Chemistry question and answers for July 13, 2023
- Q A local furniture manufacturing plant contacted you (anindustrial hygienist) to assist with an OSHA compliance matter.Describe how you would go about determining if the plant mustcomply with the OSHA formaldehyde...
- Q Calculate the pH of the resulting solution if 26.0 mL of 0.260 MHCl(aq) is added to (a) 36.0 mL of 0.260 M NaOH(aq).(b) 16.0 mL of0.360 M NaOH(aq).
- Q A student is asked to standardize a solution ofpotassium hydroxide. He weighs out0.965 g potassium hydrogen phthalate(KHC8H4O4, treat this as amonoprotic acid).It requires 25.9 mL of potassiumhydroxide to reach the...
- Q 3A. Using Table 11-3, Common Indicators, predict the color ofThymol Blue (note that there are 2 transition ranges for thisindicator) at the following solution pH’s:pH = 1.00 color__________pH = 3.00...
- Q Mg standardAbsorbance%RSD0.50.095330.310.12090.220.173040.350.281370.2100.569010.5200.871530.35 mL Unk0.142960.2[1] Make a calibration curve using the absorbances for thesamples from 0.5 – 20 ppm. Include the intercept (0,0) as a datapoint.[2] Is the calibration linear, i.e.,...
- Q 2. Consider the titration of 25.00 mL of 0.300 M H3 PO4 with0.300 M NaOH.2A. Write the net ionic equation for the reaction of phosphoricacid with NaOH to form sodium...
- Q After diluting 30 ml of 0.100M NH4OH(Kb=1.75x10-5) to100 ml, the solution is titrated with 0.100 M HCl. Calculate the pHvalue of the solution: a) at the start of the titration...
- Q Hi! I'm doing a lab report on the synthesis of divanillin fromvanillin and h202 using horseradish peroxidase type 1 enzyme. I'mwondering what the steps are in the reaction (drawing), and...
- Q 500.0 mL of 0.150 M NaOH is added to 605 mL of 0.200 M weak acid(Ka = 5.15 × 10-5). What is the pH of the resulting buffer?
- Q A. 4.00×10−3 mol of HBr are dissolved in water to make 17.0 L ofsolution. What is the concentration of hydroxide ions, [OH−], inthis solution?B.8.00 g of NaOH are dissolved in...
- Q Chromium and oxygen combine to form chromium (III) oxide.4Cr(s)+3O2(g)→2Cr2O3(s)How many moles of O2 react with 4.85 mol of Cr?How many grams of Cr2O3 are produced when 23.6 g of Crreacts?When...
- Q problem 7.77for each of the following reactions 34.0 g of each reactant ispresent initially2Al(s)+3Cl2(g)-->2AlCl3(s)A) calculate the grams of product in parentheses that would beproduced(AlCl3)
- Q High-pressure oxidationIn an oxidation system, increasing the gas pressure increasesthe parabolic reaction rate (by increasing Ns). Ofcourse, the furnace become more complicated because the tube mustsealed up in order to...
- Q At the AQWA facility in Hillarys, patrons view the marine lifewhile walking through a tunnel formed by a semi-cylinder glasswall. The aquarium contains sea water (Specific Gravity 1.025), andthe highest...
- Q Orange and grapefruits are known as citrus fruits because theiracidity comes mainly from citric acid, H3C6O7. Calculate theconcentration of citric acid in a solution if a 30.0 Ml sample iscompletely...
- Q Classify each of the following reactions as one of the fourpossible types summarized in Table 19.3: (i) spontanous at alltemperatures; (ii) not spontaneous at any temperature; (iii)spontaneous at low T...
- Q for each of the following likely the brands ofindicated product when 22.0 gram of the first reactant and 39.5when will the second reactant is useda) 2SO2(g)+O2(g)--> 2SO3(g)(SO3)B) 3fe(s)+4H2O(l)-->Fe3O4(s)+4H2(g)(Fe3O4)c) C7H16(g)+11O2(g)-->7CO2(g)+8H2O(g)(H2O)
- Q A solution is made by mixing 0.150 M NH4Cl and 0.100M NH3. Ka for NH4+ is 5.61x10-10(please show math)a. What type of solution you will have when the two compoundsare...
- Q A) how many moles of c are present in 0.719 moles ofBenadryl formula C17H21NOB) how many moles of H are present in 1.65 moles of Benadrylformula c17h21noC) moles of n...
- Q A solution contains 0.0442 mol of ethanol and 0.715 mol of waterat 25 oC. The vapor pressures of pure ethanol and pure water at 25oC are 44.6 torr and 23.8...
- Q Buffer capacity is a measure of a buffer solution's resistanceto changes in pH as strong acid or base is added. Suppose that youhave 175 mL of a buffer that is...
- Q 1) Calculate the change in pH when 3.00ml of .1M HCl(aq) isadded to 100 ml of a buffer solution that is .1 M in NH3(aq) and.1M in NH4Cl(aq)2)Calculate the change...
- Q What is the example of chemical system ( please the exampleshould not be biochemistry) I need just brief statement for theexample.
- Q 19. a. For the titration of 50.00 mL of 0.0500 M Fe2+ with0.1000 M Ce4+ in the presence of 1 M H2SO4, please calculate thesystem potential after 2.25 mL of...
- Q In an Organic Chemistry Lab entitled: Natural Product Isolation:Isolation of Eugenol from Oil of Clovesa.) What would happen if the NaOH solution was replaced withdeionized water inthe first step of...
- Q Steam distillation lab?One can prepare homemade lavender perfume by steamdistillation,one of the maincomponents in the lavender oil is linalyl acetare (MM 196 g/mol),which has a vapor pressure of 20 mm...
- Q . The equilibrium constant for the reaction below is 7.796 x10-9. Calculate the equilibrium concentrations of allspecies if the initial Co3+ concentration is 0.425 M andthe initial SO42- concentration is...
- Q Considering dilution, calculate the initial concentrations usedfor each trial. (It asks for [I-] and [S2O8 2-].)Trial 1:Water-3.00mL0.10M KI-0.25mL0.10M KCl-0.75mL0.05M K2SO4-0.75mL0.05M K2SO8-0.25mL0.10M CuSO4-0mL
- Q 3. Find the pH of…A) 0.0055 M HBrB) 5.00 ml of LiOH after it is diluted to 500 mlC) 2.00 M sodium benzoate (Kb = 1.5 x 10 -10)E) Identify...
- Q Consider the formation of hydrogen fluoride: H2(g) + F2(g) ↔2HF(g) If a 1.8 L nickel reaction container (glass cannot be usedbecause it reacts with HF) filled with 0.0098 M H2...
- Q A solution is made by mixing exactly 500 mL of 0.149 M NaOH withexactly 500 mL of 0.100 M CH3COOH. Calculate the equilibriumconcentration of the species below. Ka of CH3COOH...
- Q For 220.0 mL of a buffer solution that is 0.3028 M inCH3CH2NH2 and 0.2783 M inCH3CH2NH3Cl, calculate the initialpH and the final pH after adding 0.0100 mol ofNaOH(Kb=5.6⋅10−4).
- Q In a closed 1.00 L flask, 4.30 atm of CO reacts with 2.50 atm ofO2 according to the equation below. Assuming that the temperatureremains constant, what is the final pressure...
- Q A mixture of benzene and toluene is in equilibrium with itsvapor at 50oC. What mole fraction of benzene is in the vapor phase?You may assume that this system follows Raoult's...
- Q In order to better understand one of the most important buffersystems in our body (the carbonic acid buffer system), you aretitrating 0.100 L of 0.100 M carbonic acid (shown below)...
