UNC Chemistry Fundamentals An Interactive Educational Exercise Because of special formatting tags needed to display exponents, this site is best viewed with Netscape 3.0 or higher. If needed, use the link under Useful Materials to download Netscape About the Chemistry Fundamentals Course This exercise is designed for anyone who wants an introduction or review of the fundamentals of chemistry that will be used in freshman level chemistry classes. This interactive course was used for the first time during the summer of 1997. Evaluations from last year's materials suggested that, while the mathematics and calculator sections were useful, one of the most appreciated benefits of the materials was the review of basic high school chemistry. Currently, this site is used as a resource that can be beneficial to any student that is enrolled in a freshman chemistry course. About these materials How to use these materials The basic procedure is as follows:Take the pre-test for a certain sections. About the Sidebar
Přehled minerálů a hornin | E-learning Katedry biologie PdF MU Ve formě emulzních uzavřenin obsahuje Au, Ag, Bi, Ni a v malém množství někdy Co, tzv. danait. Jednoklonný (monoklinický, pseudorombický). Agregáty zrnité a celistvé, případně stébelnaté. Vytváří často kosočtverečné, dlouze nebo krátce sloupcovité krystaly, rýhované podle vertikály. Barva cínově bílá (rozdíl od pyritu), oxidací přechází do žluté. tvrdost: 5,5 - 6hustota: 5,9 - 6,3 g . cm-3 Animace krystalových soustav Výskyt Hlavní část přírodního arzenopyritu vznikla za vyšších teplot hydrotermální fáze. Význam Na některých lokalitách je zlatonosný, např. v polském Zlotém Stoku.
Chemistry Homework Help Get help for your chemistry homework! You'll find a variety of resources, from ask-an-expert, online converters and calculators, study guides, dictionaries, a review of math/science fundamentals, and examples of worked problems. Chemistry AnswersStudents often ask "How do I get answers to chemistry questions online?" There are several ways to find answers and to ask chemistry questions and get them answered. Here is what you do. Chemistry Help VideosLearn chemistry and reinforce your understanding of chemistry concepts by watching these chemistry videos. Best Chemistry Study TipsDid you take a chemistry class and have a really great way to study? How to Pass ChemistryAre you taking a chemistry class? Chemistry Study TipsHere are some homework and study tips to help you succeed in chemistry. How to Write a Lab ReportLab reports are an essential part of all laboratory courses and usually a significant part of your grade. Learn ChemistryLearn chemistry!
Online chemical modeling environment (OCHEM): web platform for data storage, model development and publishing of chemical information Výukový portál | [CH] 2. st. - Chemie Základní škola Kpt. Jaroše získala v rámci grantových projektů ESF 4 441 019,42,- Kč na realizaci dvou projektů.Školní a webové informační centrum Cílem projektu je umožnit žákům přístup k učivu, které bude zpracováno v elektronické podobě a zpřístupněno ve školním nebo webovém informačním centru. Předpokladem je, že služby centra budou moci využívat žáci školy v průběhu svého vzdělávání na základní škole i po jeho skončení. Součástí projektu bylo i vybudování školního informačního centra s počítači a interaktivní tabulí. Školní a webové informační centrum pro 1. stupeň základní školyCílem projektu je umožnit žákům 1. stupně přístup k učivu, které bude zpracováno v elektronické podobě a zpřístupněno ve školním nebo webovém informačním centru.
