Mystery Solution III Flashcards
What process does the nuclear power station uses?
Nuclear fission
What is the half- life of a radioactive substance?
The time it takes for radioactivity to halve
What are the two main types of nuclear reactions?
Nuclear fission and nuclear fusion
What is nuclear fission?
Occurs when the nuclei of large atoms split to form the nuclei of small atoms releasing energy in the form of radiation and heat.
What are fission products?
The two smaller nuclei which after the nucleus has been split
What is a chain reaction?
When the neutrons being released causes other nuclei to split
What happens in a nuclear reactor?
It controls the rate of energy by limiting the number of neutrons
What process is behind the destructive power of nuclear weapons?
Uncontrolled chain reactions
What are substances that react together in a chemical reaction?
Reactants
What is the new substance formed from a chemical reaction called?
Products
What is combustion?
Is a chemical reaction where something burns with air to produce heat, light and sound energy
What are exothermic reactions?
The type of reaction which releases energy e.g. hot packs and respiration
What is the law of conservation of mass?
That mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations
What are the advantages of nuclear energy?
- doesn’t cause air pollution
- conserves valuable fossil fuels
- reduces greenhouse gases emissions
- reduces the problem of acid rain
- can produce a lot of energy, with a tonne of uranium producing more energy than several million tonnes of coal
What are the atoms in a molecule held together by?
The atoms are held together by the attractive forces of chemical bonds, where a positively charged and negatively charged ion are attracted together.
