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Allushta [10]
3 years ago
5

ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST

Chemistry
2 answers:
NISA [10]3 years ago
5 0

Answer:

☟︎︎︎☟︎︎︎☟︎︎︎☟︎︎︎☟︎︎︎☟︎︎︎

Explanation:

According to Planck: E=h[latex]\nu[/latex], where h is Planck's constant (6.62606957(29) x 10-34 J s), ν is the frequency, and E is energy of an electromagnetic wave.

aniked [119]3 years ago
4 0

b

the color of lines

Explanation:

on the atomic spectrum for an atom

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This is a mixture that has the same composition throughout.
FinnZ [79.3K]

Answer: Homogeneous mixture

Explanation:

Homogeneous mixtures are those mixtures in which the dispersed phase is uniformly distributed throughout the dispersion medium. The dispersed phase has uniform composition throughout the dispersion medium and thus there is no physical boundary between the dispersed phase and the dispersion medium. Example: salt in water

Heterogeneous mixtures are those mixtures in which the dispersed phase is not uniformly distributed throughout the dispersion medium. The dispersed phase does not has uniform composition throughout the dispersion medium and thus there is a distinct physical boundary between the dispersed phase and the dispersion medium. Example: Sand in water

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3 years ago
What do the valence of electrons tell you?
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Answer:

valence electrons are the electrons that are located in the outermost electron shell of an element. Knowing how to find the number of valence electrons in a particular atom is an important skill for chemists because this information determines the kinds of chemical bonds that it can form and, therefore, the element's reactivity

Explanation:

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3 years ago
I need help! Please give me an answer
Zepler [3.9K]
You need to show us what you’re talking about first
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3 years ago
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A chemist wishing to do an experiment requiring 47-Ca2+ (half-life = 4.5 days) needs 5.0 μg of the nuclide. What mass of 47-CaCO
NARA [144]

Answer:

5.8μg

Explanation:

According to the rate or decay law:

N/N₀ = exp(-λt)------------------------------- (1)

Where N = Current quantity,  μg

            N₀ = Original quantity, μg

             λ= Decay constant day⁻¹

              t =  time in days

Since the half life is 4.5 days, we can calculate the  λ from (1) by  substituting N/N₀ = 0.5

0.5 = exp (-4.5λ)

ln 0.5  = -4.5λ

-0.6931 = -4.5λ

λ =   -0.6931 /-4.5

  =0.1540 day⁻¹

Substituting into (1)  we have :

N/N₀ = exp(-0.154t)----------------------------- (2)

To receive 5.0 μg of the nuclide with a delivery time of 24 hours or 1 day:

N = 5.0 μg

N₀ = Unknown

t = 1 day

Substituting into (2) we have

[5/N₀]   = exp (-0.154 x 1)

    5/N₀        = 0.8572

N₀  =  5/0.8572

     =    5.8329μg

    ≈     5.8μg

The Chemist must order 5.8μg  of 47-CaCO3

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3 years ago
If a system requires 150 J of input work and produces 123 J of output work, what's its efficiency? A. 72% B. 122% C. 82% D. 92%
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