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Gold is a chemical element with the symbol Au and atomic number 79, making it one of the higher atomic number elements that occur naturally. In a pure form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile trasition metal.
(Source: Library Lyna)
Shows the combustion of magnesium, a thermite reaction to form iron, and the chemical reactions of sodium and potassium with water.
(Source: DCMP)
Lab experiments show how magnesium, zinc, iron, and copper react with hydrochloric and nitric acids. Also shows the displacement of two metals from salts.
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.
Charles Darwin once boldly predicted that buried deep in the earth are transitional fossils of creatures with intermediate features between ancestral animal groups and the modern animal groups. Since Darwin’s time, many transitional fossils have been discovered, and they provide crucial insights into the origin of key structures and the creatures that possess them. And University of Chicago paleontologist and award-winning author Neil Shubin provides a first-hand account of the painstaking search for the transitional fossil of Tiktaalik, a creature with a mix of features common to fish and four-legged animals.
The discovery of Archaeopteryx in a quarry in Germany in the early 1860s provided the first clue that birds descended from reptiles. In the last 40 years, scientists have identified many shared features between birds and two-legged carnivorous dinosaurs called theropods.
Paleontologists have studied the fossil record of human evolution just like they have done for other major transitions, including the evolution of tetrapods from fish and the evolution of birds from dinosaurs. Sean Carroll and Tim White discuss the most important human fossils and how they illuminate key phases of human evolution, focusing in particular on three traits: larger brains, tool use, and bipedality.
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.
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.
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.
Indium is a chemical element with the symbol In and atomic number 49. Indium is the softest metal that is not an alkali metal.
Rubidium is the chemical element with the symbol Rb and atomic number 37. Rubidium is a very soft, silvery-white metal in the alkali metal group.
Lithium is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white alkali metal.Under standard conditions, it is the lightest metal and the lightest solid element.
Tests the heat zones of a Bunsen burner and shows some elements' coloration when placed in the flame. Notes that chemistry is everywhere, in both natural and man-made components.
Strontium is the chemical element with the symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly chemically reactive.
Students design and build magnetic-field detectors and use them to find hidden magnets in this activity from "Design Squad Nation." They also learn how NASA uses magnetometers to learn what is going on inside a planet or moon. As they build their magnetic detectors, they use the engineering design process, apply a variety of science concepts, and learn how a planet's or moon's magnetic field gives NASA scientists insights into its structure. Part of the "Design Squad Nation" series.
Cadmium is a chemical element with the symbol Cd and atomic number 48. It is a soft, silvery-white metal.
Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal.
Neptunium is a chemical element with the symbol Np and atomic number 93. It is a radioactive actinide metal.
Calcium is a chemical element with the symbol Ca and atomic number 20. It is an alkaline earth metal.
Showing collections 1 to 3 of 3
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
A collection of simulations from PhET.
A collection containing 15 resources, curated by Charles LaPierre
