​In the reaction where cyclohexanol is put into a round bottomflask with phosphoric acid and sulfuric acid and heated in a fractional distillation system, why is it important to use a round bottom flask that fits tightly onto the distillation apparatus as th reciever. Why is it then cooled in an ice bath?

A 0.4569 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O and removed by filtration. The resulting filtrate and washings were diluted to a total volume of 250.0 mL. A 20.00 mL aliquot of this solution was buffered, and titration of the lead, copper, and zinc in solution required 34.02 mL of 0.001513 M EDTA. Thiosulfate was used to mask the copper in a second 25.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.42 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a third 30.00 mL aliquot. Titration of the lead in this aliquot required 25.92 mL of the EDTA solution. Determine the percent composition by mass of each metal in the pewter sample.

Before working this pre-lab exercise read the theory, experimental precedures and sample calculations outlined in the laboratory manual. Suppose that a student collects the following spectrophotometric data to determine the relative concentrations of HMR and MR in solution: The abosorbance at 425 nm was measured to be 0.310 and at 520 nm was 0.770, the slopes corresponding to standard Beer's Law plots were as follows: αIA = 0.072 αIB = 0.306 αIIA = 0.760 αIIB = 0.036 Using this data, calculate the ratio between the relative concentrations of MR- and HMR in this solution.

The following electron configurations represent excited states. Identify the element and enter its ground-state condensed electron configuration:

1s^22s^22p^43s^1

[Ar]4s13d104p25p1

[Kr]5s24d25p1

1) If, in using a lead-acid battery to start a car, 1.00 g of Pb is consumed on the anode, how long will it take to recharge the battery, using a current of 0.500 amps, and turn the PbSO4 that was produced back into Pb?

2) The Energizer bunny in the television commercial "keeps going and going." What property of the battery (voltaic cell) is being featured in this commercial?

Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Mg2 ] = 0.799 M and [Sn2 ] = 0.0160 M. Standard reduction potentials can be found here.

Mg(s)+ Sn^2+ ---> Mg^2+ +Sn(s)

E= V units

Figure the percent of mass of Aminiuem nitrate (NH4)² NO3

Calculate the volume, in milliliters, of a solid that has a density of 7.142g/cm3 and a mass of 232.51g

The concept of energy charge is a very useful way to think about how ATP levels control pathway activity. Discuss the role of ATP in the glycolytic pathway (between glucose and pyruvate and/or lactate) with a focus on how energy charge would alter the pathway and how the pathway activity would alter energy charge. Include both general aspects and specific ATP use and generation.

Calculate the molar solubility in pure water for the following compound at 25°C, Ag₂SO₃ K_sp = 1.5x10^-14

What is the molar solubility in 0.0010 M sodium sulfite?  

The details of several steps in the particle-in a box middle in this chapter have been omitted. Work out the details of the following steps:

a.)Show that if Ψ =A sin rx + B cos sx (A, B, r, and s are constants) is a solution to the wave equation for the one- dimensional box, then r = s = (2mE)1/2(2π/h)

b.)Show that if Ψ= A sin rx, the boundary conditions (Ψ =0 when x=0 and x=a) require that r =± nπ/a, where n = any integer other than zero.

c.)Show that if r =±nπ/a, the energy levels of the particle are given by E =n2h2/8ma2.

d.)Show that substituting the value of r given in part c into Ψ =A sin rx and applying the normalizing requirement gives A=(2)1/2/a.

provide proper explanation for each and every part. last expert just copy and paste from book please do not copy ad paste elaborate each and every step with explanation.

A reaction proceeds by the following single-step mechanism: A → 2B + Cand the Arrhenius expression for the rate coefficient is k = (2.58x107 s−1) exp [−(34.25 kJ mol−1)/RT]

If the initial pressure of A is 0.100 bar in a fixed volume of 4.00 L, quantitatively plot the partial pressures of A, B, and C as a function of time at

(a) 300.0 K

(b) 400.0 K

Choose the time axis range (seconds) so that about 99% of A has decomposed.

write balanced, complete ionic and net ionic equations for each reaction a) hcl + LiOH_H2O + LiCl b) MgS + CuCl_ CuS + MgCl c) NaOH + HNO_ H2O + NaNo d) Na3PO4 + NiCl2_ Ni3(PO4)2 + NaCl

Organic Chemistry II: Please read the whole question and then answer with details and clear typing. NO HAND-WRITYNG PLEASE.

Not too long ago "free radicals" and quenching those "free radicals" was a big marketing push. We were told we needed to consume or apply antioxidants (in the marketed mixture of the day) in order to reverse or prevent free radical damage.

Please post a short description of an example of where some free radicals might originate and a potential antioxidant quench to eliminate them. Don't forget to discuss HOW the antioxidant would quench those radicals.

Your answer should be 150 words.

THE ANSWER MUST BE TYPED SO I CAN READ IT. PLEASE NO HAND-WRITING.