Anthony Martinez Mr. Hruby Chemistry R Period 4(5A) Name & Symbol: Platinum (Pt) Properties: -Atomic Number: 78 -Atomic Mass: 195.084 amu -Appearance: Shiny‚ smooth surface‚ silver like‚ solid. Melting point (K): 2045 Boiling point (K): 4100 Valence electrons: (+1)‚ +2‚ (+3)‚ +4‚ +6 Atomic radius (pm): 139 1st Ionization energy (kJ/mol): 868.1 Electronegativity: 2.28 Natural Occurring Isotopes: Six stable isotopes of platinum occur in nature (190‚ 192‚ 194
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Chemistry of Sunscreens “Over 400 years ago‚ Copernicus declared that the sun was the center of our universe. Primitive societies in every continent have worshiped the sun as the god that provided warmth and made the crops grow” Today‚ the sun is not something we worship but something we try to avoid due to the fact that we are aware that it contains two main sources of ultraviolet radiation that is harmful to our bodies. Ultraviolet radiation (UVR) is defined by wavelengths‚ and is divided
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Kayla Adkins Forensic Chemistry Exam 2 I have been honest and observed no dishonesty. 1. In specific detail‚ describe a published procedure for the definitive identification of Heroin utilizing gas chromatography-mass spectroscopy (GCMS). Heroin is a white crystalline powder with no odor and a bitter taste. It is a derivative of morphine in that the –OH (hydroxyl group) is replaced by an acetyl group‚ -OCOCH3 and has a molecular formula is C21H23NO5 with a molecular weight of 369.42
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Cleaning with soap and soapless detergents. Detergent comes from the Latin word detergere meaning to clean‚ it is defined as a cleansing agent. Therefore‚ water itself is a detergent. This essay looks at soap and soapless (or synthetic) detergents. Both substances we use everyday and have a big market commercially‚ they effect everyone. Soaps are made from natural products and soapless detergents are produced chemically‚ each having advantages and disadvantages. Soap
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Chemistry puns With a wild imagination and a flair for puns‚ you will be able to use the names of many of the elements to take the place of other words or phrases. Some are very straightforward‚ but many of homonyms require a stretch of the imagination. Be creative and have pun! 1. Police officer. 2. Lone Ranger’s horse. 3. If they are not here‚ they ___________. 4. To press a blouse. 5. Motto for an oil well?drilling company. 6. What should you do with dead people’s bodies? 7. A fixture in
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Dark Slime It only takes one more ingredient to turn normal slime into glowing slime. This is a great Halloween project‚ though it’s fun for any time of the year. Glowing slime is safe for kids to make. Difficulty: Easy Time Required: about 15 minutes Here’s How: 1. Basically‚ you make glowing slime by adding zinc sulfide or glowing paint to normal slime. I have a lot ofslime recipes listed. As written‚ these instructions make a clear slime that glows in the dark. However
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2. Tear a piece of paper (about 5 cm x 10 cm) into small pieces. Set a watch glass on an insulating square and place the pieces of paper on the glass. Ignite the paper with a match and allow to burn. 3. Add a microspatula of NaCl (sodium chloride) to a small quantity of water (about 5mL) in a test tube. Shake the contents of the tube. Next‚ use a dropper to add 10 drops of 0.1 silver nitrate to the NaCl-water mixture. 4. Obtain a piece of magnesium ribbon about 5 cm long. Tear the ribbon
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Chemistry in Everyday Life Chemistry in Everyday Life Chemistry is a big part of your everyday life. You find chemistry in daily life in the foods you eat‚ the air you breathe‚ your soap‚ your emotions and literally every object you can see or touch. Here’s a look at some everyday chemistry. Elements in the Human Body Your body is made up of chemical compounds‚ which are combinations of elements. While you probably know your body is mostly water‚ which is hydrogen and oxygen. Most of the human
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SYLLABUS Cambridge O Level Chemistry 5070 For examination in June and November 2014 University of Cambridge International Examinations retains the copyright on all its publications. Registered Centres are permitted to copy material from this booklet for their own internal use. However‚ we cannot give permission to Centres to photocopy any material that is acknowledged to a third party even for internal use within a Centre. © University of Cambridge International Examinations 2011 Contents
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References: 1. Dr. G. Maguire‚ 2009‚ Inorganic Chemistry (Chem. 210) Practical Manual‚ UKZN Durban. 2. Werner‚ A. “Über strukturisomere Salze der Rhodanwasserstoffsäure und der salpetrigen Säure” Berichte der deutschen chemischen Gesellschaft 1907‚ volume 40‚ 765-788. DOI: 10.1002/cber.190704001117
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