Nuclear fission and fusion 0.0 / 5 ? ScienceSoundGCSEAQA Created by: nimrahali12Created on: 20-10-16 19:01 What does nuclear fission mean? the splitting up of big atomic nuclei 1 of 32 Nuclear power stations generate electricity using? nuclear reactors 2 of 32 In a nuclear reactor , a controlled chain reaction takes place in which atomic nuclei? split up and release energy in the form of heat 3 of 32 This heat is then used to? heat water to make steam 4 of 32 which is used to? drive a heat turbine connected to an electricity generator 5 of 32 The "fuel" thats split is usually? uranium-235 6 of 32 But sometimes is? plutonium-239 or both 7 of 32 The chain reactors:What has to be done to make nuclear fission happen? a slow moving neutron must be absorbed into a uranium or plutonium nucleus .This addition of a neutron makes the nucleus unstable causing it to split. 8 of 32 What happens when each time a uranium or plutonium nucleus splits up? It spits out two or three neutrons , one of which might hit another nucleus, causing it to split also and keeps the chain going 9 of 32 When a large atom splits in two it will form? two new smaller nuclei 10 of 32 These new nuclei are usually radioactive because? they have the wrong number of neutrons in them 11 of 32 A nucleus splitting (called fission) gives out? lots of energy 12 of 32 More energy than? any chemical reaction 13 of 32 Nuclear processes release ? such more energy than chemical processes do 14 of 32 Thats why nuclear bombs are so much more powerful than? regular bombs 15 of 32 What is the main problem with nuclear power? disposal of waste 16 of 32 The products left over after nuclear fission are? highly radioactive so they just can't be thrown away 17 of 32 They are difficult and _____ to dispose safely expensive 18 of 32 Nuclear fuel is cheap but ? the overall cost of nuclear power is high 19 of 32 due to? the cost of the power plant and final decompissiong 20 of 32 Dismantly a nuclear plant safely takes ? decades 21 of 32 Nuclear power also carries? the risk of radiation leaks from the plant or a major catastrophe like Chernobyl 22 of 32 What is nuclear fuison? the joining of small atomic nuclei 23 of 32 Two nuclei (hydorogen) can join to create a larger ____ nuclear-nuclear fusiom 24 of 32 Fusion releases a lot of energy (more than fission for a given mass)-all the energy released in stars comes from? fusion 25 of 32 So people are trying to? develop fusion reactors to generate electricity 26 of 32 Fusion doesn't leave behind a lot of radioactive waste like fission and there is plenty of ? hydrogen knocking about to use as fuel 27 of 32 The big problem is that fusion can only happen at? really high temps (10000000oc) 28 of 32 You can't hold the hydrogen at the high temps and pressures required for? fusion in an ordinary container-you need an extremely strong magnetic feild 29 of 32 There are a few experimental reactors around , but none of them are generating? electricity yet 30 of 32 There are a few experimental reactors around , but none of them are? generating electricity yet 31 of 32 At the moment it takes more power to get up to ? temps than the reacctor can produce 32 of 32
Comments
No comments have yet been made