Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

8Sci CH18

8th Science CH18 Fission and Fusion

TermDefinition
artificial transmutation transmutation that does not happen spontaneously; scientists have forced nuclei to transmute by using particle accelerators, with the result that gaps in the periodic table have been filled and more than a dozen nw radioactive elements have been created
chain reaction reaction that can start if the neutrons freed by the split of one heavy nucleus into two lighter nuclei cause fission in other nuclei;in nuclear reactors, neutron-absorbing materials can be used so that fission chain reactions do not go out of control
fission nuclear reaction in which a large nucleus is split and energy is released; nuclear reactors produce electrical energy from a controlled fission chain reaction
fusion joining of smaller nuclei into larger ones; fusion of hydrogen into helium releases vast amounts of energy and is the energy powering the stars, including the sun; nuclear fusion is common in nature but not on Earth
transmutation occurs when an atom of one element changes to an atom of another element by spontaneously emitting a particle, or by decaying--which changes its number of protons and its atomic number