Chemistry‚ 2014 UNIT 1 – MATTER TRENDS AND CHEMICAL BONDING History of the atom DEMOCRITUS Smallest particle of matter is called an atom Atoms are in constant motion and have empty space between them ARISTOTLE 4 element theory of matter (earth‚ air‚ water‚ fire) Had different combinations of the 4 qualities: hot‚ cold‚ dry‚ moist JOHN DALTON Expanded on Democritus’s theory: All matter is composed of tiny‚ indivisible particles All atoms of an element have identical properties
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which was then placed in a culture dish filled with distilled water. After waiting 60 minutes‚ for the solutions to escape the bag‚ the distilled water was tested for all five solutions through individual tests of iodine‚ Benedict’s Reagent‚ NaOh and CuSo4‚ and silver nitrate. Whichever tests responded positively was which solution left the dialysis bag. It was predicted that if the substance was polar‚ then it would secrete through the bag‚ and if it was non-polar‚ it would remain inside the dialysis
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Final Exam Review Chapter 2 Study Questions 1. Define the following a) element b) compound c) pure substance 2. Classify each of the following as a pure substance or a mixture. For each pure substance‚ indicate whether it is an element or a compound. Which of the mixtures are solutions a) air b) titanium c) oak d) baking soda e) oxygen f) 7-Up g) wine h) carbon monoxide 3. Label each of the following drawings as element‚ compound‚ or mixture (Assume each type of circle
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Accred Qual Assur (2005) 10:172–176 DOI 10.1007/s00769-005-0914-6 PRACTITIONER’S REPORT V. Kmecl J. SuÐin ˇˇ L. Zupancic-Kralj Validation of analytical methods used for determination of nitrate in soil Received: 7 April 2004 Accepted: 3 November 2004 Published online: 24 March 2005 Springer-Verlag 2005 V. Kmecl ()) · J. SuÐin Agricultural Institute of Slovenia‚ Hacquetova 17‚ 1000 Ljubljana‚ Slovenia e-mail: veronika.kmecl@kis.si Tel.: +386-1-2805164 Fax: +386-1-2805255 ˇˇ L. Zupancic-Kralj
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Chemical Change Lab Name Data Table 1: |Chemicals |Well # |Reaction on White Paper |Reaction on Dark Paper | |NaHCO3 + HCl |A6 |Remains clear. |Remains clear. | |HCl + Blue Dye |B6 |Orange color. |Cannot distinguish color
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Title:Identification of Amino Acids and Proteins Introduction : Amino acids are molecules containing an amine group(NH3)‚ a carboxylic acid group(R-C=O-OH) and a side-chain( usually denoted as R) that varies between different amino acids. The key elements of an amino acid are carbon‚ hydrogen‚ oxygen‚ and nitrogen. Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form in a biologically functional way. A polypeptide is a single
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III Naminosuke Kubota Propellants and Explosives Thermochemical Aspects of Combustion Second‚ Completely Revised and Extended Edition IV The Author Prof. Dr. Naminosuke Kubota Asahi Kasei Chemicals Propellant Combustion Laboratory Arca East‚ Kinshi 3-2-1‚ Sumidaku Tokyo 130-6591‚ Japan All books published by Wiley-VCH are carefully produced. Nevertheless‚ authors‚ editors‚ and publisher do not warrant the information contained in these books‚ including this book‚ to be
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drop of HCl: teal color Kl & Pb (NO3)2 Turns a milky‚ yellow color NaOH & phenolphthalein Turns a pink color HCl & phenolphthalein Remains clear‚ no bubble formed NaOH & AgNO3 Turns a greenish/brownish color AgNO3 & NH3 Remains clear NH3 & CuSo4 Turns a light blue color Questions: A. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). How would you test this material for the presence of sodium bicarbonate? One way you can test for sodium
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Marcela Rodriguez Ricardo Sarabia January 16‚ 2013 Mariana Mendoza Alvaro Puccini Maria Quin Solubility Lab Purpose: The main purpose of doing this lab is to learn how to interpret solubility graphs and how the temperature does affects the solubility of different substances. There are other objectives of the lab which are learning what are concentrated‚ diluted‚ supersaturated‚ and saturated substances and how can they be identified. The hypothesis
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Hugh Kim Lab Report: Stoichiometry Lab 1. Prelab Part1. 1) Create no waste = The principle that encourages chemists to not create waste at the first place rather than cleaning it up afterwards effectively shifts the chemistry more environmentally conscious‚ as creating no waste would make the experiment efficient; the reactants will be reduced to only the essential ones and the product will be maximized‚ a change that would make the experiment economic. Also‚ if chemists aim to
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