As Chemistry Summary of how the atoms have changed throughout the years? One of the first founders of the idea of atoms was called Democritus‚ which was in 430 BC. He argued that there were an infinite number of different types of atoms. They were all different shape however they were made from the same stuff. He describes atoms as indivisible particles and also explained certain natural occurrences such as the existence of elements. Atomos (in ancient Greek) means “that which cannot be further
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Physics 102 Atoms to Galaxies (Lecture Sec. 5 / Lab Sec. 6) Spring 2011 Lecturer: Dr. Shang-Fen Ren Moulton Hall 312 C (309) 438-5246 Email: phy102ren@yahoo.com Lectures: 9:35 am – 10: 50 pm‚ Tuesday and Thursday Class Website: http://www.phy.ilstu.edu/~ren/phy102ren Textbook Companion Site: www.wiley.com/college/trefil. Hands on Activities: Open labs‚ Moulton 202 & 204 (tentative schedule) Monday closed Tuesday - Friday: 10:00 am to 4:00 pm Office Hours: 10:50am
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1. Hydrogen Name: Hydrogen Atomic number: 1 Atomic Weight: 1.00794 grams/mole Standard state: gas at 198 K Hydrogen is the lightest Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up above 90% of Universe by weight. Hydrogen as water (H2O) is absolutely essential to life and it is present in all organic compounds. Hydrogen is lightest gas. Hydrogen gas was used in lighter-than-air balloons for transport but is far too dangerous because
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Practical Report Experiment 1 Abstract In this experiment we found that you can calculate the density of elements with close presotion with crude experiments Introduction The aim of this experiment was to see how close you could measure the density of atoms with crude experiments. The second part of the experiment dealt with Solubility of large ions and their Hydration enthalpy. Hydration enthalpy is the enthalpy change when 1 mole of an ionic substance dissolves in a solution to give a solution
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1- Look up the following elements and show their (atomic number‚ atomic mass‚ the symbol‚ number of electrons‚ protons and neutrons) the elements are Iron‚ copper‚ sodium‚ magnesium‚ chlorine‚ fluorine‚ carbon‚ hydrogen‚ oxygen. Element |Symbol |Atomic # |Mass # |#Protons |#Electrons |#Neutrons | |Iron |Fe |26 |26+26=52 |26 |26 |26 | |Copper |Cu |29 |29+29=58 |29 |29 |29 | |Sodium |Na |11 |11+11=22 |11 |11 |11 | |Magnesium |Mg |12 |12+12=24 |12 |12 |12 | |Chlorine |Ci |17 |17+17=34 |17 |17 |17
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4s2 3d10 4p6 5s2 4d2 b) Zr4+ exists because Zirconium structure contains 40 electrons. For Zirconium to become chemical stable it must lose 4 electrons (to become a noble gas). So that is why Zr4+ is formed. Compare the stability of the zr atom and zr ion. the electron configuration for Zr is [Kr] 4d2 5s2. Ions are formed by losing electrons in outer shells to obtain more stable electron configurations like those of noble gases. By losing 4 electrons‚ it would have the electron configuration
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the lab. It should include the name of the element (or unknown) examined and the color of the observed flame Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did. The first unknown element sodium knew it was because she got yellow and each element corresponded a unique color. The second element potassium knew it was because I acquired a blue color‚ in the experiment verified that each element corresponded to a different color. Part
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Fiction 20 September 2014 Gothic Elements in Jaws In June of 1995‚ Director Steven Spielberg released a terrifying thriller called Jaws. In this film a gigantic great white shark terrorizes a small island‚ which is solely dependent on its beach for revenue. This movie was so scary because it is much more likely happen‚ unlike a zombie apocalypse or alien attack. People were so afraid of shark attacks they stayed far away from the beaches. Spielberg used gothic elements in his movie Jaws. The way he
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Biologically Important Molecules Carbohydrates‚ Proteins Lipids And Nucleic Acids Professor Anthony Depass Biology 1 9/25/14 Introduction: By completing lab exercise 6 : Biologically Important Molecules‚ we are able to perform tests such as the Benedicts Test for Reducing Sugars‚ Iodine Test‚ Biuret Test‚ Sudan IV Test‚ and lastly the Grease-Spot Test that detect the presence of biologically important carbohydrates‚ protein lipids and nucleic acids. Most known compounds in living organism
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The Molecules of Cells (Chapter 3 in your textbook) Without water and carbon-based molecules‚ no life as we know it! Carbon: The Backbone of Life • Living organisms consist mostly of carbon-based compounds Also‚ H‚ N‚ O‚ P‚ and S…… • Carbon is unparalleled in its ability to form large‚ complex‚ and diverse molecules. Why? Principal source of carbon on Earth? • Proteins‚ DNA‚ carbohydrates‚ lipids‚ and other molecules that distinguish living matter are all composed of carbon. C21H36N7O16P3S Coenzyme
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