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Questions (32)
You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature.
4 answers
516 views
(a) The figure above shows how the energy of a system varies as a chemical reaction proceeds. Match the numbers features labeled
3 answers
1,055 views
The half-life of a first order reaction is determined to be 85.5 years. How long will it take for the concentration of the
13 answers
509 views
A formation energy of 1.11 eV is required to create a vacancy in a particular metal. At 777oC there is one vacancy for every
2 answers
583 views
How could one lower the glass transition temperature of a germate (GeO2) glass? Select all possible ways.
i)Increase the cooling
10 answers
627 views
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091X10^-2 atomic percent. Assuming that the concentration
18 answers
619 views
You are conducting experiments with your x-ray diffractometer.
(a) A specimen of molybdenum is exposed to a beam of monochromatic
15 answers
676 views
The diffusion coefficient of silver (Ag) in copper (Cu) has the following values:
T (K) D (m2s-1) 923 5.42 x 10-16 1173 1.34 x
8 answers
944 views
The glass panels of a sky roof need to be coated in order to screen out ultraviolet radiation (10-400 nm wavelength) but without
8 answers
720 views
(a) Identify the feature below using correct crystallographic notation.
i) (2 1 0) ii) (^-1 1/2 0) iii) (^-2 0 1) iv) (2 ^-1 0)
13 answers
596 views
Show that a conventional x-ray generator is incapable of generating x-rays of wavelength as low as 10-11m. Do this by
2 answers
559 views
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.31 kg m-3. Under these conditions the
21 answers
707 views
(a) Cadmium telluride (CdTe) is a semiconductor witha band gap, Eg, of 1.45 eV. Calculate the value of the absorption edge of
6 answers
899 views
You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature.
23 answers
743 views
Consider the gold-platinum system which has a value of delta w of -4250 J/mole;
(a) Calculate the enthalpy of mixing for a
4 answers
739 views
The fictitious compound, pandemonium carbonate Pn(CO3)2 hase a Ksp=3.091x10^-9M3 in water at room temperature. Calculate the
5 answers
657 views
Answer the following questions by referring to the Cu-Al phase diagram shown below.
(a) What is the lowest temperature at which a
11 answers
1,224 views
The solubility of the fictitious compound, administratium fluoride ( AdF3 ) in water is 3.091x10^-4M . Calculate the value of
2 answers
610 views
(a) The phase diagram of the binary system, neodymium-scandium ( Nd-Sc ) is given below. There are two polymorphs in the solid
5 answers
1,716 views
Question One
Lead chloride dissolves in water according to PbCl2(s)<-> Pb^2+ + 2Cl^- (aq) The solubility in pure water has been
8 answers
2,455 views
Question One
The fictitious compound, pandemonium fluoride ( PnF2 ) has a Ksp value in water of 3.091x10^-9 M^3 at room
3 answers
837 views
Question One:
Comment on the solubility of hydrogen ( H2 ) in liquid ammonia ( NH3 ). State whether you expect hydrogen to be
2 answers
1,060 views
Here is the phase diagram of water with attention given to phases at high pressure. Name all phases present at the markers 1, 2
2 answers
1,214 views
H6P8: Elongation
A steel cable 10 m long is pulled in tension with a stress of 350 MPa. Assume that the Young's modulus of the
2 answers
601 views
H6P7: Young's Modulus
Rank the following 3 classes of materials in order of increasing typical Young's Modulus: metals such as
4 answers
1,048 views
H6P6: Urbium Oxide
First Part of the Question: Urbium (Ur) is an upscale element found in big cities. Its oxide (UrO2) is not
6 answers
868 views
N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long
4 answers
909 views
Administratium bromide (AdBr) decomposes readily at temperatures exceeding 37°C. The figure below shows how the rate of
3 answers
686 views
The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is
7 answers
565 views
You have a single crystal of 100% pure gold. Identify which of the following defects you would expect to be present at room
3 answers
456 views
Metals yield at a stress much lower than those calculated on the basis of their bond strength alone. This is explained by the
3 answers
1,061 views
Name the following crystallographic features below using proper crystallographic notation.
Image One [2ˉ21] [1ˉ12ˉ]
6 answers
711 views
Answers (66)
a) 4.27 x 10^-6 b) 536.7
a) 11.13 b) 10.76
iv) Ti
a)Addition Polymerization b)14286 c) iii) isotactic
a) 2.9844 b)K2O = basic Al(OH)3 = amphoteric Si(OH)4 = acidic CaO = basic
a)vii:sp3d2 b)i:Slightly less than 90 c)4.13346*10^-7
Thank you
Thank you
a) Higher T b) Thermoplastic c) 5520
Thank you
a) stiff b) Addition polymerization c) 3.091×10^6 / 104.15 = 29678.34
Thank you Anonymous and Anonima
Thank you all.
Do you any idea to answer this question below, do give some input by providing data and how to with formula. A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.31 kg m-3. Under these conditions the total surface area of
Example:(remember to substitute with your data) 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
As its Si: 5.00*10^22 / (gallium level*10^-2) by someguy
74.5years X (multiply) with 5.64386
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* 8655.0 - 8655.0 )/ (
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* 6700.0 - 6700.0 )/ (
**We are here to help each other on this forum. Hope the info below helps'! 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 -
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* 7345.0 - 7345.0)/ (
Step 1: (0.5* 6155.0 - 6155.0)/ ( 211.5 - 6155.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=59.0 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)
how do I believe you?
(6.023*10^23)/(12.05)=m m*(3.091*10^-8)*(10^-2)=
(6.023*10^23)/(12.05)=m m*(3.091*10^-8)*(10^-2)=
(6.023*10^23)/(12.05)=m m*(3.091*10^-7)*(10^-2)=
(6.023*10^23)/(12.05)=m m*(3.091*10^-8)*(10^-2)=
(6.023*10^23)/(12.05)=m m*(3.091*10^-8)*(10^-2)=
Got the answer 297.622419061 hours.Thank you all for the advise, check through, and help, great way to make sure all of us don't use up our submissions. Again thank you bra, qwerty and yamy.
Thank you someguy
Thank you someguy
1.5455*10^19
As its Si: 5.00*10^22 / (gallium level*10^-2) by someguy
110
(b) II Specimen A should allow silver to diffuse more quickly due to its smaller grain size and increased grain boundary area.
a 7.23
840
Answer is: 193000
a) 7.23 b) 475 ev
Decrease the cooling rate. Add CaO to the glass melt.
The answer 1.598e14 was not right for me too. Any ideas what happen and how to write it out?
a)7.23 b)475
840
Thank you qwerty, Rufus for A)IV and Anonymous for B) VI
Thank you alex and babalovic for B)and anonim for A)
The answer 9.31 is not right can any give a formula.
110
The answer 1.598e14 was not right for me too. Any ideas what happen and how to write it out?
Thank you Anonima
Thank you anonymous
