http://chemistry.forumotion.com/questions-and-answers-f1/-t1.htm If you need some help on a certain chemistry aspect, post here. Mon, 23 Nov 2009 04:03:23 GMT 10 http://i75.servimg.com/u/f75/13/25/02/55/extend14.jpg http://chemistry.forumotion.com/questions-and-answers-f1/-t1.htm http://chemistry.forumotion.com/questions-and-answers-f1/trends-in-periodic-table-groups-t247.htm shelpey rank the group IIA metal ions from the one with the least negative hydration energy to the most negative hydration energy Questions and Answers Mon, 23 Nov 2009 04:03:23 GMT http://chemistry.forumotion.com/questions-and-answers-f1/trends-in-periodic-table-groups-t247.htm#552 http://chemistry.forumotion.com/questions-and-answers-f1/trends-in-periodic-table-groups-t247.htm http://chemistry.forumotion.com/questions-and-answers-f1/bond-angles-t246.htm chris 1. 109.5◦
2. 90◦, 120◦, 180◦
3. 90◦, 120◦
4. less than 109.5◦
5. 120◦
6. 90◦, 180◦
7. 180◦]]> Questions and Answers Mon, 23 Nov 2009 00:45:52 GMT http://chemistry.forumotion.com/questions-and-answers-f1/bond-angles-t246.htm#551 http://chemistry.forumotion.com/questions-and-answers-f1/bond-angles-t246.htm http://chemistry.forumotion.com/questions-and-answers-f1/sigma-and-pi-bonds-t245.htm chris 1. 2 sigma bonds and 1 pi bonds.
2. 4 sigma bonds and no pi bonds.
3. 1 sigma bonds and 3 pi bonds.
4. no sigma bonds and 4 pi bonds.
5. 3 sigma bonds and 1 pi bond.
6. 2 sigma bonds and 2 pi bonds.


i have no idea how to do this]]> Questions and Answers Mon, 23 Nov 2009 00:45:15 GMT http://chemistry.forumotion.com/questions-and-answers-f1/sigma-and-pi-bonds-t245.htm#550 http://chemistry.forumotion.com/questions-and-answers-f1/sigma-and-pi-bonds-t245.htm http://chemistry.forumotion.com/questions-and-answers-f1/when-magnesium-hydroxide-and-hci-are-mixed-together-magnesium-chloride-and-water-are-formed-in-a-particular-reaction-250-g-of-each-reaction-are-used-t244.htm xo6soccerqto6x a.write the balanced chemical equation
b.calculate the number of moles of magnesium hydroxide available.
c.calculate the number of moles of hydrochloric acid available.]]> Questions and Answers Thu, 12 Nov 2009 21:48:59 GMT http://chemistry.forumotion.com/questions-and-answers-f1/when-magnesium-hydroxide-and-hci-are-mixed-together-magnesium-chloride-and-water-are-formed-in-a-particular-reaction-250-g-of-each-reaction-are-used-t244.htm#549 http://chemistry.forumotion.com/questions-and-answers-f1/when-magnesium-hydroxide-and-hci-are-mixed-together-magnesium-chloride-and-water-are-formed-in-a-particular-reaction-250-g-of-each-reaction-are-used-t244.htm http://chemistry.forumotion.com/questions-and-answers-f1/inorganic-chemistry-t243.htm hafizata Is conductivity of group 1A elements increases or decreases down the group? Questions and Answers Wed, 04 Nov 2009 02:03:17 GMT http://chemistry.forumotion.com/questions-and-answers-f1/inorganic-chemistry-t243.htm#548 http://chemistry.forumotion.com/questions-and-answers-f1/inorganic-chemistry-t243.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t234.htm japeitiatia What are the main gases found in the Earth’s atmosphere and what is the percentage composition? Questions and Answers Thu, 29 Oct 2009 01:18:49 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t234.htm#538 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t234.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t242.htm japeitiatia What is the ‘greenhouse effect’ in Earth’s atmosphere and how is it thought to be brought about? Questions and Answers Thu, 29 Oct 2009 01:24:25 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t242.htm#546 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t242.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t241.htm japeitiatia Plants can be grown in a greenhouse. How does a greenhouse work? Questions and Answers Thu, 29 Oct 2009 01:23:53 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t241.htm#545 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t241.