Chapter 2 Flashcards
1
Q
Electromagnetic radiation
A
- way energy travels through space
- a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.
2
Q
Electromagnetic spectrum
A
- ROYGBIV
- red to violet…….
1. radio waves
2. microwaves
3. infared radiation/ waves (thermal goggled used in army)
4. VISIBLE WAVES (7 x 10(-7) –> 4 x 10(-7)
5. UV rays (can cause skin cancer)
6. X-rays
7. Gamma Rays
3
Q
wavelength
A
- λ (lamda)
- the distance between 2 consecutive peaks or troughs in a wave
- part that repeats (peak to peak)
- measured by meters
4
Q
frequency
A
- ν (nu)
- number of waves (cycles) per second that pass a given point in space
- seconds
- hertz= SI unit of frequency
5
Q
c= λν
A
c= speed of light (2.9979 x 10 (8)
6
Q
photon
A
-quantum (small pocket of energy) of electromagnetic radiation
7
Q
E photon= hv= hc/λ
A
-h= Planck’s constant (6.626 x 10 (-34) Js)
8
Q
diffraction
A
-the scattering of light waves
9
Q
formulas………
A
-change in energy for a system.... ΔE = nhv -mass of energy..... m = E/c2 -mass of a photon of light...... m = h/λc -energy of each photon..... E photon= hv= hc/λ Atomic energy....... --2.18 x 10 (-18)J (z2/n2)
10
Q
continuous spectrum vs line spectrum
A
- continuous= shady; blend colors
- line= lines are distinct
- more electrons= more lines (further along the periodic table)–> electrons jumping form shell to shell)
- absorbing energy= electron jumps up
- releasing energy= electron jumps down
- colors= when electrons jump, they leave a color
11
Q
ionization energy
A
-the energy needed to remove an electron from a gaseous form
12
Q
electron affinity
A
-the energy change associated with the addition of an electron to a gaseous from
13
Q
atomic radii
A
- size of the atom
- the distance between the nuclei of 2 identical atoms