- Q You are titrating 0.100 L of 0.100 M carbonic acid (shown below)with 0.500 M NaOH.What will the pH be when 23.0 mL of NaOH have been added? pkas:6.05 and 10.64
- Q Why is it better to use a volatile solvent for the mobile phaseof Thin Layer Chromatography
- Q Calculate the work done in joules when 1.50 mol of watervaporizes at 2.00 atm and 100oC, assuming that thevolume of the water is negligible compared with that of the steamformed.
- Q Consider the following equilibrium: CO2(g) + H2(g)---CO(g) +H2O(g); Kc = 1.6 at 1260 K Suppose 0.038 mol CO2 and 0.022 mol H2are placed in a 1.50-L vessel at 1260 K....
- Q Kerosene, a common space-heater fuel, is a mixture ofhydrocarbons whose average formula isC12H26.(a) Determine the balanced equation, using the simplestwhole-number coefficients, for the complete combustion of keroseneto gases. Include physical...
- Q The enthalpy of combustion of octane is 5074.9 kJ/mol and itsdensity is 703 kg/m3 . On a mild winter day a room of volume 40 m3needs to be warmed up...
- Q Q1. Assume the solubility product ofMg(OH)2 is 2.2 ×10−11 at a certain temperature. Whatminimum OH− concentration must beattained (for example, by adding NaOH) to decrease theMg2+concentration in a solution ofMg(NO3)2...
- Q A buffer that contains 1.05 M base, B, and 0.700 M of itsconjugate acid, BH+, has a pH of 9.900. What is the pH after 0.0055mol of HCL is added...
- Q when a certain compound was heated in a test tube, itchanged from red to blue and water formed on the colder parts ofthe test tube. solutions of both the original...
- Q A 0.4809 g sample of pewter, containing tin, lead, copper, andzinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O andremoved by filtration. The resulting filtrate and washings werediluted to...
- Q An unknown amount of acid can often be determined by adding anexcess of base and then \"back-titrating\" the excess. A 0.3471 gsample of a mixture of oxalic acid, which has...
- Q Based on thermodynamics, why is a saturated fat a solid at roomtemperature and why does it have a higher melting point than anunsaturated fat?
- Q In the laboratory, a general chemistry student measured the pHof a 0.552 M aqueous solution of hydrofluoric acid to be 1.685. Usethe information she obtained to determine the Ka for...
- Q For PbCl2 (Ksp 2.4 x 10-4),will a precipitate of PbCl2 form when 0.10 L of 3.0 x10-2 M Pb(NO3)2 is added to 400 mlof 9.0 x 10-2 M NaCl?Please show,...
- Q The solubility of copper (ii) oxalate is 3.2 x 10-3g/L. What is the solubilty product constant for copper (ii)oxalate?
- Q Provide one example of the interaction between matter and lightthat you observe around you. Tell us the following about thatinteraction:1). What are the bonds or atoms that are excited in...
- Q The gas phase reaction H2 + I2 --> 2HI is second order. Itsrate constant at 400 C is 0.0243 dm3/mol s. Calculate delta H,delta S, delta G and the pre-exponential...
- Q What is the buffer capacity for a solution that requires 3.35 mLof 0.10 M HCl to change the pH by 1 unit?
- Q Calculate the ionization constant of acetic acid:pH of 0.01 M acetic acid: 3.50pH of 1.00 M acetic acid: 2.34
- Q in an AES measurement should an external radiationsource such as hallow cathode lamp be used? why?compared to icp emission spectrometry, flame emissionspectrometry is little used except for the determinationnof thealkali...
- Q Will a precipitate of magnesium fluoride form when 200.0 ml of1.9 x 10-3 M MgCl2 are added to 300.0 ml of1.4 x 10-2 M NaF (Ksp (MgF2 = 6.9x 10-9...
- Q At what molar [H3O+] will PbS just start to precipitate from asolution consisting of 1.592e-6 M Pb(NO3)2 in 0.100 M H2S (satd)?H2S is bubbled through the solution to keep its...
- Q We used dichloromethane to perform a liquid-liquid extraction topull Eugenol out of our water distillate. Briefly describe how aliquid-liquid extraction works.