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t240.htm japeitiatia What is the Montreal Protocol? Questions and Answers Thu, 29 Oct 2009 01:22:53 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t240.htm#544 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t240.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t239.htm japeitiatia What are CFC’s and how do they affect the atmosphere? Questions and Answers Thu, 29 Oct 2009 01:22:20 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t239.htm#543 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t239.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t238.htm japeitiatia Ozone is both helpful and harmful to living organisms. How is it helpful and how is it harmful? Questions and Answers Thu, 29 Oct 2009 01:20:45 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t238.htm#542 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t238.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t237.htm japeitiatia What is ozone? Questions and Answers Thu, 29 Oct 2009 01:20:18 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t237.htm#541 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t237.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t236.htm japeitiatia Why is carbon dioxide important to living organisms? Questions and Answers Thu, 29 Oct 2009 01:19:53 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t236.htm#540 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t236.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t235.htm japeitiatia Why is oxygen important to living organisms? Questions and Answers Thu, 29 Oct 2009 01:19:20 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t235.htm#539 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t235.htm http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t233.htm japeitiatia What is the difference between a mixture and a compound? Questions and Answers Thu, 29 Oct 2009 01:18:19 GMT http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t233.htm#537 http://chemistry.forumotion.com/questions-and-answers-f1/science-qs-t233.htm http://chemistry.forumotion.com/questions-and-answers-f1/difference-between-mixture-and-a-compound-t231.htm kara-ellen hi, I have Science homework, I would greatly apprecaiate it if you could answer the following questions; 1.what is the difference between a mixture and a compound? 2.what are the main gases found in the Earth's atmosphere and what is the percentage composition? 3.why is oxygen important to living organisms? (obvious? I know) 4.why is carbon dioxide important to living organisms? 5.what us Ozone? 6. Ozone is both helpful and harmful to to living organisms. how is it helpful and ... Questions and Answers Wed, 21 Oct 2009 06:55:19 GMT http://chemistry.forumotion.com/questions-and-answers-f1/difference-between-mixture-and-a-compound-t231.htm#533 http://chemistry.forumotion.com/questions-and-answers-f1/difference-between-mixture-and-a-compound-t231.htm http://chemistry.forumotion.com/questions-and-answers-f1/ion-chromotography-single-point-calibration-t232.htm catrinas
I have an external standard single point calibration problem.

The F- 10ppm standard gave a peak area of 8.85 using ion chromotography. The unknown gave a peak area of 0.68 how do I find the F- concentration?]]> Questions and Answers Thu, 22 Oct 2009 22:36:36 GMT http://chemistry.forumotion.com/questions-and-answers-f1/ion-chromotography-single-point-calibration-t232.htm#535 http://chemistry.forumotion.com/questions-and-answers-f1/ion-chromotography-single-point-calibration-t232.htm http://chemistry.forumotion.com/questions-and-answers-f1/calculating-number-of-moles-t230.htm nafum I need some help with one of the questions on my homework. Lead(II) oxide was allowed to react with 175 cm cubed of 1.50 mol dm -cubed nitric acid. Calculate the number of moles of nitric acid Calculate the number of moles of lead(II) Nitrate Calculate the mass of lead (II) nitrate which could be obtained from this reaction I think I have worked out the first part of the question (0.2625mol) but I dont know how to answer the other two. Also if possible could you tell ... Questions and Answers Tue, 20 Oct 2009 19:14:37 GMT http://chemistry.forumotion.com/questions-and-answers-f1/calculating-number-of-moles-t230.htm#532 http://chemistry.forumotion.com/questions-and-answers-f1/calculating-number-of-moles-t230.htm http://chemistry.forumotion.com/questions-and-answers-f1/periodic-trends-of-ionization-energy-t229.htm mescalito I am looking at a bar graph showing an increase of ionization energy and each element seems to be increasing accordingly. There are a a few exceptions though, Aluminum and Sulfur. They tend to drop the rate of increase and throw off the trend. How could one explain this using the Quantum Theory? Help is appreciated. Thanks!]]> Questions and Answers Tue, 13 Oct 2009 17:32:53 GMT http://chemistry.forumotion.com/questions-and-answers-f1/periodic-trends-of-ionization-energy-t229.htm#531 http://chemistry.forumotion.com/questions-and-answers-f1/periodic-trends-of-ionization-energy-t229.htm http://chemistry.forumotion.com/questions-and-answers-f1/mbbs-in-ukraine-t228.htm ttnnqq03 Hi, Join the world recognized MBBS program in Ukraine. You can now earn your MBBS degree at an expense less than 30% by doing it in one of the most reputed universities in Ukraine with world class accreditation. * 50% Aggregate In Physics, Chemistry & Biology * 30% Cheaper * World Class Standards * Medical University Listed With International Medical Education Directory (IMED). Karabuts Logovenko Street, Mykolayiv Ukraine - 16600 +380930484422 Website: ... Questions and Answers Sat, 03 Oct 2009 04:12:25 GMT http://chemistry.forumotion.com/questions-and-answers-f1/mbbs-in-ukraine-t228.htm#530 http://chemistry.forumotion.com/questions-and-answers-f1/mbbs-in-ukraine-t228.htm http://chemistry.forumotion.com/questions-and-answers-f1/chemistry-in-fitness-need-a-reply-asapthank-you-t227.htm naughty-nataraj_88 I am a student of grade 11 and i require help in finding information on "chemistry in fitness" i know its a very broad topic...but if anybody would be kind enough to help...i would be really gratefull...do forgive me as i am new here i do not know how things go around...so yea..Please in need of urgent help...Thank you.. -Vikram Ganeshan-[/color] Questions and Answers Sat, 03 Oct 2009 03:41:39 GMT http://chemistry.forumotion.com/questions-and-answers-f1/chemistry-in-fitness-need-a-reply-asapthank-you-t227.htm#529 http://chemistry.forumotion.com/questions-and-answers-f1/chemistry-in-fitness-need-a-reply-asapthank-you-t227.htm http://chemistry.forumotion.com/questions-and-answers-f1/a-few-questions-acidity-t226.htm gabe Hello, this is my first post. I have a only a few questions... Thanks for any help... gabe Is Palladium on carbon (Pd/C) the same as Palladium on charcoal? If I am told to hydrogenate a solution containing Pd/C at 10 bar what does that mean? When someone asks you to add 100ml water to 50g of residue (from a previous reaction) and then make acidic with 50% Hydrochloric acid (HCl) are they telling you to bring the solution to a ph of 3.5? Does 3.5 mean the solution is ... Questions and Answers Sat, 03 Oct 2009 02:40:03 GMT http://chemistry.forumotion.com/questions-and-answers-f1/a-few-questions-acidity-t226.htm#528 http://chemistry.forumotion.com/questions-and-answers-f1/a-few-questions-acidity-t226.htm http://chemistry.forumotion.com/questions-and-answers-f1/how-does-the-principal-energy-levels-relate-to-the-electron-configuration-t225.htm DRsky
need help on it~~

can someone answer asap?]]> Questions and Answers Thu, 24 Sep 2009 05:57:55 GMT http://chemistry.forumotion.com/questions-and-answers-f1/how-does-the-principal-energy-levels-relate-to-the-electron-configuration-t225.htm#526 http://chemistry.forumotion.com/questions-and-answers-f1/how-does-the-principal-energy-levels-relate-to-the-electron-configuration-t225.htm http://chemistry.forumotion.com/questions-and-answers-f1/classify-each-of-the-following-as-a-lewis-acid-or-a-lewis-base-t223.htm pplantblues
