Save
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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
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

gcse science P4 - H

specific for ocr gateway additonal science B.

QuestionAnswer
how are artificial radioisotopes produced? by bombarding atoms with the neutrons present in a nuclear reactor
why are neutrons easily captured by many nuclei? they're uncharged
what are the two isotopes of natural uranium? uranium-235 and uranium-238
what is used as a fuel in power stations? enriched uranium
what does the enriched uranium contain more of? uranium-235 isoptope than occurs naturally
when does fission occur? when a large unstable nucleus is split up and energy is released
what is this energy released as? heat
how is this energy used in nuclear power stations? -heat used to boil water -this produces steam -the pressure of the steam turns the turbine -the turbine turns the generator, producing electricity
how is energy made in a nuclear power station? by bombarding atoms of uranium-235 with neutrons, which causes the nucleus to split and release energy
what can a typical fission be shown as? 235 1 90 143 (1 ) U + n - Kr + Ba + 3( n)+ γ-rays 92 0 36 56 (0 )
what is a chain reaction? when extra neutrons emitted cause further uranium nuclei to split.
what does a chain reaction produce? large amounts of energy
what does nuclear fission produce? radioactive waste
what has to be done with radioactive waste? disposed safely and handled carefully
what is an example of very low-level waste? that produced by medical applications
how is low-level waste disposed of? placed in sealed plastic bags then buried or burned under strict controls
how is other low-level waste disposed of? embedded in glass discs and buried in the sea
what is an example of high-level waste? spent fuel rods
how is high-level waste disposed of? re-processed to make more radioactive materials
how is the output of a nuclear reactor controlled? 1 -graphite moderator between the fuel rods slows down the fast-moving neutrons emitted during fission. slow-moving neutrons are more likely to be captured by other uranium nuclei
how is the output of a nuclear reactor controlled? 2 boron control rods can be raised or lowered. boron absorbs neutrons, so fewer neutrons are available to split more uranium nuclei.
Created by: jirwin
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards