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  • People looking at a computer screen. One person points to the screen. Inset of a closeup view with an area highlighted. Caption: You can see that there are two colors present--

    Ever wondered how art museums decide if a painting is a fake? Nate meets with Dr. Gregory Smith, a forensic art scientist, to follow a painting they suspect is a forgery. They use everything from x-ray fluorescence to electron microscopy to figure this case out. Part of the "Artrageous With Nate" series.

    (Source: DCMP)

  • Closeup view of very thin wires forming concentric squares and other geometric patterns. Caption: these circuits are thinner than a hair

    Imagine if there were electronics able to prevent epileptic seizures before they happen, or electronics that could be placed on the surface of a beating heart to monitor its functions. The problem is that such devices are a tough fit. Body tissue is soft and pliable while conventional circuits can be hard and brittle--at least until now. Materials scientist John Rogers at the University of Illinois Urbana-Champaign is working to develop elastic electronics.

    (Source: DCMP)

  • The periodic table of elements. A color-coded grid with letters representing each element. Caption: Each row of the table represents a pattern of chemical properties

    As scientists discovered more and more chemical elements, they began developing systems to organize the elements by their chemical properties, leading to the modern periodic table. Through its organization, the periodic table makes clear the underlying chemical and physical trends among the elements. The periodic table is being continually updated even today as scientists strive to create new elements in laboratories. Part of the series Chemistry: Challenges And Solutions.

    (Source: DCMP)

  • Computer screen showing a line graph of multiple measurements taken at different times. Caption: to add the ultra-fine layers of semiconducting materials

    With support from the National Science Foundation, Center Director Doug Keszler and his team in the College of Science at Oregon State University are developing the next generation of electronic circuits, starting with the basic computer chip. In the manufacturing process, they want to replace bulky carbon compounds with metal oxides, in order to put more transistors onto a chip. The new process would be cleaner, faster and cheaper. Part of the National Science Foundation Series “Science Nation.”

    (Source: DCMP)

  • Hollow glass tube with roughly diamond shaped object in the center surrounded by glowing light. Caption: you get the characteristic color of this purplish-blue.

    Using light as a probe, scientists found innovative ways to make inferences about the inner structure of the atom. In this unit, scientists discuss the change from believing the atom was a single indivisible particle to later understanding the atom is composed of subatomic parts. This new picture of matter lead to the development of the quantum model of the atom, as well as ways to identify traces of chemical elements, whether on earth, in the sun, or in a distant galaxy. Part of the series Chemistry: Challenges And Solutions.

    (Source: DCMP)

  • Bohr Diagrams

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    Bohr diagrams of elements from groups 1, 14, 17 and 18, and periods 1, 2 and 3 are shown. Period 1, in which the 1n shell is filling, contains hydrogen and helium. Hydrogen, in group 1, has one valence electron. Helium, in group 18, has two valence electrons. The 1n shell holds a maximum of two electrons, so the shell is full and the electron configuration is stable. Period 2, in which the 2n shell is filling, contains lithium, carbon, fluorine, and neon. Lithium, in group 1, has 1 valence electron. Carbon, in group 14, has 4 valence electrons. Fluorine, in group 17, has 7 valence electrons. Neon, in group 18, has 8 valence electrons, a full octet. Period 3, in which the 3n shell is filling, contains sodium, silicon, chlorine, and argon. Sodium, in group 1, has 1 valence electron. Silicon, in group 14, has 4 valence electrons. Chlorine, in group 17, has 7 valence electrons. Argon, in group 18, has 8 valence electrons, a full octet.

    Figure 2.7 (OpenStax, Biology 2e) caption: Bohr diagrams indicate how many electrons fill each principal shell. Group 18 elements (helium, neon, and argon) have a full outer, or valence, shell. A full valence shell is the most stable electron configuration. Elements in other groups have partially filled valence shells and gain or lose electrons to achieve a stable electron configuration.

    (Source: OpenStax)

  • Ionic Compound

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    A sodium and a chlorine atom sit side by side. The sodium atom has one valence electron, and the chlorine atom has seven. Six of chlorines electrons form pairs at the top, bottom and right sides of the valence shell. The seventh electron sits alone on the left side. The sodium atom transfers its valence electron to chlorines valence shell, where it pairs with the unpaired left electron. An arrow indicates a reaction takes place. After the reaction takes place, the sodium becomes a cation with a charge of plus one and an empty valence shell, while the chlorine becomes an anion with a charge of minus one and a full valence shell containing eight electrons.

    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.

    (Source: OpenStax)

  • Water Molecule

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    In the first image, an oxygen atom is shown with six valence electrons. Four of these valence electrons form pairs at the top and right sides of the valence shell. The other two electrons are alone on the bottom and left sides. A hydrogen atom sits next to each the lone electron of the oxygen. Each hydrogen has only one valence electron. An arrow indicates that a reaction takes place. After the reaction, in the second image, each unpaired electron in the oxygen joins an electron from one of the hydrogen atoms so that the valence rings are now connected together. The bond that forms between oxygen and hydrogen can also be represented by a dash.

    Figure 2.9 (OpenStax, Biology 2e) caption: Two or more atoms may bond with each other to form a molecule. When two hydrogens and an oxygen share electrons via covalent bonds it forms a water molecule.

    (Source: OpenStax)

  • Bohr Atomic Model

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    Three concentric circles around the nucleus of a hydrogen atom represent principal shells. These are named 1 n, 2 n, and 3 n in order of increasing distance from the nucleus. An electron orbits in the shell closest to the nucleus, 1 n.