Co³⁺ SO₃ BCl₃ I^- H₂O




..]]> Questions and Answers Wed, 23 Sep 2009 00:25:10 GMT http://chemistry.forumotion.com/questions-and-answers-f1/classify-each-of-the-following-as-a-lewis-acid-or-a-lewis-base-t223.htm#524 http://chemistry.forumotion.com/questions-and-answers-f1/classify-each-of-the-following-as-a-lewis-acid-or-a-lewis-base-t223.htm http://chemistry.forumotion.com/questions-and-answers-f1/chemical-mania-t221.htm rishi777 Like all engineers, chemical engineers use math, physics, and economics to solve technical problems. The difference between chemical engineers and other types of engineers is that they apply a knowledge of chemistry in addition to other engineering disciplines. Chemical engineers sometimes are called 'universal engineers' because their scientific and technical mastery is so broad. Some chemical engineers make designs and invent new processes. Some construct instruments and facilities. Some ... Questions and Answers Mon, 21 Sep 2009 07:40:40 GMT http://chemistry.forumotion.com/questions-and-answers-f1/chemical-mania-t221.htm#522 http://chemistry.forumotion.com/questions-and-answers-f1/chemical-mania-t221.htm http://chemistry.forumotion.com/questions-and-answers-f1/biotechnology-t216.htm rishi777 Biotechnology is technology based on biology, agriculture, food science, and medicine. Modern use of the term usually refers to genetic engineering as well as cell- and tissue culture technologies. However, the concept encompasses a wider range and history of procedures for modifying living things according to human purposes, going back to domestication of animals, cultivation of plants and "improvements" to these through breeding programs that employ artificial selection and [url=http://en.wikipedia.org/wiki/Hybrid_(biology)]hybridization[/url]. ... Questions and Answers Tue, 15 Sep 2009 08:36:16 GMT http://chemistry.forumotion.com/questions-and-answers-f1/biotechnology-t216.htm#517 http://chemistry.forumotion.com/questions-and-answers-f1/biotechnology-t216.htm http://chemistry.forumotion.com/questions-and-answers-f1/nano-technology-products-t215.htm rishi777 HORIBA Jobin Yvon is one of the world's largest manufacturers of spectroscopic systems and metrology products. We provide complete solutions for nano-materials analysis, characterization and nanotech research. Nano researchers can now exploit the key tools of Raman, Fluorescence and Ellipsometry to probe the composition, chirality, band gap and thickness of the new generation of functional nanomaterials. Whether you're working with single-wall carbon nanotubes (SWCNT), quantum dots, nanoparticles, ... Questions and Answers Tue, 15 Sep 2009 08:32:12 GMT http://chemistry.forumotion.com/questions-and-answers-f1/nano-technology-products-t215.htm#516 http://chemistry.forumotion.com/questions-and-answers-f1/nano-technology-products-t215.htm http://chemistry.forumotion.com/questions-and-answers-f1/electrochemistry-t214.htm rishi777 [b]Electrochemistry is a branch of chemistry that studies chemical reactions which take place in a solution at the interface of an electron conductor (a metal or a semiconductor) and an ionic conductor (the electrolyte), and which involve electron transfer between the electrode and the electrolyte or species in solution. If a chemical reaction is driven by an external applied voltage, as in electrolysis, or if a voltage is created by a chemical reaction as in a [url=http://en.wikipedia.org/wiki/Battery_(electricity)]battery[/url], ... Questions and Answers Tue, 15 Sep 2009 08:28:10 GMT http://chemistry.forumotion.com/questions-and-answers-f1/electrochemistry-t214.htm#515 http://chemistry.forumotion.com/questions-and-answers-f1/electrochemistry-t214.htm http://chemistry.forumotion.com/questions-and-answers-f1/thermodynamics-t213.htm