Chemistry question and answers for July 29, 2023
- Q If the Xe atom can accomodate a maximum of 14 electrons in itsexpanded valence shell, what is the formal charge on the Xe atom inthe most significant contributor to the...
- Q The following data show the rate constant of a reaction measuredat several different temperatures. Temperature (K) at 310 has arate constant (1/s) of 4.65×10^−2 . Temperature (K) at 320 has...
- Q A chemist adds 225.0 mL of a 8.0x10-5 mmol/L solutionof silver (II) oxide solution to a reaction flask. Calculate themass of micrograms in silver (II) oxide the chemist has added...
- Q 1. What happens when a strong acid suchas HBr dissolves inwater?2. What is the PH of a solution with [H+] of 3.6*10^-4?3. A sample of urine has a pH 7.9....
- Q Colorimetry:-Definition-Principle-Theories-Instrument used-Advantages-Disadvantages
- Q Label blood types O and A with the correct monosaccharides. Thedefining monosaccharide is noted by the gray and orange bond. Eachmonosaccharide may be used more than once. Note: If any...
- Q Be sure to answer all parts.Calculate E o , E, and ΔG for the following cell reactions:(a) Mg(s) + Sn2+(aq) ⇌ Mg2+(aq) + Sn(s) where [Mg2+] = 0.045 Mand [Sn2+]...
- Q Draw a dash-wedge structure for(2S,3R)-3-bromo-6,6-dimethylocta-7-en-2-ol. Draw a dash-wedgestructure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne.
- Q (a) What are the disadvantages of using too little drying agent?(b) What are the disadvantages of using too much drying agent?
- Q A new energy drink on the market is widely marketed as“caffeine-freeâ€. Basedon the nature of complaints filed by several consumers, itappears that the “caffeine-free†claim might actually be fraudulent. You...
- Q In the Debye-Huckel equation describing the true activity ofions in solution, name and describe 6 terms contained therein thataffect the activity, and explain how they do affect it.
- Q Design a separation scheme to separate cations, Al3+, Cu2+,Ni2+, Ag+.
- Q 1. Write the acid dissociation reaction for following solutions,and calculate the pH for each of them: a) 0.001 M HCl b) 0.005 MH2SO4 c) 0.005 M KOH
- Q describe the sources non essential amino acids in human organism.(for each non essential amino acid...please more explanation)
- Q 1.In gravimetric analysis, it ispossible to use the common-ion effect to favor the production ofsolid precipitate. In this problem you will test this approach tosee how effective it is for...
- Q A student makes a solution containing ammonium chloride andammonium bromide salts dissolved in concentrated sulfuric acid. Sheadds a portion of tert-butyl alcohol and shakes the mixturevigorously. After allowing the layers...
- Q In a FRET experiment, the donor GFP (GFP absorbs at 487 nm,emits at 510 nm) is attached to protein A, and the acceptor YFP(YFP absorbs at 514 nm, emits at...
- Q Calculate pCa2+ for the titration of 25.00 mL of 0.0200 M EDTAwith 12.0 mL of 0.01000 M CaSO4 at pH 10.00.
- Q Calculate the pH of a titration with 25 mL of 0.1 M NH3 with 0.1MHCl at the following volume points: 0, 10, 24.9, 25, 25.1, 40,50mL
- Q A Carnot cycle uses 1.00 mol of a monoatomic perfect gas as theworking substance from an initial state of 10.0 atm and 600 K. Itexpands isothermally to a pressure of...
- Q 1.  A solution of 0.05M KMnO4 was titratedwith a solution of 0.268g Na2C2O4100mL. What is the volume of KMnO4 required to the endpoint?2.  Calculate the %C2O42- in each of the...
- Q In theory, what could be done experimentally to change the valueof A (frequency factor in Arrhenius equation)? Explain the effectin molecular terms.
- Q how does the flouride-ion selective electrode detect theflouride ion?
- Q The 12 green principles concern safety for people and theenvironment; would it be greener to use a bunsen burner or a hotplate?
- Q c. For this reaction in heart muscle, ΔG°’ = +4.7 kJ/mol but ΔG= -0.6 kJ/mol. i. Explain, in words, how ΔG can be negative whenΔG°’ is positive. ii. What would...
- Q Determine the percent ionization of the following solutions ofphenol at 25 degrees Celsius.a) 0.681 Mb) 0.250 Mc) 1.68 x 10-6 M (enter answer in scientificnotation)
- Q 1.(15):DefinePartition functionEquipartition principleHow the energy of a system can be gotten from the partitionfunction.Quantum mechanical tunnelingContinuous function
- Q The activation energy for a particular reaction is 84 kJ/mol. Bywhat factor will the rate constant increase when the temperature isincreased from 50 oC to 72 oC?
