Chemistry question and answers for September 25, 2023
- Q How do you calculate the pH of 1.0 Moles of HClO, HCO2H, andKHCO2?
- Q Solid Silver chloride has an extremely low solubility in water.Calculate the molar solubility of AgCl in a mixture of AgCl(s) and0.08 M NaCl(aq). Ksp = 1.8 × 10-10
- Q 1.what mass of oxygen is need to oxidize 125g of iron to iron (III)oxide?2. when water is decomposed by electrolysis,how many grams ofoxygen are produced when 1.25g of hydrogen is...
- Q 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O ∆Hrxn = -906 kJ A)Calculate the heat (in kJ) associated with the complete reaction of0.127 Kg of NH3. B)...
- Q Write the electronic configuration of the O2− ion.
- Q Recall that an emission transition involves a jump from an upperenergy level down to a lower energy level. With this in mind, whatquantum number do lines of the Lyman series...
- Q Which of these indicators would be appropriate for the followingtitrations.Methyl Orange pKa = 4.1 Â Â Bromthymol Blue pKa = 7.0Phenolphthalein pKa = 9.3ethylamine titrated with hydrochloric acidperchloric acid titrated with lithium...
- Q Approximately 240 mL/min of CO2 is exhaled by an average adultat rest. Assuming a temperature of 37.0 degrees Celcius and 1.00atm pressure:A) How many moles of CO2 is this?B) How...
- Q The pH of a 0.77M solution of boric acid H3BO3 is measured to be4.68. Calculate the acid dissociation constant Ka of boric acid. Besure your answer has the correct number...
- Q Predict the major products from the treatment of acetone withthe following:(a) [H+], NH3, (-H2O)(b) [H+], CH3NH2, (-H2O)(c) [H+], excess EtOH, (-H2O)(d) [H+], (CH3)2NH, (-H2O)(e) [H+], NH2NH2, (-H2O)(f) [H+], NH2OH, (-H2O)(g)...
- Q Calculate the molar concentration of OH? ions in a0.570MÂ Â solution of hypobromite ion (BrO?; Kb=4.0
- Q You have a 40mM stock of glucose, a 250mM stock of asparagine,and a 0.250M stock of  NaH2PO4, andmagnesium chloride powder (solid form) , MgCl2(FormulaWeight; 95.21g/mole).  How would you prepare (bespecific) 500mL of...
- Q What is the difference between a transmutation reaction and aradioactive decay reaction?
- Q Magnesium metal burns in oxygen to form magnesium oxide,MgOMgO.2Mg+O2→2MgO1.) How many grams of oxygen are needed to react with 28.0 gg ofMgMg?2.) How many grams of MgOMgO will result?3.) How...
- Q What are the values of  q, w,ΔU, ΔH, ΔS, ΔSsurr,and ΔSuniv for the following constant pressureprocess for a system containing 0.137 moles ofCH3OH ?CH3OH(g, 122.0 ºC, 1.00atm)  ⟶  CH3OH(l, 29.0 ºC, 1.00atm)Assume that...
- Q Consider the reaction 2 NH3 (g) ? N2 (g) +3 H2 (g). Suppose 6 moles of pure ammonia are placed ina 1.0 liter flask and allowed to reach equilibrium. If...
- Q Consider the titration of a 25.0 ml sample of 0.175 MCH3NH2 with 0.150 HBr. Determine eachquantity.a) The volume of added acid required to reach the equivalencepoint.b) The ph at one-half...
- Q A chemical equation is an expression that uses chemical formulasand other symbols to illustrate what ________ constitute thestarting materials in a reaction and what ________ are formed.
- Q In each pair complete the following 3 parts;     i) identify ALL theintermolecular forces present in each (ion-dipole; H-bonding;diploe-dipole; dispersion)     ii) circle the substance in eachpair with the higher boiling point    ...
- Q Given the following data and using Hess’ Law, Calculate changein Enthalpy for the reaction Overall reaction : NO(g) + O (g)------? NO2(g)2O3(g) ------? 3O2(g) ?H = - 427 kJO2(g) ------?...
- Q True or falseHeat of reactions are always equal to DHNaOH is hygroscopic substance, slowness in weighing anddissolution in water will result in an increase in the calculatedheat of solutionIn the...
- Q For a particular reaction at 215.7 °C, ΔG = 404.91 kJ/mol, andΔS = 748.20 J/(mol·K).Calculate delta G for -74.3 celcius.I've asked this question previously and the individual whoanswered got roughly...
- Q Predict the relative stereochemistry of each product and draw thepredicted structures for cinnamic acid, cis-stilbene,trans-stilbene
- Q How many grams of solid ammonium chloride should be added to1.50 L of a 0.145 M ammonia solution to prepare a buffer with a pHof 10.190 ?
