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marysya [2.9K]
3 years ago
12

HELPPPPPPPPPP. PLZZZZ

Chemistry
1 answer:
balandron [24]3 years ago
5 0

i need help on myn to

its the 2nd tide i think

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What year did mendeleev organized his periodic table in order of increasing atomic number
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Mendeleev organized his periodic table in order of increasing atomic number in 1869.

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Define: 1. acids, 2. strong acids, 3. weak acids.
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H^+ = acid
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Acids have a pH of below 7. The lower the number, the strongest the acid.
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Is there a mathematical pattern in the number of
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The orbital shapes are actually representation of (Ψ)2 all over the orbit simplified ... ψnlml(r,θ,ϕ)=Rnl(r)Ymll(θ,ϕ) , ... and thus it is directly linked to the angular and radial nodes. ... for different quantum values(which can be assigned to different orbitals are ) .... The two types of nodes are angular and radial.

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If aluminum is diffused into a thick slice of silicon with no previous aluminum in it at a temperature of 1100˚C for 8 hours, wh
RideAnS [48]

Answer:

8.354 nanometers

Explanation:

To treat a diffusive process in function of time and distance we need to solve  2nd Ficks Law. This a partial differential equation, with certain condition the solution looks like this:

\frac{C_{s}-C{x}}{C_{s}-C_{o}}=erf(x/2\sqrt{D*t})

Where Cs is the concentration in the surface of the solid

Cx is the concentration at certain deep X

Co is the initial concentration of solute in the solid

and erf is the error function

Then we solve right side,

\frac{C_{s}-C{x}}{C_{s}-C_{o}}=\frac{1018atoms/cm3-1016atoms/cm3}{1018atoms/cm3}=0.001964

And we need to look up the inverse error function of 0.001964 resulting in: 0.00174055

Then we solve for x:

x=0.00174055*2*\sqrt{D*t} =0.00174055*2*\sqrt{2*10^{-12}cm^{2}/s*8h*3600s/h}=8.35464*10^{-7}cm

6 0
3 years ago
HELP ME ON NUMBER 8 ASAP
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Answer:

2. hope it helps. please follow me I'm new here

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