Chemistry question and answers for August 20, 2023
- Q youadd 1 ml of 0.1M HCl to a solution containing 10ml of 0.2M aceticacid (Ka = 1.8x10-5) and 10ml of 0.2 M sodium acetate. What is theresulting pH?
- Q Predictthe sign of the entropy change for each of the following processesand give your reasoning why:1.Solid sugar is added to water to form a solution.2.Iodine vapor condenses on a cold...
- Q A student reaceted 50.0 ml of 1.05 N sodium hydroxide with 50.0ml of 1.00 N sulfuric acid in a coffee cup calorimeter. From thetemperature vs time plot, the average Ti...
- Q You are quantitating benzene using isopropyl-benzene as aninternal standard. During the first run, you add 100.0 microlitersof 500. microgram/mL benzene and 100.0 microliters of 500.microgram/mL isopropylbenzene to a vial and...
- Q Calculate the pH of a 0.0760 M anilinium chloride solution. Alist of ionization constants can be found here.Calculate the concentrations of the conjugate acid and base atequilibrium. The conjugate acid...
- Q Calculate Δ G ∘ rxn for the following reaction: 4CO(g)+2N O 2(g)→4C O 2 (g)+ N 2 (g) . Use the following reactions and given Δ G∘ rxn values: 2NO(g)+...
- Q calculate the thermodynamic favorability of aerobic Mn(II)oxidation and aerobic Fe(II) oxidation at pH 2 and 7? Would anorganism grow from these processes?Show all work and don't use previous answers similar...
- Q Which of the following statements is true?Fast reactions have small rate constants.Slow reactions have large rate constants.A rate equation contains concentration terms for all reactantsinvolved in a one-step mechanism.A rate...
- Q The 9 species are to be separated based on their differences involatility, primarily using distillation columns.(benzene,p-xylene,toluene, ethylene, cumene, hydrogen, methane , ethane, propane ,propyl) rank the species from most volatile...
- Q A 25.0 mL sample of a 0.3400 M solution of aqueoustrimethylamine is titrated with a 0.4250 M solution ofHCl. Calculate the pH of the solution after 10.0, 20.0, and 30.0...
- Q You have an unknown dye solution whose concentration seems tolie between 0.0006M stock solution and a 0.0004 stock solution.Therefore, you had planned to dilute the 0.0006M stock to createyour calibration...
- Q For the following reaction, 10.1 grams of propane (C3H8) areallowed to react with 20.6 grams of oxygen gas . propane (C3H8)(g)+ oxygen(g) carbon dioxide(g) + water(g) What is the maximum...
- Q Determine the volume (in mL) of 0.411 M hydrochloric acid (HCl)that must be added to 448 mL of 0.914 M sodium butanoate(NaC3H7COO) to yield a pH of 5.48. Assume the...
- Q 2. Calculate the theoretical yield (g) of Zybanhydrochloride3. Write out the mechanism for the a-bromination of 1(m-chloropropiophenone).4. Step 2 is a substitution of bromine by t-butylamine. Whattype of substitution is...
- Q . During the preparation of your dish(chocolate pudding,pasta, bread), the chemical composition of each ingredient plays arole in the texture, aroma and appearance of the final product. Usethe table below...
- Q Which Relative Risk (RR) and confidence interval (CI) is mostlikely to be a causal relationship?A) RR= 3.0 (95% CI 1.9-7.9)B) RR= 3.0 (95% CI 0.3-12.2)C) RR= 1.0 (95% CI 0.3-12.2)D)...
- Q A)assuming volumes are additive, what volume of water must be addedto 28.0 mL of 1.25 M FeCl3 to prepare a 0.650 M FeCl3solution?B) what mass of Ca(OH)2 would be required...
- Q Youcarry out some kinetics experiments and discover that the rateconstant for protein binding to random DNA sequence is 2.7-foldfaster than for binding the binding site. What is the ratio oftheir...
- Q Identify the single most acidic or basic principle species ineach of the following solutions. Calculate its molarity or numberof moles (your choice). In the case of any species other than...
- Q Part 1: Calculate the solubility (in M) of cobalt(II)hydroxide, Co(OH)2(s) in H2O. Ksp = 2.80×10-16 ata specific temperaturePart 2; What is the pH of this solution of cobalt(II)hydroxide?
- Q Ifyou want a solution to maintain a pH= 7.9 which would be a betterchoice for the buffer pKa = 8.07 or acetic acid pKa = 4.8?
- Q At 200°C, Kc​ = 1.6*10−10 for: N2​O(g) + NO2(g) ⇌ 3 NO(g). If350 mL of NO measured at 797 torr and 25.0°C is placed into a 3.00L container, what will...
- Q \"In a decomposition process, 2.40 g of impure CaCO3 (CaCO3 mixedwith other substances that remain as residue) was decomposed athigh temperature and a total pressure of 960.0 torr.2.00 L CO2...
- Q Use hand drawn pictures to describe your understanding ofcolligative properties of solutions at the particulate level. Youshould use each molecule drawn to represent 0.01 mol of thatsubstance. You should be...
