Chemistry question and answers for August 03, 2023
- Q The arsenic in a 1.27 g sample of a pesticide was converted toAsO3−4 by suitable chemical treatment. It was then titrated usingAg+ to form Ag3AsO4 as a precipitate.A- What is...
- Q Does the Carboxylic acid of tyrosine get deprotonated by NaH? Ifso, why is it not alkylated by the alkyl halide? Comment onnucleophilic strength, and again use structures to explain youranswer...
- Q A hydrogen electron in the ground state absorbs a 92.3157 nmphoton to reach a higher excited state (a), and then emits twophotons, one with 1.75777 x 10^-20 J of energy...
- Q Polonium crystallizes with a simple cubic structure. It has adensity of 9.3 g/cm^3 , a radius of 167 pm, and a molar mass of 209g/mol .Estimate Avogadro's number (the number...
- Q what makes the noble gases \"noble\"?
- Q What is the pH of a 0.250 M NaOCl solution? Kb = 3.4 x 10-7
- Q Use the half reaction method to balance each of the followingoxidation-reduction reactions. Identify the oxidizing agent and thereducing agent.A) Cu(s) + Ag+(aq) ---> Ag(s) + Cu2+B) Al(s) + I2(s) --->...
- Q Many transuranium elements, such as plutonium-232, havevery short half-lives. (For 232Pu, the half-life is 36minutes.)However, some, like protactinium-231 (half-life 5 3.34 3104 years), have relatively long half-lives. calculate the changein...
- Q Select two salts that dissolve in water to give a solution withpH <7.A. CaF2B. CH3 NH3 ClC. CrCl3D. Sr(ClO4 ) 2E. NaNO2F. KNO3
- Q -- I can calculate the formula mass but getconfused with the various conversions between different types ofunits. I have the correct answers but I am trying to learn how towork...
- Q TYPED RESPONSE ONLY WITH AT LEAST 1REFERENCE:List four factors that can shift the position of an equilibrium.Only one of these factors can alter the value of the equilibriumconstant. Which one...
- Q Part AA beaker with 195 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer...
- Q 1. A student prepares a 250.0 mL solution using 41.7 grams ofpotassium nitrite. They then take 29.9 mL of this solution anddilute it to a final volume of 250.0 mL....
- Q Here we have a Radioactive Thermoelectric Generator (RTG) thatis powered by Plutonium 238 (238Pu). The RTG produces1400 Watts. 238Pu decays by alpha-particle emission. Thealpha-particle has 5.593 MeV of kinetic energy....
- Q Explain the spectral differences between the spinach and theCordyline fruticose leaves.What determines the leaf color in plants? Provide a structureand of the molecule and explain why green is the predominantcolor.Why...
- Q Sodium fluoride and lead nitrate are both soluble in water. If0.0946 g of NaF and 0.362 g of Pb(NO3)2aredissolved in sufficient water to make 1.50 L of solution, will aprecipitate...
- Q 1) You are a research scientist studying a novel enzymeX, and you want to characterize this new enzyme. You measure thevelocity of the reaction with different substrate concentrationsand get the...
- Q In a constant-pressure calorimeter, 60.0 mL of 0.310 M Ba(OH)2was added to 60.0 mL of 0.620 M HCl. The reaction caused thetemperature of the solution to rise from 22.61 °C...
- Q What is the percent dissociation of 1 L of 0.1000 M acetatebuffer at pH 4.76 after the addition of 77.76 mL of 0.3201 M HClO4?
- Q 1a )When 50.0 mL of 0.500 M HCl at 25.0°C is added to 50.0 mL of0.500 M NaOH at 25.0°C in a coffee cup calorimeter, the temperatureof the mixture rises...
- Q Can you have TSS without turbidity? Can you have turbiditywithout TSS? Explain why based on the physics of themeasurement.
- Q Calcium nitrate and ammonium flouride react to form calciumflouride, dinitrogen monoxide, and water vapor. What mass of eachsubstance is present after 21.83g of calcium nitrate and 22.75g ofammonium flouride react...
- Q find the ph of each mixture of acids0.020m HNO3 and 0.225 Mbr0.095m in acetic acid and 0.075.m in H2SO40.0500 M in HCL04 and 0.02 M HBR
- Q Write the total differential for H as a function of T & Pand derive the appropriate working equation.
- Q 1.  Discuss the process of water boiling from themolecular point of view. Your explanation should include the effectof atmospheric pressure and the effect of adding a non-volatilesolute to the water.2. Compare...
