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Flashcards in Chem Test 2 Deck (39):
1

nanometer

one billion of a meter (1E10^-9)

2

Electromagnetic Spectrum (from shortest wavelength to longest)

gamma, X-rays, UV, visible, IR, microwave, radio

3

Electromagnetic spectrum (from longest to shortest wavelength)

radio, microwave, IR, Visible, UV, X-Rays, Gamma rays

4

Wavelength (in nanometers) of visible

400-700 nm

5

Purple -- short or long?

short, 400 nm

6

Red -- short or long?

long, 700 nm

7

Red -->

IR-->Microwave-->Radio

8

<--Violet

UV, X-Rays, Gamma Rays

9

frequency (v) formula

speed of light (c) / wavelength (lambda) in meters

10

relationship between frequency and wavelength

inversely related

11

Energy (E) formula

(h*c) / wavelength (lambda) or h*v

12

speed of light

3 X 10^8 m*s^-1

13

Planck's Constant (h)

6.626 X 10^-34 Js

14

Energy's relationship to wavelength?

inversely proportional, as wavelength decreases energy increases

15

Green, Red, Violet, Yellow. In order of increasing energy per photon

violet > green > yellow > red

16

What happens to UV-C?

absorbed in the upper atmosphere, both oxygen and ozone absorb light of these wavelengths

17

O2 --> UV photon

2 O, O2 + O--> O3

18

Easier to break: O2 or O3

O3

19

Chapman Cycle

the first set of natural steady-state reactions proposed for stratospheric ozone, it includes chemical reactions for both ozone formation and decomposition

20

UV Index

<2 (low) to 11+ (high)

21

How is ozone formed? (Basic formula)

Energy + 3 O2

22

Formula for number of shared electrons?

Shared Electrons = Needed - Actual

23

Formula for formal Charge

FC = Valence - (# of electrons + 3 of bonds)

24

UV-B

280-320 nm, most UV-B is absorbed by O3 in the stratosphere

25

UV-A

320-400least damaging, reaches Earth's surface in greatest amount

26

Incomplete Octet

B - needs 6, Be - 4, H - 2

27

Dobson Units

amount of UV radiation reaching a detector at ground level is correlated to the amount of ozone in column

28

frequency unit

1/s, Hertz

29

c = ... (in terms of v and lambda)

v * lambda

30

when will molecular geometries be different?

When there are lone pairs on the central atom

31

3 electron regions

trigonal planar

32

4 electron regions

tetrahedral

33

5 electron regions

trigonal bipyramidal

34

6 electron regions

octahedral

35

unit for molar mass?

g/mol

36

1 mol =

Element's grams

37

Avogadro's

6.02E23

38

Using Avogadro's

6.02E23 atoms = 1 mol

39

Most carbon found where?

in deep oceans