- Q Read the following statement carefully and then answer thequestions that follow.The equilibrium constant (Kp) for the reaction of solid carbonwith carbon dioxide producing carbon monoxide at 850 ºC, has avalue...
- Q How much heat does it take to convert 0.500 kg of ice at-20oC to steam at 250.oC?Heat capacities: ice, 2.1 J g-1oC; liquid4.2 J g-1 oC-1; steam 2.0g-1 oC-1Heat of...
- Q Name five additives, besides flour, yeast, water, sugar andsalt, found on a label of a loaf of bread. State the function ofthese additives
- Q The enthalpy change for a chemical reaction is the sum of theenergy consumed in breaking bonds and the energy released duringbond formation. One way to determine the overall energy change...
- Q Hyperthyroidism is a condition that occurs when the thyroidsecretes an excess of hormones, leading to an increase in themetabolic rate of all the cells in the body. Hyperthyroidismincreases the demand...
- Q Which of the following properties of a molecular compound canlargely be explained by its intermolecular forces? Select as manyas are applicable .Select one or more:a) Vapor pressureb) Covalent bond strengthsc)...
- Q Write the formulas and provide the associated name for eachformula for the four acids that contain oxyanions of bromine.
- Q Calculate [OH−] for each solution.A. pH = 2.52B. pH = 8.09C. pH = 13.58
- Q Fe(III) forms a complex with thiocyanate, Fe(SCN)2+,that has a molar absorptivity of 7.00 x 103 at 580 nm. A5.00 ml aliquot of a solution that contains 47.4 ppmFe3+ is reacted...
- Q Weight of Unknown #4( in g)Volume of water (in mL)Unknown #4 solution (in g/L)0.11850.002.360.12750.002.540.11250.002.24Volume of NaOH used = Final concentration – Initialconcentration                                        = 16.49 mL – 4.90 mL = 11.49mL...
- Q The very useful restriction enzyme SpoBob hydrolyses thephosphodiester bond between the guanylates in the sequence AGGACCA.Is SpoBob generating blunt or sticky ends? Please explain.
- Q Research and then claim an application where solar or nuclearpower is used. (Please try to keep the numbers even in that if yousee mostly solar power applications selected, then go...
- Q In time of flight mass spectrometers, ion separation is achievedusing a(n)….. and why?A. Field Free Drift TubeB. RF only collision cellC. Combination high-pass and low-pass filterD. Magnetic Field
- Q In the Introduction to Equilibrium experiment, what kind oferrors would occur? (need to write discussion)
- Q For each of the reactions, calculate the mass (in grams) of theproduct formed when 3.75 g of the underlined reactant completelyreacts. Assume that there is more than enough of the...
- Q AP CHEM question! Can you please follow these steps foreach: 1.) net ionic equation, 2.) ice table, 3.) pH= pKa + log(CB/WA)A 35.0 mL sample of 0.150 M acetic acid...
- Q When electricity (the flow of electrons) is passed through asolution, it causes an oxidation-reduction (redox) reaction tooccur. If the solution contains a metal cation such as Ag+, theflow of electrons...
- Q *Please show how you got the calculations.In a reactor scenario, 20.000 g Fe3O4 was reacted, at 1450 K,with NO having an initial pressure of 3.000 atm. At equilibrium,the mass of...
- Q Acetic acid and its conjugate base acetate can form an acid-basebuffer. The pKa of acetic acid is 4.75. How much 10.0 M HNO3 mustbe added to 1.00 L of a...
- Q How does the Fluoride Ion-Selective Electrode it detect thefluoride ion? Include the species of fluoride that need to beconsidered, how to free the fluoride ion, and pHconsiderations.
- Q What do you mean by pro-R and pro-S?
- Q the Santa Ana winds are strong within SouthernCalifornia. what drives this phenomenon?(use thermodynamic quantities/concepts to explain)Physical chemistry question
- Q For which of the following reactions is ?H?rxn equal to ?H?f ofthe product(s)?You do not need to look up any values to answer this question.Check all that apply.SO(g)+12O2(g)?SO2(g)2Na(s)+F2(g)?2NaF(s)Na(s)+12F2(g)?NaF(s)S(s)+O2(g)?SO2(g)Na(s)+12F2(l)?NaF(s)SO3(g)?12O2(g)+SO2(g)
- Q 1. What is the coordination number for each of the followingcomplexes?[Co(NH3)4Cl2]+[Mg(EDTA)]2?[Zn(H2O)4]2+Na[Au(CN)2]Enter the coordination numbers, in the order that the complexesare listed, as four integers separated by commas (e.g.,1,2,3,4).2. What is...
- Q Ionization is removal of an electron from the ground state[lowest possible value of n] completely from the atom. Calculatethe energy required to ionize a hydrogen like atom (in kJ/mol).
- Q Magnesium reacts with N2 and O2 to form MgO Mg3N2. calculate themass of nitrides and oxides, which are obtainable by reacting oneliter of air at 296 K and 749 mmHg,...
