Arrange the following reaction in order of increasing S value.

1. H2(g) + F2(g) 2HF(g)

2. NH4NO3(s) N2O(g) + 2H2O(I)

3. (NH4)2 Cr2O7(s) Cr2O3(s) + 4H2O(I) +N2(g)

How do 'coupled reactions' allow life (as a biochemical process) to exist?

A) How many grams of solid sodium fluoride should be added to 2.00 L of a 0.190 M hydrofluoric acid solution to prepare a buffer with a pH of 2.425 ?

grams sodium fluoride = g.

B)   How many grams of solid sodium fluoride should be added to 1.00 L of a 0.299 M hydrofluoric acid solution to prepare a buffer with a pH of 3.825 ?

grams sodium fluoride = g.

C) How many grams of solid ammonium bromide should be added to 1.00 L of a 9.88×10^-2 M ammonia solution to prepare a buffer with a pH of 10.080?  

grams ammonium bromide = g.

I was analyzing the sample in Agilent HPLC

and I got 3 peaks at 3.654min, 4.540min and 7.839min with 0.1175, 0.1366 and 0.1571 width values

anyone knows how to calculate N value (#of plates), retention factor, selectivity factor and resolution value for this chromatograms?

1. How would the reaction be affected if bromoethane were used instead of iodoethane?

2. How would the reaction be affected if 2-iodopropane were used instead of iodoethane?

experiment: http://legacy.earlham.edu/~seuka/Biochemistry/Ex.%2007%20Saccharin%20Alkylation.pdf

what is the new PH of a solution if 10ml of 0.1 M Hcl is added to 150ml of a buffer system that is 0.1M Benzoic acid and 0.1M sodium benzoate ( the Ka of benzoic acid is 6.3X10^-5). Thanks

​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