EL 2

Question 1

What is the acronym used to remember the order of the EM spectrum?

Answer 1

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Question 2

What happens as you go up the EM spectrum?

Answer 2

Frequency and energy increase
Wavelength decreases

Question 3

What produces a line spectra?

Answer 3

Transition between energy levels

Question 4

What does it mean if an atom is at ground state?

Answer 4

All electrons are at the lowest possible energy level

Question 5

What are the similarities between the absorption and emission spectra?

Answer 5

Similarities
- Lines of the same intensity
- Lines converge as frequency increases

Question 6

What are the black lines in a absorption spectrum?

Answer 6

Frequencies missing

Question 7

What are the coloured lines in the emission spectrum?

Answer 7

Energy produced by electrons dropping to lower levels

Question 8

E =

Answer 8

h x v
Plank’s constant x frequency

Question 9

C (speed of light) =

Answer 9

V x lamda
Frequency x wavelength

Question 10

KJ —> J

Answer 10

X 1000

Question 11

KJmol-1 —> J

Answer 11

X 1000 then / 6.02 x 10^23

Question 12

Cm —> m

Answer 12

/ 100

Question 13

Mm —> m

Answer 13

/ 1000

Question 14

Nm —> m

Answer 14

X 10^-9

Question 15

What do you do when you are asked for energy but have no frequency?

Answer 15

• Use equation V = C x lamda to calculate frequency
• substitute into E = h x v

Question 16

What are the differences between the absorption and emission spectra?

Answer 16

Differences
- Emission spectrum has a black background with coloured lines
- Absorption spectrum has a coloured background with black lines