STK 1084 Inorganic Chemistry I‚ LU 3 Oxidation – Reduction Reactions‚ Prepared By: Dr. Tay Meng Guan‚ Faculty of Resource Science and Technology‚ Universiti Malaysia Sarawak. LU 3 Oxidation and Reduction Reactions 3.1 Ideas of Oxidation and Reduction Oxidation of an atom can be occurred in the following conditions: 1. Losing an electron from the orbitals. e.g.: A A+ + e- 2. Adding an electronegative element (e.g.: F‚ Cl‚ Br‚ O) to a molecule. e.g.: A + F AF 3. Losing hydrogen
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Copper(II) sulft pentahydrate CuSo4.5H2o AR Sinopharm Chemical Reagent Co.Ltd Sodium hydroxide NaOH AR Sinopharm Chemical Reagent Co.Ltd Potassium Sodium Tartrate Tertrahy drat C4H4O6KN4 .4H2O AR Sinopharm Chemical Reagent Co.Ltd Silver Nitrate AgNO3 AR Sinopharm Chemical Reagent Co.Ltd Trisodium Citrate dihydrate C6H5Na3O7.2H2O AR Sinopharm Chemical Reagent Co.Ltd Hydrogen Peroxide H2O2 AR Sinopharm Chemical Reagent Co.Ltd Sodium borohydride NaBH4 AR Sinopharm Chemical Reagent
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health‚ but it is a cumulative poison‚ and can cause serious harm if inhaled as a powder‚ or ingested over a long period. Most lead salts are very poisonous‚ as are many organic compounds containing lead‚ such as lead tetraethyl. Silver nitrate‚ AgNO3 Stability-Stable. Substances to be avoided include nonmetals‚ organic substances‚ alkali hydroxides‚ acetylidene‚ acetylene‚ aldehydes‚ nitriles‚ ammonia‚ alcohols‚ ammonium compounds‚ combustible materials‚ hydrazine and its derivatives‚ carbides
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Student Number Mark / 100 2011 TRIAL HSC EXAMINATION Chemistry General Instructions • • • • • • • Reading time – 5 minutes Working time – 3 hours 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 and those of pages 10 and 11. Total Marks – 100 Section I Pages 2 – 24 Confidential Keep Secure 75 marks This section has two parts‚ Part
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05_Chem_GRSW_Ch09.SE/TE 6/11/04 3:33 PM Page 79 Name ___________________________ 9 Date ___________________ Class __________________ 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
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CONCENTRATION AND DILUTION Physiology 1‚ Las Positas College Name: In science‚ concentration is a measure of the number of particles (solutes) in a given volume. If one room has 100 people in it‚ and a room of equal size has 50 people‚ one can say that the concentration of people in one room is twice that of the other. Quite simple‚ isn’t it? On a molecular level‚ consider whether you put one lump or two of sugar‚ or no sugar at all‚ in your coffee. If you use two lumps‚ you prefer twice
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1 PRACTICE EXAM (not all questions pertain to a specific mid-term). This is taken from an earlier final exam. 1. (4 pts) Permanganate ion oxidizes sulfide ion to elemental sulfur (which you should represent as a single S atom) and is reduced to MnO2 in basic solution. In the balanced equation for this reaction‚ which you should determine in the work area‚ how many water molecules and hydroxide ions are needed in the final balanced equation? Work area: # of H2O ____4______ # of OH-
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Accept 1 mark for 2nd and 3rd marking points if the correct reactivity order of chlorine > bromine > iodine has been stated. 3 (ii) Br2 + 2I– 2Br– + I2 (1) 1 [4] 3. add AgNO3/Ag+ (to a solution of the food) (1) Ag+(aq) + Cl–(aq) AgCl(s) (1) degree of cloudiness/whiteness/intensity indicates relative quantity (1) sodium ion content needs to be determined as well (1) [4]
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THE CHEMICAL EARTH: 1. The living and nonliving components of the Earth contain mixtures ● Construct word and balanced formulae equations of chemical reactions as they are encountered Reactants → products Chemical reaction: the way atoms are joined changes‚ atoms are not created nor destroyed‚ but are rearranged Indicators: emission of light or heat‚ odour formation of a gas formation of a precipitate colour change change in state aqueous = dissolved in water‚ an aqueous solution
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SULIT 1 4541/1 Peraturan Permarkahan CHEMISTRY 4541 Kertas 1 Ogos 2011 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011 CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 1 4541 /1 © Trial2011 Hak Cipta Sekolah Berasrama Penuh http://cikguadura.wordpress.com SULIT SULIT 2 SKEMA KERTAS 1 CHEMISTRY 4541/1 4541/1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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