- Q A birthday candle is 2.5 inches long and 0.75 cm in diameter.It’s made of paraffin wax, which is a mixture of varioushydrocarbons, but for the sake of argument we’ll assume...
- Q A sample of natural gas contains 8.24 moles of methane, 0.421moles of ethane, and 0.116 moles of propane. If the total pressureof the gases is 1.23 x 103 mm Hg,...
- Q Cgas = 1.3 J/g×K   Hvap =38.56 kJ/mol   Cliq = 2.3J/g×K     Hfus = 5.02kJ/mol   Csolid = 0.97 J/g×K    Condensation Temp =78.0oC              Freezing Pt = -114.0oCCalculate the amount of heat required toconvert 92.6...
- Q A total of 2.00 mol of a compound is allowed to react with waterin a foam coffee cup and the reaction produces 154 g of solution.The reaction caused the temperature...
- Q Define each of the three terms in words and write the equationthat relates kw, pH, and pOH.
- Q Please finish and balance the following reactions, then statethe molecular, complete ionic, and net ionic equations foreach:1. Pb(NO3)2 + NH4OH --->2. Pb(NO3)2 + H2SO4--->3. Pb(NO3)2 + HCl --->4. Pb(NO3)2 +...
- Q This question regards the process of making ice cream with dryice:How are thermodynamics involved in making the ice cream 'creamy'vs. 'grainy' (like what you get with freezer burned ice cream)?
- Q ACID/BASE PRACTICE PROBLEMS(a) 3 moles of sodium nitrate are placed in 1 L of water.Calculate the pH.(b) Calculate the Ka and the % ionization of a weak acid if 0.02moles...
- Q It is known that the vapor pressure of pure water at 77C is41.847kPa, and at 100C is 101.325kPa(a)Â Â Â Derive the relationship of vapor pressureto the temperature(b)Â Â Calculate the vaporization enthalpy of water(c)Â Â Â What...
- Q An aqueous solution contains 0.30 Mhydrocyanic acid.One Liter of this solution could be converted into a buffer bythe addition of which of the following reagents?(Assume that the volume remains constant...
- Q Prove that for a wave function to be a simultaneous eigenfunctionof two operators A and C, the operators must commute.
- Q show a general example of a net ionic equation for thenuetralization of a strong acid (HA)
- Q Explain why chirality in molecules is an important property foribuprofen
- Q Is ibuprofen sold as a single enantiomer or a racemic mixture?How many stereocenter(s) does the molecule have? Does ibuprofenexist in diastereoisomeric form?
- Q The following data were collected for a phosphorescent paintbeing proposed for use in coating highways.Time (s)Intensity (lux)10150520745303694018350906045702280119051003Calculate the half-life for the paint.What is the intensity of the light at the...
- Q Explain how coulometry differs from amperometry. Why doescoulometry give better precision, while amperometry is moresuitable for sensors?
- Q Select the pair of substances in which an acid is listedfollowed by its conjugate base. A) H+, HClB) NH3, NH4+C) HPO42-, H2PO4-D) HCO3-, CO32-E) CH3COOH, CH3COOH2+
- Q The followinginformation is used for this question. Balloon A contains 2.50 x1020molecules of nitrogen gas. Balloon B contains 2.50 x 1020atoms of Ar gas.  The MM of N2 is28.02 g/mol....
- Q A 35.00mL sample of aqueous lactic acid(HC3H5CO3) is titrated tothe equivalence point with 65.00mL of 0.15 M KOH(aq). What is thepH of the resulting solution? The Ka for lactic acid...
- Q The enthalpy of vaporization of Substance X is 8.00kJmol and itsnormal boiling point is −100.°C . Calculate the vapor pressure of Xat −117.°C .round to 2 sig figs
- Q 2. Using the same method, answer the same questions for mixing 30 gof hydrogen fluoride and 30 g of glass (which is made of silicondioxide) with focus on determining the...
- Q Which of the following are true statements about ketones?Select all that apply:Acetone can be used as a solvent for lacquer (includingfingernail polish).They each contain a functional group in the middle...
- Q 1. What is the name of the intermolecular force caused by aninstantaneous dipole in each below particles?a)ionic attraction b)dispersion forces c)covalent bondd)hydrogen bond2. For each of the following compounds, indicate...
- Q Fischer EsterificationAcetic Acid + Ethanol in the presence of Dowex, a solidcatalyst. 4 samples were placed in 4 tubes, heated in a waterbath.Test tube 4 was left in the water...
- Q Why is it that temperature fluctuations during atomization (i.e.in the plasma or flame) are a big problem for atomic emissionspectroscopy, but less of a problem for atomic absorbancespectroscopy? Include an...
- Q In an experiment reported in the scientific literature, malecockroaches were made to run at different speeds on a miniaturetreadmill while their oxygen consumption was measured. In one hourthe average cockroach...
