In this exercise, students use whole-rock major- and trace-element compositions of volcanic …
In this exercise, students use whole-rock major- and trace-element compositions of volcanic rocks to explore the origins of compositional variation in igneous suites. Large datasets from the Yellowstone and Crater Lake calderas are downloaded from the GEOROC database, imported into Excel spreadsheets, and graphed to learn about the different petrogeneses of these two volcanic suites.
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In this exercise, students use whole-rock major- and trace-element compositions of volcanic …
In this exercise, students use whole-rock major- and trace-element compositions of volcanic rocks to explore the origins of compositional variation in igneous suites. With the help of detailed step-by-step instructions, datasets from the Yellowstone and Crater Lake calderas are downloaded from the GEOROC database, imported into Excel spreadsheets, and graphed in the form of "Harker" diagrams to learn about the different petrogeneses of these two volcanic suites.
(Note: this resource was added to OER Commons as part of a batch upload of over 2,200 records. If you notice an issue with the quality of the metadata, please let us know by using the 'report' button and we will flag it for consideration.)
The theoretical frameworks of Hartree-Fock theory and density functional theory are presented …
The theoretical frameworks of Hartree-Fock theory and density functional theory are presented in this course as approximate methods to solve the many-electron problem. A variety of ways to incorporate electron correlation are discussed. The application of these techniques to calculate the reactivity and spectroscopic properties of chemical systems, in addition to the thermodynamics and kinetics of chemical processes, is emphasized. This course also focuses on cutting edge methods to sample complex hypersurfaces, for reactions in liquids, catalysts and biological systems.
Students investigate the property dependence between concentrations and boiling point. In section …
Students investigate the property dependence between concentrations and boiling point. In section 1, students first investigate the boiling point of various liquid solutions. In section 2, they analyze data collected by the entire class to generate two boiling point curves, one for salt solutions and one for sugar solutions. Finally, in section 3, students use the data they have analyzed to determine how to create a solution that has a particular boiling point and is a cost-effective design.
This video is about concentration cells. Video describes about how electricity can …
This video is about concentration cells. Video describes about how electricity can be generated using same electrode and same electrolyte at differ concentrations.
A concentration gradient occurs when the concentration of particles is higher in …
A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.
"Concept Development Studies in Chemistry" is an on-line textbook for an Introductory …
"Concept Development Studies in Chemistry" is an on-line textbook for an Introductory General Chemistry course. Each module develops a central concept in Chemistry from experimental observations and inductive reasoning. This approach complements an interactive or active learning teaching approach.
This interactive, scaffolded activity allows students to build an atom within the …
This interactive, scaffolded activity allows students to build an atom within the framework of a newer orbital model. It opens with an explanation of why the Bohr model is incorrect and provides an analogy for understanding orbitals that is simple enough for grades 8-9. As the activity progresses, students build atoms and ions by adding or removing protons, electrons, and neutrons. As changes are made, the model displays the atomic number, net charge, and isotope symbol. Try the "Add an Electron" page to build electrons around a boron nucleus and see how electrons align from lower-to-higher energy. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology. The Concord Consortium develops deeply digital learning innovations for science, mathematics, and engineering. The models are all freely accessible. Users may register for additional free access to capture data and store student work products.
This interactive activity helps learners visualize the role of electrons in the …
This interactive activity helps learners visualize the role of electrons in the formation of ionic and covalent chemical bonds. Students explore different types of chemical bonds by first viewing a single hydrogen atom in an electric field model. Next, students use sliders to change the electronegativity between two atoms -- a model to help them understand why some atoms are attracted. Finally, students experiment in making their own models: non-polar covalent, polar covalent, and ionic bonds. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology.
Interactive STEM activities, free for your classroom. Bring out the inner scientist …
Interactive STEM activities, free for your classroom. Bring out the inner scientist in all your students with our scientifically accurate models and activities. Search below or head over to our NGSS Pathfinder! We’ve been expanding and deepening STEM inquiry with technology for over 20 years. Our free, cutting-edge tools and resources have brought STEM practices to life for over a million learners worldwide. Lessons: • Atomic Structure • Boiling Point • Catalysts • Ceramic Forces • Charged and Neutral Atoms • Comparing Dipole-Dipole to London Dispersion • Concentrating Charge and Electric Fields • Crookes Tube • Diffusion Across a Semipermeable Membrane • Diffusion and Molecular Mass • Diffusion and Temperature • Diffusion of a Drop • Electrons in Atoms and Molecules • Exploring Electron Properties • Factors Affecting London Dispersion Attractions • Gas Laws & Human Biology • Gas Laws & Weather Balloons • Hydrogen Bonds: A Special Type of Attraction • Intermolecular Attractions and States of Matter • Metal Forces • Molecular View of a Gas • Molecular View of a Liquid • Molecular View of a Solid • Oil and Water • Phase Change • Plastic Forces • Polarity and Attractive Strength • Seeing Intermolecular Attractions • States of Matter • The Temperature-Pressure Relationship • The Temperature-Volume Relationship • The Volume-Pressure Relationship • Tire Forces • What is Pressure?
