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Chemistry Ch. 7-9 > Chapter 7 > Flashcards

Chapter 7 Flashcards

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1
Q

The vertical distance from the midline of a wave to the peak or trough

A

Amplitude

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2
Q

The number of waves that pass through a particular point in 1 second

A

Frequency

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3
Q

The speed of a wave

A

U = lamda x v

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4
Q

Proposed that visible light consist of electromagnetic waves

A

Maxwell 1873

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5
Q

In the visible light consist of electromagnetic waves…(2 components)

A

Electric field component and magnetic field component

Perpendicular to one another

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6
Q

The emission and transmission of energy in the form of electromagnetic waves

A

Electromagnetic radiation

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7
Q

Speed of light

A

3.00x10^8 m/s

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8
Q

What we can see small part of electromagnetic spectrum

400-700 nanometer

A

Visible light

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9
Q

Electro attic radiation

A

Lamda x v =c

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10
Q

A photon has a frequency of 6.0x10^4 Hz. Convert into wavelength

A

Lamda = c/v

3.00x10^8 m/s / 6.0x10^4 Hz

Convert to nanometer

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11
Q

What did max planch (1900) discover?

A

-when solids are heated, they emitted electromagnetic radiation over a wide range of wavelength

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12
Q

Radiant energy emitted by an object at a certain temperature depends on its____

A

Wavelength

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13
Q

Energy is emitted or absorbed in discrete units called____

A

Quantum

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14
Q

Planch’s constant

A

h=6.63x10^-34 Js

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15
Q

Photoelectric effect 1905

A
  • Einstein
  • metals emit electrons when exposed to light
  • light has both wave nature and particular nature
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16
Q

A particle of light

A

Photon

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17
Q

Finger prints for atoms

A

Line spectra

-excited by a high energy discharge, the light will pass through a prism

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18
Q

Bohr’s model of the atom 1913

A
  • electrons can only have specific (quantinize) energy values
  • light is emitted as electron moves from one energy level to a lower energy level
19
Q

En=-RH(1/n^2)

What is n and R?

A

R= rydburg constant 2.18x10^-18 J

n = principal quantum number - integers (1, infinity)

20
Q

4 scenes of transitions of the hydrogen atom from higher energy levels to lower energy levels

A

E (n=1) - Lymdn
E(n=2)- balmer
E(n=3)- paschen
E(n=4)- bracket

21
Q

wavelength can’t be _____

A

Negative

22
Q

Why is energy quantinized?

A

De broglie (1924) reasoned that electron is both particle and wave

h/mu

23
Q

Schrodinger wave equation

A

An equation that described both the particle and wave nature of the electron

24
Q

Schrodingers equation can only be exactly solved for ___ atoms. An approximate solution is used for multi electron systems.

A

Hydrogen

25
Q

Wave function:
1.
2.

A
  1. Energy of electrons with a given wave function

2. (Wave function (sigh))^2 is the probability of finding electrons in a volume of space

26
Q

Sigh is a function of 4 numbers called _____

A

Quantum numbers (n, l, m, ms)

m sub s

27
Q

Quantum number n =

A

Distance of electron from the nucleus

28
Q

90% of the electron density is found for the___

A

1s orbital

29
Q

Quantum number l=

A

Angular momentum quantum number

** l=n-1

30
Q

When n= 1
n=2
n=3

L=?

A

l= 0
l= 0 or 1
l=0,1 or 2

31
Q

l=0
l=1
l=2
l=3

What orbital?

A 
0 = s orbital
1= p orbital 
2= d orbital
3= f orbital
32
Q

L represents ….

A

Shape of the volume of space that the electron occupies

33
Q

Pauli exclusion principle

A

No 2 electrons in an atom can have the same 4 quantum numbers

34
Q

Electrons with the same value of n

A

She’ll

35
Q

Electrons with the same values of n and l

A

Subshell

36
Q

Electrons with the same values of n l and ml

A

Orbital

37
Q

How many electrons can an orbital hold?

A

2 electron (with opposite spin)

38
Q

“Fill up” electrons in lowest energy orbitals

A

Aufbau Principle

39
Q

The most stable arrangement of electrons in Subshell is the one with the greatest number of parallel spins

A

Hund’s rule

40
Q

What are the possible quantum numbers for the last (outermost) electron in Cl?

A

N=3
L=1
Ml=-1,0,1
Ms= 1/2, -1/2

41
Q

What is the electron configuration of Mg?

A

1s^2 2s^2 2p^6 3s^2

Abbreviation: [Ne] 3s^2

42
Q

Unpaired electrons

A

Paramagnetic

43
Q

All electrons paired

A

Diamagnetic

44
Q

The distance between identical points on successive waves

A

Wavelength (lamda)

Chemistry Ch. 7-9 (4 decks)

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