untitled Quick Details ProName: Panthenyl ethyl etherCasNo: 667-83-4LimitNum: 0 Superiority D-Panthenyl Ethyl Ether Popular Name: Provitamin B5 ; D-Panthenyl alcohol ; D-Panthenol ; Dexpanthenol INCI Name: Panthenyl Ethyl Ether/Ethyl… Details D-Panthenyl Ethyl Ether Popular Name: Provitamin B5 ; D-Panthenyl alcohol ; D-Panthenol ; Dexpanthenol INCI Name: Panthenyl Ethyl Ether/Ethyl Panthenol Molecular Formula: C11H13NO4 Molecular Weight: 233.31 CAS NO.: 667-83-4 Structural Formula: Appearance and Character: D-Panthenyl Ethyl Ether is a yellowish or colorless, clear, slightly viscous liquid. 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
Periodic Table of the Elements by WebElements Radon Home Page | Indoor Air | US Environmental Protection Agency Radon Standards of Practice Learn how the radon standards benefit your work, proposals, call for bids, etc. Listen to or read this webinar for the latest information on radon industry standards of practice available through American Association of Radon Scientists and Technologists (AARST) .Gary Hodgden, Chair of the Executive Stakeholder Committee for the AARST Consortium on National Radon Standards, Melinda Ronca-Battista, Health Physicist currently at Northern Arizona University in the Institute for Tribal Environmental Programs, and Jani Palmer, Scientist at EPA, Office of Air present this webinar. Radon Leaders Saving Lives Leaders from The Conference of Radiation Control Program Directors, Inc. Driving Radon Action and Awareness at the Federal Level Mr. Managing Radon in Schools (PDF, 3 pp, 391K) As part of an effective IAQ management program, schools should test for radon to know if radon levels are elevated — and if so, reduce risks to occupants through radon mitigation.
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 ..... ..... ..... .....
ChemCollective A Citizen's Guide to Radon | Radon | US Environmental Protection Agency The Guide to Protecting Yourself and Your Family From Radon U.S. EPA/OAR/IED (6609J) EPA 402-K-12-002, May 2012 [Please note, the Spanish version of the Citizen's Guide has not been updated. EPA Recommends Test your home for radon — it's easy and inexpensive.Fix your home if your radon level is 4 picocuries per liter, or pCi/L, or higher.Radon levels less than 4 pCi/L still pose a risk, and in many cases may be reduced. Radon is estimated to cause thousands of lung cancer deaths in the U.S. each year. * Radon is estimated to cause about 21,000 lung cancer deaths per year, according to EPA's 2003 Assessment of Risks from Radon in Homes (EPA 402-R-03-003). Top of page Overview Radon is a cancer-causing, radioactive gas. You can't see radon. Radon is estimated to cause many thousands of deaths each year. Radon can be found all over the U.S. Radon comes from the natural (radioactive) breakdown of uranium in soil, rock and water and gets into the air you breathe. You should test for radon. Step 1.
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. 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. 50 Really Cool Online Tools for Science Teachers A 21st-century education revolves around the Internet for everything from collaboration, tools, lessons, and even earning degrees online. If you are looking for ways to integrate online learning into your science class or science degree programs, then take a look at these cool online tools that are just perfect for both teachers and students. Science Tools to Use with Students These tools offer opportunities for learning about climate, cells, the human body, nature, and more. ChemiCool. AP Tools Whether you are setting up a new AP curriculum or are just looking for additional material to use with your AP science students, these tools will help. Advanced Placement Biology. Websites and Resources for Science Teachers These websites are chock full of amazing resources and tools for science teachers. Discovery Education. Calculators Use these informative environmental calculators with your students. Ecological Footprint Quiz. Online Games Online Science Games. Google Earth Google Earth Ocean.
FAQ Will dryer sheets or eating special herbs and spices, garlic, vitamin B-1, or bananas ward off biting insects? There is a long list of “repellent” urban legends, including these. NONE of these approaches work reliably. If you want to be protected from insect and tick bites, use a DEET-based repellent. Back to Top Do herbal oils, skin lotions, “natural” plant extracts mixed in oil, and homeopathic approaches repel biting insects? Most of these work for about 20 minutes and are no more effective than smearing cooking oil on your skin. In the prestigious New England Journal of Medicine, Richard J. Does DEET cause seizures in children? This recurring rumor is without scientific foundation. I have read something about DEET causing neurological symptoms in laboratory animals in studies at a well-known university. The researcher conducting studies used DEET mixed with known neurotoxins, so a neurological finding is not unusual or unexpected in this instance. Can DEET be used with sunscreen? No.
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.