https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:solids-liquids-and-gases/v/representing-solids-liquids-and-gases-using-particulate-models 2022-10-05T02:43:18.611402953Z Representing solids, liquids, and gases using particulate models In this video, we'll learn how to represent solids, liquids, and gases using particulate models. The particles in a solid are either highly ordered (if the solid is crystalline) or have no regular arrangement (if the solid is amorphous). In both cases, the motion of the particles is limited. The particles in a liquid are close together and are constantly moving and colliding. Finally, the particles in a gas are generally well-separated and are in constant, random motion. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/4afb6fa0-d848-4ae6-8e3f-41ea2c33569a_1280_720_base.png Representing solids, liquids, and gases using particulate models In this video, we'll learn how to represent solids, liquids, and gases using particulate models. The particles in a solid are either highly ordered (if the solid is crystalline) or have no regular arrangement (if the solid is amorphous). In both cases, the motion of the particles is limited. The particles in a liquid are close together and are constantly moving and colliding. Finally, the particles in a gas are generally well-separated and are in constant, random motion. https://cdn.kastatic.org/ka-youtube-converted/4Q45iIeMdCM.mp4/4Q45iIeMdCM.mp4 291 Structures and one-dimensional deformation of solids https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:solids-liquids-and-gases/e/solids-liquids-and-gases 2023-08-07T17:25:22.494770007Z Solids, liquids, and gases Practice interpreting particulate models of solids, liquids, and gases in this set of free questions designed for AP Chemistry students. exercise https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:solids-liquids-and-gases/v/crystalline-and-amorphous-polymers 2022-10-05T02:43:18.611402953Z Crystalline and amorphous polymers Polymers can exist as both crystalline and amorphous solids. In fact, most polymers are semicrystalline, which means that they contain a mixture of crystalline and amorphous regions. In this video, we'll see different examples of semicrystalline and amorphous polymers and learn how their structures can be represented using particulate models. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/eeff6706-f255-46df-9f52-3204fdaf6d1f_1280_720_base.png Crystalline and amorphous polymers Polymers can exist as both crystalline and amorphous solids. In fact, most polymers are semicrystalline, which means that they contain a mixture of crystalline and amorphous regions. In this video, we'll see different examples of semicrystalline and amorphous polymers and learn how their structures can be represented using particulate models. https://cdn.kastatic.org/ka-youtube-converted/p5mXv39n9GM.mp4/p5mXv39n9GM.mp4 282 Structures and one-dimensional deformation of solids https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:molecular-and-ionic-compound-structure-and-properties/x2eef969c74e0d802:structure-of-metals-and-alloys/v/representing-alloys-using-particulate-models 2021-04-13T17:49:49Z Representing alloys using particulate models An alloy is a mixture of two or more elements, of which at least one is a metal. There are two main types of alloys: interstitial alloys, which form between atoms of different radii, and substitutional alloys, which form between atoms of similar radii. In this video, we'll learn how to represent the different types of alloys using particulate models. Sal Khan video https://cdn.kastatic.org/googleusercontent/uqGHD5vVG3xk6s9kL28sSa8LxAD3LEB6vzLqmPlXCm0ePVbknjRO2qpOuKnhXGhMvrosdMt9HJusG_S3vChxKds5 Representing alloys using particulate models An alloy is a mixture of two or more elements, of which at least one is a metal. There are two main types of alloys: interstitial alloys, which form between atoms of different radii, and substitutional alloys, which form between atoms of similar radii. In this video, we'll learn how to represent the different types of alloys using particulate models. https://cdn.kastatic.org/ka-youtube-converted/LTH-WH97zbo.mp4/LTH-WH97zbo.mp4 390 Structures and one-dimensional deformation of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/elastic-and-non-elastic-materials 2020-06-23T07:22:42Z Elastic and non elastic materials Is steel more elastic than rubber? We all have some intuition for elastic and non-elastic materials. But how do we define elasticity? How do we say whether something is more or less elastic? In this video, we will explore the true meaning of elasticity. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Rtkj_VLPYkprE1kpX9ckJ8vfJLG_b2xO5AsZDCB3HXdvgox5p9B_dk7z6gIlTXw54AZ0q12mUqM3eBDhtWTV-xfUBA Elastic and non elastic materials Is steel more elastic than rubber? We all have some intuition for elastic and non-elastic materials. But how do we define elasticity? How do we say whether something is more or less elastic? In this video, we will explore the true meaning of elasticity. https://cdn.kastatic.org/ka-youtube-converted/PUB_gAm4LCA.mp4/PUB_gAm4LCA.mp4 711 Structures and one-dimensional deformation of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/e/elastic-potential-energy 2025-05-22T20:00:19.681517034Z Elastic Potential Energy Elastic Potential Energy Chandan Ganotra exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-work-energy-and-power/in-in-class11-spring-potential-energy-and-hookes-law/a/what-is-elastic-potential-energy 2021-07-03T07:15:37Z What is elastic potential energy? Learn what elastic potential energy means and how to calculate it. article