Chemistry question and answers for September 22, 2023
- Q 1. When a solid dissolves in water, heat may be evolved orabsorbed. The heat of dissolution (dissolving) can be determinedusing a coffee cup calorimeter. In the laboratory a generalchemistry student...
- Q Determine the concentrations of Pb2 and Br– in a saturatedsolution of PbBr2 in:a) pure water (assume μ = 0).b) a solution with an ionic strength of 0.010.c) a solution with...
- Q A liquid ink is yellow and placed in a cuvette, colored opticalfilters are placed infront of the LED light and the light hits theink cuvette. The intensity of the fluorescence...
- Q Predict the kind various of copolymer and polymerizationmechanism of depending on the reactivityNitro ethylene and propylene
- Q cisplatin(or cis- diamminedichloroplatinum(II) is an anticancerdrug. The trans isomer, however has no effect. how does cisplatinfuntion to kill tumors?
- Q Given the DOSY nmr spectrum the mixture of Glucose, Maltose, andDextran 70 with solvents are DMSO and CDCl3. Can anyone show me howto plot and determine the linear trend between...
- Q The reaction N2O(g) + O2(g) NO2(g) +NO(g) has ΔHº = -42.9 kJ andΔSº = -26.1 J/K. Suppose 0.400 mol of N2O and 0.400 of O2 areplaced in a 8.00 L...
- Q Consider four possible liquid fuels used in vehicles.• C8H18 Octane - gasoline• C12H26 Dodecane - diesel• CH3OH ethanol - gasoline additive• CH3NO2 nitromethane - racing fuelDetermine the heat released upon...
- Q The decomposition of N2O to N2 and O2 is a first-order reaction.At 730° C the half-life of the reaction is 3.58 × 103 min. If theinitial pressure of N2O is...
- Q A rock is 4.2% by mass fayalite (Fe2SiO4), 8.4% by massforsterite (Mg2SiO4), and the remainder silicon dioxide. What isthe mass percent of each element in the rock?_% Fe_% Mg_% Si_%...
- Q A 30.00 mL sample of 0.0100M MgEDTA2- solution wasadded to a 30.00 mL sample containing Fe3+. The solutionwas then buffered to pH 10 and titrated with 12.83 mL of 0.0152...
- Q A student obtained the following data for the gas phasedecomposition of nitrosyl chloride at 400 K. NOCl(g)NO(g) + ½Cl2(g) [NOCl], M 8.40×10-2 4.20×10-2 2.10×10-2 1.05×10-2 seconds 02.78×104 8.33×104 1.94×105 (1)...
- Q Calculate the percent ionization of formic acid solutions havingthe following concentrations.a) 1.20Mb)0.450Mc)0.130Md)5.10 x 10^-2
- Q What volume of 0.115 M HClO4 solution is needed to neutralize41.00mL of 9.00
- Q Given: A 70.0 mL solution of 0.191 M ammonia is titrated with0.191 M HCl. The pKa for ammonium is 9.3.Question:The titration is basically figuring out what is in the breakerand...
- Q A beaker with 2.00×102 mL of an acetic acid bufferwith a pH of 5.000 is sitting on a benchtop. The total molarity ofacid and conjugate base in this buffer is...
- Q State if each of the following salts is acidic, basic, orneutral. Briefly, give your reason for each choice.BaI2, LiBr, NH4Br,CH3NH3CN, andCa3(PO4)2Is there some kind of trick or way to find...
- Q A sample of a chromium-containing alloy weighing 3.450 g wasdissolved in acid, and all the chromium in the sample was oxidizedto 2CrO42–. It was then found that 3.18 g of...
- Q HA 25PART B: The following reaction was performed in a sealed vesselat 712 ∘C: H2(g)+I2(g)⇌2HI(g)Initially, only H2 and I2 were present at concentrations of[H2]=3.55M and [I2]=2.30M . The equilibriumconcentration of...
- Q For Tc-98, Tc-97, and Tc-96 what are the following for each?Atomic SymbolNameNumber of ProtonsNumber of electronsMass NumberNumber of NeutronsMass of isotopesPercent of abundance
- Q What are reactions similar to or used in Fischer IndoleSynthesis?
- Q 1. A 33.6 mL sample of a 0.494M aqueous acetic acid solution is titrated with a0.379 M aqueous sodium hydroxidesolution. What is the pH after 14.8 mL of basehave been...
- Q 3.04 g of Al react with 7.42g of I2. to form AlI3. How manygrams of of AlI3are produced? which one is the limited reactant? Al+3Ia to Al2I3. Please show work
- Q Question #1.) A fixed volume of gas at constant temperature hasa volume of 45.6 L at 1.24 atm. Use Boyle's Law to calculate:a. the volume of the gas when compressed...
- Q Calculate the change in pH when 7.00 mL of 0.100 M HCl(aq) isadded to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq)and 0.100 M in NH4Cl(aq).Calculate...