rishi777 The history of thermodynamics as a scientific discipline generally begins with Otto von Guericke who, in 1650, built and designed the world's first vacuum pump and demonstrated a vacuum using his Magdeburg hemispheres. Guericke was driven to make a vacuum in order to disprove Aristotle's long-held supposition that 'nature abhors a vacuum'. Shortly after Guericke, the Irish physicist and chemist Robert Boyle had learned of Guericke's designs and, in 1656, in coordination with English scientist ... Questions and Answers Tue, 15 Sep 2009 08:23:37 GMT http://chemistry.forumotion.com/questions-and-answers-f1/thermodynamics-t213.htm#514 http://chemistry.forumotion.com/questions-and-answers-f1/thermodynamics-t213.htm http://chemistry.forumotion.com/questions-and-answers-f1/chemical-engineering-timeline-t212.htm rishi777 In 1824, French physicist Sadi Carnot, in his “On the Motive Power of Fire”, was the first to study the thermodynamics of combustion reactions in steam engines. In the 1850s, German physicist Rudolf Clausius began to apply the principles developed by Carnot to chemical systems at the atomic to molecular scale. During the years 1873 to 1876 at Yale University, American mathematical physicist Josiah Willard Gibbs, the first to be awarded a Ph.D. in engineering in the U.S., in a series of ... Questions and Answers Tue, 15 Sep 2009 08:19:00 GMT http://chemistry.forumotion.com/questions-and-answers-f1/chemical-engineering-timeline-t212.htm#513 http://chemistry.forumotion.com/questions-and-answers-f1/chemical-engineering-timeline-t212.htm http://chemistry.forumotion.com/questions-and-answers-f1/chemical-engineering-t211.htm rishi777 Cheengineering is the branch of engineering that deals with the application of physical science (e.g. chemistry and physics), and life sciences (e.g. biology, microbiology and biochemistry) with mathematics, to the process of converting raw materials or chemicals into more useful or valuable forms. In addition to producing useful materials, modern chemical engineering is also concerned with pioneering valuable new materials and techniques - such as nanotechnology, fuel cells and biomedical mical ... Questions and Answers Tue, 15 Sep 2009 08:15:10 GMT http://chemistry.forumotion.com/questions-and-answers-f1/chemical-engineering-t211.htm#512 http://chemistry.forumotion.com/questions-and-answers-f1/chemical-engineering-t211.htm http://chemistry.forumotion.com/questions-and-answers-f1/first-night-s-action-t210.htm rishi777 The Americans knew of the approach of the Japanese forces from reports from native scouts and their own patrols, but did not know exactly where or when they would attack. The ridge around which Edson deployed his men consisted of three distinct hillocks. At the southern tip and surrounded on three sides by thick jungle was Hill 80 (so named because it rose 80 feet (24 m) above sea level). Six hundred yards north was Hill 123 (123 ft, 37m, high), the dominant feature on the ridge. The northernmost ... Questions and Answers Mon, 14 Sep 2009 08:57:15 GMT http://chemistry.forumotion.com/questions-and-answers-f1/first-night-s-action-t210.htm#511 http://chemistry.forumotion.com/questions-and-answers-f1/first-night-s-action-t210.htm http://chemistry.forumotion.com/questions-and-answers-f1/discovered-in-the-late-1980s-and-first-approved-for-use-in-2000-linezolid-was-the-first-commercially-available-oxazolidinone-antibiotic-as-of-2009-it-is-the-only-marketed-oxazolidinone-although-others-are-in-development-as-a-protein-synthesis-inhibit-t209.htm rishi777 Linezolid is a synthetic antibiotic used for the treatment of serious infections caused by Gram-positive bacteria that are resistant to several other antibiotics. A member of the oxazolidinone class of drugs, linezolid is active against most Gram-positive bacteria that cause disease, including streptococci, vancomycin-resistant enterococci, and methicillin-resistant Staphylococcus aureus. The