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As shown on the History Channel. Gold dates from the time of the supernova explosion that gave birth to the building blocks of our solar system. When it was created, the Earth included a tiny percentage of gold atoms, and over the aeons geologic processes have concentrated it into various nooks and crannies around the globe. The best of it is in the ancient Precambrian rocks in South Africa, where the deepest mines in the world extract it. In other regions of the world, gold can be gathered from younger sedimentary rocks that have been eroded off older Precambrian rocks. The American gold rush was this type of deposit. Now in Nevada, sedimentary rocks are leached on a truly vast scale to extract the gold.
Lab experiments show how magnesium, zinc, iron, and copper react with hydrochloric and nitric acids. Also shows the displacement of two metals from salts.
Shows the combustion of magnesium, a thermite reaction to form iron, and the chemical reactions of sodium and potassium with water.
It is important to properly dispose of metals for the safety of people and the environment. Due to potential contamination problems, environmental programs focus on the recycling, reusing, and reducing of metals.
Explains why Earth is precious and how it is being damaged. Special attention is paid to how individuals can conserve natural resources and care for the planet.
Science lab experiments demonstrate what happens visibly and at a molecular level with the Group 1 highly reactive metals and the Group 17 highly reactive halogens from the periodic table. Experiments also illustrate the range of reactivity among metals. Video has three 5-minute segments for convenience.
Radium is a chemical element with the symbol Ra and atomic number 88. It is a alkaline earth metals.
(Source: Library Lyna)
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray solid alkaline earth metals.
Praseodymium is a chemical element with the symbol Pr and atomic number 59. It is traditionally considered to be one of the rare-earth metals.
Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal.
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic is a metalloid and occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal.
Caesium has the atomic number 55 and symbols Cs. It is an alkali metal with a silvery-gold color and the only liquid metal from the group of elemental metals, which is liquid near or at room temperature.
Coral reefs are some of the most precious habitats in the ocean, which has earned them the nickname "rainforests of the sea." They're a complicated ecosystem where thousands of species are supported by some of the smallest life-forms. Part of the "Coral Comeback" series.
Mining traditionally has destroyed vegetation and topsoil as it takes minerals from the ground. New techniques and increased environmental awareness has recently led to new land reclamation experiments. Adding earthworms and bacteria to restore the land is one such venture. Highlights bioremediation--using living organisms-- to clean up heavy metals left as mining residue.
It’s a freezing cold day inside the National Ice Core Laboratory (NICL) in Denver, Colorado. That’s because the NICL is a facility for storing and studying ice cores recovered from the polar regions of the world. And, saws are buzzing, as scientists from all over the U.S. are measuring and cutting pieces of precious Antarctic glacier ice to take back to their labs for research. Part of the National Science Foundation Series “Science Nation.”
Parasitoid insects are veritable serial killers, and they play a major role in the regulation of insect populations. Scientific research on the lines of a criminal investigation reveals how these killers behave and what remarkable capabilities they have. In basic research, parasitoids make excellent models for behavioral ecology studies. They are also used in applied research, notably for biological control, where they can serve as precious auxiliaries for controlling crop pests. Parasitoids still have many secrets to reveal, and new research avenues are opening up.
This University of Miami residence hall may look typical, but students in one of the apartments are participating in research involving one of the planet’s most precious commodities--water. With support from the National Science Foundation (NSF), environmental engineer James Englehardt and his team created a net zero water system, which serves most of the residents’ daily needs, including dish washing, showering and laundry. All of the water is treated just outside the building, and reused in a sustainable loop. Part of the National Science Foundation Series “Science Nation.”
Already parts of the world suffer from lack of water, and with increasing demand it's expected to get worse. To better understand and predict drought, thirty universities are collaborating in a multidisciplinary effort called the Shale Hills Project. Among the studies, is field research following the life cycle of water along the Susquehanna River Basin. With support from the National Science Foundation, civil engineer Chris Duffy and his team at Penn State are tracking several aspects of rainfall to better understand the relationship between the flow of water, drought prone areas, and urban populations.
Every portable electronic device is fueled by chemistry, specifically through oxidation-reduction or redox reactions. In redox reactions, one compound gains electrons (reduction) and one compound loses them (oxidation). Chemists can set up reactions so that electrons are forced to move in a certain way to create an electrical current. Metals often play a key role in redox reactions, which are essential to all aspects of chemistry, particularly in many biochemical processes. Part of the series Chemistry: Challenges And Solutions.
Figure 2.11 (OpenStax, Biology 2e) caption: In the formation of an ionic compound, metals lose electrons and nonmetals gain electrons to achieve an octet.
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3D models and images of the entire periodic table of elements
A collection containing 118 resources, curated by Library Lyna
A collection of Chemistry related resources
A collection containing 67 resources, curated by Benetech