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It may be surprising that rare-earth elements are not all that uncommon compared to other elements on the periodic table. Instead, their most distinctive feature is a common geochemistry. Here, focus on how rare-earth elements and the so-called "lanthanide contraction" trend spurred substantial technological advancements in lighting, electronics, headphones, and more.
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Finish the course by peering into the future of this fascinating field. How can groundbreaking chemical advancements help us stave off global famine - and even help us live on other planets? By exploring questions like these, you'll truly understand how organic chemistry can help us build a better world.
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Dig deeper into the nucleus to discover how so little matter can convert into the tremendous energy of a nuclear explosion, as described by Albert Einstein's famous mass-energy equation. Focus on nuclear binding energy and mass defect, both of which are connected to the release of nuclear energy.
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How do organic chemists actually prove the behavior of molecules and chemical structures you've learned about in the preceding lectures? The answer: spectroscopy, which entails the observation of the interaction between matter and light. In the first of several lectures on the topic, focus specifically on observations made with the UV-visible spectrum.
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Start exploring organic chemistry's foundations with a review of the basic science of chemistry (including atomic structure and the periodic table). Then, get an engaging introduction to organic chemistry: its origin, its evolution, its relationship to carbon, and its fascinating applications in everything from food to fuel to medicine.
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A cosmic event is not the only way an element can transform. The processes of transmutation, radiation, and nuclear fission are equally capable of radically altering elements and their behaviors. Familiarize yourself with the ever-important process of transmutation and learn how elements with unstable nuclei break down to produce more stable products through radiation and nuclear fission.
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How can pi bonds change the chemistry of hydrocarbons? How did one of the greatest rivalries in chemistry lead to an understanding of trends in stability among regio- and stereoisomers with the same molecular formula? Why do terminal alkynes have such unusual acidity? Professor Davis has the answers to these and other questions.
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Probe the methods used by researchers to create molecules that can correct medical problems such as inflammation, bacterial infections, and cancer. As an example, study the lock-and-key model of enzyme activity, which explains how many enzymes work, highlighting a potential weak link that can be exploited by drugs.
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Encounter reduction-oxidation (redox) reactions, which involve the exchange of electrons between substances. Discover that this process explains geological events on the early Earth, including why iron in its metallic state is so rare in nature. Then explore associated phenomena, including the activity series of metals.
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Delve into the dark world of chemistry as a weapon of war. Crude chemical weapons were used in antiquity, but they didn't reach true sophistication and strategic significance until World War I. Profile the father of modern chemical warfare, chemist Fritz Haber, and look at the specific action of a number of deadly chemical agents.
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After the alkali metals come the alkaline metals, a slightly less reactive group of elements. In this lesson, explore the characteristics of group two metals like calcium, strontium, and barium, and figure out why they oxidize slower and melt at higher temperatures than the alkali metals.
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The periodic table was a collaborative effort that spanned centuries. In this lesson, dig deeper into its early history. Learn about debates surrounding the classification and categorization of elements, and explore how the discovery of subatomic particles, specifically protons, propelled a specific version of the periodic table to the forefront.
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Conclude the course by ranging beyond our planet to sample atoms and molecules in the cosmos. Specifically, search for two substances that are prerequisites for life: water and organic molecules. Both turn out to be plentiful, suggesting that the study of chemistry has a long and bright future!
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Discover an alternate model of chemical bonding: molecular orbital theory, developed by Friedrich Hund and Robert Mulliken. This idea explains such mysteries as why oxygen is paramagnetic. See a demonstration of oxygen's attraction to a magnet, then use molecular orbital theory to understand why this happens.
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Investigate some of the key methods scientists employ to communicate the right structural information about molecular compounds, including their identity, the ratio of elements that comprise them, and their connectivity. Explore Fischer projections, Newman projections, and stereoimages - all of which help us overcome the challenges of conveying the three-dimensional positions of atoms.
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Nitroglycerine, dynamite, TNT. What do these explosives have in common? They all contain highly reactive compounds that combine nitrogen and oxygen in organics. Look closely at these and other materials in this in-depth lecture on functional groups containing nitrogen and oxygen that covers everything from nitrate esters to trinitrotoluene to amino acids.
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How are organic materials purified for both study and practical use? One staple technique is recrystallization, which relies on the tendency of organic molecules to form highly ordered crystals. Topics here include the effect of impurities on organic crystalline solids; the phenomenon of incongruent melting; and more.
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Now turn to liquids, which have a more complicated behavior than gases. The same intermolecular forces apply to both, but at much closer range for liquids. Explore the resulting properties, including viscosity, volatility, incompressibility, and miscibility. Also consider applications of these qualities.
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