Chemistry question and answers for September 04, 2023
- Q What is the oxidation number of the following elements when theyform ions?1. Se2. Li3. Al4. P
- Q 2) (40 pts) An alligator that has been warming in the sun swimsinto cold water. Calculate the following parameters, if thealligator temperature (underneath the scales) is 33 °C and thewater...
- Q The sulfur in a 5.00 g sample of steel was evolved asH2S and then collected in a solution of CdCl2to produce the precipitate CdS. The CdS was then titrated withexcess...
- Q Consider the diprotic acid H2X, where Ka1= 1.75 x 10-5 and Ka2 = 4.3 x10-12 at 25 °C. The concentration of HX- (aq)in a 0.125 M solution of H2X at...
- Q Construct the titration curve, for the titration of 50.0 mL of0.125 M trimethylamine with 0.175 M HCl (aq).A. Calculate the initial pH of the solution in the flask.B. Calculate the...
- Q for the following compounds:i) give the correct name and indicate the possible isomers forparts (d, f, g,h,j)ii) determine the dn configuration, coordinationnumber for the metal and electron count according to...
- Q I am really struggling with this chemistry problem. I don`t evenknow how to start..The problem is about recrystallization:Two crystalline compounds x and y have the same solubility ratioin water( the...
- Q Consider the titration of 50.0 mLof 0.130 MHNO3 with 0.450 M NaOH.How many millimoles of HNO3 are present at the start of thetitration?How many milliliters of NaOH are required to...
- Q The heat of solution of potassium acetate(KC2H3O2) in water is -15.30kJ/mol.If 19.70 g of KC2H3O2(s) isdissolved in 600.0 mL of water that is initially at 24.50 °C,What will be the...
- Q Consider the following liquids with similar molar masses.Predict which has the weakest intermolecular attraction based onlyon boiling point data.  butane (Bp @ 760 mm Hg = -0.5 °C)ethyl chloride (Bp @...
- Q Describe the Applications, Reagents, and Procedure of theWestern blot technique. Add bibliography.
- Q Describe the Applications, Reagents, and Procedure of theSouthern blot technique. Add bibliography.
- Q 23. KCN is insoluble in benzene but in the presence of18-crown-6 the nucleophilic substitution reactions take place veryfast using CNas nucleophile- Justify with mechanism.24. Arylamines and heterocyclic aromatic amines are...
- Q What will the molarity be of the resulting solutions made bymixing the following? Assume that volumes are additive.a)116 mL of 3.6 M H3PO4 with 776mL of H2O(b) 219 mL of...
- Q calculate the ph of .010 M sodium acetate
- Q A) A solution of Ba(OH)2 has a molarity of 0.00617mol/L. Calculate the final pH of the solution.B) Consider the reaction: CaBr2(s) → Ca(s) +Br2(l)Which of the following statements is correct?...
- Q Sketch a general Lineweaver-Burke plot that illustrates thekinetic behavior of a non-allosteric enzyme. Identify on your plotthe features that allow one to determine Vmax and KM for theenzyme.How would one...
- Q Is more than one shape possible for the caproic acid molecule?If you built a model of stearic acid by extending the carbon chainof caproic acid to18 carbons, would it have...
- Q For the following systems at equilibriumA:2NOCl(g)⇌2NO(g)+Cl2(g) B: H2(g)+I2(g)⇌2HI(g) classify thesechanges by their effect.Drag the appropriate items to their respective bins.Bins: leftward shift, no shift, rightward shiftItems: system A Decrease container...
- Q explain how PLA is biodegradable?
- Q Consider a crystallization of sulfanilamide in which10ml of hot 95% ethyl alcohol is added to 0.10g of impuresulfanilamide. After the solid has dissolved, the solution iscooled to room temperature and...
- Q Constant-volume calorimeters are sometimes calibrated by runninga combustion reaction of known ΔE and measuring the change intemperature. For example, the combustion energy of glucose is 15.57kJ/g. When a 2.000 g...
- Q Calculate the pH. Please show steps.Nitric acid 0.00125 MAcidPotassium hydroxide 0.00133 MBaseAmmonia 0.00120 MBaseHypochlorous acid 0.00128 MAcidSodium hypochlorite 0.000125 MBaseAmmonium chloride 0.00142 MSaltCarbonic acid 0.00144 MAcidHydrochloric acid 4.55 MAcidPhosphoric acid...
- Q You need to prepare an acetate buffer of pH 5.55 from a 0.654 Macetic acid solution and a 2.92 M KOH solution. If you have 530 mLof the acetic acid...
- Q Draw several ammonia molecules in Lewis structure, then add insome hydrogen bonds where appropriate; label the atoms that areinvolved in the hydrogen bonds as partially positive ornegative.
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