- Q Chemical Pairs: sodium chloride versus sodium chlorite bariumsulfate versus barium sulfide sodium nitrate versus sodium nitritesodium hypochlorite versus sodium perchlorate Questions: What aresome of the common uses for each of...
- Q A 2.20 g sample of the Ethane C2H6 gas was mixed with excessoxygen gas and a combustion reaction occurred to obtain water inliquid aggregate and carbon dioxide state. The combustion...
- Q Many radioactive isotopes are used in medicine for imaging andtreatment purposes. The specific isotopes used depends on theparticular organ or body system being studied (for example, Xe-133is used to image...
- Q A-- 1.25 cubic inch (in3) sample of glycerol has a mass of 25.2grams. What is the mass of a 57-mL sample of glycerol?b---The pressure of the earth's atmosphere at sea...
- Q Find an appropriate buffer system (include the weak acid/base andconjugate base/acid salt) to make 1.0 M buffer at pH 7.3.
- Q Discuss Dalton’s theory. What are all of the postulates? Withrecent discoveries about the nature of an atom, does it still applytoday?
- Q TheKsp for PbCl2= 1.7x10^-5Calculate the molar solubility of PbCl2 in a solution that is0.1 M of the soluble salt MgCl2
- Q Describe what is meant by an electrical double layer (EDL) thatoccurs at the interface between an electrode and the solution
- Q PLEASE SHOW ME YOUR STEPS!!Consider the following unbalanced redox equations: a. I
- Q 1)Let’s say that you recovered 80%trimyristin (after recrystallization, so the final product) fromthe 2 g of nutmeg you initially started with.a- If you completed the hydrolysis reaction (see lab) to...
- Q what other techniques are similar to proteincrystallization?
- Q 2.15 mol of an ideal gas with CV,m=3R/2undergoes the transformations described in the following list froman initial state described by T=350.K andP=5.00bar.1) The gas undergoes a reversible adiabatic expansion until...
- Q How is the operon activated in E.coli that grow onlactose?
- Q A 1.00-g sample of piperazine hexahydrate is dissolved in enoughwater to produce 100.0 mL of solution and is titrated with 0.500M HCl.A.) What is the initial pH of the solution,...
- Q Describe electronegativity and relate it to the bonds watermakes.
- Q Ammonia (NH3) boils at -33.4 oC. It has anenthalpy of vaporization of 23.35 kJ/mol. The liquid has a specificheat of 80.8 J/mol oC, and the gas has a specific heatof...
- Q Some commercial drain cleaners contain a mixture of sodiumhydroxide and aluminum powder. When the mixture is poured down aclogged drain, the following reaction occurs:2NaOH(aq) + 2Al(s) + 6H2O(l) →2NaAl(OH)4(aq) +...
- Q A gaseous mixture contains 421.0 Torr of H2(g), 392.9 Torr ofN2(g), and 68.1 Torr of Ar(g). Calculate the mole fraction, X, ofeach of these gases.
- Q What volume (to the nearest 0.1 mL) of 5.20-M NaOH must be addedto 0.500 L of 0.350-M HNO2 to prepare a pH = 3.50buffer?
- Q Match each term to the correct definition.A. Chemical separationB. Gravity filtrationC. Physical separationD. Vacuum filtrationE. EvaporationF. Heterogeneous mixtureG. Homogenous mixtureH. DistillationI. ExtractionJ. Decantation-varies in composition, distinct clumps of each component...
- Q What conditions must be true about a weak acid solution in orderto use the Hendersonâ€Hasselbalch equation to find solution pH andin what region of a titration curve do these conditions...
- Q (a) A vessel is separated into two parts, A and B, by a bilayerlipid membrane containing Na+ channels. Part A holds an aqueoussolution of NaCl with concentration 0.15 mol L-1...
- Q make an energy level diagram (electronic transitions) ofcompound Fluorescein
- Q you want to purify 10g of a compound A that has been contaminatedwith 0.20g of compound B. solubilities in water of the twocompounds are given.compound A - solubility at 20°c=...
- Q Using a 0.25 M phosphate buffer with a pH of 7.6, youadd 0.75 mL of 0.45 M NaOH to 59 mL of the buffer. What isthe new pH of the...
- Q The generic metal A forms an insoluble salt AB(s) and a complexAC5(aq). The equilibrium concentrations in a solution of AC5 werefound to be [A] = 0.100 M, [C] = 0.0340...
- Q 1.What are the key operating features of the following types ofmass spec instruments and what are the advantages and benefits ifany associated with each type. (Include quadrupole, triplequadrupole mass spec,...
- Q Choose all the true statements.-Liquid water has a lower entropy than liquid benzene at 25°Cbecause of hydrogen bonding in water.-Entropy is the main driving force in the formation of the...