- Q Canyou please write a written detailed procedure for the twoexperiments:1- qualitative analysis of cation group 12- qualitative analysis of cation group 2
- Q Calculate the concentration of all species present in a 0.01 Maqueous solution of ammonia. The pKa of the ammonium ion is9.24.A.)Calculate [H+] (express the result in molar unitsusing three significant...
- Q 1. View the side groups in the model, with attention to thewater channel. What do the numerous aromatic rings on the surfaceof the channel suggest about the chemical properties of...
- Q Here's the measurements from my expirement.(reaction 1)0.502 g Cu (s)4.0 mL HNO3100 mL DI water(reaction 2)30 mL 3.0 M NAOH(reaction 3)nothing was added.(reaction 4)200 mL of DI water15 mL of...
- Q Given 100.0 ml of a buffer that is 0.50 M in HOCl and 0.40 M inNaOCl, what is the pH after 10.0 ml of 1.0 M NaOH has beenadded?(Ka for...
- Q In an acid-base titration experiment, 50 mL of a 0.05 M solutionof acetic acid (Ka = 1.75 x 10-5 ) was titrated with a 0.05Msolution of NaOH at 25 oC....
- Q The values of specific gravity are:Standard Sugar Solution # 1= 1.014Standard Sugar Solution # 2= 1.028Standard Sugar Solution # 3= 1.042Show your calculations below.3. Plot data points of the 3...
- Q The objective of this experiment is to identify real worldapplications of quantum mechanics. Write a paper with a minimum of1200 words discussing real world applications of quantum mechanics.Do NOT copy...
- Q A 10 g object at 50oC is placed in 100 g water at39.8oC in a calorimeter. The temperature of the waterand the object equilibrated at 40.0oC. Identify themetal.Please explain this....
- Q 100 moles/hour of pure ethane at 25 degrees Celsius and 1.0 atmare burned with 50.0% excess air producing a desired product ofcarbon dioxide and an undesired product of carbon monoxide....
- Q Sulfuryl chloride,SO2Cl2,a compound with very irritating vapors,is used as a reagent in the synthesis of organic compounds. Whenheated to a sufficiently high temperature it decomposes. Given:SO2Cl2 (g) ï„ SO2 (g)...
- Q Given the following reactions:COBr2 (g) --------------- > CO (g) +Br2(g)             K = .190 at 73 °C2 BrCl (g) ------------ > Br2 (g) + Cl2(g)         K = 310at 73 °C (estimated)Find the...
- Q A 10 g ice cube at 0oC is melted in 100 g waterinitially at 20oC. The equilibrium temperature of themixture is 10.93oC.Calculate:a) The heat lost by the water.b) The heat...
- Q 1. For the following reaction, 6.25 grams of sulfur dioxideare mixed with excess water . The reaction yields 7.21 grams ofsulfurous acid (H2SO3) .sulfur dioxide ( g ) + water...
- 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+ are5.00×10−2 M and 1.50 M , respectivelyWhat is the...
- Q Solve an equilibrium problem (using an ICE table) to calculatethe pH of each solution:Part A) 0.15M HFPart B) 0.15M NaFPart C) a mixture that is 0.15M in HF and 0.15M...
- Q Determine the amount of heat produced if 100.00 grams of Cystein(C3H7NO2S) was burned in excess oxygen to produce carbon dioxide,water, and nitrogen gas. Include the molecular formula and balancedchemical equation...
- Q Distillation is a technique that is to purify liquid compounds.Explain how distillation is used to separate the target productfrom any residual unreacted starting material.    [2.0 Marks]Upon completion of the reaction (before...
- Q A weak acid was HA (pKa=5.00) was titrated with 1.00M KOH. Theacid solution had a volume of 100ml and a molarity of 0.100M. Findthe pH at the following volumes of...
- Q Liquid octane (CH3(CH2)6CH3) will react with gasous oxygen (O2)to produce gasous carbon dioxide (CO2) and gasous water (H2O).What is the theoretical yield of water formed from the reactionof 88.0 g...
- Q Given the formula equation, write the complete ionic equation,net ionic equation, and identify the spectator ions for thefollowing reaction: (NH4)2SO4 (aq) + 2 NaOH (aq) —> Na2SO4 (aq)+ 2 H2O...
- Q A sample of carbonic acid (0.125 L, 0.199 M, pKa1 =6.35, pKa2 = 10.33) was titrated with 1.75 M NaOH.Calculate the pH at the following points:Before the titration.At the 1st...
