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Talja [164]
3 years ago
5

Why might a scientist repeat an experiment if he/she did not make a mistake in the first one? An experiment should be repeated t

o A) increase income for increased work. B) prove how interesting the study was. C) ensure the results are accurate. Eliminate D) eliminate steps and save time.
Chemistry
2 answers:
makvit [3.9K]3 years ago
5 0

The answer is C. To ensure the results are accurate.

WINSTONCH [101]3 years ago
5 0

Answer: The answer is C.

Explanation: An experiment must be repeatable, so doing it multiple times can verify the work is correct.

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The pressure on 30 milliliters of an ideal gas increases from
Nana76 [90]

V1 = 30 mL

P1 = 760 torr

P2 = 1520 torr

V2 = ?

applying Boyle's Law

P1*V1 = P2*V2

760 torr * 30 mL = 1520 torr * V2

V2 = 760 torr * 30 mL / 1520 torr

( C ) is correct

8 0
3 years ago
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
What happens when atoms share electrons?
Anika [276]
When an atom shares electrons they form a covalent bond. 
4 0
3 years ago
4. Which of the following statements
Gnesinka [82]

Answer:

The answer is B

Explanation:

6 0
3 years ago
Read 2 more answers
In general, which properties are common to elements within a single group on the periodic table?
blsea [12.9K]
Almost all properties are common to elements within a single group on the periodic table. They react with water in the same way, they have the same number of valence electrons thereby having the same valency, the number of shells in the atom of the element increases by one as we move down the group. 

In general, they have the same chemical properties as chemical properties depend on the number of electrons in the valence shell i.e. the outermost shell in the atom of an element. 
7 0
3 years ago
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