Chemistry question and answers for September 21, 2023
- Q You Receive a 1.5 mL vial of a 12.5 kDa protein that has aconcentration of 1.45 mM. When you test its OD280 in a 1cm cuvette,it is 8.434.How much total...
- Q 1). A solution contains 0.0490 M Ca2+ and 0.0980 MAg+. If solid Na3PO4 is added tothis mixture, which of the phosphate species would precipitate outof solution first? (which one?)(a). Ca3(PO4)2(b)....
- Q Classify each of the following reactions as one of these fourtypes: • spontaneous at all temperatures • not spontaneous at anytemperature • spontaneous below a certain temperature but not above•...
- Q If the density of water is 1g/mL and the density of a 0.16 M HClsolution is 1.023 g/mL, how do I use this information to determinethe mass of both water...
- Q What is your opinion about:1 Releasing the results of a research to the public isconsidered a good practice. Different views (or criticism) maybring valuable insight to the researchers and perhaps...
- Q Explain the fundamental basis of molecular orbital theory.
- Q In the following reaction what mass of Ba(NO3)2 can be formed bycombining 55.0g BaCO3 and 55.0g HNO3? BaCO3+2HNO3=Ba(NO3)2+CO2+H2O
- Q Hess's Law:Calculate ΔH for the neutralizationof HCl(aq) byNaOH(s). I'M NOTSURE WHAT DATA YOU NEED, SO I COPY AND PASTED ALL OF MYDATA.A. ΔHsolution of NaOH(s) PhaseChange:Mass of NaOH: 2.05 gΔT...
- Q 8. What is the molar fraction of benzene in a solution made bymixing 10 g of benzene (Molecular Weight 78.11) and 10 g of toluene(Molecular Weight 92.14)? Show two significant...
- Q Acetylsalicylic acid,C9H7O2COOH, has a pKa =3.480. A solution was prepared by dissolving 6.20 g ofacetylsalicylic acid in 1.000 L of solution. Â Â mw =180.16 g/mol.A. Calculate the pH using thequadratic and...
- Q How many moles of Al2O3 is produced from 0.32 mol Al and 0.26mole O2? How many moles of Al2O3 are formed from the reaction of6.38 grams of O2 and 9.15...
- Q 1 a. A buffer solution is prepared by placing 5.86 grams ofsodium nitrite and 32.6 mL of a 4.90 M nitrous acid solution into a500.0 mL volumetric flask and diluting...
- Q What pathways control glycogen metabolism?Please explain fully, show diagrams if needed
- Q Classify each of the following reactions as one of these fourtypes:• spontaneous at all temperatures• not spontaneous at any temperature• spontaneous below a certain temperature but not above• spontaneous above...
- Q Under anaerobic conditions, glucose is broken down in muscletissues to form lactic acid according to the reaction, C6H12O6(s) →2CH3CHOCOOH(s). Thermodynamic data for glucose and lactic acid at298 K are given...
- Q 1. What is the theoretical yield of aspirin when reacting 3.08 gof salicylic acid with an excess of acetic anhydride? Report youranswer to 3 significant figures.2. If you prepare 3.45...
- Q Sketch two 3d-orbital energy-level diagrams for the transitionmetal ion in [MCl6]4- when elongation andcompression along the z axis take place, respectively. In thediagrams, label the names of the d orbitals,...
- Q In a hydrogenic atom, s- and p-type orbitals of the same shellare degenerate. Explain why the 2s and 2porbitals would not be degenerate in a carbon atom, and justifytheir relative...
- Q Advance oil chemistry, answer in brief and correct otherwiseleave!What are the major solid effluents come from oil industries.
- Q Summarize the different of type of indicator electrodes, theirdefinition, characteristics and applications
- Q ________________ compounds are made up of non-metals only.
- Q 1- In the titration between potassium iodate and the sodiumthiosulfate solution, if the titration is not performed immediatelyafter the addition of the sulfuric acid, how would this likelyaffect the calculated...
- Q At what temperature will a molecule of UF6 have the same averagespeed as a molecule of hydrogen at 37 degrees celsius?
- Q Consider a titration of 0.15M NaOH and 250 mL of 0.10M HBr.What is the pH of the HBr solution before any base isadded?What is the pH after 50 mL NaOH...
- Q FOR QUESTION 5-7):Solve the problemscompletely5) 1.60 g of an unknownmolecular substance is dissolved in 20.0 g of benzene. The freezingpoint of pure benzene is 5.5oC, and the freezing pointof the...
- Q Part A.) Phosgene (carbonyl chloride), COCl2, is an extremelytoxic gas that is used in manufacturing certain dyes and plastics.Phosgene can be produced by reacting carbon monoxide and chlorinegas at high...
- Q Air is 21.0% by volume oxygen molecules and C3H8 produces CO2and H2O on combustion. What volume of air at 1.00 bar and 20.0 °Cwould be required to burn 38.8 Kg...