main indications of linezolid are infections of the skin and soft tissues and pneumonia (particularly ... Questions and Answers Mon, 14 Sep 2009 08:55:02 GMT http://chemistry.forumotion.com/questions-and-answers-f1/discovered-in-the-late-1980s-and-first-approved-for-use-in-2000-linezolid-was-the-first-commercially-available-oxazolidinone-antibiotic-as-of-2009-it-is-the-only-marketed-oxazolidinone-although-others-are-in-development-as-a-protein-synthesis-inhibit-t209.htm#510 http://chemistry.forumotion.com/questions-and-answers-f1/discovered-in-the-late-1980s-and-first-approved-for-use-in-2000-linezolid-was-the-first-commercially-available-oxazolidinone-antibiotic-as-of-2009-it-is-the-only-marketed-oxazolidinone-although-others-are-in-development-as-a-protein-synthesis-inhibit-t209.htm http://chemistry.forumotion.com/questions-and-answers-f1/ancient-egyptian-technology-t208.htm rishi777 The characteristics of ancient Egyptian technology are indicated by a set of artifacts and customs that lasted for thousands of years. The Egyptians invented and used many basic machines, such as the ramp and the lever, to aid construction processes. They used rope trusses to stiffen the beam of ships, unknown again until modern engineering. Egyptian paper, made from papyrus, and pottery was mass produced and exported throughout the Mediterranean basin. The wheel, however, did not arrive until ... Questions and Answers Mon, 14 Sep 2009 08:50:50 GMT http://chemistry.forumotion.com/questions-and-answers-f1/ancient-egyptian-technology-t208.htm#509 http://chemistry.forumotion.com/questions-and-answers-f1/ancient-egyptian-technology-t208.htm http://chemistry.forumotion.com/questions-and-answers-f1/predynastic-period-t207.htm rishi777 In Predynastic and Early Dynastic times, the Egyptian climate was much less arid than it is today. Large regions of Egypt were covered in treed savanna and traversed by herds of grazing ungulates. Foliage and fauna were far more prolific in all environs and the Nile region supported large populations of waterfowl. Hunting would have been common for Egyptians and this is also the period during which many animals would have been first domesticated.[11]By about 5500 BC, small tribes living in the ... Questions and Answers Mon, 14 Sep 2009 08:47:50 GMT http://chemistry.forumotion.com/questions-and-answers-f1/predynastic-period-t207.htm#508 http://chemistry.forumotion.com/questions-and-answers-f1/predynastic-period-t207.htm http://chemistry.forumotion.com/questions-and-answers-f1/ancient-egypt-t206.htm rishi777 Ancient Egypt was an ancient civilization of eastern North Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt. The civilization coalesced around 3150 BC[1] with the political unification of Upper and Lower Egypt under the first pharaoh, and it developed over the next three millennia.[2] Its history occurred in a series of comparatively stable periods, labeled by scholars today as Kingdoms, separated by periods of relative instability known ... Questions and Answers Mon, 14 Sep 2009 08:45:32 GMT http://chemistry.forumotion.com/questions-and-answers-f1/ancient-egypt-t206.htm#507 http://chemistry.forumotion.com/questions-and-answers-f1/ancient-egypt-t206.htm http://chemistry.forumotion.com/questions-and-answers-f1/chemical-reaction-t205.htm rishi777 Chemical reaction is a concept related to the transformation of a chemical substance through its interaction with another, or as a result of its interaction with some form of energy. A chemical reaction may occur naturally or carried out in a laboratory by chemists in specially designed vessels which are often laboratory glassware. It can result in the formation or dissociation of molecules, that is, molecules breaking apart to form two or more smaller molecules, or rearrangement of atoms within ... Questions and Answers Mon, 14 Sep 2009 08:43:25 GMT http://chemistry.forumotion.com/questions-and-answers-f1/chemical-reaction-t205.htm#506 