1. An aspirin tablet (acetylsalicylic acid, pK_a = 3.49, molecular weight = 180.15) was taken orally with cold water to make a solution of aspirin in the stomach fluids of 0.00167 M. The cold water produced a temperature in the stomach temporarily of 25 °C. What is the percentage of aspirin in the ionized form in the stomach in which the pH of the fluid is 3.2?

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there are 31.4g sample of an unknown hydrocarbon sample containing only C, H, and O. if those 31.4g are burned completely in O2 and gives 92.4g of CO2 and 27.0g of H2O, what is the empirical formula of the unknown compound?

Data Table 2. Reviewing Compounds.

Data Table 3. Benzene.

Data Table 4. Alcohols.

Data Table 5. Ethers, Aldehydes, and Ketones.

Data Table 6. Carboxylic Acids and Amines.

Questions

Describe the difference between an aldehyde and a ketone.

The pale pink color of the titration solution at the end point will fade to colorless after several minutes when exposed to the atmosphere. Account for this color change.

Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide.

4 HCl ( aq ) + MnO 2 ( s ) ⟶ MnCl 2 ( aq ) + 2 H 2 O ( l ) + Cl 2 ( g )

A sample of 43.3 g MnO 2 is added to a solution containing 47.5 g HCl

. What is the limiting reactant?

MnO 2

or

HCl

What is the theoretical yield of Cl 2 ?

theoretical yield:

If the yield of the reaction is 86.5 % , what is the actual yield of chlorine?

actual yield:

A 54.3 mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu).

If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder is naturally occurring nonradioactive chlorine atoms, how many disintegrations per second are produced by this sample? The half-life of chlorine-36 is 3.0×105 yr.

My answer: 1.77x10^7

please explain steps, thank you!

25mL of acetic acid was placed in a 250mL flask and diluted using water to the mark (250mL) and mixed. 25mL of this solution is then placed into a seperate flask and titrated using 16.5mL of 0.106M NaOH. What is the molarity of acetic acid (M.W.= 60.05 g/mol)?

Procedure 1. A 25 mL round bottom flask equipped with a stir bar is loaded with 13 mg of CdO powder, 0.6 mL of oleic acid, and 10 mL of 1-octadecene. The reaction flask is placed into a heating mantle and surrounded with aluminum foil so that the temperature can reach 225 °C, which will take approximately 1 hr. Some hot plates may heat up faster and the experiment can be performed sooner. 2. As the CdO solution is heating, the Se solution should be prepared. Five students can share the Se solution, since only 1 mL is required for each reaction. A 25 mL round-bottom flask equipped with a stir bar is loaded with 30 mg of Se and 5 mL of 1-octadecene and allowed to stir at room temperature. To this stirred solution was added 0.4 mL of trioctylphosphine via syringe. The mixture will turn homogeneous. At this point it is ready for the next step. 3. Once the CdO solution has reached a temperature of about 225 °C, add 1 mL of the Se solution from step 2 in a rapid fashion. As soon as you add the Se solution start collecting samples of approximately 1 mL into separate test tubes continuously as the reaction will be changing colors from yellow to orange to blood red. 4. After allowing the quantum dot solutions to cool, add 1 mL of pentane to the test tube containing ~1 mL of sample. Then, pipette the samples into a glass cuvette to record their UV-Vis spectra. Use pentane as the blank. The solutions collected in test tubes can be stored overnight in the hood or drawer without decomposition if there is not enough time to record UV-vis spectra.

What reaction is occurring when the selenium dissolves after trioctylphosphine is added.

List at least one chemical reaction if possible of Melatonin.

Explain the main difference between the adsorption (initial) stage and ordering process (second stage) of Self=Assemble monolayer using the relevant chemical concepts, models and forces.

12. An electrolytic dissociation of water. The ionic product of water. Hydrogen index. dissociation degree
(α) of the electrolyte as a quantitative description of the equilibrium ionization process. The division
of electrolytes on the strengths and weaknesses of the value of the degree of dissociation. Factors that
influence the degree of dissociation.

a) The solubility product for PbCl2 is 1.6 ∙ 10-5. The solubility product for AgCl is 1.6 ∙ 10-10. How does the solubility of lead chloride in a 0.10 M AgNO3 solution compare to the solubility in pure water? Will it be higher, lower og not changed?

Please explain your answer briefly as I dont get it.

b) The solubility of a salt MX is 1.1 ∙ 10-3 mol / L. What is the solubility product Ksp for the salt?