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Leaving cert Chem
2- Radioactivity
Question | Answer |
---|---|
2008 Q4 Give two properties of alpha particles | 1. Positively charged. 2. Relatively low penetration ability being stopped by paper. |
2009 Q4 What change occurs in the nucleus of an atom when it undergoes beta emission? | The nucleus becomes a proton and an electron. The atomic number increases by 1 |
2010 Q11 Define radioactivity. | The spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation |
2010 Q11 Define the half-life of a radioactive isotope. | The time taken for half the nuclei in any given sample to decay |
2010 Q11 State one risk associated with exposure to alpha radiation. | Cancer |
2011 Q10 What are isotopes? | Isotopes are atoms with the same atomic number but a different mass number due to different numbers of protons in the nucleus |
2011 Q10 Define radioisotope. | A radioactive isotope. |
2013 Q10 Give two differences between chemical and nuclear reactions. | 1. Chemical reactions involve the electrons where as nuclear reactions take place in the nucleus. 2. New elements are formed in nuclear reactions. |
2013 Q10 Give two properties of beta particles. | 1. They are fast moving electrons. 2. Have more penetrating ability than alpha particles. |