- Q 30 grams of steam at 130C are colled to the boiling point,condensed, then cooled to 0C and frozen into ice. What is the totalchange in entropy of the water? what...
- Q Read the description and choose the term that matches from theoptions in the list.A proteinaceous biological catalyst is an:A compound that is only extractable from biological materialwith a non polar...
- Q it appears more and more ceramic and metal objects are beingreplaced nowadays. These include : 1) household materials (someceramic bath tubs or floors are replaced with polymer materials )2) metal...
- Q Predict if the following reactions are spontaneous (e.g. usingthe Z method) and calculate E0,DG0 and K for each reactionReduction of H+ by Zn(s) (to form H2 andZn2+)Oxidation of Cu by...
- Q What is branching in chemistry?
- Q A 25.0 mL aqueous solution contains 500.0 mg of a compound.Calculate the amount of solid extracted by diethyl ether from thesolution by each of the following extraction procedures (assume adistribution...
- Q The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 =7.38. Calculate the pH at each of the following points in thetitration of 50.0 mL of...
- Q Find the pH of the following solution10.0mL of solution A (which is .15 of .5M of acetic acid and .15of .5M of sodium acetate) and 10.0mL of 0.1M of HNO310.0mL...
- Q What is the pressure (in millimeters of mercury) inside acontainer of gas connected to a mercury-filled open-end manometerof the sort shown in Figure 9.4 in the textbook when the level...
- Q You are interested in determining the heat of isomerization oftwo isomers (A and B), so you measure their heats of combustion.The difference between the heats of combustion is equal to...
- Q find the pH of a 40 mL buffer solution + 1.0 mL of 6.0M HCl (aq)I know this question is pretty simple, but do I needto know what the buffer...
- Q Perhaps the most central concept in amino acid degradation isthat some amino acids are glucogenic, some are ketogenic and someare both glucogenic and ketogenic. Which of the following aminoacids is...
- Q How many milliliters of 0.120 M NaOH are required totritrate 50.0 mL of 0.0998 M hydrochloric acid to the equivalepoint the Ka of hypochlorous acid is 3.0×10^-8. What is the...
- Q Devise a synthesis of 5-methyl-1-hexyne usingone of the starting materials and any of the reagents below usingthe fewest steps possible. If you need fewer than the 3 stepsallowed, enter \"none\"...
- Q a) A buffer contains significant amounts of hydrofluoric (HF)and sodium fluoride (NaF). Write the net ionic equation showing howthis buffer neutralizes added HNO3. Express your answer as achemical equation. Identify...
- Q A sample of 7.5 L of NH3 gas at 22 ∘C and 735 torr is bubbledinto a 0.50-L solution of 0.40 M HCl. Assuming that all the NH3dissolves and that...
- Q when 1.0 mol of NO(g) forms from its elements, 90.29 kJ of heatis absorbed. How much heat is evolved when 5.40 g of NO decomposesto its elements?
- Q An aqueous solution of ethyl acetate at room temperature has anitial concentration of 0.15 M. Calculate the equilibriumconcentrations of ethyl acetate (CH3COOC2H5), ethanol (C2H5OH) andacetic acid if the equilibrium constant...
- Q Yeast make alcohol in the absence of oxygen by a process calledfermentation (i.e., anaerobic respiration). Complete fermentationof one of the sugar glucose (C6 H12O6) will generate two moles of ethanol...
- Q 1 Define the term “distillation.â€2 Write an equation to exemplify Dalton’sLaw.3 Maximum boiling azeotropes differ from minimum boilingazeotropes in what significant way?4 Define the term “reflux.â€5 Draw a sketch of...
- Q Effective nuclear charge is:A-the amount of attraction between electrons of two differentatoms.B-the amount of attraction that an electron \"feels\" for thenucleus.C-a nuclear explosion that effects global warming.D-the difference between the...
- Q What is the pH of a 5.4× 10–8 M solution of HCl(aq) at 25 °C?Report your answer to the hundredths place.
- Q Acetone, the solvent in many nail polish removers, has a densityof 0.791 g/mL. What is the volume, in mL, of 38.2 g of acetone?Anautomobile gasoline tank holds 31.0 gal when...
- Q Write unbalanced half-reactions for the following net ionicequations.Part A MnO4−(aq)+IO3−(aq)→MnO2(s)+IO4−(aq) Express your answersas chemical expressions separated by a comma. Enter the reductionhalf-reaction first. Identify all of the phases in your...
- Q A beaker with 2.00×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
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