak width at base only. The retention time of the analyte only. The

The solubility of the sample components in the stationary liquid phase in GLC should not be too good in order to, (1 Point) allow separation of the most volatile components. separation in a reasonable time allow fast separation. O use helium as the carrier gas.

From tubes 3-8, write hydrolysis equation (water added) to the substance (NaCl, ZnCl2, etc.) calculate concentration of H3O+ and OH- calculate ka and kb with equation: kw=ka x kb kw= 1.0 x 10^-4 pH for test tubes 1-8: 1: 4-6 2: 7 3: 4-6 4: 7 5: 4-6 6: 4-6 7: 7 8: 12-14 ?

Test Tube 1 2 3 4 5 6 7 8 Substance Unboiled Distilled Water Distilled Water 0.1 M NaCl 0.1 M ZnCl 0.1 M NH.C1 0.1 M KAI(SO4)2 0.1 M NaCHO 0.1 M NaCO3 From your results, calculate the concentration of H3O and OH. Write the Chemical equation that occurs in each test tube and calculate the K, and Kb of the solution as appropriate. Dispose of your

An antibiotic was given in a dose = 300 mg single IV bolus dose, plasma concentration after 2 hr was ( Cp2 = 5.5 mg/L ), and after 6 hr was ( Cp6 =4.7 mg/L ). The drug follows one first order and one compartment model kinetics) The drug is not effective when plasma concentration is 0.5 mg/L. the duration of action of 300 mg of this antibiotic is?

Methylene blue is a redox indicator which gains 2 electrons as it is transformed into its reduced form. Its standard potential is E 0.53 V. The effective range of this indicator with respect to S.C.E. is V (lower bound) to V (upper bound).

Question 5 The following trisaccharide derivative is important to human health. Not yet answered The B and C rings are called Marked out of 1.00 P Flag question B A OH O a. sucrose b. none of the other answers cellobiose O d. maltose O e. lactose ,Question 6 5Deoxyglucose will close to a Not yet answered . thanose Marked out of b. none of the

103. Consider the reaction shown here occurring at 25 C. MISSED THIS Read Section 20.5, Watch KCV 20.5, IWE 20.6 A(s) B2(aq) A (aq) B(s) AGXN 14.0 kJ Determine the value of Eel and K for the reaction and complete the table. B2 A21 Ecell AGxn 1.00 1.00 1.00 1.00 x 104 1.0 x 104 1.0 3.54 x 103 1.0

5. The picture below represents an electron diffraction pattern LazZnOSe looking down the caxis. The researcher who made the material initially recorded an Xray diffraction pattern and tried to index it using a tetragonal unit cell. This wasn t successful. Looking at the pattern below, can you suggest why,2 1hm

What is the product of the chlorination of 1-Isopropyl-1-methylcyclopentane?

In an expeniment on zield of suyon beute (tomsacu) there cwere two levels o inrigation tneatiment, and thaee of Letilizen each combination of tneatment coas canried out in 5 replicante. the following valuus of tim tauares ( s) cwere ss(Fentiliz en) 2217 s3 (Enmon) 108 0 treatment and ottained ss (Innigation 120 0 8(Intendction) 35 0 Assuming tat

Explain the pyranose structure for glucose.

A student wonders, Will changing the volume of alcohol in a boiling point experiment change the boiling point of the liquid Identify what would be a valid method for testing this research question. O Take several volumes (ex 50 ml. 100 ml. and 150 mu of one type of alcohol and boil them at constant room pressure. Record the temperature each boils

Rice starch has been used as template in nanoparticles synthesization. Can someone explain the interaction between calcium peroxide nanoparticles and the rice starch that make it as a capping agent based on their properties.

The distrbution of the energy of particles in a gas at temperature Tl is shown below. Number of particles with energy, E T1 E. Energy, E On the diagram above, draw the distribution of energy of particles at a lower temperature, T2. (1) Use the diagram to explain why the rate of a reaction increases with an increase in temperature.

Codeine (C18H21NO3 ), a weak base that is an ingredient in many cough syrups, is known to have addictive properties. People are now asked for identification when purchasing cough medicine containing codeine. What is the percentage protonation of a 0.0076 M solution of codeine, with pK, 5.78 Do not enter the sign as part of your answer.

