1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Maslowich
2 years ago
10

Can someone help me please I would really appreciated

Chemistry
1 answer:
harina [27]2 years ago
3 0

Explanation:

whats the question. cause I didn't see it

You might be interested in
For ___, 2 lobes have positive signs while the other 2 have negative signs, showing that the opposite lobes of have same sign.​
notsponge [240]

Answer:d orbitals

Explanation: just trustme

4 0
3 years ago
determine the frequency and wavelength (in nm) of the light emitted when the e- fell from n=4 and n=2
Lostsunrise [7]

Answer:

Frequency = 6.16 ×10¹⁴ Hz

λ = 4.87×10² nm

Explanation:

In case of hydrogen atom energy associated with nth state is,

En =  -13.6/n²

For n = 2

E₂ = -13.6 / 2²

E₂ = -13.6/4

E₂ = -3.4 ev

Kinetic energy of electron = -E₂ = 3.4 ev

For n = 4

E₄ = -13.6 / 4²

E₄ = -13.6/16

E₄ = -0.85 ev

Kinetic energy of electron = -E₄ = 0.85 ev

Wavelength of radiation emitted:

E = hc/λ = E₄ - E₂

hc/λ = E₄ - E₂

by putting values,

6.63×10⁻³⁴Js × 3×10⁸m/s / λ = -0.85ev   - (-3.4ev )

6.63×10⁻³⁴ Js× 3×10⁸m/s / λ = 2.55 ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 4.08×10⁻¹⁹ J

λ = 4.87×10⁻⁷ m

m to nm:

4.87×10⁻⁷ m ×10⁹nm/1 m

4.87×10² nm

Frequency:

Frequency = speed of electron / wavelength

by putting values,

Frequency = 3×10⁸m/s /4.87×10⁻⁷ m

Frequency = 6.16 ×10¹⁴ s⁻¹

s⁻¹ = Hz

Frequency = 6.16 ×10¹⁴ Hz

3 0
3 years ago
Consider the car driving around a circular track .Once stated,the driver maintains a speed 0f 45m/h.Compare the driver's velocit
Lyrx [107]
A i hope that helped i love you guys have a great day
And merry chrismas

6 0
3 years ago
Which properties represent a metal ( select all that apply )
blagie [28]

Malleable, shiny and good conductors
A B E
4 0
2 years ago
The term used by meteorologists for predicting the we ather is
Zielflug [23.3K]
<span>The term used by meteorologists for predicting the we ather is </span>forecasting
3 0
3 years ago
Read 2 more answers
Other questions:
  • Use the equation to determine what mass of FeS must react to form 326 g of FeCl2.
    7·1 answer
  • Water has a density of 0.997 g/cm^3 at 25 degrees C; ice has a density of 0.917 g/cm^3 at -10 degrees C. (question part a) If a
    8·2 answers
  • Each incomplete reaction is a neutralization reaction Match each equation with the salt formed,
    5·2 answers
  • For the following reaction, 5.05 grams of copper are mixed with excess silver nitrate. The reaction yields 11.0 grams of copper(
    9·1 answer
  • Which is the correctly balanced chemical equation for the reaction of KOH and H2SO4?
    15·1 answer
  • Which of the following statement regarding convection is WRONG? Select one: a. Contribution due to random molecular motion reduc
    11·1 answer
  • The number of molecules in 1.0 mole of h2o is the same as in one mole of o2.
    9·1 answer
  • Which alkaline earth metal is the components of quick lime​
    12·2 answers
  • A force that is opposite to motion of a falling object?
    12·1 answer
  • "What are 2 parts that plants and animals both have?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!