four metals (magnesium - chromium) are considered active metals and they will react with very hot water or steam to form the oxide and hydrogen gas. * The oxides of all of these first metals resist reduction by H2. * The next six metals (iron - lead) replace hydrogen from HCl and dil. sulfuric and nitric acids. Their oxides undergo reduction by heating with H2‚ carbon‚ and carbon monoxide. * The metals lithium - copper‚ can combine directly with oxygen to form the oxide. * The last
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Nomenclature for Ionic Compounds Ionic compounds consist of cations (positive ions) and anions (negative ions). The nomenclature‚ or naming‚ of ionic compounds is based on the names of the component ions. Here are the principal naming conventions for ionic compounds‚ along with examples to show how they are used: Roman NumeralsA Roman numeral in parentheses‚ followed by the name of the element‚ is used for elements that can form more than one positive ion. This is usually seen with metals. You
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pure state. It occurs as an oxide in the minerals ilmenite‚ rutile and sphene. To obtain titanium oxide‚ the mineral is ground and mixed with potassium carbonate and aqueous hydrofluoric acid to yield potassium fluorotitanate. The fluorotitanate is extracted with hot water and decomposed with ammonia. The resulting ammoniacal hydrated oxide‚ when ignited in a platinum vessel‚ yields titanium dioxide‚ TiO2. Titanium is obtained in the pure form by first treating the oxide with chlorine to form titanium
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_____________________________CORRTECH CATHODIC PROTECTION FOR PORT FACILITIES _____________________________CORRTECH Contents • • • • • • What causes corrosion What is CP and how does it work? Galvanic vs. impressed current Electrolytes (or where can I use CP) Marine applications Condition assessments _____________________________CORRTECH What is Corrosion? Corrosion is defined as the degradation of a material due to a reaction with it’s environment. Metals require energy to process
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THE MOLE CONCEPT References : Mohammed and Lambert ( Old Edition) Chapter 11 pg. 107 Mohammed and Lambert ( New edition) Chapter 8 pg 123 Anne Tindale Chapter 10 pg 46 The following topics will be covered : 1. Definition of Relative Atomic and Relative Molecular Masses. 2. Calculation of Relative Molecular Masses 3. Converting Moles to Grams / Grams to Moles 4. Calculation from equations Masses of substances /Volumes of gases / Concentration
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Why are the called alkaline earth metals The alkaline earth metals are named after their oxides‚ the alkaline earths‚ whose oldfashioned names were beryllia‚ magnesia‚ lime‚ strontia‚ and baryta. These oxides are basic (alkaline) when combined with water. "Earth" is an old term applied by early chemists to nonmetallic substances that are insoluble in water and resistant to heating—properties shared by these oxides. Physical Properties of Alkaline Earth metals 1. They normally conduct electricity well
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pieces of paper. Put two pieces of magnesium ribbon on the paper labeled “Magnesium”. 2. Examine each substance with a magnifying glass. Record observations in Data Table 1. 3. Test the effect of a magnet on each substance by passing the magnet under the paper. 4. Test the solubility of each substance by mixing small amounts in a separate test tube with 3mL of distilled water in it‚ then “flick” each tube to mix the contents. 5. Return strip of magnesium in test tube to its paper. Follow
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GENERAL CHEMISTRY Laboratory Guide This module provides a laboratory guidelines‚ safety declaration form‚ Lab Report guidelines and Laboratory manual for subject of General Chemistry (CLD 10004). Mohd Zulkhairi Abdul Rahim Laboratory Information Before each lab session‚ you should prepare by reading the lab manual and the textbook required reading. We expect you to have a good understanding of the purpose‚ details of the procedure‚ the use of all chemicals and any significant hazards
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number of platters a drive can have is limited by the drive’s vertical physical size. The maximum number of platters I have seen in any 3 1/2-inch drive is 12; however‚ most drives have six or fewer. Platters were originally made from an aluminum/magnesium alloy‚ which provides both strength and light weight. However‚ manufacturers’ desire for higher and higher densities and smaller drives has led to the use of platters made of glass (or‚ more technically‚ a glass-ceramic composite). One such material
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rusting Steel bubbles No reaction No reaction rusting No reaction rusting No reaction Table 2: Observations Results: HCl(Solution used) Metal Word Equation Balanced Equation Cu NR NR Mg Magnesium + Hydrochloric Acid ---> Hydrogen + Magnesium Chloride Mg(s) + 2HCl(aq) ---> H2(g) + MgCl2(s) Sn NR NR Zn NR NR Fe NR NR Steel (FeAl) Iron (III) + Hydrochloric Acid ---> Hydrogen + Iron (III) Chloride 2Fe(s) + 6HCl(aq) ---> 3H2(g) + 2FeCl3(s)
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