Energy and Development of Bohr Model & the Quantum Model

Question 1

Photoelectric Effect:

Answer 1

emission of e- from a metal when light shines on it

Question 2

Diff between red light and violet light?

Answer 2

Red light did not eject e- from metal and Violet ejects e- right away

Question 3

What happens if incoming light is not at a high enough energy?

Answer 3

electrons will not be ejected

Question 4

What did Max planck propose?

Answer 4

that light does not emit electromagnetic energy like wave but in small “packets” of energy called quanta

Question 5

Quantum of energy:

Answer 5

minimum amount of energy that can be lost/ gained by an atom

Question 6

If there is enough energy…

Answer 6

electron is ejected at certain frequency (gives off color)

Question 7

Energy formula:

Answer 7

E=hv
E(energy (J -joules)
h(plancks constant) -6.626x E-34 JxS
v (frequency (Hz)) - 1/s

Question 8

what did Albert Einstein propose?

Answer 8

that electromagnetic radiation has a dual wave-particle nature

Question 9

Photon:

Answer 9

particle of electromagnetic radiation haveing 0 mass + carrying quantum of energy

Question 10

Light-emission spectrum:

Answer 10

bands of light

Question 11

according to bohrs model, the e- …

Answer 11

can only circle nucleus in orbits w/ nothing in between

Question 12

Ground state:

Answer 12

atom exists at lowest energy level

Question 13

Excited state:

Answer 13

atoms absorb energy - electrons move from low energy level to a higher level

Question 14

Electrons emit energy at a frequency…

Answer 14

= to energy absorbed, and return to ground state

Question 15

Continuous Spectra: (white light)

Answer 15

continuously emitted lines of all colors

Question 16

Emission:

Answer 16

electrons emit energy + move back to ground state

Question 17

Absorbition:

Answer 17

electrons absorb energy and move to excited state

Question 18

The problem with Bohrs model was that what?

Answer 18

did not apply to elements with more than one electron only Hydrogen

Question 19

What did Louis De Brogile propose?

Answer 19

that an electron has wave-like properties

Question 20

What did Erwin Shrodinger develop?

Answer 20

and equation that treated electrons as waves

Question 21

What did Werner Heisenberg suggest that it was impossible to know?

Answer 21

where electron is located at all times

Question 22

The Heisenberg uncertainty principle:

Answer 22

it is impossible to determine both position/ speed of electron

Question 23

What is an electron?

Answer 23

a particle of matter that travels around nucleus as a wave

Question 24

Quantum theory:

Answer 24

describes mathematically the wave properties of e-

Question 25

Electrons exist in certain regions called:

Answer 25

orbitals

Question 26

orbital:

Answer 26

three dimensional region around nucleus that indicates location of e-