Kemi - www.matnat.org Vissa ord är lätta att blanda ihop för att de stavas snarlikt. Här nedan ges några vanliga exempel på när man bör hålla tungan rätt i munnen vid stavning. Glukos - GlykolGlukos är en hexos och en aldos, det vill säga en monosackarid och en enkel sockerart. Hydroxid - HydroxylHydroxid är den minusladdade jonen OH- som är stark bas och det man mäter vid pOH. Bensen - BensinBensen är ett aromatiskt kolväte med sex kolatomer i hexagonal (ringformad) struktur. Kolväte - KolhydratKolväten är organiska molekyler uppbyggda av kol och väte. Fragment - FraktionFragment kan vara en del av en molekyl som bildas vid masspektrometri (MS) innan fragmenten analyseras med avseende på storlek och laddning.Fraktion är en del av en lösning som samlats i ett kärl vid till exempel vätskekromatografi (HPLC). Grupp - Funktionell gruppEn grupp brukar avse en grupp i det periodiska systemet, till exempel alkalimetallerna, halogenerna eller ädelgaserna.
Educational Videos and Games for Kids about Science, Math, Social Studies and English Web Study List - Overview of knowledge and educational resources available online Christopher Thornton I've had loads of people asking why I only target C grades in some of my videos, asking if they're relevant to them, and requesting more higher tier content. This video explains how it all works and why I've organised things in the way I have. Try the Snapquiz: Get the app at: Download a revision guide for Kindle at ChemCollective: Concept Tests Our concept tests use qualitative multiple choice questions to assess the understanding of key chemical concepts. (Please email us for answers and suggested classroom uses). Thermochemistry Energy and Enthalpy Thermodynamics Concept Test Concept tests that can be used as part of in-class activities to help students reason about energy and work. Equilibrium LeChatlier's Principle Chemical Equilibria Concept Test These equilibrium based concept tests can be used as part of in-class activities to help students reason about equilibrium concepts. Progress of Reaction Chemical Equilibria Concept Test These equilibrium based concept tests can be used as part of in-class activities to help students reason about equilibrium concepts. Equilibrium Calculations Chemical Equilibria Concept Test These equilibrium based concept tests can be used as part of in-class activities to help students reason about equilibrium concepts.
If atoms are mostly empty space, why do objects look and feel solid? Chemist John Dalton proposed the theory that all matter and objects are made up of particles called atoms, and this is still accepted by the scientific community, almost two centuries later. Each of these atoms is each made up of an incredibly small nucleus and even smaller electrons, which move around at quite a distance from the centre. If you imagine a table that is a billion times larger, its atoms would be the size of melons. But even so, the nucleus at the centre would still be far too small to see and so would the electrons as they dance around it. So why don’t our fingers just pass through atoms, and why doesn’t light get through the gaps? To explain why we must look at the electrons. Electrons ‘dance’ In fact, electrons dance – there is no better word for it. These patterns can vary – some are slow and gentle, like a waltz whereas some are fast and energetic, like a Charleston. Although electrons never tire, moving up to a faster step does take energy. Resistance when touched
Grant Thompson Call it "Mad Science", or just a "Quest for Discovery". These are some of my experiments, and "Random Weekend Projects" Subscribe! New videos every week! WARNING: In many cases, these projects are dangerous and pose risks of personal, or property damage, injury, and in some cases, death. There are some mind-blowing loopholes in this version of life, that for some reason, haven't been issued a patch. I make weekly videos dedicated to exploring life through all kinds of projects, experiments, and real-world life-hacking. Every project is a completely different adventure, and occasionally you'll see an experiment that probably shouldn't be duplicated at all.
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