Exam 5 (chapters 7&8)

Question 1

What is wavelength? How is it represented and what are the units?

Answer 1

Wavelength is the distance between two consecutive peaks or troughs in a wave; Symbol: λ; units nm

Question 2

What is frequency? How is it represented and what are the units?

Answer 2

Frequency is the number of waves per second that pass a given point in space; symbol: v; units 1/s, s-1, Hz

Question 3

1 Hz = ? s-1

Answer 3

1 Hz = 1 s-1

Question 4

frequency and wavelength have a _____ relationship

Answer 4

inverse

Question 5

What equation do we use to relate frequency and wavelength

Answer 5

C= (λ)(v)

Question 6

In the equation C= (λ)(v) what does each symbol represent

Answer 6

C= the speed of light
λ= wavelength
v= frequency

Question 7

What is the constant used to express C (the speed of light)

Answer 7

2.998 x 10^8 m/s

Question 8

How can we rearrange the equation C= (λ)(v) to find frequency (v)

Answer 8

v = c/λ

Question 9

How can we rearrange the equation C=(λ)(v) to find wavelength (λ)

Answer 9

λ=c/v

Question 10

What equation can be used to calculate energy

Answer 10

E=hc/λ

Question 11

In the equation E=hc/λ what does h (planck’s constant) stand for

Answer 11

h= planck’s constant = 6.626 x 10^-34J

Question 12

going from red to violet E (energy) _______

Answer 12

Increases (ROY G BIV) —–>

Question 13

As E goes up V goes ______ and λ goes _______

Answer 13

v goes up; λ goes down

Question 14

what are energy levels

Answer 14

the allowed states that electrons occupy

Question 15

What is the ground state of an atom

Answer 15

the lowest energy level (n=1)

Question 16

What is an atoms excited state

Answer 16

anywhere where n is greater than 1

Question 17

What is electron transmission

Answer 17

movement of electrons between energy levels

Question 18

What is emission (what type of heat process, does is release E or require E, how is the E moving?)

Answer 18

exothermic, releases E, moving E from a higher level to a lower level

Question 19

What is Absorption (what type of heat process, does is release E or require E, how is the E moving?)

Answer 19

endothermic, requires E, moving E from a lower level to a higher level

Question 20

What equation do we use to calculate the change in E? (eg. moving from n=5 to n=3)

Answer 20

∆E = -Rh (1/n^2 final - 1/n^2 initial)

Question 21

In the equation