- Q A.A mixture of carbon dioxide andargon gases, in a 7.78 L flask at41 °C, contains 12.9 grams ofcarbon dioxide and 11.9 grams ofargon. The partial pressure ofargon in the flask...
- Q formic acid is a weak acid Ka= 1.9 x 10^-4 . Calculate the ph of a.50M solution of formic acid. what is the degree ofionization?
- Q You have a stock of a DNA solution at 1.2mg/ml, the DNA fragmentbeing 980bp in length. How do you prepare a dilution of this DNAthat has a concentration of 0.5uM...
- Q An unknown solid is entirely soluble in water. On addition ofdilute HCl, a precipitate forms. After the precipitate is filteredoff, the pH is adjusted to about 1 and H2S is...
- Q What is the pH in a titration of 125 mL of 0.45 F sulfurous acid(H2SO3) with a 1.23 M solution of sodium hydroxide before any baseis added?
- Q Some of the reactions for coal gasification are as follows:Reaction 1:   C(s) + H2O(g) « CO(g) +H2(g)                ΔHo= 131.3 kJ/molReaction 2:   CO(g) + H2O(g)«CO2(g) + H2(g)                ΔHo= -41.2 kJ/molReaction 3:   CO(g) +...
- Q 5. The formation constant of thesilver-ethylenediamine complex, Ag(NH2CH2 CH2NH2)+, is 5.0 x 104.Calculate the concentration of Ag+ in equilibrium witha    0.10 M solution of the complex. (Assumeno higher order complexes).6....
- Q What is concentration of sodium nitrate if 25.5 g of sodiumcarbonate (MM = 105.99 g/mol) are added to a 500 mL of a 2.50 Miron (III) nitrate solution? Assume to...
- Q In a practical session, Hubert was asked to prepare potassiumperoxide, K2O2 (s). He measured 3.910 g of potassium metal andburnt it in a container of oxygen gas with a mass...
- Q 1) C2H6 (g) ----->C2H4 (g) + H2 (g) ΔH1 =?2) C2H6 (g) + 3.5O2 (g)-----> 2CO2 (g) + 3H2O (l) ΔH2= -1558 kJ/mo3) C2H4 (g) + 3O2 (g) ----->2CO2 (g)...
- Q A 25.0 mL sample of 0.100 M HC2H3O2 (Ka = 1.8 x 10^-5) istitrated with a 0.100 M NaOH solution. What is the pH after theaddition of 12.5 mL of...
- Q Whydo heavy metals, like Hg2+ and Pb2+, cause poisoning? How does anantidote, like milk or raw egg white, work?
- Q 1. Instrumentation is a key aspect of chemistry and specificallyspectroscopy for organic chemistry. Why is spectroscopy thepreferred technique in your opinion? How does this make the fieldof organic chemistry possible?...
- Q Howdoes the Kd value conpare with the Ki value? What does this mean interms of binding?
- Q Balance each of the following redox reactions occurring inacidic aqueous solution.art AK(s)+Cr3+(aq)→Cr(s)+K+(aq)Express your answer as a chemical equation. Identify all of thephases in your answer.SubmitMy AnswersGiveUpPart BCd(s)+Cu+(aq)→Cd2+(aq)+Cu(s)Express your answer as...
- Q Wine ChemistryYou are given the task of analyzing a sample of grapes todetermine if a vineyard is ready for harvesting1a. The concentration of tartaric acid is critical. This can bedetermined...
- Q Calculate how much energy is required to heat 20 mL of waterfrom room temperature to 40 C & also how much energy isreleased when 20 mL of water is cooled...
- Q Would you expect each of the following atoms to gain or loseelectrons when forming ions? Explain details and what is the ruleapply to it? 1. P 2. Te
- Q How to name organic molecule given a structure?
- Q Part AHow many moles of HF (Ka=6.8
- Q A 83.0 mL sample of 0.0200 M HIO4 is titrated with 0.0400 M CsOHsolution. Calculate the pH after the following volumes of base havebeen added. (a) 11.6 mLpH =(b) 40.7...
- Q Calculate the pH at the equivalence point in titrating 0.045 Msolutions of each of the following with 0.061 M NaOH.(a) hydrochloric acid (HCl) pH =(b) acetic acid (HC2H3O2), Ka =...
- Q which do you think has a greater effect on evaporationrate: molar mass or the type of intermolecular force(s) present?Explain your answer
- Q Colligative Properties:What are the four colligative properties (module #4 pg 38)?If you add NaCl to water, what happens to the boiling point?Explain with a drawing why the freezing point of...
- Q Determine the %(p/p) of CaCO3 of a 25 mg chalk sample dissolvedin 25 mL water, 12.5 mL HCl 0.1 M, titrated with 8.6 mL NaOH 0.1M.
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