7.2 Half-Life
What will we learn?
-What are daughter isotopes?
-What is the decay curve?
-What is half-life?
-What are par...
Half-Life is the time it takes for half of the
mass of a substance to decay.
Shows the rate of radioactive decay for diffe...
A decay curve shows the decay rate for
radioisotopes
Graphing any isotope’s decay rate will produce the
same curve, the on...
The parent isotope = isotope that undergoes radioactive decay
The daughter isotope = stable product of radioactive decay
I...
This is the method used to date organic material
Uses the isotope carbon-14, which has a half-life
of 5730 years, and deca...
7.2 Quiz
1. How much of a sample of 100g of Carbon-14 will
be left after 22920 years?
a) 50g b) 25g c) 12.5g d) 6.25g
2. W...
7.2 Answers
1. How much of a sample of 100g of Carbon-14 will
be left after 22920 years?
a) 50g b) 25g c) 12.5g d) 6.25g
2...
Video:
7.3 Nuclear Reactions
What will we learn?
-What is a chain reaction?
-What is fission?
-What is fusion?
-What is a nuclear...
Nuclear Fission
The splitting of a nuclei into two smaller nuclei,
subatomic particles and energy
Heavy nuclei are unstabl...
Nuclear Fusion
The joining of two nuclei to form a larger nuclei
Happens in the core of stars
Requires high pressure and t...
Nuclear Reaction
A reaction that changes the nucleus of an atom
Gains or releases particles or energy
Can release electron...
Chain Reaction
One reaction starts the next reaction
Reaction continues on its own
Releases a large amount of energy, poss...
Nuclear Equation
Sum of mass numbers on both sides of the
equation must be equal
Sum of charges/atomic numbers on both sid...
7.3 Quiz
1. What is the missing atomic mass?
a) 6 b) 7 c) 14 d) 15
2. What is the missing atomic number?
a) 92 b) 90 c) 93...
7.3 Answers
1. What is the missing atomic mass?
a) 6 b) 7 c) 14 d) 15
2. What is the missing atomic number?
a) 92 b) 90 c)...
Video:
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7.2 & 7.3 Nearpod - Hulk

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7.2 & 7.3 Nearpod - Hulk

  1. 1. 7.2 Half-Life What will we learn? -What are daughter isotopes? -What is the decay curve? -What is half-life? -What are parent isotopes? -What is radiocarbon dating?
  2. 2. Half-Life is the time it takes for half of the mass of a substance to decay. Shows the rate of radioactive decay for different isotopes. Short half-life = Fast decay rate Knowing the half-life of an isotope allows radioisotope dating to be possible 7.2 Half-Life
  3. 3. A decay curve shows the decay rate for radioisotopes Graphing any isotope’s decay rate will produce the same curve, the only difference is how long the half-life is Decay Curve
  4. 4. The parent isotope = isotope that undergoes radioactive decay The daughter isotope = stable product of radioactive decay It may take several decays for a parent isotope to produce stable daughter isotopes The most common of these parent/daughter pairs are shown in the Common Isotope Pairs Chart These isotopes can all be used in radioisotope dating, for various dating ranges Parent & Daughter Isotopes
  5. 5. This is the method used to date organic material Uses the isotope carbon-14, which has a half-life of 5730 years, and decays into nitrogen-14 Can date material up to 50000 years old Radiocarbon Dating
  6. 6. 7.2 Quiz 1. How much of a sample of 100g of Carbon-14 will be left after 22920 years? a) 50g b) 25g c) 12.5g d) 6.25g 2. What is the daughter isotope of Uranium-235 when it decays? a) nitrogen-14 b) lead-207 c) argon-40 d) lead-206
  7. 7. 7.2 Answers 1. How much of a sample of 100g of Carbon-14 will be left after 22920 years? a) 50g b) 25g c) 12.5g d) 6.25g 2. What is the daughter isotope of Uranium-235 when it decays? a) nitrogen-14 b) lead-207 c) argon-40 d) lead-206
  8. 8. Video:
  9. 9. 7.3 Nuclear Reactions What will we learn? -What is a chain reaction? -What is fission? -What is fusion? -What is a nuclear equation? -What is a nuclear reaction?
  10. 10. Nuclear Fission The splitting of a nuclei into two smaller nuclei, subatomic particles and energy Heavy nuclei are unstable because of protons’ repulsive forces May split into smaller atoms to become stable All nuclear power generation comes from nuclear fission Nuclear waste must be stored away for hundreds of thousands of years
  11. 11. Nuclear Fusion The joining of two nuclei to form a larger nuclei Happens in the core of stars Requires high pressure and temperature In our Sun, hydrogen-2 and hydrogen-3 fuse into helium-4 Currently not a feasible way of generating electricity
  12. 12. Nuclear Reaction A reaction that changes the nucleus of an atom Gains or releases particles or energy Can release electrons, protons, neutrons, or gamma rays Small change of mass = Large change of energy
  13. 13. Chain Reaction One reaction starts the next reaction Reaction continues on its own Releases a large amount of energy, possibly leading to an explosion if not controlled Can be controlled by materials that absorb neutrons, such as cadmium
  14. 14. Nuclear Equation Sum of mass numbers on both sides of the equation must be equal Sum of charges/atomic numbers on both sides of the equation must be equal Equation for nuclear fission of uranium-235: Equation for nuclear fusion of hydrogen-2 and hydrogen-3:
  15. 15. 7.3 Quiz 1. What is the missing atomic mass? a) 6 b) 7 c) 14 d) 15 2. What is the missing atomic number? a) 92 b) 90 c) 93 d) 234 3. What type of radiation caused Bruce Banner to turn into the Hulk? a) Alpha b) Beta c) Gamma d) Neutron
  16. 16. 7.3 Answers 1. What is the missing atomic mass? a) 6 b) 7 c) 14 d) 15 2. What is the missing atomic number? a) 92 b) 90 c) 93 d) 234 3. What type of radiation caused Bruce Banner to turn into the Hulk? a) Alpha b) Beta c) Gamma d) Neutron
  17. 17. Video:
  18. 18. End
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