- Q Capsaicin is the compound that makes hot peppers spicy. Thiscompound reversibly binds to the same protein that detects heat inour bodies. For that reason, when we eat spicy food we...
- Q Describe the influences and forces driving the formation of thelipid bilayer. Brieflydiscuss the effect of a phase transition on a lipid bilayer.
- Q 1)Info:a)Consider the equilibrium:Ag (NH3)2^+ + Cl^- <------> AgCl + 2NH3b) Based on the stoichiometry of the reaction, whichof the conditions constitutes an excess of NH3 over Cl-? (3:1 or30:1)Â Â Â Â Both...
- Q A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+half-cell at 25 ∘C. The initial concentrations of Pb2+ and Cu2+ are5.20×10−2M and 1.50 M,respectively.A) What is the cell potential...
- Q What is the pH of 0.41 MH3PO4? The Ka values forphosphoric acid are Ka1 = 7.5×10-3, Ka2 =6.2×10-8, and Ka3 = 3.6×10-13.
- Q A. Calculate the density of sulfur hexafluoride gas at 706 torrand 20 ?C.B. Calculate the molar mass of a vapor that has a density of7.130 g/L at 13 ?C and...
- Q The reaction is: Mg(s) + 2HCl(aq) --> MgCl2 (aq) + H2(g)1. If 2.016 g of hydrogen (H2) was released, how many moles ofmagnesium reacted? How many grams of magnesium would...
- Q What type of stabilizing interaction could there be between theside chains of glutamate and lysine? Please explain why as well.-Salt bridges-Hydrophobic interactions-Hydrogen bonds
- Q In the simple distillation of a mixture of toluene andcyclohexane, the average highest temperature recorded was in 95degrees Celsius. Explain why in the fractional distillation of thesame mixture, the average...
- Q 12.a) Consider a sample of hemoglobin molecules all bound to carbonmonoxide CO. What conformation would be favored? What would theHill plot of that sample look like?b Consider a sample of...
- Q 8. Describe an electrospray ionization source and themechanisms involved for thegeneration of gas-phase ions. How does this compare to a DESIsource for massspectrometry?
- Q The molality of an aqueous sodium nitrate solution is 2.81 m.What is the mole fraction of NaNO3? The molar mass of NaNO3 is85.00 g/mol; the molar mass of water is...
- Q Calculate the enthalpy of reaction for the following reactionusing Hess's Law and the equations provided below.Target Reaction: Sr(s)+C(graphite)+1 1/2 O2(g) ----->SrCO3(s) H(degrees)=?C(Graphite)+ O2(g)-----> CO2(g)H(degrees)= -349kJSr(s)+ 1/2 O2(G)-------> SrO(s) H(degrees)=-592kJSrO(s)+CO2(g)-------> SrCo3(s)H(degrees)=...
- Q 1. A sample of methane gas that occupies a volumeof 12.8 L at a temperature of 0 °C and a pressureof 1 atm contains ________ moles of gas.2. A mixture...
- Q Match the correct term with the description:Terms: Metal ion indicator, acid-base indicator, auxiliarycomplexing agent, direct, back,displacement, indirect, and masking agent.Titration where anions that precipitate with metal ions can bemeasured. ___________Titration...
- Q if you had used a calorimeter that was not insulated as well,how would your results be affected? what about a calorimeter thatwas more insulted?
- Q sodium bicarbonate 10 g sodium carbonate 12.72 g, add-50 ml ofdeionized water to the beaker and stir until all of the weak acidor weak base has dissolved. Carefully and slowly...
- Q Ammonia, NH3, and oxygen can be reacted together in the presenceof a catalyst to form only nitrogen monoxide and water. The numberof moles of oxygen consumed for every 9.00 moles...
- Q Describe in your own words how any two types of the followingtypes of chromatography work: adsorption, partition, ion exchange,molecular exclusion, or affinity.
- Q Werecertainionstypicallyalwayssolubleoralwaysinsoluble?Howcouldyoutell?Includespecificexamples.
- Q Preparation of a buffer:Dissolve in a beaker 27.3 g NaC2H3O2·3H2O in water containing 60 mLof 1 M HCl (you need to make a 250- mL of 1 M hydrochloric acidsolution...
- Q If 25.0 mL of a 0.238M FeO4^2- solution is allowed to react with55.0 mL of 1.47 M aqueous ammonia, what volume of nitrogen gas canform at 25°C and 1.50 atm?Volume...
- Q a. what is the difference between a flourescenceexcitation spectrum and a fluorescence emission spectrum?. whichresembles an absorption spectrum.b. consider a molecule that can fluoresce from the s1state and phosphoresce from...
- Q Describe the major properties, methods of analysis, and clinicaluse of:AFPCA-125CEABeta-hCGPSA
- Q What volume, in liters, of O2 measured at 760 torr and 25o C isneeded to completely react with 18.47 g of iron to give Fe2O3?
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