UNIT 2 NUCLEAR REACTIONS 7.4 What are natural and artificial transmutations?
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Transcript of UNIT 2 NUCLEAR REACTIONS 7.4 What are natural and artificial transmutations?
UNIT 2NUCLEAR REACTIONS
7.4 What are natural and artificial transmutations?May 19, 2010
DO NOW:1. What subatomic particle is negatively charged?
2. Write the nuclear decay equation for gold‐198.
3. If 1/8 of C‐14 is left over, how many half‐lives did the sample undergo
Electron (e-)
198 0 198
79Au -1β + 80Hg
AIM: What is the difference between artificial and natural transmutations
½ x ½ x ½ = 1/8, so 3 half lives
• Spontaneous Decay is when an unstable radioactive nuclei changes into a stable isotope.
• Every decay reaction we looked at so far represents spontaneous decay
REVIEW
TRY
Write the spontaneous decay reaction for:• 1. K 42‐
• 2. Radon 222‐
NATURAL AND ARTIFICIAL TRANSMUTATION
• ______________________ is a reaction in which we change one element to _________________element.
• • There are two kinds of transmutation reactions:
1. __________________________________2. __________________________________
Transmutation
different
NATURALARTIFICIAL
NATURAL ARTIFICIAL
The element undergoes spontaneous decay because it is unstable.
These reactions occur “spontaneously” (on its own)
We start with ONE element on theRIGHT side of the arrow and end up with TWO things on the product side (rightside)
For this change to happen, high‐energy particles are fired at the element.
In this reaction, two things are beingcombined:(1) The nucleus being bombarded(2) The high‐energy particle
We start with TWO things on the left side of the arrow and 2 or more things on the right side of the arrow
TRY THESENatural
Natural
Natural
Artificial
Natural
Artificial
Artificial
Balancing natural and artificial transmutation reactions
Remember the law of conservation of mass! We must have a balanced equation!
Balance the equation
4
2
He4
2
INDEPENDENT PRACTICE
• Complete the PRACTICE section• Please complete the classwork