Chemistry question and answers for September 10, 2023
- Q Howcan a spetrophemeter be used to determine the concentration ofunknown red food coloring solution?
- Q Based on their position in the peeriodic table, which atom wouldyou predict to form a compound with one chlorine atom and 2 bromineatoms respectively? a. potassium, magnesium b. carbon, lithium...
- Q The chemical reaction involved in the oxidation of hydroquinoneby hydrogen peroxide to produce quinone and water is: C6H4 (OH)2(aq) + H2O2 (aq) = C6H4O2 (aq) + 2 H20 (l). Calculate...
- Q The equilibrium constant, K, for the following reaction is1.20×10-2 at 500 K. PCl5(g) PCl3(g) + Cl2(g) An equilibrium mixtureof the three gases in a 1.00 L flask at 500 K...
- Q \"Starting with a 1.35 M HCl stock solution, five standardsolutions are prepared by sequentially diluting 5.00 mL of eachsolution to 100.0 mL. What is the concentration of the finalsolution?\"
- Q During an adiabatic expansion of an ideal gas, which staysconstant?a) Ub) Hc) SInternal Energy stays constant?Which one of the following is true?a) The entropy of an isolated system can only...
- Q Is the world CHIRAL ?-rationalize your idea
- Q 4. which of the following is most likely to exhibit covalentbondinga. MgCl2 b. NaCl c. OCs2 d. SO2 e. LiFit is either c or d not sure which is most...
- Q In a laboratory experiment, 2.0 g of aqueous lead (II) nitratewas mixed with 2.0 g of aqueous sodium chloride. Upon completion ofthe experiment, 0.65 g of lead (II) chloride were...
- Q Arrange the following gases in order of increasing rate ofeffusion at 298 deg K. (Hint:Look up the correct chemical formulas of these.)  a. Argon       b. Hydrogen bromide        c . Ethane(formula?)       d. Carbonmonoxide__________...
- Q General Chemistryplease write it by your own don't copy from the internet send itby email [email protected]Analysis Based: [Any 2 in less than 200 words]1. The sun emits a lot of...
- Q Experiment shows that the reaction 6I−(aq) + BrO3 −(aq) +6H+(aq) ⟶ 3I2 (aq) + Br−(aq) + 3H2O(l) obeys this rate law: rate =k[I- ][BrO3 ][H+] 2 .(a) What is the...
- Q Carbonic acid (H2CO3) is a weak diprotic acid withKa1=4.43�10?7 and Ka2=4.73�10?11. When sodiumbicarbonate (NaHCO3) is titrated with hydrochloric acid (HCl), itacts as a weak base according to the equationNaHCO3(aq)+HCl(aq)?H2CO3(aq)+NaCl(aq)1)What volume...
- Q The second order reaction 2A2B3 ----->A4B6 has a rate constant, k, of 7.35 x10-3M-1S-1 at a certaintemperature. If [A2B3]0 = 1.32M,how much time (s) does it take to reduce the...
- Q 1.a) You have the following mixture by mass:10% H+6% He+50% C3+20% O2+5% Fe4+4% N2+5% Mg+Calculate the mean molecular weight, in units of mH (mass ofhydrogen).b) You are designing a mixture...
- Q A chemistry student five possible Lewis structures for thecyanate ion.Give a reason why structures (4) and (5) are wrong. (2)Calculate the formal charge of each individual atom anddetermine which structure...
- Q An ideal gas mixture contains 220 mg N2 and 110 mg of O2. If thepartial pressure of O2 at 27 oC is 19.8 kPa determine(a) The total pressure(b) The molar...
- Q 1a. Arrange BaS,  GaP,  CaO,  RbClin order of decreasing lattice energy. (2)1b. ArrangeKBr,  InAs,  LiCl,  SrSe,  ZnSin order of increasing lattice energy. (
- Q Baking powder is a mixture of sodium bicarbonate and an acid,often cream of tartar (made of tartaric acid, H2C4H5O6). These twocomponents react when they are dissolved in water. A partialbalanced...
- Q 17) A 8.10 L container holds a mixture of twogases at 21 °C. The partial pressures of gas A and gas B,respectively, are 0.369 atm and 0.755 atm. If 0.120...
- Q When plotting a calibration curve to use for ionchromatography, would it be better to use peak area or peak heightvs concentration ? Is the R-squared value a good basis for...
- Q Answer the questions on Hess's Law listed below. Please notethat you must include units throughoutall of your calculations and provide your answer inscientific notation to the correct numberof significant digits.Click...
- Q Gaseous butaneCH3CH22CH3reacts with gaseous oxygen gasO2to produce gaseous carbon dioxideCO2and gaseous waterH2O. If36.4gof water is produced from the reaction of49.99gof butane and339.9gof oxygen gas, calculate the percent yield of water.Round...
- Q Can someone explain and sketch what a distillation would looklike \"in a slow stream of nitrogen introduced through a capillaryleak\"?Or how I could do that in a student lab type...
