__________________ CHEMICAL NAMES AND FORMULAS SECTION 9.1 NAMING IONS (pages 253–258) This section explains the use of the periodic table to determine the charge of an ion. It also defines polyatomic ion and gives the names and formulas for the most common polyatomic ions. Monatomic Ions (pages 253–256) 1. What are monatomic ions? Monatomic ions are ions consisting of only one atom. 2. How is the ionic charge of a Group 1A‚ 2A‚ or 3A ion determined? The ionic charge is numerically equal to the group
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Antimony Pale green Se Selenium Azure blue Sr Strontium Crimson Te Tellurium Pale green Tl Thallium Pure green Zn Zinc Bluish green to whitish green Sources of error for the flame test: The test cannot detect low concentrations of most ions. The brightness of the signal varies from one sample to another. For example‚ the yellow emission from sodium is much brighter than the red emission from the same amount
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Student Number Mark / 39 Chemistry Preliminary Course Final Examination • 2006 General Instructions • • • • • • • Reading time – 5 minutes Working time – 45 minutes Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A Data Sheet and a Periodic Table are provided Write your Student Number at the top of this page Total Marks – 39 Part A – 10 marks • Attempt Questions 1 – 10 • Allow about 10 minutes for this part Part B – 29 marks • Attempt
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procedures‚ there are limitations that exist‚ but were not addressed due to insufficient time and limited resources to carry out the experiment. Firstly‚ varying the length of boiling might not be the best method to determine the amount of calcium ions. If time permits‚ I could perhaps investigate other variables such as pH‚ surface area and concentration and their effect on calcium leaching. Moreover‚ I could also use other types of fish soup stocks and compare to determine which soup has more calcium
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molecules. ii) Molecular nitrogen is not particularly reactive. iii) NCl3 gets readily hydrolyzed while NF3 does not. iv) Nitrogen does not form pent halides like phosphorous. v) Bond angle of ammonia is higher than phosphine. vi) Ammonia is a good complexing agent. vii) Though nitrogen exhibits +5 oxidation state‚ it does not form pentahalide. Give reason. viii) PH3 has lower boiling point than ammonia. ix) H3PO3 is diprotic. x) Unlike phosphorous‚ nitrogen
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Chemistry in Everyday Life The question paper will include value based question(s) to the extent of 3-5 marks. 162 DESIGN OF QUESTION PAPER CHEMISTRY (043) CLASS-XII – (2012-13) One Paper Unit No. Unit I Unit II Unit III Unit IV Unit V Unit VI Unit VII Unit VIII Unit IX Unit X Unit XI Unit XII Unit XIII Unit XIV Unit XV Unit XVI Title Solid State Solutions Electrochemistry Chemical Kinetics Surface Chemistry General Principles and Processes of Isolation of Elements p -Block Elements d -and
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a balanced oxidation/reduction reaction between iodine‚ hydrogen‚ and bromate ion occurs. The above reaction occurs slowly so we used a coupled iodine clock reaction to measure the rate of the oxidation/reduction reaction because it occurs much faster but is still dependent upon the other reaction. To accomplish this‚ two mixtures were prepared in separate Erlenmeyer flasks. In the 250 ml flask .010M potassium iodide‚ .0010M Sodium thiosulfate and distilled water was prepared. A 125 ml flask was
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Two main classifications of single-replacement reactions are cation replacement reactions and anion replacement reactions. Cations are positively charged ions‚ which consists of all metals‚ while anions are negatively charged. Amrita University explains that in a cation replacement reaction‚ “One cation replaces another” and in an anion replacement reaction‚ “one anion replaces another from its solution
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the dead bodies. I am going to explain what Ions are including Cations and Anions because it is the background information needed to carry out this investigation. An ion is an atom or molecule which the total number of electrons isn’t equal to the total number of protons giving the atom a positive or negative electrical charge. When an atom is attracted to another atom because it has an unequal number of electrons and protons‚ the atom is called an Ion. If the atom has more electrons than protons
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CChemistry Exam #2 Study Guide (10/07/12) I. Bonding a. Ionic Bonding i. Electrons are transferred ii. Ions are held together by electrostatic force b. Covalent Bonding iii. Electrons are somehow shared iv. Electrons are attracted to nuclei (shared) II. Electronegativity c. The ability of an atom in a molecule to attract shared electrons to itself d. Measured on Pauling Scale e. Most electronegative: Fluorine.
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