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chemistryyyy > Ch301 Test #1 Ep 5-8 > Flashcards

Ch301 Test #1 Ep 5-8 Flashcards

1
Q

What is the photo electric effect

A

Shining light (usually UV) onto metal surface in vacuum could cause e- to be ejected from metal surface if it’s on or above the metals threshold frequency

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2
Q

What is the work function

A

Amount of E required to remove ONE e- from metals surface in a vacuum

always a small amount of E no matter the metal

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3
Q

If hv<Φ

A

Then there is not enough E to remove an e- from the metal

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4
Q

If hv> Φ

A

Then there is enough E to remove an e- from the metal in the vacuum

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5
Q

What happens if you increase the brightness of the light

PE

A

Ejects more electrons but they have the same KE as b4

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6
Q

What happens if you increase the freuqncy (hertz) of the light?

A

Same number of electrons are ejected but with a higher KE

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7
Q

Einstein explanation of light

A

Light acts like tiny particles or wave packets, each packet ejected one e-

Einstein is wrong and right because light doesn’t only behave like a particle

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8
Q

What’s is the relationship w E of light and frequency

A

Higher frequency means the light particle has more E

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9
Q

Which has greater E

Red or blue light

A

Blue light

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10
Q

Ephoton equation

A

Ephoton = Φ + KEelctron

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11
Q

In the PE effect high E photons can do what?

A

Remove an e- from almost anythang whether in a vacuum or not

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12
Q

Wave particle duality

A

Energy waves can also be energy particles

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13
Q

Louis Debroglie theory

A

Matter particles can also be matter waves

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14
Q

Debroglie equation

A

λ=h/mV

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15
Q

Schrödinger theory

A

Created math model that treats e- as waves instead of particles,

A standing matter wave around the nucleus

Each following subshell has higher E than before

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16
Q

What’s do Energies tell us(Schrödinger equaiton)

A

E of e-

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17
Q

What do wave functions tell us?(Schrödinger equation)

A

Tell us probability of finding the e- at a given position

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18
Q

What are the regions in space e- are found

A

Orbitals

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19
Q

Can we ever know exactly where e- are?

A

No but we can find probability of finding e- at any given distance from the nucleus

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20
Q

S orbital shape

A

One big circle

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21
Q

P orbital shape

A

2 half circles

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22
Q

D orbitals shape

A

4 quarter circles

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23
Q

Graph of likelihood of finding the e- vs the distance from the nucleus is called…

A

Radial distribution function

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24
Q

What are quantum numbers

A

The “address” of the e-

25
Q

What’s re the 4quantum numbers

A

N
l
ml
ms

26
Q

What’s does the quantum number l tell us

A

The shape of each orbital for each e-

27
Q

Pauli exclusion principle

A

In a given atom no 2 e- can have the same set of 4 quantum numbers

An orbital can hold a max of 2 e- and they must have opp spins

28
Q

What does n quantum number determine

A

Size and E of orbital

29
Q

What does ml quantum number determine

A

Orientation of orbital
Distinguishes between diff orbitals in same sub shell

30
Q

What does ms quantum number determine

A

Spin on the e-

31
Q

When does it take more E to remove an e-?

A

When its from a metal w a higher min threshold frequency

32
Q

Altering light brightness alter

A

Number of e-

33
Q

Altering light frequency alters?

A

KE

34
Q

When choosing solutions for electron config we f always chose

A

Lowest E solutions

35
Q

What is l for s subshell

A

0

36
Q

What is l for p subshell

A

1

37
Q

What is l for d subshell

A

2

38
Q

What is l for f subshell

A

3

39
Q

How to find the ml, magnetic quantum number?

A

Any Values ranging from -l to +l

0 always works

40
Q

How to find spin magnetic, ms?

A

Always be consistent

Make up arrow positive and down arrow negative

41
Q

Energy level ,n,for s block?

A

Same as row that e- is in

41
Q

Energy level ,n,for p block?

A

Same as row that e- is in

42
Q

Energy level ,n,for d block?

A

1 less than row that e- is in in d block

43
Q

Energy level ,n,for f block?

A

2 less than row that e- is in in f block

44
Q

What happned if you change energy of light

A

Increased KE

45
Q

What happens if you increase the intensity

A

Same KE but more electrons ejected

46
Q

Zeff = ?

A

Z(atomic #) - number of inner shell e-

47
Q

Formula speed of wave

A

Wavelength times frequency

48
Q

What is MHz

A

Megahertz is 10^6 hertz

49
Q

Define quantized

A

Can only have specific values, like atomic line emission spectra

50
Q

What does low frequency mean

A

Hi wavelength

51
Q

only use final and initial for??

A

Change in e,
Otherwise smallest is first then largest

52
Q

When electrons are removed in IE , in which order are they removed?

A

Highest to lowest E

53
Q

Which has higher E d subshell or s subshell

A

S subshell

54
Q

3s and 3p subshells are degenerate in E for

A

One electron systems

55
Q

What is the visible light wavelength range in nm

A

400-700 nm

56
Q

If a full spectrum of vis light passes thru a cloud cold hydrogen atoms before reaching earth, what would the vis spectrum from the star look to earth

A

Full vis spectrum w 4 wavelengths and rest of spectrum missing

57
Q

Mole concept is important to chem because

A

It allows us to count atoms and molecules by weighing macroscopic amounts of material

chemistryyyy (40 decks)

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