UNIT 2 NUCLEAR REACTIONS 7

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Presentation transcript:

UNIT 2 NUCLEAR REACTIONS 7 UNIT 2 NUCLEAR REACTIONS 7.4 What are natural and artificial transmutations? May 19, 2010 AIM: What is the difference between artificial and natural transmutations DO NOW: 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 ½ x ½ x ½ = 1/8, so 3 half lives

REVIEW Spontaneous Decay is when an unstable radioactive nuclei changes into a stable isotope. Every decay reaction we looked at so far represents spontaneous decay

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. __________________________________ different NATURAL ARTIFICIAL

For this change to happen, high‐energy particles are fired NATURAL ARTIFICIAL For this change to happen, high‐energy particles are fired at the element. The element undergoes spontaneous decay because it is unstable. These reactions occur “spontaneously” (on its own) In this reaction, two things are being combined: (1) The nucleus being bombarded (2) The high‐energy particle We start with ONE element on the RIGHT side of the arrow and end up with TWO things on the product side (right side) 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 THESE Natural Natural Natural Artificial Natural 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 4 He 2

INDEPENDENT PRACTICE Complete the PRACTICE section Please complete the classwork