The Periodic Table An element is a substance that cannot be made simpler by chemical means Johann Dobereiner divided the elements into groups of three known as triads The three elements had similar chemical properties in which the atomic weight of the middle element was the average of the other two John Newlands classified the elements into groups of eight known as octaves The eight elements were ordered by increasing atomic weight The first and eighth element had similar properties
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Physical & Chemical Properties Data Table 1: Solubility or Reaction Substance Name Color Odor Effect of Heat Cold Water Hot Water Litmus test Dilute HCl Dilute NaOH Mg Silver None None None None Base Fizzes‚ gas‚ increased temperature None Cu Brown None None None None Base None None Zn Silver None None None None Base Fizzes None MgO White Slight odor None None Bubbles Base Dissolves‚ turns yellow‚ increased temperature None CuCO3 Green None Melts
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Observations of Chemical Changes Purpose: The purpose of this experiment is to predict and examine chemical changes/reactions among common chemicals found in consumer products at a macroscopic level. Procedure: The procedure of this experiment was to carefully mix different chemicals together using the chemical filled pipettes and the 96-well plate and determining what chemical reactions occurred. Data Table: Observations of Chemical Changes Experiment 1: Observations of Chemical Reactions |
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cited as the inventor of the modern periodic table‚ his table was just the first to gain scientific credibility‚ and not the first table that organized the elements according to periodic properties. There are 90 elements on the periodic table that occur in nature. All of the other elements are strictly man-made. Technetium was the first element to be made artificially. The International Union of Pure Applied Chemistry‚ IUPAC‚ revises the periodic table as new data becomes available. At the time
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study of microbes‚ which affect almost every aspect of life on the earth. Describe how the table of elements is ordered and discuss four common elements in living organisms. The current periodic table lists 109 elements. It is arranged according to the periodic law; elements are arranged in order of increasing atomic number‚ their physical and chemical properties show a periodic pattern. Elements that have similar properties are arranged in groups or families in vertical columns‚ the horizontal
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Kidneybeanium: 553.33 mg x 0.2143 = 118.58 - Relative Weight of Pintobeanium: 471.67 mg x 0.4286 = 202.16 - Relative Weight of Blackeyedpeaium: 222.00 mg x 0.3571 = 79.28 Part II Record your answer on the answer grid below. (3 point each) Chemical Name Chemical Formula Common Use 1 Sodium hydroxide NaOH Drain cleaner 2 Sodium hydrogen carbonate NaHCO3 Baking soda 3 Aluminum Oxide Al2O3 Sandblasting sand 4 Sodium hypochlorite NaClO Bleach 5 Aluminum sulfate AI2(SO4)3 Used in antiperspirant 6 Ammonium
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in vacuum or free space. Atomic radii may be derived from the distances between two nuclei when the two atoms are joined in a chemical bond. The radius varies with the location of an atom on the atomic chart‚ the type of chemical bond‚ the number of neighbouring atoms (coordination number) and a quantum mechanical property known as spin. On the periodic table of the elements‚ atom size tends to increase when moving down columns‚ but decrease when moving across rows (left to right). When subjected
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A Ring For Gardeners My ring contains no pure elements but its base is made up of a mixture of Gold and Copper forming this popular alloy. It is not a flashy ring as it contains no gemstones or artificial substitutes. It is simply a small pot made of rose gold filled with soil and the grass naturally grown on it. To maintain the care of this ring in comes with a Polycarbonate pane to go over the top of this ring acting as a eco dome‚ this will stop damage coming to the grass. It has
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SILVER By: Wahida Gh-Sakhi What is Silver? Silver is a chemical element with the chemical symbol Ag and atomic number 47. A soft‚ white‚ lustrous transition metal‚ it possesses the highest electrical conductivity of any element and the highest thermal conductivity of any metal. Element Symbol • Ag • Silver‚ Symbol Element Name • Silver Atomic Mass • The atomic mass is 107.8682 Atomic Number • The atomic number is 47 Bohr-Rutherford Diagram The Story of its Discovery Unknown since prehistoric
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Chemical Reactions Lab Objectives: 1. To examine a variety of reactions including precipitation‚ acid-base‚ gas forming‚ and oxidation-reduction reactions. 2. To identify the products formed in these reactions and summarize the chemical changes in terms of balanced chemical equations and net ionic equations. 3. To identify the species being oxidized and reduced in oxidation-reduction reactions and determine which species is the oxidizing agent and the reducing agent. Chemical equations represent
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