X moles of NaHco, x 840 NaliCon 1 mole NaHCO, mass of NaHCO, to weigh Complete this calculation by using your answers to the last two questions. How much sodium bicarbonate will we need to weigh for this experiment O 252 O 100g O a0370g O 311

When the two operators 4 and act on the function 3ec so they Dont satisfy the uncertainty principle Skip Satisfy the uncertainty principle

Conventional methods such as titration are not suitable for a. Very fast reactions. b. None c. Reactions with halflife of few hours. d. Reactions with somehow slow rate.

Conventional methods such as titration are not suitable for O a. Very fast reactions. b. Reactions with halflife of few hours. . Reactions with somehow slow rate. O d. None

For the following identify what happens to each vairable. A weather balloon released in the tropics drifts high into the sky and floats towards the north pole. ( Choose ) Pressure Volume ( Choose ) Temperautre ose Moles Choose ) Rvalue (Choose )

The spheroidizing of pearlitic cementite below (LTC) refers to ballingup of the cementite (cm), utilized in the softening of tool steels and some of the air hardening of alloy steel. In such case ,steel can be drawn and will machine freely may be according to the followings Fine globules improve the surface O finish and helps dissolving during

A unimolecular reaction has a pre exponential factor of 20000. The entropy of this reaction (in Jmol.K) at 25 oC is then O a. 170.9 O b. 167.5 O c. 165.1 O d. None ,A unimolecular reaction has a pre exponential factor of 20000. The entropy of this reaction (in Jmol.K) at 25 oC is then O a. 170.9 O b. 167.5 O c. 165.1 O d. None ,A unimolecular

Propose a united-atom Molecular Mechanics Force Field (MMFF) for ONE (1) molecule that contains at least THREE (3) different organic elements with a total number of atoms in the range between 15 and 20. Provide with explanation all the energy expressions required to determine the potential energy of the proposed molecule.

Chose the major product of the reaction sequence shown. Assume heat for step one of the sequence. 1) , Ph 2) Ph3PCH2 3) HB, 23C Br Br Ph Ph Br Ph Br Ph A C D

How to interpret this data about limit of detection and limit of quantification for pure drug solution and drug suspension analysed by HPLC. HPLC conditions - mobile phase 0.1 % TFA:ACN in 55:45 v/v ratio. C18 5m column, flow rate 1mL/min, injection volume 10 L and UV detection is 240nm. concentration of drug samples to measure LOD/LOQ were: 20,

The number of absorption bands in 3 (Co ( en ) are a (2) b (4) (1) d (3) C

A salt M2X3, calculate the mean activity coefficient of M3 and X2 ions in a solution that has 0.1 M KNO3 and 0.1 M KCI, assuming DHLL to be applied, what is the solubility of M2X3 in that solution and in H20 (ksp M2X3 5.0 x 1016)

A 96 well plate assay is used to screen a library of compounds for inhibitors of biliverdin reductase, an enzyme that converts green biliverdin to yellow bilirubin. Enzyme activity is assessed through disappearance of the green colour. By mistake, one of the sample wells did not receive the enzyme. Assuming the library compound added to this well

Trial 1 Trial 2 Trail 3 Average Metal Pairs Anode Cathode Zinc Copper Calculations CuC 0.321 0.347 0.262 0.310 V PbC 0.737 0.745 0.762 0.748 V Concentration (M) Anode Cathode FeC 0.645 0.644 0.670 0.653 V Cell Potentials (V) Trial 1 Trial 2 Trial 3 0.908 0.894 0.859 ZnC 1.057 1.038 1.160 1.085 V Trial 4 0.820 1. Discuss if your electrochemical

Medium used for cellulase production contained (gL) NaNO3, 3 MgSO4.7HO, 0.5 KHPO4, 1 KC1, 0.5 and supplemented with 1 mL FeSO5.7H2O as trace element. The medium was adjusted to pH 5.5 and inoculated aseptically by adding Aspergillus terreus spore suspension (approximately 2x107 sporesmL) to 50 mL of sterilized medium containing 5 (wv) sugarcane

If I have 17.0 liters of gas at a temperature of 67.0 C and a pressure of 88.89 atm, what will be the pressure of the gas if I raise the temperature to 94.0 C and decrease the volume to 12.0 L? round to correct sig figs

