Chemistry question and answers for September 07, 2023
- Q Complete the following tableSolution[H3O+][OH-]pOHacidic, basic, neutralOrange juiceMilk1a) Calculations for orange juicepH= 4.5b) calculation for milkpH= 6.0
- Q Formic acid (HCOOH) has Ka= 1.8x10-4. What is the pH of a 0.01 Msolution of formic acid ?PLEASE HELP I HAVE EXAM
- Q l2. Determine the mole fraction of zinc(II) sulfite ina 4.22 M aqueous solution of zinc(II) sulfite. The density of thesolution is 1.01 g mL-1. answer is not 0.0699
- Q what effect does ligand exchange cause for cancer therapy?preferably ruthenium complexes vs platinum complexes
- Q What do enzymes do and how do they do it (this question isintentionally vague and open ended)?
- Q What is the initial pH of a titration of 25.0 mL of 0.126 MNH3 with 0.287 M HCl? Kb = 1.8 x 10-5Â Â SHOW WORKa. 11.18b. 7.00c. 2.82d. 1.04e. 0.54
- Q Find the length and width of a square basin for virusdisinfection of a flow of 5 MGD. You may assume a depth of 5 ft, aCxt product of 20 (mg/L)...
- Q Explain why quantum numbers stop following the expected trendfor elements at potassium, while they do follow the expected trendfor ions.
- Q 1-Mention the  uses ofacetanilide?2-Why glacial acetic acid is used in preparation ofAcetanilide from aniline?
- Q Use the method of successive approximations to determine the pHand concentrations of H2A, HA–, and A2– in a solution of 0.00273 Mmonopotassium fumarate (KHA). The pKa values for fumaric acid...
- Q As with any combustion reaction, the products of combusting ahydrocarbon fuel (CxHy) with oxygen (O2) are carbon dioxide (CO2)and water (H2O).A mass of 16.89 g for an unknown fuel was...
- Q Discuss the relevance of of qualitative anaysis for metals inwater (i.e. metals in aqeous soultions). For example, what is theusefullness of qualitative anaylysis and what use could suchanalyses of metal...
- Q Design a buffer that has a pH of 4.86 using one of the weakacid/conjugate base systems shown below. Weak Acid Conjugate BaseKa pKa HC2O4- C2O42- 6.4×10-5 4.19 H2PO4- HPO42- 6.2×10-8...
- Q Of the original “undiluted†sample from Question 1(see below),10L of a 5-to-1 dilution were used to measure proteinconcentration. With the use of a standard curve, this is found tobe 140g....
- Q A student wishes to determine the chloride ion concentration ina water sample at 25 °C using a galvanic cell constructed with agraphite electrode and a half-cell of AgCl(s) + eâ»...
- Q Calculate BOD5 of all 3 samples.SourceVolume of BOD(mL)Volume of WW sample added (mL)Initial DO (mg/L)ddddddFinal DO(mg/L)dddddDilution factor (P)dddddddSeed ControldddddddddAmount of Seed added (mL)ddddddBOD5 (mg/L)ddddddddddSample 1MWW30056.903.600.0167WAS1Sample 2MWW30056.604.230.0167WAS1Seed Control30056.816.560.0167WAS1
- Q An air stream is saturated with a vapor (B) at 130ï‚°F and 1 atmpressure. It is cooled down to 80ï‚°F where some of the B iscondensed and separated from the...
- Q How will you prepare 250 mL of 0.01 M NaOH from NaOH pellets?Please describe in detail how to properly handle,weight, and dissolve the NaOH pellets, and how you would store...
- Q Compressibility, τ, is defined as: τ = − 1 /ν *(dν/ dp) Showthat the ratio of the isothermal compressibility to the isentropiccompressibility is equal to the specific heat ratio for...
- Q If a histidine sidechain in a binding site is protonated in thefree protein, but deprotonated in the ligand-bound state, how wouldpH affect the interaction?A.) No effectB.) Lower Kd at lower...
- Q Calculate the mass of ammonium chloride required to prepare 25mL of a 2.0 M solution, and the mass of calcium chloride requiredto prepare 25 mL of a 2.0 M solution.
- Q Le Chatelier's principle states that a chemical system must havea shift in direction in order to force the system to reachequilibrium.a.trueb.false
- Q Consider the diprotic acid h2a with k1=1.00x10-4 andk2=1.00x10-8. find the pH and concentrations of h2a, ha-, and a2-in (a) 0.100 M H2A (b) 0.100 M NaHA (c) 0.100 M Na2A
- Q The three reactions below are all at equilibrium simultaneouslyin solution.Ca2+ (aq) + C2O42- (aq) « CaC2O4 (s)H2C2O4(aq)«H+(aq)+HC2O4-(aq)HC2O4- (aq) « H + (aq) + C2O42- (aq)a. If HNO3 is added to...
- Q A 100 mg vitamin C tablet weighed 1.627 g. A student crushed thetablet and transferred 0.159 g of the crushed powder into a 100 mLvolumetric flask, dissolved the powder in...
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