a big, unstable nucleus can split into smaller ones when ,for example, absorbing a neutron
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What are nuclei resulting from a fission reaction called?
daughter nuclei
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What's a chain reaction?
when in a fission reaction nuclei are formed, neutrons released in the reaction undergo fission
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If a chain reaction isn't controlled-
there'll be a nuclear explosion
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How are chain reactions controlled?
use a different material to absorb neutrons,slwoing the recation down as there are fewer neutrons to stimulate more fission recations
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Only one neutron from each _____ can cause another _____
fission
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Fusion occurs when-
small nuclei join to make large ones
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Why is fusion difficult?
Nuclei have to be really close before it occurs, and as unless really high temperatures and pressures are reached to overcome this, the positive charges repel one another
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Why isn't fusion a casual source of energy?
To produce the correct heat and pressure needed for fusion on Earth, it uses more energy than it makes
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In 1989 scientists said they made fusion happen at 50 degrees celsius. Why?
there isn't any proof they did, so their experiments aren't valid. They could've lied or pulled of something really amazing but we'll never know.
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What kind of fusion was said by some scientists to have occurred in low temperatures?
Cold fusion
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Other cards in this set
Card 2
Front
What are nuclei resulting from a fission reaction called?
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