Chemistry question and answers for October 02, 2023
- Q The human body contains 0.20% natural potassium. K-40 represents0.0117% of naturally occurring potassium. 1. What is theradioactivity due to K-40 for a person weighing 70 kg? 2. What isthe radioactivity...
- Q 1.An aqueous solution of calcium hydroxide isstandardized by titration with a 0.171 M solutionof hydroiodic acid.If 27.0 mL of base are required to neutralize10.6 mL of the acid, what is...
- Q What are some medical or commercial applications of gases, andhow are gas laws a part of those applications? Post a thoroughinitial response to the discussion question (at least 7-10sentences, or...
- Q What must be the molarity of an aqueous solution of NH3 if it is4.3 % ionized? Express your answer using two significantfigures.
- Q A student makes a solution in thelaboratory by dissolving 53.5 g of NH4Cl in enough waterto make 375 mL of solution, with a density of 1.05 g/mLa. Calculate the Molarity...
- Q A fixed quantity of gas at 21 ∘C exhibits a pressure of 758 torrand occupies a volume of 5.42 L .A) Calculate the volume the gas will occupy if the...
- Q What volume of O2 at 836 mmHg and 31 ∘C is required tosynthesize 12.5 mol of NO?Additional info: The industrial production of nitric acid (HNO3)is a multistep process. The first...
- Q What are the theoretical bond energies and theoreticalenthalpies for benzoic acid and sucrose?
- Q Part A Table of C-13 NMR data for1-phenylcyclohexanol using the following headingsfor each compound (carbon types: CH, CH2, CH3, CH-OH, etc) ChemicalShift (ppm) Carbon TypePart B Table of C-13 NMR...
- Q Balance the following chemical equation:Cu(s)+HNO3(aq)=Cu(NO3)2+NO(g)+H2O(l).I missed this question on a quiz after trying to balance it bothalgebraically and by standard guess and check methods. Severalclassmates missed it as well. The...
- Q Describe how you would prepare a liter aqueoussolution of each of the following reagents(a) 1 M glycine(b) 0.5 M glucose(c) 10 mM ethanol(d) 100 mM hemoglobin
- Q Consider that a single solution that is listed as 1M NaCl has atotal ion concentration that is twice as large due to the chemicalformula containing two ions that are dissociatedin...
- Q A 1.5 kg block of iron at 32 ∘C is rapidly heated by a torchsuch that 14 kJ is transferred to it. What temperature would theblock of iron reach (assuming...
- Q 1. The molecular weight between crosslinks (MC) is one of themost important parameter that describes the thermoset networkstructure. Describe how the MC is related to the followingproperties:(a) Tg, (b) modulus,...
- Q What are the changes in enthalpy, entropy, and free energy forthe hydrogenation of C2H4 to C2H6, and C3H6 to C3H8 at 25 degreesC.
- Q I'm trying to under stand the Haber process and this equilibriumreaction N2 +3H2 -----> 2NH3 + energy. In order to increase theyields of ammonia1. remove amonia as it is formed2....
- Q You have 525 mL of an 0.15 M acetic acid solution. What volume(V) of 2.00 M NaOH solution must you add in order to prepare anacetate buffer of pH =...
- Q A zero order reaction starts with an initial concentration ofreactant of 1.00 M and has a rate constant of1.65x10-5M/s. What is the concentration of the reactantafter 100 seconds?
- Q 5) Zn1+xO, Ti1+xO, Cu2S1+x, CuI1+x and ZnO1+x aresemiconductors. What type of semiconductors are they (n- orp-type)?
- Q One of the possible initial steps in the formation of acid rainis the oxidation of the pollutant SO2 to SO3 by the followingreaction: SO2(g) + 1/2 O2(g) -> SO3(g) The...
- Q Consider the system:A (aq) → B (aq)at 251 K where ΔGoform A = -11.7 kJ/mol andΔGoform B = -14.1 kJ/mol. Calculate the concentration ofA at equilibrium when 1.71 mol of...
- Q What is the pH of a buffer solution made by dissolving 10 g ofsodium acetate in 200 ml of 1M acetic acid? The Ka for acetic acidid 1.7*10-5.B. Calculate the...
- Q Consider the titration of 100.0 mL of 0.130 MH2NNH2 (Kb= 3.0 x 10-6)by 0.260 M HNO3. Calculate the pH of theresulting solution after the following volumes of  havebeen added: 0.0 mL,...
- Q Determine the concentrations of Na2CO3, Na , and CO32– in asolution prepared by dissolving 1.82 × 10–4 g Na2CO3 in 1.75 L ofwater. Express all three concentrations in molarity. Additionally,express...
- Q a solution contains Al^3+ and Co^2+ the addition of 0.3471 Lof 1.814 M NaOH results in the complete precipitation of ions asAl(OH)3 and Co(OH)2 the total mass of the precipitate...
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