I have an unknown volume of gas at a pressure of 0.50 atm and a temperature of 325 K. If I raise the pressure to 1.2 atm, decrease the temperature to 320 K, and measure the final volume to be 48 liters, what was the initial volume of the gas? round to sig figs

If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900. K, what will be the volume of the gas if I decrease the pressure to 52 atm and decrease the temperature to 750 K? round to sig figs

If I have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 C, what will be the new temperature if I decrease the volume of the gas to 2.4 L and decrease the pressure to 3.0 atm? round to sig figs

I have an unknown volume of gas held at a temperature of 115 K in a container with a pressure of 60atm. If by increasing the temperature to 225 K and decreasing the pressure to 30. atm causes the volume of the gas to be 29 liters, how many liters of gas did I start with? round to correct sig figs

If a gas in a closed container is pressurized from 15.0 atm to 16.0 atm and its original temperature was 25.0 C, what would the final temperature of the gas be (in C)? round to sig figs

A gas has a pressure of 0.370 atm at 50.0 C. What is the pressure at standard temperature? round to correct sig figs

If 0.65 moles of hydrogen occupies 9.0 L, how many moles must be added to inflate the balloon to 15.6 L? round to two sig figs

A 60 mL tank holds 52.0 moles of helium. What would the volume be if there were 87.3 moles of helium?

A sample of gas at 300 torr inside a steel tank is cooled from 500 C to 0 C. What is the final pressure of the gas in the steel tank? round to one sig fig

If 0.42 mole of helium occupies 9.9 L, how many moles must be added to inflate the balloon to 17.0 L? round to two sig figs

1. If I have 17.0 liters of gas at a temperature of 67.0 C and a pressure of 88.89 atm, what will be the pressure of the gas if I raise the temperature to 94.0 C and decrease the volume to 12.0 L 2. I have an unknown volume of gas at a pressure of 0.50 atm and a temperature of 325 K. If I raise the pressure to 1.2 atm, decrease the temperature to

3. If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900. K, what will be the volume of the gas if I decrease the pressure to 52 atm and decrease the temperature to 750 K 4. If I have 2.9 L of gas at a pressure of 5.0 atm and a temperature of 50.0 C, what will be the new temperature if I decrease the volume of the gas to

I have an unknown volume of gas held at a temperature of 115 K in a container with a pressure of 60atm. If by increasing the temperature to 225 K and decreasing the pressure to 30. atm causes the volume of the gas to be 29 liters, how many liters of gas did I start with

If a gas in a closed container is pressurized from 15.0 atm to 16.0 atm and its original temperature was 25.0 C, what would the final temperature of the gas be (in C) Hint You still need to convert to Kelvin, then convert back to Celsius 1. 2. A gas has a pressure of 0.370 atm at 50.0 C. What is the pressure at standard temperature

3. If 0.65 moles of hydrogen occupies 9.0 L, how many moles must be added to inflate the balloon to 15.6 L 4. A 60 mL tank holds 52.0 moles of helium. What would the volume be if there were 87.3 moles of helium

5. A sample of gas at 300 torr inside a steel tank is cooled from 500 C to 0 C. What is the final pressure of the gas in the steel tank 6. If 0.42 mole of helium occupies 9.9 L, how many moles must be added to inflate the balloon to 17.0 L

1.Non-covalent interaction between Atg8 and A2Protein-protein interaction ? difficult to target with Small molecule. Noted:- If you need more detail check this image. the green is represent Atg8 the yellow represent Atg3. 1.Non-covalent interaction between Atg8 and Atg3? 2.2Protein-protein interaction? difficult to target with small molecule.

Given the melting point profile of a membrane bilayer consisting of the phospholipid below:

HC HCO R HCo OCH,CH,NICH. Rpalminate With Cholesterol (part d) 0.12 0.1 0.12 0.8 0.1 0.8 0.6 0.6 0.4 0.4 0.2 0.2 10 12 2 10 Temp C The xaxis is temperature in Cand the yaxis is degree of fluidity (higher value means the membrane is more does the curve shift if (sketch new curves on the graph on the above left and label a b) a. Half the palminate

What is the decay constant for 131 if the halflife is 2.305 days 9.31x 105 s1 3.48 x 10651 4.81x 10451 9.98 x 10 751 ,01 points Of the following complex ions CrC(NH3)5R,(CrNH3)6,ICrCIH2Ols2t,(CrH2016, one appears yellow, one pink, one violet, and one bluegreen. Which is yellow both (CFCIH20)s2 and (CHCINH9I5 Next ,In the compound, CaNaFe(CN),),

The reaction below is described using AH 92 kJ 2 NH3 (g) N2 (8) 3 H2 (g) heatout, exothermic, AH () o heatin, endothermic, AH () O heatout, exothermic, AH () heatin, endothermic, AH ()

What is the name of both compounds?