- Q When a 22.0 mL sample of a 0.448 M aqueous hydrocyanic acidsolution is titrated with a 0.387 M aqueous barium hydroxidesolution, what is the pH after 19.1 mL of barium...
- Q Order these chemical species by increasing pH of an 0.1M aqueoussolution of each. That is, imagine making an 0.1M solution of eachspecies. Select 1 next to the species that makes...
- Q 1)Which of the following compounds exhibits optical isomerism?Which of the following compounds exhibits optical isomerism?CH3-CHBr-CH3CH3-CH2-CHF-CH3CH3-CH2-CH3CH3-CH2-CH2FCH3-CH2-CBr2-CH32)Based on the molecular formula, determine whether each compoundis an alkane, alkene, or alkyne. (Assume that...
- Q Write equations for the reactionof each substance in oxygen if a reaction occurs:1. Adding glowing orange wooden splint to oxygen and itrelighting.2. Adding glowing orange steel wool to oxygen and...
- Q Dimethylhydrazine is a carbon-hydrogen-nitrogen compound used inrocket fuels. When burned completely, a 0.312 g sample yields 0.458g CO2 and 0.374 g H2O. What is the empirical formula ofdiemthylhydrazine?
- Q In the following reaction:HCO3-(aq) +NH3(aq) ↔CO32-(aq) +NH4+(aq)Select one:a. NH3 is an acid andHCO32- is its conjugatebase.b. NH3 is an acid andNH4+ is its conjugatebase.c. HCO3- is an acid andCO32- is...
- Q Classify each of the following substances as a nonelectrolyte, weakelectrolyteor strong electrolyte in waterH2SO3KClO2NH3NaClCH3OH
- Q Write the dissociation reaction for the following acids inwater. Use the appropriate arrow symbols. Label the acid, base ,conjugate acid and conjugate base for each:HCl(hydrochloic acid)C6H6COOH (benzoic acid)
- Q What is the pH at the equivalence point in the titration of a23.0 mL sample of a 0.304 Maqueous hydrocyanic acid solution with a0.433 M aqueous sodium hydroxidesolution?pH =A 30.6...
- Q A 1 liter solution contains 0.436 Mhypochlorous acid and 0.581 Msodium hypochlorite.Addition of 0.109 moles of bariumhydroxide will:(Assume that the volume does not change upon the addition ofbarium hydroxide.)Raise the...
- Q How many grams of NaOH (MW = 40.0) are there in 500.0 mL of a0.175 M NaOH solution?
- Q Consider the transfer of methane from benzene to water. Whattemperature would be needed to make this process spontaneous? Alsodiscuss the implications of this when considering hydrophobicinteractions.
- Q 1. While synthesizing aspirin, a student masses out 3.4898 gsalicylic acid.A) What is the theoretical yield of aspirin the student canmake? (the molar mass of salicylic acid is 138.12 g/mol...
- Q Which of the following aqueous solutions are good buffersystems?0.13 M calcium hydroxide +0.25 M calcium bromide0.27 M ammonia +0.32 M potassium hydroxide0.39 M sodium chloride +0.28 M barium chloride0.28 M...
- Q Alkyl bromides react with sodium iodine (Nal) to yield alkyliodides by a reaction that is a biomolecular nucleophillicsubstitution. Which compound will react faster: tert-butyl bromideor methyl bromide?
- Q Discuss capillary (zone) electrophoresis, micellarelectrokinetic chromatography (MEKC) and capillaryelectrochromatography. Describe similarities and differences inworking principle, injection, and separation. Discuss advantagesand disadvantages of each of these techniques. Which compoundswould you separate...
- Q 1)Describe IN POINT FORM what happens when you raise thepressure of a sample of water from 0.004 atm to 40 atm at aconstant temperature of 100 degrees celcius.  2)Describe IN POINT...
- Q From the data below, calculate the total heat (in J) needed toconvert 0.535 mol of gaseous ethanol at 300.0°C and 1 atm to liquidethanol at 25.0°C and 1 atm:b.p. at...
- Q 6. What is the silver ion concentration in a solution preparedby mixing 389 mL of 0.391 M silver nitrate with 441 mL of 0.487 Msodium phosphate? The Ksp of silver...
- Q Consider the combustion reaction of hydrocarbon.CH + O2 -----> CO2 + H20a. Write out the equilibrium expression for in terms of partialpressures?b. In which direction will the reaction shift if...
- Q Calculate the atomic percent of tungsten in an alloy preparedwith 56 grams of tungsten and 48 grams of aluminum. The atomic massof tungsten is 183.85 g/mol and aluminum is 26.98...
- Q 1. Calculate [H3O+] in the following aqueous solution at 25 C:[OH−]=1.1×10−9 M.2. Calculate [H3O+] in the following aqueous solution at 25 C:[OH−]=2.4×10−2 M .3. Calculate [H3O+] in the following aqueous...