This 90-minute activity features six interactive molecular models to explore the relationships …
This 90-minute activity features six interactive molecular models to explore the relationships among voltage, current, and resistance. Students start at the atomic level to explore how voltage and resistance affect the flow of electrons. Next, they use a model to investigate how temperature can affect conductivity and resistivity. Finally, they explore how electricity can be converted to other forms of energy. The activity was developed for introductory physics courses, but the first half could be appropriate for physical science and Physics First. The formula for Ohm's Law is introduced, but calculations are not required. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology. The Concord Consortium develops deeply digital learning innovations for science, mathematics, and engineering.
This concept-building activity contains a set of sequenced simulations for investigating how …
This concept-building activity contains a set of sequenced simulations for investigating how atoms can be excited to give off radiation (photons). Students explore 3-dimensional models to learn about the nature of photons as "wave packets" of light, how photons are emitted, and the connection between an atom's electron configuration and how it absorbs light. Registered users are able to use free data capture tools to take snapshots, drag thumbnails, and submit responses. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology.
In this interactive activity, learners explore factors that cause atoms to form …
In this interactive activity, learners explore factors that cause atoms to form (or break) bonds with each other. The first simulation depicts a box containing 12 identical atoms. Using a slider to add heat, students can see the influence of temperature on formation of diatomic bonds. Simulations #2 and #3 introduce learners to reactions involving two types of atoms. Which atom forms a diatomic molecule more easily, and why? The activity concludes as students explore paired atoms (molecules). In this simulation they compare the amount of energy needed to break the molecular bonds to the energy needed to form the bonds. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology.
In this interactive activity, learners build computer models of atoms by adding …
In this interactive activity, learners build computer models of atoms by adding or removing electrons, protons, and neutrons. It presents the orbital model of an atom: a nucleus consisting of protons and neutrons with electrons surrounding it in regions of high probability called orbitals. Guided tasks are provided, such as constructing a lithium atom and a carbon-12 atom in the fewest possible steps. The activity concludes with a model for building a charged hydrogen atom (an ion). Within each task, students take snapshots of their work product and answer probative questions. This item is part of the Concord Consortium, a nonprofit research and development organization dedicated to transforming education through technology.
How can we conduct scientific research so that we have evidence to …
How can we conduct scientific research so that we have evidence to support a claim?Students in this problem-based learning module are invited to design a testable question to guide Scientific Research, Evaluate the pH of various solutions, Identify Variables, Conduct a Scientific Investigation, and Analyze/Communicate results. How can we conduct scientific research so that we have evidence to support a claim? Antacid tablets are a multi-billion dollar industry. Claims are made regularly by certain brands that their extra strength tablets contain “DOUBLE the acid neutralizing power per tablet of regular strength antacids.” How effective are antacids? Are double-strength antacids twice as effective as regular strength antacids? Have you ever noticed a parent/guardian/family member take an antacid tablet? Stomach chemistry is about acids and bases. When the pH of a stomach is too acidic then it might make the person have a stomach ache. In some cases “heartburn” or “acid reflux” are used as terms to describe the problems some people face. Antacids are usually basic which, when taken, might help raise the pH level in a stomach thus making a person feel better.You are invited to design an investigation with a partner, or a team of 4 students, to test your own idea about the effectiveness of antacids. The challenge? Have a driving question, clear variable identification, and an analysis of your results. Materials for your test will be provided to you by your teacher. At the culmination of your investigation your design team will make a 30-second pitch on your phone to show at your family Thanksgiving meal to explain the benefits (or negatives) of using antacids, and how antacids work.
It this exercise the students will discover that pure water does not …
It this exercise the students will discover that pure water does not conduct electricity and that dissolving different substances in water may or may not cause it to conduct electricity.
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