I can identify the types of radiation and write balanced nuclear equations. I can write balanced nuclear decay equations. I can explain the difference between fission and fusion. I can identify unknown elements in nuclear equations. radioactive dating game? Feb 1-7:12 AM 1
For centuries, alchemists tried to "transmute" cheap metals into GOLD. But they only knew how to do chemical reactions. They could rearrange elements to make new molecules, but they couldn't change the elements themselves. What has to change to get a new element? It turns out, the nuclei of some elements do this all on their own! It's called But WHY does it happen?... Jan 29-1:38 PM 2
AND, the closer they are, the harder they repel! p p p p p p and neutrons protons To keep the p + s from flying appart, there have to be n 0 s. More p + s = more repulsion. More n 0 s = more attraction. Nuclear decay happens when a nucleus is unstable. NUCLEAR DECAY (losing parts of the nucleus) makes the nucleus more stable. Let's take a closer look at how this works... to a point Nov 15-4:04 PM 3
Experiments by Becquerel, Rutherford and Marie Sklodowska Curie and her husband Pierre Curie had shown that uranium, radium and certain other radioactive substances gave off three types of radiations. They performed many experiments to discover the properties of these radiations. Jan 30-6:42 PM 4
What kind of radiation killed Alexander Litvinenko? (stop @ 2:40) Jan 28-4:46 PM 5
Take turns (shortest to tallest) writing your group's answers on the whiteboard: Jan 28-4:06 PM 6
Write the symbol for this particle, complete with mass, atomic # (# p+), and element: Jan 29-11:45 AM 7
Continue on boards: What does the arrow mean in this nuclear equation? Describe what is happening in this reaction. (Practice on your partner. I'll call on a "volunteer.") How many total neutrons are there before the decay? After? How many total protons are there before the decay? After? NUCLEON = nuclear particle (protons and neutrons). How many total nucleons before the decay? After? Jan 29-11:32 AM 8
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What element underwent alpha decay here? Jan 29-11:03 AM 11
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Francium-221 is the daughter nucleus of an decay. Write the equation showing the proper parent nucleus: Jan 29-1:29 PM 14
Carbon-14 decays into Nitrogen-14 like this: Jan 29-10:56 AM 15
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Radiation? Radiation? Radiation? Oct 15-12:59 PM 19
Unstable nuclei will continue to decay until it becomes a stable isotope. Feb 2-3:08 PM 20
The particles produced by the decay of strontium-90 are used to kill the cells of bone and eye cancers. Write the equation: Jan 29-10:57 AM 21
BETA LIGHT: a light that uses radioluminescence with beta particles as the energy source. The daughter nucleus is helium-3. Write the equation: Jan 30-9:08 PM 22
Why is alpha radiation not typically that big-o-deal, healthwise? What do the superscripts on the symbols tell us about the radiation? What do the subscripts on the symbols tell us about the radiation? How is ray radiation different than or? 234 91 234 91 0 0 201 79 0-1 201 80 0 0 Jan 30-9:30 PM 23
Gamma rays are released when a nucleus is excited. The nucleus becomes more stable, but isn't fundamentally changed. This usually happens in conjuction with alpha or beta decay. Jan 30-8:26 PM 24
Let's review! Jan 30-9:19 PM 25
Picture found in Honkawa Elementary School in 2013 of the Hiroshima atom bomb cloud, believed to have been taken about 30 minutes after detonation from about 10 km (6.2 mi) east of the hypocenter Jan 31-3:20 PM 26
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Complete HO1: Atomic Bombs http://www.atomicarchive.com/fission/fission1.shtml -141 Jan 31-7:42 AM 28
Describe HOW you'd find the identity of X in the equation: 235 92 Practice on your group--i'll call on a "volunteer". 1 0 152 60 1 0 What is missing in the following reaction? 235 92 1 0 90 37 Propose another series of products from U-235 fission and write it's nuclear equation. (Trade boards with another group. Make sense?) These fission equations show the production of many different elements, even though each reaction begins with Uranium-235 and one neutron. How is this possible given the conservation laws for nuclear reactions? Complete HO2: Nuclear Reactors https://phet.colorado.edu/en/simulation/nuclear-fission Inside a nuclear reactor. 1 0 Jan 31-2:53 PM 29
10 4 If burning a gram of wood will roast 1 marshmallow, how many marshmallows can you roast with the fission of a gram of uranium? Jan 31-9:05 PM 30
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-141 Complete the diagram: Jan 31-4:15 PM 33
These fusion equations show the production of atoms of several different elements, even though each reaction begins with isotopes of hydrogen. Knowing the starting elements, can one predict what element will form as a result of a given reaction? How do you know? Start with any two hydrogen isotopes and propose your own fusion products. Write the equation (remember conservation of nucleons). Jan 31-4:09 PM 34
Identify the following as FISSION or FUSION: Jan 31-4:28 PM 35
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