http://chemistry.forumotion.com/questions-and-answers-f1/chemical-reaction-t205.htm http://chemistry.forumotion.com/questions-and-answers-f1/greek-atomism-t204.htm rishi777 Greek atomism dates back to 440 BC, as what might be indicated by the book De Rerum Natura (The Nature of Things)[12] written by the Roman Lucretius[13] in 50 BC. Much of the early development of purification methods is described by Pliny the Elder in his Naturalis Historia. Some consider medieval Arabs and Persians to be the earliest chemists, who introduced precise observation and controlled experimentation into the field, and discovered numerous chemical substances.[14] The most influential ... Questions and Answers Mon, 14 Sep 2009 08:38:45 GMT http://chemistry.forumotion.com/questions-and-answers-f1/greek-atomism-t204.htm#505 http://chemistry.forumotion.com/questions-and-answers-f1/greek-atomism-t204.htm http://chemistry.forumotion.com/questions-and-answers-f1/chemistry-mania-t203.htm rishi777 Chemistry (from Egyptian kēme (chem), meaning "earth"[1]) is the science concerned with the composition, behavior, structure, and properties of matter, as well as the changes it undergoes during chemical reactions.[2] It is a physical science for studies of various atoms, molecules, crystals and other aggregates of matter whether in isolation or combination, which incorporates the concepts of energy and entropy in relation to the spontaneity of chemical processes. Modern chemistry ... Questions and Answers Mon, 14 Sep 2009 08:34:26 GMT http://chemistry.forumotion.com/questions-and-answers-f1/chemistry-mania-t203.htm#504 http://chemistry.forumotion.com/questions-and-answers-f1/chemistry-mania-t203.htm http://chemistry.forumotion.com/questions-and-answers-f1/lavoisier-antoine-laurent-t202.htm rishi777 PREVIEW | (1743 -- 1794 ), French scientist and public servant: the hero of the chemical revolution and a victim of the French Revolution. Lavoisier was brought up in Paris during the most productive years of the philosophes’ movement. He received his secondary education at the collège des Quatre Nations—known as collège Mazarin because it was founded by Cardinal Mazarin. Although he was particularly fond of the mathematics lessons given by Lacaille, a famous astronomer, Lavoisier chose ... Questions and Answers Mon, 14 Sep 2009 08:31:36 GMT http://chemistry.forumotion.com/questions-and-answers-f1/lavoisier-antoine-laurent-t202.htm#503 http://chemistry.forumotion.com/questions-and-answers-f1/lavoisier-antoine-laurent-t202.htm http://chemistry.forumotion.com/questions-and-answers-f1/organic-reactions-t201.htm rishi777 Organic Reactions is a comprehensive collection of important synthetic reactions, together with a critical discussion of the reaction and tables that organize all published examples of the topic reactions. Chapters that focus on reactions of current interest are solicited by the board of editors from leading chemists worldwide. The publication process entails a comprehensive peer-review process, ensuring the high quality and attention to detail for which this series is noted. Organic Reactions ... Questions and Answers Mon, 14 Sep 2009 08:21:24 GMT http://chemistry.forumotion.com/questions-and-answers-f1/organic-reactions-t201.htm#502 http://chemistry.forumotion.com/questions-and-answers-f1/organic-reactions-t201.htm http://chemistry.forumotion.com/questions-and-answers-f1/so2-lewis-structures-t197.htm pplantblues 2 in which all atoms obey the octet rule. Show formal charges.


Draw a lewis structure for SO₂ in which all atoms have a formal charge of zero.]]> Questions and Answers Sun, 06 Sep 2009 18:55:48 GMT http://chemistry.forumotion.com/questions-and-answers-f1/so2-lewis-structures-t197.htm#495 http://chemistry.forumotion.com/questions-and-answers-f1/so2-lewis-structures-t197.htm http://chemistry.forumotion.com/questions-and-answers-f1/quantum-chemistry-t200.htm VickyDama IN what way it made life easier to study the chemical species?
