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19 Nov
2020

A redox reaction has been balanced in acidic conditions. In the process, H (aq)…

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A redox reaction has been balanced in acidic conditions. In the process, H (aq) appears on the reactant side of the reaction. Use words and one example to clearly explain why hydroxide ion must be added to both sides of the reaction to change to basic conditions when the H (aq) ions can only be found as a reactant in the reaction.
According to the textbook, “A recent area of research involves the development of paper-based measuring devices. For example, the nonprofit
According to the textbook, “A recent area of research involves the development of paper-based measuring devices. For example, the nonprofit organization Diagnostics for All (DFA) based in Cambridge, Massachusetts, has invented a paper-based device to detect proper liver function. In this test, a drop of the patient’s blood is placed on the paper, and the resulting color that develops can be used to determine whether the person’s liver function is normal, worrisome, or requires immediate action. Because these paper-based devices are cheap, disposable, and easily transportable, they are especially useful in developing countries” (Zumdahl/DeCoste , 2019). In your initial post to the discussion, answer the following questions: -Do scientists have a moral obligation to use chemistry for purposes like the one stated above? Why or why not? -How else can chemistry be used to make a positive impact on the world? -How might chemistry be misused to have a negative impact? What measures can scientists put in place to remove that threat?
An electron in a hydrogen atom drops from the nnnRH = 6 state to the = 4 state. What is
An electron in a hydrogen atom drops from the nnnRH = 6 state to the = 4 state. What is the energy (in J) of an electron in the = 4 level of the Bohr H atom? = 2.18 × 10-18 J (Write answer as a decimal number or in scientific notation in the following format: -1.23e-45)
The blue standard solutions in this lab are prepared using serial dilution and the same dilution factor. To prepare red
The blue standard solutions in this lab are prepared using serial dilution and the same dilution factor. To prepare red dye standard solution B4, 1000. µL stock blue dye solution was mixed with 1000. µL of deionized water. The R4 concentration is 0.0000126M.What is the concentration of blue dye 1, 2 and 3?
2. With respect to solubility equilibria (Ksp), what are the key differences in Pb2 solubility with and without phosphate added?
Chemistry Assignment Writing Service2. With respect to solubility equilibria (Ksp), what are the key differences in Pb2 solubility with and without phosphate added? How would the concentration of free Pb2 be expected to change upon addition of phosphate (hint: think of Le Chatelier’s principle)? 3. In order to keep the Pb3(PO4)2(s) scaling from redissolving, what [PO4 3- ] is needed to keep the water saturated (solve for phosphate similar to 1c)? What happens if [PO4 3- ] is below that value? 4. According to the EPA Lead and Copper Rule (LCR), the action level for Pb in drinking water (the level at which threat to human health requires public notification and action towards mitigation) is 15 ppb. If you were to add enough phosphate to the system saturated with respect to Pb3(PO4)2(s), would the [Pb2 ] be below the action limit? Show your work in converting Pb2 from molarity to ppb.
For the graphic determination of a titration end point the first derivative of a titration curve is often used visualize
For the graphic determination of a titration end point the first derivative of a titration curve is often used visualize the endpoint. This end point volume for a first derivative plot corresponds to:A. The volume base added where the first derivative curve crosses the x-axis.B. The volume base added where the first derivative curve has maximum slope.C. The volume base added where the first derivative curve crosses the y-axis.D. The volume base added where the first derivative curve has minimum slope.E. The volume base added where the first derivative curve has a maximum negative slope.
Experimental Procedure: Standardization of a NaOH solution A. Preparation of Approximately 0.1 M NaOH solution 1. Obtain 50.00 mL of
Experimental Procedure: Standardization of a NaOH solution A. Preparation of Approximately 0.1 M NaOH solution 1. Obtain 50.00 mL of the 1 M NaOH in the virtual stockroom and pour it in a 250-mL volumetric flask. 2. Pour about 250 mL of distilled water in a proper size beaker and use this to dilute the NaOH in the volumetric flask to the 250-mL mark. Select the “Realistic” mode when pouring the water to the flask. Pour up to just above the neck directly from the beaker and then you might consider using a disposable pipette the rest of the way. 3. Pour about 100 mL of the diluted NaOH solution into a 250-mL beaker and then fill a 50- mL burette with your NaOH solution from it up to or just below the 0.00-mL line. B. Standardization of the NaOH solution 1. Measure about 15 mL of your 0.500 M KHP solution into a 250-mL Erlenmeyer flask. Record the actual reading on your graduated cylinder rather than from the information table. 2. Add 0.20 mL of the phenolphthalein indicator using the “Significant Figures” mode. 3. Record the initial volume reading of NaOH in the burette. 4. Add NaOH from the burette to the KHP solution in the Erlenmeyer flask until the first permanent faint pink color can be observed. 5. Record the final volume reading of the meniscus of NaOH in the burette. 6. Repeat the titration (i.e., Steps 1 to 5) at least two more times. 7. Calculate the molarity of NaOH for each trial using Equation (3) and then determine and report the average.http://chemcollective.org/vlab_download if you wish to work offline and are comfortable in downloading and installing software, you can download and install Virtual Lab on your computer by downloading it from http://chemcollective.org/vlab_download. To load the assignment, select “Load Homework…” from the “File” menu, and select Standardization of NaOH with a KHP Solution.
What is the Kc262 -42-2Trial A: [Co(H262 Cl- CoCl42-Trial B:[Co(H262 Cl-CoCl42-Trial C:[Co(H262 Cl-CoCl42–6 value for the equilibrium reaction, [Co(HO)](aq) 4 Cl
What is the Kc262 -42-2Trial A: [Co(H262 Cl- CoCl42-Trial B:[Co(H262 Cl-CoCl42-Trial C:[Co(H262 Cl-CoCl42–6 value for the equilibrium reaction, [Co(HO)](aq) 4 Cl (aq) –> CoCl (aq) 6 HO (l) , in the following trials? O)]: 0.967M: 1.87M :0.033MO)]: 0.297M :4.44M : 0.328MO)]:0.769N :0.154M :1.22 x 10MTrial D:[Co(H2O)6]2 :0.416MCl- :2.39MCoCl42- :0.039MTrial E:[Co(H2O)6]2 :0.642MCl- :0.568MCoCl42- :0.358M
CHEM WAVE EQUATION PRACTICE equations: c = E = h constants: c = 3.0 x 108 m/s h = 6.626
CHEM WAVE EQUATION PRACTICE equations: c = E = h constants: c = 3.0 x 108 m/s h = 6.626 x 10-34 Js λ ν νWhat is the wavelength of a wave that has a frequency of 3.59 x 105 Hz?A photon in a wave has a frequency of 8.400 x 109 Hz. What is the energy of the photon?Calculate the frequency of a wave with a wavelength of 9.1 x 10-5 m.A quantum has a measured energy of 2.678 x 10 -18 J. What is its frequency?What is the wavelength of em radiation having a frequency of 8.0 x1011 Hz?What is the frequency of em radiation having a wavelength of 4.750 x10-7 m?What is the energy of em radiation having a frequency of 6.50 x1010 Hz?What is the energy of a photon with a frequency of 4.48 x1012 Hz?

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