Chemistry question and answers for September 18, 2023
- Q Which of the following reactions is/are redoxreactions?  You may select more than one reaction.BaCl2(aq) + Na2SO4(aq) =BaSO4(s) + 2NaCl(aq)Cl2(g) + 2K(s) = 2KCl(s)O2− + H2O(l) = 2OH−PH3(g) + HNO3(g) = NO2(g)...
- Q 5. Suggest 5 ways that the concentration of PH3 couldbe increased in the following reaction.P4 (g) + 6 H2 (g) ⇌ 4 PH3 (g)       ΔHo = 110kJ/mol6. Gaseous nitrogen dioxide forms...
- Q In the body, mercury's toxic effects are known to result fromits ability to disrupt and insert into S-S bonds in criticalenzymes. Fish, particularly tuna, which contain high levels ofmethylmercury are...
- Q An industrial wastewater contains a total cyanide concentrationof 10-3M and a total nickel concentration of 2ï‚´10-4M. Calculate theconcentrationof all species (HCN, CN-, Ni2+, and all cyanide andhydroxy complexes of nickel)...
- Q A pH 3.30 buffer is prepared from iodoacetic acidICH2COOH (pKa = 3.175), and sodiumiodoacetate, ICH2COO-Na+ . Ifionic strength of the buffer solution must not exceed 0.200 M, whatare the maximum...
- Q 1. Compare the advantages and disadvantages of each pH method(i.e. cost, ease of use- time it takes to set up and take a pHmeasurement) including accuracy and precision of each...
- Q You are trying to establish the IgG response from a recentlyvaccinated individual, where it will be important to know how muchIgG they have both before and after the vaccination. You...
- Q Suppose that a student collects the following spectrophotometricdata to determine the relative concentrations of HMR and MR insolution:The abosorbance at 425 nm was measured to be 0.280 and at 520...
- Q You have evaluated the theoretical pI of Our Protein Of Interest(OPOI), based on its amino acid sequence, to be 6.4. You select aworking pH of 8.0 and will use what...
- Q You purified the plasmid from an overnight cell culture anddissolved the plasmid DNA in 100 μL 0.1M Tris buffer (pH8). Toquantify the plasmid, you took an absorbance measurement at 260...
- Q A sample of 10.00 g of sodium reacts with oxygen to form 15.02 gof sodium oxide (Na2O) and sodium peroxide(Na2O2). Calculate the percent composition ofthe mixture.___% Na2O___% Na2O2
- Q How does the vapor pressure of a compound determine itspotential to be used as a fumigant?
- Q A 70.0mL sample of 1.0 M NaOH is mixed with 44.0 mL of 1.0 MH2SO4 in a large Styrofoam cup; the cup is fitted with a lidthrough which passes a...
- Q Urea (NH2)2CO is prepared by reactignammonia with carbon dioxide. The byproduct is water. 637.2g ofammonia are reacted with 787.3g of carbon dioxide.A) write a balanced equationB) Determine which of the...
- Q A patient needs to be given exactly 500 mL of a 5.0% (w/v)intravenous glucose solution. The stock solution is 65% (w/v). Howmany milliliters of the stock solution are needed to...
- Q The x coordinate of an electron is measured with anuncertainty of 0.200 mmmm . What is vxvxv_x, the xcomponent of the electron's velocity, if the minimum percentageuncertainty in a simultaneous...
- Q   12. In a solution, when the concentrations of a weakacid and its conjugate base are equal,….[A] the system is not at equilibrium[B] the -log of the [H+] and the -log...
- Q Nitrogen from gaseous phase is to be diffused into pure iron at973 K. Surface is maintained at 0.1 wt% N, what will be theconcentration 1 mm from the surface after...
- Q 7. (16 point) (a) The pH of a 1.00 L buffer solution containing0.15 M HOCl and 0.15 M NaOCl is 7.52.HOCl (aq) + H20 (l) ---> OCl- (aq) + H3O+...
- Q 1.Starting from the enzyme-catalyzed reaction:S -> PDerive the (a) Michaelis-Menten Equation (b) starting from theMichaelis-Menten equation, derive the Lineweaver-Burker plot.Provide brief explanation in each step.2. Predict the optimum pH and...
- Q Consider the following reactions:Zn^2+ + 4H3 <----> Zn(NH3)4^2+ beta 4 = 5.01 x 10^8Zn^2+ + 2e^- <-----> Zn(s) E degree = -0.762 VAssuming there is negligible current and nearly all...
- Q 1e. The formula for the compound name iodic acid:Group of answer choicesHIO4HIHIO3HCO21f. The name of the compound Cl2O3:Group of answer choicesdichloride oxidedichloride trioxygendichlorine trioxidedichlorine trioxygenchloroxide1g. The total number of valence...
- Q 10. Given the data below, what is ∆Hr for the reaction:FeO   + CO → CO2   +  Fe                                                                                 ∆HrFe2O3 + 3CO → 2Fe +3CO2                  –35kJ3Fe2O3   + CO → CO2 +2Fe2O4             –70 kJFe3O4 + CO →...
- Q 1. What is the concentration of hydroxide ions [OH- ] in purewater?2. For each type of acid and base below first define acid andevaluate Fe+3 as an acid by each...
- Q A solution of pentane and ethanol CH3CH2OH that is 50.% pentaneby mass is boiling at 57.2°C. The vapor is collected and cooleduntil it condenses to form a new solution.Calculate the...
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