- Q The 1H NMR of ethanol in CDCl3 will consist of three signals inthe spectra: a triplet at 1.25 ppm, a quartet at 3.72 ppm, and abroad singlet at 1.32 ppm....
- Q 4. Give the general arrangement of the subatomic particles in anatom.
- Q NaBr heated in Na vapor produced nonstoichiometric compounds;i.e., the atomic ratios are not whole numbers. The additionaluptake of Na atoms occurs by the reaction: Na -> Na++ e-, where the...
- Q You have 225 mL of an 0.43 M acetic acid solution. What volume(V) of 1.10 M NaOH solution must you add in order to prepare anacetate buffer of pH =...
- Q Suppose that you are given the task of determining theSCN- content of a blood sample by forming theFe(SCN)2+ complex and measuring the absorbance. Youbegin by taking a 10.00-mL volume of...
- Q 3. (a) Using x, y, z vectors of each atom in aSO2molecule to derive the reducible representation(assuming that the principle axis is collinear with the z axis andthe molecule is...
- Q A gas has a volume of 4.00 L at 0 degree Celsius. what finaltemperature, in degrees Celsius, is needed to change the volume ofthe gas to each of the following,...
- Q A beaker with 145 mLmL of an acetic acid buffer with a pHpH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q 1. Given the chemical reaction:3C(graphite) + 4H2(g) =C3H8(g)Calculate the ΔHrxn using Hess’s Law and thefollowing information:C3H8(g) + 5O2(g) =3CO2(g) + 4H2O(l);   ΔH = -2220 kJ/molC(graphite) + O2(g) = CO2(g);  ΔH...
- Q How many mL (to the nearest mL) of 0.225-M KF solution should beadded to 370. mL of 0.246-M HF to prepare a pH = 3.90 solution?Please show work, thank you...
- Q A mixture contains 4 proteins with native molecular weights of:120kDa, 100kDa, 25kDa, 15kDa is applied on a size exclusionchromatography column. The fractional range is 30-90kDa, the bedvolume is 31mL, and...
- Q Use ?G?f values from Appendix IIB to calculate theequilibrium constants at 25 ?C for each of the followingreactions.a. 2NO2(g)?N2O4(g)b. 3/2H2(g)+1/4P4(g)?PH3(g)
- Q Thallium (Tl) is a heavy element used in the electronicindustry. The reduction reaction for Tl is Tl+ + e- ® Tl and itsexchange current is j0 = 103´[Tl+]1/2 A/m2 when...
- Q forthe molecule with the main corresponding intermolecular forceCH4 and H20CH4Ch2=OCH3-OHNa and NH3NAOH
- Q An 18.0 g ice cube initially at -10 Celsius is dropped into 120gof water initiallly at 25 Celsius. What is the final temperature ofthe system after all of the ice...
- Q Make a list of the anions of the six strong monoprotic acidsdiscussed in lecture. These anions are said to have no effect onthe pH of an aqueous solution. The same...
- Q For the compounds present, list all intermolecular forcespresent and then rank the compounds in order of increasing boilingpoint (lowest to highest). Hint: draw the structures to make thiseasier.Ethane (C2H6)Ethanol (C2H5OH)Acetic...
- Q For the diprotic weak acid H2A, Ka1 = 3.1 × 10-6 and Ka2 = 5.4 ×10-9. What is the pH of a 0.0650 M solution of H2A? What are theequilibrium...
- Q pH of Aqueous Sulfuric Acid Calculate the pH of a 2.07×10-3 Msolution of H2SO4. (Ka = 0.0120 for HSO4-)
- Q What is the probability of finding the particle in the regiona/4 < x < a/2? show your work.
- Q For molecule NF3-a) draw a full MO diagram. All F 2pz LGO are non-bonding. The 2sorbitals are to far from 2p to interact. The e LGO derived from F2px and...
- Q what are the steps (initiation, propogation, termination) for theradical chlorination of butane?
- Q At 1 atm, how much energy in kJ is required to heat 85.0 g H 2 O( s ) at − 10.0 ∘ C to H 2 O ( g...
- Q The equilibrium constant in terms of pressures, Kp, for thereaction NH3(g) + HF(g) NH4F(s) at 25 °C is 10.2. (a) If thepartial pressure of ammonia is PNH3 = 0.553 atm...
- Q ttt(ss)[A][A](MM)ln[A]lnâ¡[A]1/[A]1/[A]0.000.500−−0.6932.0020.00.389−−0.9442.5740.00.303−−1.193.3060.00.236−−1.444.2480.00.184−−1.695.43a.) What is the order of this reaction?012b.) What is the value of the rate constant for thisreaction?Express your answer to three significant figures and include theappropriate units.
- Q Consider the titration of a 22.0 −mL sample of 0.105 M HC2H3O2with 0.130 M NaOH. What is the pH after adding 4.00 mL of basebeyond the equivalence point?
