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 ?
Wavelength, Frequency, & Energy of Light
Byno Chemistry 2013
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?
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
Visible light breaks into a spectrum of colors depending on the wavelength of the light
A spectroscope is a device used to separate the colors of visible light and measure their wavelengths
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
Groups 1 and 2, and Helium
Groups 13-18 (except Helium)
Transition metals – Groups 3-12
Lanthinide and Actinide series – Rare Earth Metals
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
Example: A helium laser emits light with a wavelength of 633 nm. What is the frequency of the light?
Speed of light (m/s)
The energy of the electron’s movement in a chemical reaction can be calculated
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
6.63 x 10-34 Js
Now that we know the wavelength, we can calculate the energy of the electron
c÷λ = ν
ν = 3.8x108 m/s ÷ 4.06x10-11 m
ν = 7.39x1018Hz
E = h × ν
E = 6.63x10-34 Js × 7.39x1018Hz
E = 4.9x10-15 J
What is the energy of light whose wavelength is 4.06 x 10-11 m?