.N. NH2 VS.

What is the major product of the following reaction (hint the reaction was occurs via Stock enamine intermediate) 1. TSOH (cat.) 2. EtBr 3. H,O

NMR and IR basic on those picture 4-methyl-1,5-dihydro-2H-benzo[b][1,4]diazepin-2-one

25.0 20.0 15.0 10.0 General Parameters 8192 11 SHData Size NS of Scans (sec) 5.0 (ppm)(Hz) 0.0 First Dimension N1Nucleus H1 F1Frequency 90.001 MHz 5.0 10.0 Second Dimension N2Nucleus NO F2Frequency 0.000 MHz

1. What type of decay does Tin-100 undergo? 2. Silicon39 atoms are unstable. What type of radiation is emitted during the decay of this atom? 3. What atom is formed during this decay with the decay of silicon-29?

1. What type of decay does Tin-100 undergo? 2. Silicon39 atoms are unstable. What type of radiation is emitted during the decay of this atom? 3. What atom is formed during this decay with the decay of silicon-29?

Give me the tricks to remember vitamins, sources, and their diseases?

WHAT IS THE COORDINATION NUMBER OF THE Au ATOM IN KAu(CN)2(SCN)2l D a. 2 Ob. 3 4 Od. 6

If a substance, at 1.0 atm of pressure is cooled from 400 K to 200K, (see the phase diagram below) what phase change will occur 3D 268 293 750 1000 Temperature (K) O vaporization O freezing O condensation O melting O sublimation Pressure (atm) 0.5 1.0 1.5

Calculate the mean activity coefficient for Ba and SO, ions in a saturated solution of BaSo, and 0.71 M NagPO O a. 0.002596 O b. 0.03246 Oc 1.110e6 O d. 0.2183 O e. 3.420e5

Estimate the radius of the ionic atmosphere (1k) for a solution of 0.08 M MgBr2 Given ( o KB T)(e2 L) 7.446 x 1016 3D O a. 8.92e10 m b.1.259 m O c. 1.05e9 m O d. 1.08e9 m e. 1.11e9 m

5. Complete the two multistep syntheses below. (12 pts each) A) Synthesize this compound from the given organic starting materials. You may use any inorganic reagents needed. ,B) Synthesize this compound using methyl acetate (CH3COOCH3) and organic alcohols having 4 carbons or less. You may use any needed inorganic reagents. Your synthesis must

The owner of Royal Foods Cafe (RFC) wants to develop a software application for his new restaurant. The aims are to keep track of orders, food and drinks on the menu, ingredients and their stocks. He is also interested in getting information about the most popular food items and drinks. You have been asked to design a database for Food Order

A structural formula of a monosaccharide is shown below HOH2C HO a. Classify this monosaccharide (e.g., ketotetrose) b. Does it have the D or L configuration. c. Specify the type of ring this structure has. d. Is the configuration of the anomeric carbon alpha or beta

Two solutions of equal volumes are separated by a membrane that is permeable Na and Cl but not to P. The initial concentrations are NaP side NaCl side Na 0.05 M Na 0.15 M P 0.05 M CI 0.15 M 3D Calculate the concentrations of Na on the left side (The NaP side) at equilibrium. O A. 0.210 M O B. 0.064 M Nat C1 Na2 C2 O C. 0.0439 M CI 12 C2 O D.

if the fatty acid 17:1delta 7 Is completely cannibalized to CO2 and H2O what would be the net yield of ATP?

What is the product and reaction type in the following reactions?

CH3 NBS hv Reaction Type Br H,0 Reaction Type H,SO, (aq) Reaction Type HNO, (conc) H,SO, (conc.) Reaction Type H,SO, (conc.) Reaction Type Br2 FeBr3 Reaction Type CH,CH,CI AIC, Reaction Type CH3CCI AICI, Reaction Type

Predict the product or provide reagents needed to complete each transformation.

