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Wavelength, Frequency, & Energy of Light. Byno Chemistry 2013. Discuss in your group. Why does Aluminum not burn? Why does Alcohol burn but it will not react with anything else? Why does Aluminum react with Hydrochloric Acid ?

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Wavelength, Frequency, & Energy of Light

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Wavelength frequency energy of light

Wavelength, Frequency, & Energy of Light

Byno Chemistry 2013


Discuss in your group

Discuss in your group

Why does Aluminum not burn?

Why does Alcohol burn but it will not react with anything else?

Why does Aluminum react with Hydrochloric Acid?

Why does Calcium Carbonate react with vinegar, but it doesn’t burn?


I can

I can . . .

Identify and use the symbols for frequency and speed of light

Use 3x108 m/s as the value for the speed of light

Calculate E = hv using Planck’s constant

Calculate c = λv using the speed of light


Symbols

Symbols


Visible light

Visible Light

Visible light breaks into a spectrum of colors depending on the wavelength of the light


Spectroscope

Spectroscope

A spectroscope is a device used to separate the colors of visible light and measure their wavelengths


Electron energy levels

Electron Energy Levels

Electrons exist in the electron cloud but they can be found in distinct ‘levels’

They are the s-orbital, p-orbital, d-orbital, and f-orbital

Electrons can jump up from one orbital to the next when energy is applied to the atom


Ex cadmium

Ex. Cadmium


S orbital

S-Orbital

Groups 1 and 2, and Helium


P orbital

P-orbital

Groups 13-18 (except Helium)


D orbital

D-orbital

Transition metals – Groups 3-12


F orbital

F-orbital

Lanthinide and Actinide series – Rare Earth Metals


Electrons

Electrons

  • The motion of electrons in the electron cloud of an atom creates low energy waves such as visible light and radio waves

  • The energy is the result of electrons hopping from one level up to the next

  • Energy is emitted when the electron falls back to the original level


Reactivity

Reactivity

An element can react with another element if it has electrons that can move

When a chemical substance reacts with another, the electrons move and give off energy in the form of light


Wavelength

Wavelength

Example: A helium laser emits light with a wavelength of 633 nm. What is the frequency of the light?

Speed of light (m/s)

Frequency (Hz)

Wavelength

(m)

The energy of the electron’s movement in a chemical reaction can be calculated


Energy

Energy

Example: A helium laser emits light with a wavelength of 633 nm. What is the energy of its electrons?

We previously calculated frequency = 6.00Hz

Energy

(J)

h(Planck’s Constant)

Frequency

(Hz)

6.63 x 10-34 Js

Now that we know the wavelength, we can calculate the energy of the electron


Practice

Practice

c÷λ = ν

ν = 3.8x108 m/s ÷ 4.06x10-11 m

ν = 7.39x1018Hz

E = h × ν

E = 6.63x10-34 Js × 7.39x1018Hz

E = 4.9x10-15 J

What is the energy of light whose wavelength is 4.06 x 10-11 m?


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