https://www.khanacademy.org/science/grade-6-science-snc-aligned/x19bc096754f0b9af:elements-and-compounds/x19bc096754f0b9af:metals-and-non-metals/v/intro-to-physical-properties-of-metals-metals-and-non-metals-chemistry-khan-academy 2020-08-26T05:42:18Z Intro to physical properties of metals Let's see what are some common physical properties of metals. Sal Khan video https://cdn.kastatic.org/googleusercontent/FhwDrUWq8AGcB38INo8z0Z89LzMQ3bn5koT8qORkFZlqWyCCBZvrh7crj4ylnw9Ykhb6TQlW4CU78Eh-xpooDJI Intro to physical properties of metals Let's see what are some common physical properties of metals. https://cdn.kastatic.org/ka-youtube-converted/AdXN2OTBxG0.mp4/AdXN2OTBxG0.mp4 328 Properties, processing, and sustainability https://www.khanacademy.org/science/bmc-grade-10-science/x4e98504963be64d8:metallurgy/x4e98504963be64d8:untitled-335/v/concentration-of-ores 2025-12-04T06:30:51.593616006Z Concentration of ores This video explains how pure metals are obtained from ores through different concentration methods. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Concentration of ores This video explains how pure metals are obtained from ores through different concentration methods. https://cdn.kastatic.org/ka-youtube-converted/Eseh8Zh73nU.mp4/Eseh8Zh73nU.mp4 287 Properties, processing, and sustainability https://www.khanacademy.org/science/strengthened-shs-earth-and-space-science-1/x006d5d274c051fd7:earth-s-materials-and-resources/x006d5d274c051fd7:minerals-and-their-uses/v/reduction-of-metal-oxides-extraction-of-metals-pk 2025-12-18T18:40:53.641757593Z Reduction of metal oxides - Extraction of metals Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Reduction of metal oxides - Extraction of metals Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/owY-nfRavN4.mp4/owY-nfRavN4.mp4 508 Properties, processing, and sustainability https://www.khanacademy.org/science/grade-12-chemistry-snc-aligned/x7a43e770fc9e15cf:materials/x7a43e770fc9e15cf:properties-processing-and-sustainability/v/electrolytic-refining-of-metals-pk 2025-12-18T18:40:53.641757593Z Electrolytic refining of metals Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Electrolytic refining of metals Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/XS08dDCZX8U.mp4/XS08dDCZX8U.mp4 764 Properties, processing, and sustainability https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:kinetics/x2eef969c74e0d802:catalysis/v/catalysts 2021-01-30T09:09:58Z Catalysts A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the reaction. A catalyst works by providing a different pathway for the reaction, one that has a lower activation energy than the uncatalyzed pathway. This lower activation energy means that a larger fraction of collisions are successful at a given temperature, leading to an increased reaction rate. Jay video https://cdn.kastatic.org/googleusercontent/c8S4ZI4SSEdwd-pHMlE2cqXhqaZDYTbL63DCxb2K3mvTIlpDbr3CAoROYi3FCFJqKACnDJJ0s91vi2-DxyK6YaU Catalysts A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the reaction. A catalyst works by providing a different pathway for the reaction, one that has a lower activation energy than the uncatalyzed pathway. This lower activation energy means that a larger fraction of collisions are successful at a given temperature, leading to an increased reaction rate. https://cdn.kastatic.org/ka-youtube-converted/if5JGssffm8.mp4/if5JGssffm8.mp4 450 Properties, processing, and sustainability https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:aquatic-and-terrestrial-pollution/x0b0e430a38ebd23f:pollution-and-health/v/pollution-and-human-health 2024-06-21T23:15:14.703721694Z Pollution and human health Air pollution (via toxic gases, particulate matter, and chemicals) can lead to a range of health issues, including respiratory and cardiovascular illnesses. Linking specific pollutants to health issues via multiple routes of exposure is challenging, as shown by an example connecting asbestos and mesothelioma, a type of cancer. Environmental regulations are key to protecting public health. Wieteke Holthuijzen video https://cdn.kastatic.org/ka_thumbnails_cache/a6008da9-2931-489b-b2e9-f20116a56b71_1280_720_base.png Pollution and human health Air pollution (via toxic gases, particulate matter, and chemicals) can lead to a range of health issues, including respiratory and cardiovascular illnesses. Linking specific pollutants to health issues via multiple routes of exposure is challenging, as shown by an example connecting asbestos and mesothelioma, a type of cancer. Environmental regulations are key to protecting public health. https://cdn.kastatic.org/ka-youtube-converted/miaewHG2-X0.mp4/miaewHG2-X0.mp4 386 Properties, processing, and sustainability https://www.khanacademy.org/science/ms-chemistry/xc370bc422b7f75fc:physical-properties-of-matter/xc370bc422b7f75fc:intrinsic-and-extrinsic-properties/a/physical-properties-and-changes 2025-08-07T20:06:55.282146473Z Physical properties and changes Learn about the observable characteristics of matter such as color, texture, melting point, and conductivity that can be measured without changing the substance's identity. Discover how physical changes like cutting, melting, and dissolving alter the appearance or state of matter while keeping the same chemical composition. article https://www.khanacademy.org/science/bmc-grade-10-science/x4e98504963be64d8:metallurgy/x4e98504963be64d8:untitled-335/e/concentration-of-ores-physical-methods 2025-12-02T11:50:42.481657214Z Concentration of ores - Physical methods This exercise explores how ores are purified before extraction through physical methods such as the gravitation method and magnetic separation. Students learn how gangue is removed, why specific methods are chosen for different types of ores, and how physical properties like density and magnetic behaviour help in the concentration of ores. Yajurva Joshi exercise https://www.khanacademy.org/science/telangana-class-10-physical-sciencein/x1ac9c643dc8dffee:principles-of-metallurgy/x1ac9c643dc8dffee:a-few-important-processes-used-in-metallurgy/e/roasting-and-calcination 2026-03-31T01:02:11.609621879Z Roasting and calcination Let's practice on identify the metal oxides which can be roasted and calcined. Chaitra exercise https://www.khanacademy.org/science/biology/dna-as-the-genetic-material/dna-discovery-and-structure/a/discovery-of-the-structure-of-dna 2023-09-14T11:07:34.466749579Z Discovery of the structure of DNA The structure of DNA double helix and how it was discovered. Chargaff, Watson and Crick, and Wilkins and Franklin. article