- Q We used FTIR-ATR to determine vinyl acetate from a glue stickusing the internal standards method. We used the standards with 12,18, 25, and 40% poly(ethylene-co-vinyl acetate). The peak height at1020...
- Q which solvent is the best for the analysis of a mixture offerrocene and acetylferrocene? explain your reasoning
- Q 1. At 1 atm, how much energy is required to heat 91.0 g ofH2O(s) at –24.0 °C to H2O(g) at 171.0 °C?2.When 1518 J of heat energy is added to...
- Q Silver iodide is a very insoluble compound. Please give reasonsfor compounds like silver sulfate or silver chloride to beinsoluble that relate to ionic radius.
- Q Define the following terms anddraw one example of each using organic molecules:Van der Waal's non-polar interactions, Dipolar interactions,Hydrogen Bonding.What is the function of the silica gel in TLC experiment?We used...
- Q Buffer AssignmentpHÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â concentration(M)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â mL7.8Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1.0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100.00Eq) Buffer=Stotal/LWhere Stotal=moles (A) + moles (B)Ptotal=mol (H2PO4-)+mol (HPO42-)PH=pKa + log (moles B/molesA)Determine the Mass of Each ComponentRecall that buffers are formed from conjugate acid/base pairs.Using the information given...
- Q 1. A person is considered medically to have lead poisoning ifthey have a concentration of greater than 5.2 μg (micrograms) oflead per deciliter of blood. What is the concentration in...
- 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)....
- Q I want to know the whole C5H10 structures that can beformed (chain, ring...etc) including streoidimers. Thanks.
- Q Find the identity of a solid, weak acid, HY. The followinginformation is obtained a) Write the dissociation equation for HYin water and its equilibrium expression (Ka). b) A sample of...
- Q what's the effect of change in mobile phase flow rate inHPLCand the effect of change of injection volume in HPLC?
- Q GRIGNARD REACTION:Precise mass (in grams) of the bromobenzene used:.21gPrecise mass (in grams) of the magnesium used:.054gPrecise mass (in grams) of the benzophenone used:.350gPrecise mass (in grams) of the product:.011gWhat is...
- Q For my chemistry final, we're identifying 5 unknowns, one acid,one base, one chloride salt, one nitrate salt, and one sodium salt. On the list of possible unknowns, there are:three acids...
- Q Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning thatone molecule of the acid has three acidic protons. Estimate the pH,and the concentrations of all species in a 0.500 M phosphoric...
- Q You have 500.0 mL of a buffer solution containing 0.20M acetic acid and 0.30 M sodium acetate. Whatwill the pH of the solution be after the addition of 20.0 mL...
- Q For a monochromator with a 0.540 meter focal length equippedwith a 2200 gr/mm grating that measures 100m x 100m(a) Calculate first order reciprocal linear dispersion(b) A substance has two emission...
- Q 7. (8%) How to dispense one liter of 3 M HCl solution if youhave a bottle of HCl that you find in the chemical stores? Thebottle contains the following information:...
- Q Would we expect that the co-polymer produced by anionicpolymerization of butadiene and styrene to be easily cross-linked?Yes or No and please explain why
- Q Cyclohexane has a freezing point of 6.50 ∘C and a Kf of 20.0∘C/m. What is the freezing point of a solution made by dissolving0.771 g of biphenyl (C12H10) in 25.0...
- Q The half-life of cesium-137, released as a result of theFukushima Daiichi nuclear disaster, is 30.2 years. Determine thenumber of years it would take for the amount of cesium-137 todecrease to...
- Q How much of each of the solutions is needed to make the buffer?Final volume is 10 mL.stock solutions1 M HEPES (pH 7.9)5 M NaCl1 M BME100 mM EDTA750 mM MgCl250%...
- Q A. What is the ? (alpha)- helical dipole and what is themolecular origin of that dipole?B. Identify two amino acids that are preferred in ? (beta)-sheets. Why might these amino...
- Q A 50.0 mL solution of 0.199 M KOH is titrated with 0.398 M HCl.Calculate the pH of the solution after the addition of thefollowing amounts of HCl.a) 0.00 mL HClb)...
- Q Consider the following reaction at 298 K: 4Al(s) + 3O2(g) ==>2Al2O3(s)Delta H= -3351.4 kJ/molCalculate:a. Delta Ssystem = _______J/mol*Kb. Delta Ssurroundings = _______J/mol*Kc. Delta S universe = _________J/mol*K
- Q Two moles of nitrogen gas at 25°C, confined within a cylinder bya piston maintaining a constant pressure of 1 atm, is heated with5.30 kJ of energy. Assume all the energy...
- Q Two amino acids are either not a standard alpha- amino acid orin the S configuration. Whichresidues are they, and how are they different? Illustrate yourreasoning with chemicalstructures
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