Chemistry_Grade_10-12 (1).pdf

And occurs when one nuclear reaction starts off

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, and occurs when one nuclear reaction starts off another, which then also starts off another one so that there is a rapid increase in the number of nuclear reactions that are taking place. 118
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CHAPTER 7. ATOMIC NUCLEI - GRADE 11 7.8 neutron U-235 U-236 Neutron is absorbed by the nucleus of the U-235 atom to form U-236 Massive release of en- ergy during nuclear fission U-236 splits into lighter elements called fission products and free neutrons The elements and number of neutrons produced in the process, is random. 7.8.1 The Atomic bomb - an abuse of nuclear fission A nuclear chain reaction can happen very quickly, releasing vast amounts of energy in the process. In 1939, it was discovered that Uranium could undergo nuclear fission. In fact, it was uranium that was used in the first atomic bomb. The bomb contained huge amounts of Uranium-235, enough to start a runaway nuclear fission chain reaction. Because the process was uncontrolled, the energy from the fission reactions was released in a matter of seconds , resulting in the massive explosion of that first bomb. Since then, more atomic bombs have been dropped, causing massive destruction and loss of life. Activity :: Discussion : Nuclear weapons testing - an ongoing issue Read the article below which has been adapted from one that appeared in ’The Globe’ in Washington on 10th October 2006, and then answer the questions that follow. US officials and arms control specialists warned yesterday that North Ko- rea’s test of a small nuclear device could start an arms race in the region and threaten the landmark global treaty designed nearly four decades ago to halt the spread of nuclear weapons. US officials expressed concern that North Korea’s neighbors, including Japan, Taiwan, and South Korea, could eventually decide to develop weapons of their own. They also fear that North Korea’s moves could embolden Iran, and that this in turn could encourage Saudi Arabia or other neighbours in the volatile Middle East to one day seek nuclear deterrents, analysts say. North Korea is the first country to conduct a nuclear test after pulling out of the Nuclear Nonproliferation Treaty. The treaty, which was created in 1968, now includes 185 nations (nearly every country in the world). Under the treaty, the five declared nuclear powers at the time (United States, the Soviet Union, France, China, and Great Britain) agreed to reduce their supplies of nuclear weapons. The treaty has also helped to limit the number of new nuclear weapons nations. But there have also been serious setbacks. India and Pakistan, which never signed the treaty, became new nuclear powers, shocking the world with test explosions in 1998. The current issue of nuclear weapons testing in North Korea, is another such setback and a blow to the treaty.
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