50 Awesome Chemistry Videos For The Busy Science Teacher Though we don’t often recognize it, chemistry defines nearly every element of our everyday lives. From the reactions that fuel the sun to the biology of our bodies to the technology in our gadgets, chemistry is at the heart of everything we do and is the central science that unites biology, physics, geology, astronomy, medicine, and countless other fields. Yet chemistry doesn’t always get the credit and recognition it deserves for playing such an awesome role in, well, everything. If you’ve been slighting chemistry, there’s no better time to give the field the credit it deserves than National Chemistry Week. Founded in 1987, the week-long event has helped bring awareness to the role chemistry plays both in our lives today and in our future. You can get in the spirit of the event by checking out a few (or all) of these amazing chemistry videos online. Amazing Reactions and Experiments Brainiac: Thermite and Liquid Nitrogen: Think thermite reactions are super awesome? Lectures Courses Fun
Conductive Polymers Lists of Nobel Prizes and Laureates Conductive Polymers Play the Conductive Valley Game About the game Find out what you can use conductive polymers for in the future by furnishing a house! Read More » The Nobel Prize The 2000 Nobel Prize in Chemistry was awarded for the discovery that plastic can, after certain modifications, be made electrically conductive. Share this: Share on facebook Share on google_plusone_share Share on twitter More Sharing Services9 Share on email To cite this pageMLA style: "Conductive Polymers". Recommended: The Legacy of Alfred Nobel On 27 November 1895 Alfred Nobel signed his last will in Paris. Play the Blood Typing Game Try to save some patients and learn about human blood types! Unlocking the Secrets of Our Cells Discover the 2012 awarded research on stem cells and cell signalling. Contact E-mail us Press Sitemap A-Z Index Frequently Asked Questions Terms Follow Contact | Press | Sitemap | FAQ | Terms Copyright © Nobel Media AB 2014 Follow us: Follow us: Facebook Google+ Twitter
Biochemie - vzdělávací portál, Úvodní stránka Bond Energy If we pass a direct electric current through water containing enough ions to make it a good electrical conductor, it will break down into its constituents: hydrogen and oxygen. Both hydrogen and oxygen gas exist as diatomic molecules so the equation for this chemical reaction is The prefixes tell us that it takes 2 molecules of water to produce one molecule of oxygen and two molecules of hydrogen. If we decompose 36 grams of water (2 moles), we produce 2 moles of hydrogen gas (4 g) and one mole of oxygen gas (32 g). In this reaction, covalent bonds between the hydrogen atoms and oxygen atom in water have been broken and new bonds — between the hydrogen atoms in H2 and the oxygen atoms in O2 — have been formed. Bond Energy For any particular chemical bond, say the covalent bond between hydrogen and oxygen, the amount of energy it takes to break that bond is exactly the same as the amount of energy released when the bond is formed. Let's look at the numbers. What is free energy?
MSDS ARCHIVE FOR THE CNTECH LABORATORIES MSDS (Material Safety Data Sheets) at CNTech Etchants, adhesives, plating baths, etc. Safety Information All chemicals at CNTech can be idenrified by their CAS (Chemical Abstract Service) Registry Number. This is a unique identifier that tells you, for example, that acetone and dimethyl ketone are actually the same substance. The Synchrotron Radiation Center (SRC) has a safety manual available on the Web. More information is available from the SRC Safety Officer, Bruce Neumann All chemicals at CNTech should be labeled with a hazard code chart, like the one shown below. Blue – Health Red – Flammability Yellow – Reactivity White – Special precautions For a more detailed explanation of these hazard codes, start here . Other Reference Materials A table of synonyms, structures, and uses of some common lithography molecules can be found here. Evaporation Return to the main CNTech Labs page This MSDS collection is under construction and may not include all chemicals found in the CNTEch labs. Acetic acid HBr Al
Plasmas Plasmas exist in a wide range of settings and varieties. Most stars are made up of plasma. The Aurora Borealis is a plasma light show in our upper atmosphere caused by the bombardment from space of the solar wind - another kind of plasma. Lightning bolts are visible plasma trails left by the passage of the electric current that formed it. As stated in the definition, plasma is a gaseous type of state where the matter making the plasma consists of electrically neutral and charged particles. Accelerating electrons through ordinary gas can create plasma, in just the way they create lightning. If you do it in a very low pressure gas - something like the interior of an incandescent light bulb - you usually just get a kind of diffuse glow. How does a Plasma Globe Work? We apply an electric voltage to the metal electrode in the center of the plasma globe. Simultaneously, we create a changing electric field inside the globe with another, oscillating electric voltage on the electrode.