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Ivan
3 years ago
9

What is the correct answer? please

Chemistry
1 answer:
Maslowich3 years ago
5 0

Answer:

The answer should be D

Explanation:

It states the simple weather conditions and such

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What is the wavelength in picometers for an electron with 360 eV of kinetic energy?
Rom4ik [11]

Answer:

Wavelength = 64.635 pm

Explanation:

The expression for the deBroglie wavelength and kinetic energy is:

\lambda=\frac {h}{\sqrt{2\times m\times K.E.}}

Where,  

\lambda is the deBroglie wavelength  

h is Plank's constant having value 6.626\times 10^{-34}\ Js

m is the mass of electron having value 9.11\times 10^{-31}\ kg

K.E. is the kinetic energy of the electron.

Given, K.E. = 360 eV

Energy in eV can be converted to energy in J as:

1 eV = 1.6022 × 10⁻¹⁹ J

So, K.E. = 360\times 1.6022\times 10^{-19}\ J=5.76792\times 10^{-17}\ J

Applying in the equation as:

\lambda=\frac {h}{\sqrt{2\times m\times K.E.}}

\lambda=\frac{6.626\times 10^{-34}}{\sqrt {{2\times 9.11\times 10^{-31}\times 5.76792\times 10^{-17}}}}\ m

\lambda=\frac{10^{-34}\times \:6.626}{\sqrt{10^{-48}\times \:105.0915024}}\ m

\lambda=6.4635\times 10^{-11}\ m

Also, 1 m = 10¹² pm

<u>So, Wavelength = 64.635 pm</u>

4 0
4 years ago
Identify this reaction <br> In pic
balu736 [363]

Answer:

Double displacement

Explanation:

5 0
3 years ago
How many neutrons are in a typical silicon atom?<br> A. 15<br> B. 14<br> C. 28<br> D. 42
Aleksandr [31]
Silicon (Si) atomic mass is 28.085.
To find the mass number of most common isotope we need to round atomic mas to wholes.
28.085≈28 is atomic mass
Atomic number(number of protons) is an ordinal number of an element in the Periodic Table.
 For silicons it is 14.
Mass number=number of protons(atomic number)+number of neutrons.
Number of neutrons=Mass number - Number of Protons(atomic number)
Number of neutrons= 28 - 14 = 14

Correct answer is B.14

7 0
3 years ago
Leandra is learning about chemical reactions and she wants to examine the information that is included in a chemical equation. W
anyanavicka [17]

Answer:

I d n

Explanation:

I d n

7 0
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A.<br><br> A una atmósfera de presión (1atm), ¿cuál es el punto de solidificación del agua?
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Answer:

ajansnnddndjsjjenrndndndndndndndnd

7 0
3 years ago
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