Any two inventions or discoveries of the twentieth century Or Comparing Fission and Fusion Reactions: Man has always been interested in discovering ideas and inventing new things. He started pondering over the facts and figures from the very early stage of his evolution and as a result he kept on progressing. We have reached a stage where we are living in the so called ‘Nuclear World’. Not only the nuclear power plants but also the nuclear weapons like Atomic bomb and Hydrogen bomb are the result of either of the two nuclear reactions; Nuclear Fission or Nuclear Fusion. Both of which were discovered in the second quarter of the twentieth century.
Radioactive materials and some other substances decompose according to a formula for exponential decay. That is, the amount of radioactive material A present at time t is given by the formula A=A0ekt where k<0. A radioactive substance is often described in terms of its half-life, which is the time required for half other material to decompose. For a further understanding, the half-life of the radioisotope plutonium-239, for example, is about 24,000 years. Starting with a pound of plutonium-239, in 24,000 years there will be one-half pound of plutonium-239, in another 23,000 years there will be one-fourth pound, and so on.
3.03 Periodic Trends Julianne Mazzaro 1. Refer to the graph that you created in Part I of this assignment. Describe the general trend or patterns that you observed in the atomic radius as you go across the periodic table. As the number of protons (atomic number) gets bigger, the atomic radius gets smaller. The largest decrease in size was from 3 to 4, and it leveled out after the 5 to 6 decrease.
Nuclear fission only produces steam from the power plants, causing no harm to the environment. However nuclear power is less clean before and after production. Uranium atoms are split in a series of nuclear reactions to produce a surge of heat energy which boils water, to produce steam which turns turbines, powering generators to form electricity. The uranium must be mined from other sites however and be transported to the plants, which can mean expensive importing costs, and the environmental cost of carbon dioxide produced in the transport of uranium. After production, the radioactive waste produced in nuclear power is incredibly harmful and can take years to decay and no longer be radioactive.
Although very thin, Mercury’s atmosphere is made up of trace amounts of gasses including 42% Oxygen, 29% Sodium, 22% Hydrogen, 6% Helium, and 0.5% Potassium. Mercury’s location in the solar system makes it difficult at best to hold at atmosphere as it is in such close proximity to the sun. The atmosphere would only be there for a short amount of time before being blasted off my solar winds, meteoroid bombardment and outgassing (the gas escapes into the
Avogadro was also the father to 6 children, all of which were boys (“History of Avogadro”, Anne Marie Helmenstine). Only brief descriptions of his personal life are known, but when it comes to chemistry he is well-known for his works. The single ideal that made Avogadro’s name was his number. Avogadro’s number is used to describe the amount of molecules in a mole of a substance (this number is approximately 6.022×10 23) . Avogadro’s number is used every day by chemists and students alike.
Date: October 21, 2012 Class: Survey of the Sciences Subject: Unit 5. Isotopes and Radiation Radioactivity is the emission of energetic particles or waves from atoms. Natural radiation occurs when unstable nuclei transform to some other nucleus by emitting radiation. As they decay over varying lengths of time (from microseconds to hundreds of thousands of years), they emit energetic particles or waves. An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element.
There are 28 additional unstable isotopes that are known. Tin has a half-life of 230,000 years, all the radioactive isotopes have a half-life of less than a year. Tin is obtained from the mineral, cassiterite, where it occurs as Tin dioxide. Tin is greatly used in the commercial production in the food industry for packaging. Usually coating other metals to prevent corrosion, like in Tin cans.
What Makes Triops Successful Species | The Triop Experiment | | | | | Objective: What Makes Triops Successful Species? Materials: One tank, Triop Eggs, Triop Food, Nutrient Pack, Thermometer, Magnifying Glass, Gravel, One Gallon of Spring Water, Light Hypothesis: Triops have outlived the dinosaurs for many reasons. Throughout the experiment I will discover the reason. Triops have not changed much since their existence twenty million years ago. If triops were unsuccessful species it would have died off or go through the process of a drastic evolution.
Carbon dating is a technique used by scientists to date fossils. It relies on the fact that the C14 isotope of carbon decays into another isotope of carbon, C12 at a rate proportional to its mass. This means that it has a constant rate of decay. The same equation is used for this as for continuous compounding and population growth. Though logarithms are not a part of most people daily lives it is a crucial mathematical expression in others.