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3 years ago

Which must be true when work is done on an object resting object and the object moves?

Chemistry

1 answer:

Alecsey [184]3 years ago

4 0

The object would theoretically keep moving because of Newton's law of inertia.

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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

On the pH scale higher numbers indicate ?

mote1985 [20]

Answer:

Higher numbers indicate bases- not acidic/less acidic

Explanation:

6 0

3 years ago

Read 2 more answers

It is the one in the middle i listened to the first person and i got it wrong by the way this is the answer for edge2020 sience

Anna11 [10]

Answer:

for what school? It's different for all sadly :(

Explanation:

6 0

3 years ago

If you answer both question i will give brailest<br>20 points

spayn [35]

Answer:1. C

2.A

Explanation:

6 0

3 years ago

What is the formula for pH?

netineya [11]

Answer:

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].

Example: Find the pH of a 0.0025 M HCl solution.

4 0

3 years ago