- Q A. Give an example of a Arrhenius, Brønsted-Lowry, and Lewisacid respectively, and show why they follow the deï¬nitions of eachrespective acid. B. Give an example for a species that has...
- Q If we replace one of the carbon atoms (and its associated Hatom) in benzene by a nitrogen atom, we obtain the moleculepyridine which is also an aromatic six membered ring....
- Q In the petroleum industry, limestone is usually given a nameusing the Dunham classification, as attached. Forany limestone you can follow the flowchart to find its correctname.This limestone consists mostly of...
- Q 1. If the HCl used in this experiment was prepared at aconcentration of 0.15M. Using your volume of HCl neutralized byyour whole tablet, calculate the mass of active ingredient (CaCO3)in...
- Q The average rate of the following reaction at a certaintemperature is 9.04×10-1 M/min. Calculate the value forthe rate of change of [HNO3], in M/min, at thistemperature. Report your answer to...
- Q Answer the following questions based on the reaction below.Report all answers to three significant figures.K2SO4(aq) +Sr(NO3)2(aq) → SrSO4(s) +2KNO3(aq)The concentration of K2SO4 is 0.222 M at thestart of the reaction,...
- Q Using the initial concentrations of [Fe(H2O)6]^3+, SCN^-, andthe equilibrium concentration of the [Fe(H2O)5SCN]^2+ complex,calculate the equilibrium concentrations of both [Fe(H2O)6]^3+ andSCN^-. All mol/L. Ice table is needed.Initial concentrations of [Fe(H2O)6^3+:...
- Q Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentallymixed. A 6.00-g sample is burned, and 2.80 g of CO2(g) is produced.What was the mass percentage of the table salt in the...
- Q Ammonia, NH3, if often labeled as NH4OH and called ammoniumhydroxide by chemical handling companies. Many argue that this isnot correct and misleading. Explain the reasoning behind callingthis NH4OH. Give chemical...
- Q A) HOBr has a Ka = 2.5 x 10-9. What is thepH of a 1.44M solution of HOBr?B) What is the % dissociation of a 1.4M acetic acid solution?Ka =...
- Q Under certain circumstances, carbon dioxide, CO2(g), can be madeto react with hydrogen gas, H2(g), to produce methane, CH4(g), andwater vapor, H2O(g): CO2(g)+4H2(g)→CH4(g)+2H2O(g)Part A How many moles of methane are produced...
- Q 1)The Ka of a monoprotic weak acid is 7.59 × 10-3. What is thepercent ionization of a 0.106 M solution of this acid? 2)The Kavalue for acetic acid, CH3COOH(aq), is...
- Q Determine whether each of the following equations is balanced ornot balanced:Part A2H2S(aq)+H2SO3(aq)→3S(s)+3H2O(l)Part BNaOH(aq)+HCl(aq)→NaCl(aq)+H2O(l)Part CCaCO3(s)→3CaO(s)+CO2(g)Part DNa2O(s)+HCl(aq)→NaCl(aq)+H2O(l)
- Q Given:Molar Concentration of Fe(NO3)3 is 0.2Molar concentration of NaSCN is 0.001Volume of Fe(NO3)3 is 10.00 ml (in 0.1 M HNO3)Volume of NaSCN is 2.00 ml (in 0.1 M HNO3)10.00 ml...
- Q 1. Give the mechanism for nucleophilic additionreactions to aldehydes and ketones, list factors that affect thisreaction.2. Give the mechanism for the Wittig reaction.3. Discuss nucleophilic acyl substitution reactions and providekey...
- Q In the sun, 1000g of hydrogen fuses to 993g of helium while theother 7g of matter is converted into energy using Einstein's famousequation E=mc2, where c is the speed of...
- Q One can prepare homemade lavender perfume by steamdistillation,one of the main components in the lavender oil islinalyl acetare (MM 196 g/mol), which has a vapor pressure of 20 mmHg at...
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