chapter 9 nuclear energy i. radioactivity (pg.284-292) i. radioactivity (pg.284-292)
TRANSCRIPT
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CHAPTER 9
Nuclear Energy
CHAPTER 9
Nuclear Energy
I. RadioactivityI. Radioactivity(pg.284-292)
I. RadioactivityI. Radioactivity(pg.284-292)
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Radioactive ElementsRadioactive ElementsRadioactive ElementsRadioactive Elements
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A. DefinitionsA. DefinitionsA. DefinitionsA. Definitions
Radioactivity Process of unstable nuclei of
elements becoming stable through emitting particles or releasing energy away from the atom
Also called nuclear decay
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DefinitionsDefinitionsDefinitionsDefinitions
During nuclear decay, the element can transform into a different isotope of the same element or to a different element completely.
Transmutation process of changing one element into
another element by nuclear decay
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DefinitionsDefinitionsDefinitionsDefinitions
Nuclear radiation is the released energy and matter during nuclear decay.
This can have both positive and negative effects for life on earth.
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DefinitionsDefinitionsDefinitionsDefinitions
Isotopes – elements that have the same number of protons but different number of neutrons in their nuclei.
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IsotopesIsotopesIsotopesIsotopes
Carbon-12, Carbon-13, Carbon-14
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Where does this take Where does this take place?place?
Where does this take Where does this take place?place?
Radioactivity (nuclear decay) happens in the nucleus of the atom.
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He42
B. Types of RadiationB. Types of RadiationB. Types of RadiationB. Types of Radiation
Alpha () helium nucleus paper2+
Beta-minus (-) electron e0
-11- plastic
Gamma () high-energy photon 0 lead
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Types of RadiationTypes of RadiationTypes of RadiationTypes of Radiation
Neutron emission (n) 1
0 n 0 charge
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C. Nuclear DecayC. Nuclear DecayC. Nuclear DecayC. Nuclear Decay
Why some nuclei decay… to obtain a stable ratio of neutrons to protons
K
K4019
3919
Stable
Unstable(radioactive)
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C. Nuclear DecayC. Nuclear DecayC. Nuclear DecayC. Nuclear Decay
Alpha Emission
He Th U 42
23490
23892
Beta Emission
e Xe I 0-1
13154
13153
TRANSMUTATIONTRANSMUTATIONTRANSMUTATIONTRANSMUTATION
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ExampleExampleExampleExample
Actinium-217 decays by releasing an alpha particle. Write the equation for this decay process and determine what element is formed.
Step 1: Write the equation with the original element on the reactant side and products on the right side.
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ExampleExampleExampleExample
217 A 4
89 Ac Z X + 2 He Step 2: Write math equations for the atomic
and mass numbers.217 = A + 489 = Z + 2
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ExampleExampleExampleExample
Step 3: Rearrange the equations.
A = 217 – 4 Z = 89 - 2
Step 4:Solve for the unknown value, and rewrite the equation with all nuclei.
A = 213 Z = 87
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ExampleExampleExampleExample
217 213 4
89 Ac 87 Fr + 2 He
This is an example of alpha decay.
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D. Half-lifeD. Half-lifeD. Half-lifeD. Half-life
Half-life (t½)
time it takes for half of the radioactive nuclei in a sample to decay
Nuclear Decay
0
2
4
6
8
10
12
14
16
18
20
0 2 4 6 8 10
# of Half-Lives
Ma
ss
of
Iso
top
es
(g
)
Example Half-lives
polonium-194 0.7 seconds
lead-212 10.6 hours
iodine-131 8.04 days
carbon-14 5,370 years
uranium-238 4.5 billion years
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Half-lifeHalf-lifeHalf-lifeHalf-life
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If we start out with 1 gram of the parent isotope, after the passage of 1 half-life, there will be 0.5 gram of the parent isotope left.
If we start out with 1 gram of the parent isotope, after the passage of 1 half-life, there will be 0.5 gram of the parent isotope left.
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D. Half-lifeD. Half-lifeD. Half-lifeD. Half-life How much of a 20-g sample of sodium-24 would
remain after decaying for 30 hours? Sodium-24 has a half-life of 15 hours.
GIVEN:
total time = 30 hours
t1/2 = 15 hours
original mass = 20 g
WORK:
number of half-lives = 2
20 g ÷ 2 = 10 g (1 half-life)
10 g ÷ 2 = 5 g (2 half-lives)
5 g of 24Na would remain.
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Nuclear ForcesNuclear ForcesNuclear ForcesNuclear Forces
There are two types of forces in the nucleus.
•Strong nuclear force – helps attract the protons and neutrons in the nucleus and keep them together.
•Repulsive force- protons repel each other because they are the same charge
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Nuclear ForcesNuclear ForcesNuclear ForcesNuclear Forces
In stable atoms, the attractive forces are stronger than the repulsive forces.
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A. FA. F issionissionA. FA. F issionission
splitting a nucleus into two or more smaller nuclei
some mass is converted to large amounts of energy
n3 Kr Ba U n 10
9236
14156
23592
10
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A. FA. F issionissionA. FA. F issionission
chain reaction - self-feeding reaction
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FissionFissionFissionFission
Chain reactions can be controlled and used to create electricity in nuclear power plants.
The minimum amount of a substance that can undergo a fission reaction and sustain a chain reaction is called critical mass.
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B. FusionB. FusionB. FusionB. Fusion
combining of two nuclei to form one nucleus of larger massproduces even more
energy than fissionoccurs naturally in
stars
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FusionFusionFusionFusion
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Nuclear Radiation in LifeNuclear Radiation in LifeNuclear Radiation in LifeNuclear Radiation in Life
Background radiation is nuclear radiation that is around you from natural sources like the sun, soil, rocks, and space.
A rem or millirem (1 rem = 1000millirems) is the unit for radiation.
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Nuclear Radiation in Life Nuclear Radiation in Life Nuclear Radiation in Life Nuclear Radiation in Life
A safe limit is set at 5000 millirems/year.
Occupation – X-ray tech, flight attendant
Where you live- high elevation, near rocks
Activities - smoking
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A. Nuclear PowerA. Nuclear PowerA. Nuclear PowerA. Nuclear Power
Fission Reactors
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A. Nuclear PowerA. Nuclear PowerA. Nuclear PowerA. Nuclear Power
Fusion Reactors (not yet sustainable)
Tokamak Fusion Test Reactor
Princeton University
National Spherical Torus Experiment
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A. Nuclear PowerA. Nuclear PowerA. Nuclear PowerA. Nuclear Power
235U is limited danger of meltdown toxic waste thermal pollution
Hydrogen is abundant no danger of meltdown no toxic waste not yet sustainable
FISSION
FUSION
vs.
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Other benefits to Other benefits to radiationradiation
Other benefits to Other benefits to radiationradiation
Smoke detectorsDisease detectionUltra soundCT scanMRICancer treatment