Chem final- exam 1 ch2

Question 1

Calculate wavelength, frequency, energy

Answer 1

E =hv -KNOW VELOCITY
E = hc/ lamda -KNOW WAVELENGHT

E= energy (J)
h= planks constant (Js)
lamda = wavelength (nm or m)
c = speed of light (m/s)
v= frequency (hz)

Question 2

Planks constant

Answer 2

6.626 * 10^-34 Js

Question 3

Speed of light

Answer 3

2.998 * 10^8 m/s

Question 4

Frequency equation

Answer 4

v =c/lamda

Question 5

Wavelength of waves

Answer 5

-Distance between 2 executive crests

Question 6

Frequency of waves

Answer 6

-Number of wave cycles that pass a point in 1 second

Question 7

Wavelength, frequency, and energy relationship

Answer 7

-Wavelength down
-Frequency up
-Energy up

Question 8

Wavelength colors

Answer 8

-Red: 750nm (safe)
-Blue: 400nm (unsafe)

Question 9

Order of electromagnetic spectrum safe to unsafe

Answer 9

-Radio/tv: 700nm
-Microwaves radar
-Infrared rays
-Visible
-Ultraviolet
-X rays
-Gamma rays: 400nm

Question 10

Wave particle duality

Answer 10

Light exhibits wave like and particle like properties

Question 11

Photoelectric effect

Answer 11

-Light shining on a metal surface ejectors an electron

Question 12

Rydberg Balmer equation

Answer 12

1/lamda = R (1/n1^2 - 1/n2^2)

n= 3,4,5,6

GIVES m THEN HAS TO CONVERT TO nm

Question 13

UV light catastrophe

Answer 13

-Something cant have infinite energy
-Energy comes in discrete amounts (Plank)

Question 14

Higher n numbers

Answer 14

-Lower energy change

Question 15

Bohr model

Answer 15

-Shells 1,2,3…
-Wrong bc electrons exist in clouds

Question 16

DeBrogolies wavelength equation

Answer 16

Lamda = h/mv

m = mass of particle (kg)
v = velocity (m/s)

Question 17

Heisenberg uncertainty

Answer 17

-Its impossible to determine position and velocity at a given moment

Question 18

S orbital

Answer 18

-circular

Question 19

P orbital

Answer 19

-2 balloons
-3 planes

Question 20

D orbital

Answer 20

-4 lobes
-All on one plane

Question 21

Nodes

Answer 21

-No electrons found

Question 22

Principle quantum number

Answer 22

-n
-Size and energy
-As n goes up, energy goes up
-1,2,3,4

Question 23

Angular momentum number

Answer 23

-l
-Define shape
-l=0 to n-1
0 =s, 1=p, 2=d, 3=f

Question 24

magnetic quantum number

Answer 24

-ml
-Defines spacial orientation
-ml= -l,0,+l

Question 25

Photons

Answer 25

Photons = overall energy/energy of photon