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Chemistry > Chapter 4 > Flashcards

Chapter 4 Flashcards

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1
Q

electromagnetic radiation

A

form of energy that exhibits wavelike behavior as it travels through space

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2
Q

What direction do electric field waves travel?

A

up and down

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3
Q

What direction do magnetic field waves travel?

A

side to side

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4
Q

What are the four characteristics of waves?

A

amplitude, wavelength, frequency, speed

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5
Q

amplitude

A

height/ energy

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6
Q

wavelength

A

length of a wave

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7
Q

frequency

A

number of cycles per second

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8
Q

speed

A

distance per second

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9
Q

What is the electromagnetic spectrum order?

A

gamma > x-ray > ultraviolet > visible > infrared > micro > tv > radio

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10
Q

What is the order of colors according to length of wavelength? (least to greatest)

A

vibgyor

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11
Q

What happens as you go from purple to red?

A

wavelength increases, frequency decreases, energy decreases

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12
Q

What is the equation for speed?

A

c = λ x v

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13
Q

Planck’s theory

A

there is a restriction on how much energy an object can emit or absorb

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14
Q

What is Planck’s theory also known as?

A

quantum-fixed amount

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15
Q

What is the amount of energy an object can emit or absorb?

A

a quantum

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16
Q

quantum

A

little packet of energy

17
Q

photoelectric effect

A

electrons ejected from metal when light shines on it

18
Q

What was Einstein’s experiment?

A

he shined different colors of light on Na in an attempt to release an electron; red light didn’t release an electron, but violet light did

19
Q

Why didn’t red light release an electron?

A

it didn’t have a high enough frequency; intensity doesn’t matter

20
Q

photon

A

quantum; bundle of energy

21
Q

Compton effect

A

showed photon could collide with electrons the way balls collide

22
Q

light behaves like a ___ and a ____

A

wave and particle

23
Q

line spectrum

A

contains only certain colors or wavelengths

24
Q

continuous spectrum

A

contains all colors

25
Q

Bohr model

A

an electron can only have certain orbits corresponding to different energy levels

26
Q

quantum number

A

labels orbits

27
Q

What is the ground state? What are the excited states?

A

ground state is n=1; excited state is n=2, n=3, etc

28
Q

How does an electron become excited?

A

it absorbs radiation

29
Q

What happens once an electron becomes excited?

A

the electron falls back to its ground state and emits radiation according to different energies of each quantum level

30
Q

Heisenberg’s Uncertainty Principle

A

you can’t know position and momentum of a moving object at the same time

Chemistry (8 decks)

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