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- why would you write 13.90 when only two sig figs were given? Where does the extra "precision" come from?its also not 4.57e-132 A + B →→ 2 C Trial [A]0 [B]0 [C]0 Rate (M/s) 1 0.17 0.46 0.051 3.818 2 0.34 0.46 0.051 7.636 3 0.17 0.92 0.051 7.636 What is the order with respect to B? 0 or 1 or 2 or 3 or 4
- The deltaHs of cobalt (II) nitrate is +47.7 kJ/mol. What is the deltaHf of solid cobalt (II) nitrate? deltaHf(NO3-(aq)) = -205.00 kJ/mol deltaHf(Co2+(aq)) = -58.2 kJ/molMolecular Recognition (Supramolecular Chemistry) in organic chemistry deals with the "lock and key " mechanisms that form new molecules. However, little is known of this subject when moleules go beyond 1500 daltons (g/mole) for example macromolecules of polyolefins (polyethylene, polypropylene), thermoplastic polyesters and polyamides (nylon). It is understood that pre-directional H bonding is the mechanism of molecular recognition of macromolecules. Question: What is the immediate and post manifestation of inducing molecular recognition to condensation polymers and ring opening polymerization polymers like thermoplastic polyesters (PET ), and Nylon 66, 6 etc. (polyamides)?Please send me the mcqs A,B,C,D,E in 20 minutes it's very urgent plz
- 2. The observed nuclear moments of 209 Bi are: I=9/2; μ = + 4.1 μN; Q=-0.4 x 10-28 m² Determine the expected values for these moments according to the simple Shell model and comment on any significant differences.1. Write down the identification reactions for lodine. Specify the reaction conditions.we use the algebra method to find the pka values of 3.954 and the graphical method to find the pKa is 3.9533, with an accepted value of 4.0 Compare your algebraically and graphically determined pK values. Which method was moreaccurate? Why would you expect these values to be very close to each other?
- An impurity in water has an extinction coefficient of 3.45 * 103 M-1 cm-1 at 280 nm, its absorption maximum(A Closer Look, p. 576). Below 50 ppb, the impurity is not a problem for human health. Given that most spectrometers cannot detect absorbances less than 0.0001 with good reliability, is measuring the absorbance of a water sample at 280 nm a good way to detect concentrations of the impurity above the 50-ppb threshold?Calculate the number of Schottky defects per m3 in KCl at 500oC. Energy required for the formation of each Schottky defect is 2.6 eV / atom, the density of KCl at 500oC is 1.995 g / cm3, k = 8.62x10-5eV / K.The maximum safe [Ba2+]=1.5x10-5M. Maintaining 1.0x10-3M levels for each of the anions below would ensure that this level is achieved except (Ksp of BaF2=1.7x10-6, BaCO3=5.9x10-9, BaC2O4=7.4x10-14, and BaSO4=1.1x10-10) A SO42- B C2O42+ C CO32- D F-