    Figure 2.6 (OpenStax, Biology 2e) caption: In 1913, Niels Bohrs developed the Bohr model in which electrons exist within principal shells. An electron normally exists in the lowest energy shell available, which is the one closest to the nucleus. Energy from a photon of light can bump it up to a higher energy shell, but this situation is unstable, and the electron quickly decays back to the ground state. In the process, it releases a photon of light.

    (Source: OpenStax)

  • Geometric illustration of atoms. Caption: So here we've drawn in all the atoms.

    Molecules form when individual atoms create bonds by sharing electrons. Understanding how atoms combine to make molecules allows scientists to predict many of the physical and chemical properties of substances. Since the outermost eight electrons are key to forming compounds, this unit shows how the Octet Rule provides a basis for predicting how atoms may gain, lose, or share electrons to fill the slots in their outer shells. A fundamental understanding of how electrons form bonds leads to the three-dimensional shapes of molecules and has implications in all aspects of chemistry. Part of the series Chemistry: Challenges And Solutions.

    (Source: DCMP)

  • Atom Diagram

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    This illustration shows that, like planets orbiting the sun, electrons orbit the nucleus of an atom. The nucleus contains two neutrally charged neutrons, and two positively charged protons represented by spheres. A single, circular orbital surrounding the nucleus contains two negatively charged electrons on opposite sides.

    Figure 2.2 (OpenStax, Biology 2e) caption: Elements, such as helium, depicted here, are made up of atoms. Atoms are made up of protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus.

    (Source: OpenStax)

  • Illustration of an atom that has three full rings of electrons with unattached electrons floating around it. Spanish captions.

    Sherlock Olmos uses his famous detective skills to solve his mysterious case of how the periodic table is structured. With a touch of humor, he investigates electrons, valences, and the physical and chemical properties of some of the elements. Part of Chemistry: Solved by Sherlock Olmos Series.

    (Source: DCMP)

  • Illustration of an Na atom with no electrons on the third, outer ring. Caption: When an element loses all the electrons

    Sherlock Olmos decides to dig deeper into dark corner of this great house to investigate the suspicious behavior of some chemical elements. The exchange of electrons and the characteristics of hydrogen, fluorine gas, and the noble gases are the primary subjects of his investigation. Part of Chemistry: Solved by Sherlock Olmos Series.

    (Source: DCMP)

  • Diagram of a circuit showing a battery with leads on the positive and negative side and a lightbulb in the middle. Reduction. Caption: During this process, one substance must gain electrons,

    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.

    (Source: DCMP)

  • Mitochondria

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    Transmission electron micrograph of a mitochondrion shows an oval, outer membrane and an inner membrane with many folds called cristae. Inside of the inner membrane is a space called the mitochondrial matrix.

    This transmission electron micrograph of a mitochondrion shows an oval, outer membrane and an inner membrane with many folds called cristae. Inside of the inner membrane is a space called the mitochondrial matrix. Unlike prokaryotes, eukaryotic cells have a nucleus and other membrane-bound organelles that allow the cell to compartmentalize different functions. These videos will provide an overview of eukaryotic cells and will take you through the structures and functions of the various organelles found within the plasma membrane.

    (Source: OpenStax)

  • Atoms

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    Points of light streaking toward a central point. Caption: Matter is made up of tiny particles called atoms.

    What is an atom? It is the smallest particle of an element, and everything is made up of atoms. They consist of three basic particles: protons, electrons, and neutrons. The scientific community has experienced significant breakthroughs which have contributed to the understanding of atoms. Other topics covered include atomic number, atomic mass, Bohr model, electron cloud, and isotope.

    (Source: DCMP)

  • 17-Chlorine

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    3D model of the atom Chlorine

    Chlorine is a chemical element with the symbol Cl and it has atomic number 17. It has seven electrons in the third outermost shell acting as its valence electrons.

    (Source: Library Lyna)

  • Magnified view of roughly cube shaped object with a textured surface. Caption: (narrator) This is how one tiny grain of pollen looks

    Gives a general introduction to microscopes, a device invented 400 years ago. Begins with a simple magnifying glass and moves to the optical, confocal, electron, scanning electron, and the scanning tunneling microscopes. Shows that each one "sees" with increasing detail. The microscope opens invisible worlds and aids scientists in improving ours.

    (Source: DCMP)

  • Diagram of an atom with two shells displayed on a screen. Inner shell with two electrons is highlighted. Caption: because they aren't in the outermost shell.

    The formation of molecular bonds is an essential part of keeping matter together. The sharing of charges between atoms helps them become more stable. Other topics covered include sharing electrons, bonding tendencies, isomers, VSEPR theory, and molecular geometry. Part of the "Chemistry" series.

    (Source: DCMP)

  • Periodic table of elements. Caption: In the case of the groups with lithium and fluoride,

    Sherlock Olmos uses his famous detective skills to solve his mysterious case of how the periodic table is structured. With a touch of humor, he investigates electrons, valences, and the physical and chemical properties of some of the elements. Part of Chemistry: Solved by Sherlock Olmos Series.

    (Source: DCMP)

Collections

5

Showing collections 1 to 5 of 5

  • Biology

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    Biology related concepts

    A collection containing 59 resources, curated by Benetech

  • Chemistry

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    • Simulation

    A collection of Chemistry related resources

    A collection containing 67 resources, curated by Benetech

  • Elements

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    • 3D Model

    3D models and images of the entire periodic table of elements

    A collection containing 118 resources, curated by Library Lyna

  • PhET Simulations

    • Simulation

    A collection of simulations from PhET.

    A collection containing 15 resources, curated by Charles LaPierre

  • Vision

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    • Video

    Resources related to vision

    A collection containing 12 resources, curated by Charles LaPierre