- Q Among the following pairs of solvents, which layer would be ontop? Or would they be miscible? Explain.Water and CyclohexeneWater and HexaneHelp PLease?
- Q Ca(OH)2 dissolves exothermically in water and the molarsolubility of Ca(OH)2 decreased as the temperature increases. Whatare the signs of Delta H and Delta S for dissolving Ca(OH)2?
- Q Calculate the equilibrium composition for the reaction Cgraphite+ H2O(g) _<->CO(g) + H2(g) at T = 298 K, 500 K, 1000 K, and2000 K and a pressure of 1 bar. For...
- Q Give Lewis dot structures and shapes for the following:a.VOCl3b.PCl3c.SOF4d.SO3e.ICl3f.SF6g.IF7h.XeO2F4i.CF2Cl2j.P4O6explain properly with explanation of hybridisation explainhybridisation of each part properly
- Q calculate the number protons, neutrons and electrons for K+,Cl-, and C
- Q Consider the combustion of butane:C4H10(g) +O2(g)->CO2(g)+H2O(l) (unbalanced)Let 2.00 g of butane gas and 3.05 atm of oxygen gas completelyreact (limiting) in a 2.00-L container at 125C.2.1 Will there be a...
- Q C​omment on the problems of using chromium-based oxidizingagents in practical organic chemistry.
- Q 1).If the pH of 1.000 L of HCL is 2.3377, what is the H+? Whatwould the final pH be if 0.17644 g of NaOH were added? Show thereaction between these...
- Q Based on their names alone, which of these enzymes requires anucleoside triphosphate as a substrate, or produces it as aproduct?Palmatoyl SynthaseRubicate SynthaseSuccinyl CoA SynthetaseCitrate Synthase
- Q 1. Write the isotope needed, by identifying A, Z, and X, tobalance the following nuclear fission reaction:23592U+10n→14054Xe+AZX+4 102. Complete each of the following nuclear equations:Part A10n+?→13253I+0−1eExpress your answer as an...
- Q For the reaction; write the conventional equation, ionicequation, and net ionic equation, when solid copper (II) hydroxideis \"dissolved\" by hydrochloric acid.
- Q Assuming that you work in a confectionery industry which includegum, sugars, and chocolates which are polysaccharides, describe ahypothetical method of developing a confectionery that will have ajelly-like consistency inner layer...
- Q A compound has a molar mass of 100 g/mol and the percentcomposition (by mass) of 65.45% C, 5.45% H, and 29.09% O. Determinethe empirical formula and the molecular formula.
- Q The equilibrium constant for thereaction2 C3H6(g) ↔C2H4(g) + C4H8(g)Is found to fit the expression: lnK =A + B/T + C/T2, between 300 and 600 K, where A = -1.04,B =...
- Q How many grams of water at 25°C must be added to a Dewar flask(isolated system) containing 20 g of ice at -5°C tosatisfy the conditions in (a) through (d)? Compute...
- Q Classify each of the following reactions:(i) Ca (s) + PbCl2 (aq) -------> Pb(s) + CaCl2(aq)(ii) MgCO3 --------> MgO + CO2(i) is Single displacement and (ii) is decompositionreactionBoth (i) & (ii)...
- Q Describe the pathway your body uses to produce energy during aperiod of starvation?
- Q A 21.8 g sample of ethanol(C2H5OH, 46.07 g/mol) is burned in a bombcalorimeter, according to the following reaction equation. If thetemperature of the rises from 13.0 °C to 79.3 °C,...
- Q Use the Ksp value in the table to calculate the molar solubilityof AgBr, Fe(OH)2, and PbBr2 in pure water
- Q 1. Complete both questions: a. Prove thatHSO4-Â Â can act as an amphotericsubstance. b. Explain why CH4 cannot act as anamphoteric substance.2. Try this question again. Be sure to useclaim-evidence-reasoning when you...
- Q The pKapKa of hypochlorous acid is 7.530. A 60.0 mL solution of0.130 M sodium hypochlorite (NaOCl) is titrated with 0.335 MHClHCl.Calculate the pH of the solution after the addition of...
- Q If a balloon has a volume of 1.900 L at a pressure of 1.947atmospheres, what will be the volume of the balloon if the pressureis increased to 4.624 atmospheres?Give your...
- Q home / study / questions and answers / science / chemistry /buffy carries out a neutralization reaction in ...QuestionBuffy carries out a neutralization reaction in her styrofoam cupcalorimeter, with a...
- Q Ethanol is commonly referred to simply as alcohol or spirits, Itis the principal type of alcohol found in alcoholic beverages. Itis a psychoactive drug and one of the oldest recreational...
- Q What kind of shift occurs when you add KNO3 to the equilibirumreaction: Fe3+ + SCN- <=> FeSCN2i know the reaction turns into an orange color
- Q Combustion analysis of a 0.2608 g sample of a compoundcontaining carbon, oxygen, and hydrogen only produced 0.5501 g ofcarbon dioxide, and 0.2703 g of water.Determine the empirical formula of this...