- Q 2)A 25.0 mL sample of 0.160 M KOH is titrated with 0.250 MHCl.Determine the following quantities:a)The initial pH of the KOH solution before any acid is added.b)The pH of the...
- Q Foreach of the circumstances described below, discuss how it mightaffect the calculated % yield and briefly explain whya. A student does not filter the solution before proceeding toreaction with H2SO4b....
- Q 1. How many grams of Kr are in a 9.76 L cylinder at 75.6 ∘C and9.27 atm?mass: ? g2. If 2.44 g Ar are added to 2.38 atm He in...
- Q 3) The emission spetrum from stars can be used to determinetheir temperature ( they are blackbody emitters). our sun has atemperature of 5800 k.a) use the wavelenght maximum equation to...
- Q 1.A 25.0 L solution is made of 0.10 M acid and 0.13 M conjugatebase. What mass of HNO3 (MM = 63.01) in grams can thebuffer absorb before one of the...
- Q All academic manuscripts (journal articles, communications,etc.) have an introduction as a way to introduce the reader to thescientific problem that the paper addresses and describe thepurpose of the experiment and...
- Q Garnet typically has the chemical formula: (Fe2+, Mg2+, Ca 2+,Mn2+)3 Al3+2Si4+3O12The formula can be broken up into structural sites (spaces wherecations of a certain size range can occupy) X3Y2Z3O12 where...
- Q When ethanol, C2H5OH (a component in some gasoline mixtures) isburned in air, one molecule of ethanol combines with three oxygenmolecules to form two CO2 molecules and three H2O molecules.a)Â Â Â Â Â Draw two...
- Q You are given 10.00mL of a solution of an unknown acid. The pHof this solution is exactly 5.62. You determine that theconcentration of the unknown acid was 0.1224 M. You...
- Q Consider the unbalanced reaction between silvernitrate and sodium chromate:AgNO3(aq) + Na2CrO4(aq) →Ag2CrO4(s) + NaNO3(aq)Using the information from above, determine the concentration ofthe nitrate ions left in solution after thereaction is...
- Q The elements radium and astatine both arise during theradioactive decay of uranium. They get together in the form of thesalt RaAt2; the radius of the Ra2+ ion is 162 pm...
- Q A lead-acid battery uses a redox reaction in which lead(0) andlead(IV) are both converted to lead(II). This reaction isfacilitated by the presence of sulfuric acid, H2SO4, as shown bythe reactionPb+PbO2+2H2SO4→2PbSO4+2H2OSuppose...
- Q What other organic compounds do you encounter in your everydaylife that have a 1) positive effect and 2) negative effect. Explainin great detail how these organic compounds affect yourlifestyle.
- Q A student carried out the experiment \"Ways to ExpressConcentration\" and obtained the following data expressed in thetable.used solute and molar mass: NaCl (58.44 g / mol)volume and concentration aqueous solution...
- Q Double checking if the answer is EWhich of the following has the particles ordered correctly fromsmallest to largest radius?A. Ca < K < Mg < Mg2+B. Mg < Mg2+ <...
- Q Describe the hybridization around the carbon atoms in acetylene(include the diagram of the orbital overlaps showing various bondtypes, sigma and pi).
- Q Reaction conditions and product isolation…a)What is the purpose of using Silica Gel in this Fischeresterification reaction? Explain.b) The crude reaction product did not still contain a largeexcess of acetic acid...
- Q Which 1H NMR peaks will be key for discriminating (E)-stilbenefrom mesostilbene dibromide?
- Q A weak acid, (HA), has an acid dissociation constant of4.60∙10–6. A 25.00 ml sample with a concentration of 0.1200 M istitrated with 0.1500 M NaOH. F. How many ml NaOH...
- Q (3) A student accidentally uses toluene totriturate their crude product instead of methanol. Moments afterheating, their crude product dissolves completely.Explain why the result was undesirable, drawing comparisonsbetween recrystallization and trituration.Propose...
- Q TrialPrecise volume of Ca(OH)2 solutionEquivalence point Volume of HCl (mL)114 mL11 mL1.Calculate the OH- in the saturatedCa(OH)2 sol. from the results of this titration2.Calculate the Ca2+3. Calculate the Ksp for...
- Q 1.        When solidcalcium carbonate reacts with hydrochloric acid, three productsresult.a) Write the balanced equation to represent this reaction.b) How many grams of calciumcarbonate will fully react with 75.0 mL of...
- Q When 22.0 mL of a 5.10×10-4 M potassium hydroxide solution iscombined with 12.0 mL of a 8.93×10-4 M magnesium nitrate solutiondoes a precipitate form? (yes or no) For these conditions,...
- Q In muscle tissue, the ratio of phosphorylase a tophosphorylase b determines the rate of conversion ofglycogen to glucose 1‑phosphate.Classify how each event affects the rate of glycogen breakdownin isolated muscle...
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!