qpt

This page lists questions and answers that were posted by visitors named qpt.

Questions

The following questions were asked by visitors named qpt.

H8P1: Polystyrene The monomer structure of polystyrene is shown below: (a) Would you expect polystyrene to be a stiff or a pliable polymer? I)Stiff II)Pliable (b) What kind of synthesis is used in the production of polystyrene from styrene monomers? I)Add...

Answers

The following answers were posted by visitors named qpt.

How did you get it? could you show the data in the formula? Thank you

Step 1: (0.5*6695.0 - 6695.0)/ (359.5 - 6695.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=38.0 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)

can someone give me a formula? and what data to use in the formula? thank you

Thank you for the info, great help

ξ= (0.5 * carbon concentration at the surface of the steel - carbon concentration at the surface of the steel)/ (carbon concentration in the steel before carburization - carbon concentration at the surface of the steel)

ξ= (0.5 * carbon concentration at the surface of the steel - carbon concentration at the surface of the steel)/ (carbon concentration in the steel before carburization - carbon concentration at the surface of the steel)

Step 1: ξ= (0.5 * carbon concentration at the surface of the steel - carbon concentration at the surface of the steel)/ (carbon concentration in the steel before carburization - carbon concentration at the surface of the steel) (0.5* 7215.0 - 7215.0 )/ (...

42.8 is wrong! could you input the data above into the formula? Thank you

Did not get it right! could you input the data above into the formula? Thank you

How did you convert kg/s to g/hr

Could someone give the formula and where the data is inserted?

Any ideas for b)

(a) 10^-12*27*(x)^4 replace x with the solubility you have 10^-12*27(4.891 x 10-3)^4 x=4.891x10^-3 (as taken from a)*is this the solubility 1.54509225456e-20 (it was wrong) What when wrong?

Still having problems with this one! Any thoughts!

Could someone insert the formula and data, at least it gives an idea in how-to answer the question?

Molar mass of PbO: 446.4 g/mol Molar mass of Pb: 621.6 g/mol (830000g/446.4)*621.6 = convert answer from g to kg

Any ideas for b) ?

a)3.03*10^-8 b) 2.14*10^-8 any ideas for c)?

Yup it gave me a big red X.

a) 6.22*10^18 No idea for b) any thoughts or how to for b)?

frequency(wavelength)=speed of light. solve for frquency.

How do you use the above data and insert into the formula?

how to convert j/mol to EV?

same here had 39.2 as the wrong answer.