fission and fusion and nuclear reactors

Question 1

what happens during fission

Answer 1

large nuclei break into smaller nuclei

Question 2

what happens during fusion

Answer 2

small nuclei join together to produce larger nuclei

Question 3

what is a typical fuel of fusion

Answer 3

hydrogen

Question 4

is there an increase in mass in fission

Answer 4

no

Question 5

is there an decrease in mass during fusion

Answer 5

yes

Question 6

can fusion or fission be used in weapons, if so which one

Answer 6

yes, both

Question 7

energy is released in fusion is generally

Answer 7

large

Question 8

fusion is an energy source in

Answer 8

stars

Question 9

energy is released in

Answer 9

both

Question 10

can fission or fusion be used in weapons, if so which one

Answer 10

both

Question 11

the core temperature of fission is generally

Answer 11

high ( 300ºC)

Question 12

relative energy released in fission is

Answer 12

small

Question 13

the electrostatic attraction must be overcome in

Answer 13

fusion

Question 14

a typical fuel of fission is

Answer 14

uranium

Question 15

fission requires ___ moving neutrons

Answer 15

slow

Question 16

in which is there a decrease in mass and why

Answer 16

both
because some of the mass is converted into energy

Question 17

nuclear fission is

Answer 17

a type of nuclear reaction that is used to release energy from large and unstable atoms by splitting them into smaller atoms

Question 18

for fission to happen a ____ needs to collide into the nucleus

Answer 18

neutron

Question 19

the type of energy released in fission is

Answer 19

kinetic energy

Question 20

in nuclear fusion, 2 ____ nuclei collide at ____ speed and __ to create a larger and heavier nucleus

Answer 20

light

high

fuse

Question 21

hydrogen nuclei fuse to form a

Answer 21

helium nucleus

Question 22

the energy released in fission can be used to

Answer 22

heat water to make steam for turbines and generators

Question 23

in fusion, is the mass heavier before they fuse or after

Answer 23

before

Question 24

does fusion release a lot of energy

Answer 24

yes

Question 25

have scientists found a way of using fusion to generate energy for us to use ?

Answer 25

no because its expensive but mostly, the conditions needed are very high temperatures and pressures and we haven't been able to create them without using more energy thsn the fusion would create

Question 26

nuclear fission is used to

Answer 26

generate electricity in nuclear power stations

Question 27

nuclear fusion releases ___ energy from a given mass of fuel and produces way ___ nuclear waste

Answer 27

more less

Question 28

fuel is unlimited for

Answer 28

fusion

Question 29

conditions needed for fusion

Answer 29

the conditions needed are very high temperatures and pressures

Question 30

what are the 2 types of fission

Answer 30

spontaneous fission induced fission

Question 31

products of fission

Answer 31

- 2 daughter nuclei - 2 or 3 neutrons

Question 32

when does induced fission happen

Answer 32

when a neutron is absorbed

Question 33

when does spontaneous fission happen

Answer 33

on its own, no neutron needs to be absorbed

Question 34

something that can undergo fission is called

Answer 34

fissile

Question 35

___ neutrons are better at inducing fission than ___ ones

Answer 35

slow fast

Question 36

a chain reaction happens when

Answer 36

the released neutrons of one fission reaction collide with other atoms, which themselves then undergo fission.

Question 37

in fission, the neutrons released carry ___ of the energy from the reaction.

Answer 37

most

Question 38

in a nuclear reactor ( fission), the neutrons are __ ___ and transfer energy by ___

Answer 38

slowed down heating

Question 39

a chain reaction is stopped by

Answer 39

control rods

Question 40

is radioactive decay a source of energy

Answer 40

yes

Question 41

in uranium 235, when fission occurs, it produces___ neutrons, __ daughter nuclei and creates__ which is very ___ and falls apart.

Answer 41

2 or 3 2 Uranium 236 unstable

Question 42

fusion is the energy source for

Answer 42

stars

Question 43

a chain reaction can only be stopped if

Answer 43

it is in a nuclear reactor and you insert control rods

Question 44

a control rod

Answer 44

absorbs neutrons

Question 45

if a control rod is inserted fully, it

Answer 45

stops reactions altogether

Question 46

raising the rods ____ the rate of fission because ...

Answer 46

increases fewer neutrons are absorbed

Question 47

fission in a control rod is called

Answer 47

controlled fission

Question 48

a moderator

Answer 48

slows down neutrons

Question 49

the moderator is a material that

Answer 49

surrounds the fuel rods inside the reactor core and helps graphite heat up