1. Mg, ether 2. CO (a) 3. HO, H

Predict the product or provide reagents needed to complete each transformation.

(b) HO. (c) NaHCO, HO,

Predict the product or provide reagents needed to complete each transformation.

(d) K OH HO.

Predict the product or provide reagents needed to complete each transformation.

1. NaCN (0 Br 2. HO. H. heat NHCH, 1LAM (g) 2. HO, H

What is the product that we tested for in this experiment?

Tube Temperature Treatment DI Water Milk Lactase Total Volume 22 C 2 mL 2 mL none 4 mL 22 C 3 mL 1 mL 1 mL 1 ml 1 ml 1 mL 1 mL 1 mL 1 mL 1 ml none 4 mL 22 C 2 mL 4 ml 4 C 2 mL 4 mL 37 C 2 mL 4 ml 4 ml 6. 80 C 2 mL What is the product that we tested for in this experiment O Lactase Galactase Glucose Lactose O Galactose 123 4 ,Tube Temperature

Complete the following synthesis. Draw the mechanism for every step. Complete the following syntheses. You do NOT need to show the mechanism 1. H2N Novocaine 2. . 3.

a) How many hydrogen bonds would exist between the following DNA strand b) SHOW how you arrived at your answer. Merely saying 10 bonds is insufficient. c) Identify the 3 and 5 ends of the complementary segment d) Show how you determined the complementary segment GCATGC

Use the following table to find the mass of the reagents used to synthesize your kidney stone. Note that this information was also included in the synthesis videos that you watched in Part 1 of this project. You will also find the mass of the kidney stone after it dried for 7 days and 12 days in the spreadsheet. Volume of Volume of 7 Day 12 Day

Explain the mechanism of emulsion polymerization of polystyrene. Sketch an illustration to describe each step involved in that polymerization.

Fucuse, one of the right esenlial mouosaccharides, in besywthestrd firem GDP e by a ltitep atien segurer lring hr ceryme NADPIL De d an te show the movement of electrs in this strp of the resction rchansin Arrowpushing Instructions OGDP OGDP H3C A OH OH O to

A set of known concentrations of Red 40 dye solution was used to make a calibration plot of absorbance vs. concentration (in ppm). The slope of the best-fit line was 0.067 ppm 1. A 5.0 mL aliquot of strawberry soda was diluted to a final volume of 100 mL with deionized water. The absorbance measurement of the diluted soda solution was recorded as

Let us consider a decomposition reaction with a reactant '13' and the rate of reaction is absolutely depended on B's concentration. From different batches of the same experiment it was found that. with varying concentration of 'EC the rate of reaction remains fairly constant. What was the order of the reaction? Show the calculation steps.

For the following problems, youll be dealing with some fictional elements again. Here are their properties Element Name Identity Ct Cattium Transition metal Px Purrium Gr. IlIIA Nonmetal Ny Noodline Gr. VA Nonmetal Ff Fluffygen Gr. VIA Nonmetal Ws Whiskerine Gr. VIIA Nonmetal 6) Balance the following using the halfreaction method a. CtWs3 H202

Show the electron transfers, and what two amino acids from this enzyme would interact with the phosphate carbon?

H. cCH2OPO3 H2C CH2OPO, O. Glues Glu165 CH2 CH2 Hisgs Hisgs Hc. HC. CH2OPO, CH2OPO3 H 00 H2C HcOH OH Gluies Glu165 H. N CH2 CH2 Hisgs Hisgs H C. CH,OPO, CH H2C H. Gl165 N. CH2 Hisgs

Use equation above to plot a tafel cathodic curve for n <0.15 volts, (calculate for the current value for( -0.1, -0.25, -0.45, and -0.6)? Then plot log i vs overpotential

O 2e i io. exp nF RT kf kb R exp 1) acnF n RT

Consider the system of nonlinear chemical reaction A, X, BXk2, Y D, 2XY 3X, X4, C, where ks are the rate constants, and the reactant concentrations of chemical species A and B are kept at constant values of a and b, respectively, for all time. (a) Write the governing differential equation system, according to the law of mass ac tion, for the