- Q Nitrous acid has a Ka of 4.0x10-4.Calculate the pH when 40.00 mL of 0.125 M HNO2 istitrated against 0.200 M NaOH and reaches the equivalencepoint.
- Q Which has the highest Zeff for its valenceelectron?A) HeB) SiC) KD) HAnd why?
- Q DryCoke composed of 4% inert solids (ash), 90% carbon, and 6% hydrogenat 40C is burned in a furnace with dry air at 40C. The solid refuseat 200C that leaves the...
- Q generate a titration curve from the information provided: yourtitrand is 48.0 mL of 0.500 M lactic acid and you will be titratingwith 1.0 M KOH.
- Q How many grams of aluminum sulfite will be formed from 125mL ofa 0.25 M solution of sulfurous acid. Complete this question byansering the following:a ) How many moles of sulfurous...
- Q Balance the following redox equations by the ion-electronhalf-reaction method: (a) (acid solution): ClO3 – + I– → I2 + Cl-(b) (acid solution): Cr2O7 2– + U4+ → Cr3+ + UO2...
- Q How much heat is evolved in converting 1.00 mol of steam at130.0 ∘C to ice at -50.0 ∘C? The heat capacity of steam is 2.01J/(g⋅∘C) and of ice is 2.09...
- Q How might the following errors affect the concentration of thestandard 0.0600 M solution?  Weighing - out 1.2 g of CuCl2 anhydrous instead of1.2 g of CuCl2 •2H2O.Over - diluting the stock...
- Q Mass of Flask and foil (G)= 52.2997 Mass of Flask, foil, andcondensed vapor(g) = 52.7528 Temp of boiling water bath= 99.8degrees C Volume of flask =140.1(ml) Barometric pressure (mmhg)=762.2 Room...
- Q a) Calculate the cell potential at 25°C for the cellFe(s) I (Fe2+ (0.100 M) II Pd2+(1.0 × 10-5 M) I Pd(s)given that the standard reduction potential forFe2+/Fe is -0.45 V...
- Q Calculate the pH of a mixture that contains 0.23 M of HCOOH and0.20 M of HC6H5O. The Ka of HCOOH is 1.8
- Q Argon at 400 K and 50 bar is adiabatically andreversibly expanded to 1 bar through a turbine in a steady process.Compute the outlet temperature and work derived per mole.
- Q A sample of carbonic acid (0.125 L, 0.154 M, pKa1 =6.35, pKa2 = 10.33) was titrated with 1.53 M NaOH.Calculate the pH at the first and at the second midpoints.
- Q Which the following statements about Histidine are true?The shape around the N of the NH2 group (N1) istrigonal planar.There are 6 pi bonds in Histidine.The C-C-O bond angle aroundthe C-O...
- Q A 15.2% (m/v) solution of sodium chloride (NaCl) is used toprepare 25.0 L of a physiological saline solution with aconcentration of 0.154 M NaCl. What volume of the 15.2% (m/V)solution...
- Q you wish to detemine the reaction order and rate constant forthe following thermal decomposition reaction 2AB2- -> A2 + 2B2A) what data wolud you collect? B) how would you use...
- Q 1) Calculate the maximum wavelength ofradiation (corresponding to the minimum energy) necessary to ejecta 1s electron from a 27Al atom (which has a 1s1s binding energy of1559.6 eVeV).
- Q Elemental S reacts with O2 to form SO3 according to thereaction:2S+ 3O2--> 2SO3a.) How many molecules are needed to react with 5.74g of S?Express your answer numerically in units of...
- Q The average kinetic energy of the molecules in a gas sampledepends only on the temperature, T. But given the same kineticenergies, a lighter molecule will move faster than a heaviermolecule....
- Q Consider the following reversible Hetererogenes reaction:C(s) + CO2(g) -><- 2CO(g)When equalibrium is reached at a certain point the totalpressure of the system is found to be 4.98 atm. If the...
- Q Discuss the physical appearance of the aqueous tea solutionversus the o¬rganic solution; why is tea so dark?
- Q 1.) A can of soft drink consists of CO2 dissolved in water and avapor space filled with CO2 and H2O vapor. Your goal is to find themole fraction of CO2...
- Q Show work please1. 3 Sn2+(aq) + 2 Al(s)??2 Al3+(aq) + 3 Sn(s). What is thevoltage for this cell?2. What is the Gibbs Free Energy for the above reaction assumingstandard conditions?3....
- Q There are 1000 P4 molecules and 500 S8molecules in a container. These are made to react and formP2S5 molecules. How many molecules of theexcess reactant would remain unreacted in the...
- Q Analytical Chemistry - Determination of Fe in Vitamintablet:Iron was reduced by 25 mL 6M HCl and DI water.Unknown Iron Sample: 10 mL diluted with DI water in 100 mLvolumetric flask,Iron...
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