Please answer]]> Questions and Answers Wed, 09 Sep 2009 17:09:47 GMT http://chemistry.forumotion.com/questions-and-answers-f1/quantum-chemistry-t200.htm#498 http://chemistry.forumotion.com/questions-and-answers-f1/quantum-chemistry-t200.htm http://chemistry.forumotion.com/questions-and-answers-f1/negative-charge-and-bond-order-t199.htm pplantblues Consider the resonance structures for the carbonate ion. O--C-O- ___l ___O- -O-C--O ___l ___O- -O-C-O- ___l ___l ___O a. How much negative charge is on each oxygen of the carbonate ion? 0, -.33, -.50, -.67, -1.00, -1.33, -1.50, -1.67, -2.00 b. What is the bond order of each carbon oxygen bond in the carbonate ion? 0, .33, .50, .67, 1.00, 1.33, 1.50, 1.67, 2.00, 4.00 Questions and Answers Tue, 08 Sep 2009 00:00:23 GMT http://chemistry.forumotion.com/questions-and-answers-f1/negative-charge-and-bond-order-t199.htm#497 http://chemistry.forumotion.com/questions-and-answers-f1/negative-charge-and-bond-order-t199.htm http://chemistry.forumotion.com/questions-and-answers-f1/identify-the-longest-shortest-and-weakest-bonds-t198.htm pplantblues
A. H₃C-C---C-H

B. (H₃C-H)>--<(H-CH₃)

C. (H-H₃C)>--<(CH₃-H)

D. H₃C-CH₂-(CH-CH₃)-CH₃]]> Questions and Answers Mon, 07 Sep 2009 22:56:58 GMT http://chemistry.forumotion.com/questions-and-answers-f1/identify-the-longest-shortest-and-weakest-bonds-t198.htm#496 http://chemistry.forumotion.com/questions-and-answers-f1/identify-the-longest-shortest-and-weakest-bonds-t198.htm http://chemistry.forumotion.com/questions-and-answers-f1/finding-ph-t196.htm syikin_rahim a monoprotic acid HA(Ka= 7.60*10^ -4) is 4.00% ionized when 80 gram of its dissolve in 1 L.What is the formula weight of the acid? Questions and Answers Sat, 05 Sep 2009 06:44:22 GMT http://chemistry.forumotion.com/questions-and-answers-f1/finding-ph-t196.htm#494 http://chemistry.forumotion.com/questions-and-answers-f1/finding-ph-t196.htm http://chemistry.forumotion.com/questions-and-answers-f1/online-chemistry-tutor-t195.htm uma Get a head start in chemistry I am online chemistry tutor who can help you in learning and practicing organic chemistry , general and physical chemistry . http://chemtopper.com/,http://chemtopper.com/smf/index.php Questions and Answers Mon, 31 Aug 2009 07:44:41 GMT http://chemistry.forumotion.com/questions-and-answers-f1/online-chemistry-tutor-t195.htm#493 http://chemistry.forumotion.com/questions-and-answers-f1/online-chemistry-tutor-t195.htm http://chemistry.forumotion.com/questions-and-answers-f1/energy-and-sub-energy-levels-t182.htm czyrr008
enumerate the different sub-energy level and give the corresponding maximum number of electron that can hold.]]> Questions and Answers Sun, 26 Jul 2009 03:51:45 GMT http://chemistry.forumotion.com/questions-and-answers-f1/energy-and-sub-energy-levels-t182.htm#474 http://chemistry.forumotion.com/questions-and-answers-f1/energy-and-sub-energy-levels-t182.htm http://chemistry.forumotion.com/questions-and-answers-f1/why-does-aluminum-and-hydrochloric-acid-react-t194.htm michaelclarence87
Why does Zinc and Hyrochloric Acid React?

Why does Magnesium and Hydrochloric Acid React?]]> Questions and Answers Fri, 28 Aug 2009 03:58:10 GMT http://chemistry.forumotion.com/questions-and-answers-f1/why-does-aluminum-and-hydrochloric-acid-react-t194.htm#490 http://chemistry.forumotion.com/questions-and-answers-f1/why-does-aluminum-and-hydrochloric-acid-react-t194.htm http://chemistry.forumotion.com/questions-and-answers-f1/discussion-of-ketone-aldehyde-t187.htm vikasm ketone aldehyde resins with wide compatibility, process for their preparation, and their use. The invention relates to ketone-aldehyde resins with wide compatibility comprising cycloaliphatic ketones and, in particular, formaldehyde and, if desired, further monomers, to a process for their preparation and to their use as hard resin in paints, printing inks and other coatings, especially in pigment preparations.]]> Questions and Answers Tue, 04 Aug 2009 10:24:16 GMT http://chemistry.forumotion.com/questions-and-answers-f1/discussion-of-ketone-aldehyde-t187.htm#483 http://chemistry.forumotion.com/questions-and-answers-f1/discussion-of-ketone-aldehyde-t187.htm