- Q An unknown mass of each of the following substances, initiallyat 21.0 ∘C, absorbs 1930 J of heat. The final temperature isrecorded as indicated. Find the mass of each substance.1) Pyrex...
- Q Five moles of TiCl4 are combined with two moles ofTi.a) How many moles of TiCl3 are produced according to thefollowing reaction?3TiCl4 + Ti = 4TiCl3I know the answer for A...
- Q : A suspension of colloids at room temperature(25°C) contains CaS04 in (a) 3 mM and (b) 30 mMconcentration. Find the Debye length (in nm) for both the cases.Use relevant data...
- Q Caproic acid is composed of C, H, and O atoms. The combustion ofa 0.225g sample yields 0.512g of CO2 and 0.209g of H2O. What is theempirical formula for the compound?
- Q 19. A. Solid calcium nitrate is slowly added to175 mL of a 0.0676 Mpotassium carbonate solution. The concentration ofcalcium ion required to just initiateprecipitation is _____ M.B. Solid zinc acetate...
- Q Calculate the [H+], [OH-], pH, pOH for theresulting solution if 20.00 mL sample of 0.2650 M NaOH wastitrated with 21.33 mL of 0.1175 MH2SO4.
- Q 16. Does the reaction Cu2+ + Mg (s)→   Cu (s) + Mg2+ occur spontaneously inaqueous solution?           A.    yes                     B.   no17. Does the reaction 2 Al3+ + 3 Pb (s)→   2 Al (s) +...
- Q The following rate data was collected for a reaction X + Y ->Products    Exp.          [X]                       [Y]              Rate of formation of a product    1              0.23M               0.17M                 0.33M/h    2              0.46M               0.17M                   0.66 M/h    3             0.23M              0.51M                   0.99 M/h           a. Determine...
- Q 1). Two 20.0 mL samples, one 0.200 MKOH and the other 0.200 MCH3NH2, were titrated with 0.100 MHI. Answer each of the followingquestions regarding these two titrations.a). What is the...
- Q What is the systematic name of [Os(NH3)2(en)2]Cl3,[Co(NH3)3(en)Cl]NO3, and (NH4)2[Fe(EDTA)]?
- Q Find the pH during titration of 20.00ml of 0.1000 Mtriethylamine, (CH3CH2)3N (Kb=5.210^-4), with 0.1000M HCL solutionafter the following additions of titrants a) 10.00mL b) 20.70 mL c)27.00 mL
- Q 12.      What is responsible forcapillary action, a property of liquids?a)        surfacetensionb)        cohesiveforcesc)        adhesiveforcesd)        viscositye)        two ofthese32. Which of the following correctly states the relationshipbetween temperature and the solubility of a...
- Q interrelationship between global warming, acid rain, ozone layerdepletion, and photochemical smog? Â
- Q Determine the vapor pressure of a solution at 55°C that contains34.2 g NaCl in 375 mL of water. The vapor pressure of pure water at55°C is 118.1 torr. The van't...
- Q A 1.00 L flask is filled with 1.45 g of argon at 25 ∘C. A sampleof ethane vapor is added to the same flask until the total pressureis 1.450 atm...
- Q Mass- 83gVolume before candle was burnt - 1000 mLVolume after candle was burnt - 964.2mLAtmospheric pressure - 1.09 atmTemperature - 296 Kelvins1) Using the ideal gas law, calculate the number...
- Q calculate the pH for a strong acid + strong base titration inwhich 5.00 mL of the M(OH)2 was transferred via pipet toa beaker and HCl was added from the buret.Concentration...
- Q 1.Calculate the number of moles of solute present in am aqueoussolution of 86.3 g of 0.160 m KCl.2. The density of toluene (C7H8) is 0.867g/mL, and the densityof thiophene (C4H4S)...
- Q Problem 5: Find the differential and total cross sections in theï¬rst Born approximation for elastic scattering of a particle ofmass m, which is initially traveling along the z-axis, from anonspherical,...
- Q If acidic H2O2 is mixed with Fe^2+, which reaction occurs: theoxidation of Fe^2+ to Fe^3+ or the reduction of Fe^2+ to Fe? Givethe balanced redox reaction for each possibility and...
- Q Imagine that you are in chemistry lab and need to make 1.00 L ofa solution with a pH of 2.50. You have in front of you100 mL of 6.00×10−2 M...
- Q 7. You are given 2.263 g of a mixture of KClO3 and KCl. Whenheated, the KClO3 decomposes to KCl and O2, 2 KClO3 (s) → 2 KCl (s)+ 3 O2...
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!