HKCEE Chemistry 2007 Paper 1 Section A 1. A is a compound formed from oxygen and magnesium‚ while B is a compound formed from oxygen and fluorine. a) Draw the electronic diagram of A‚ showing electrons in he outermost shells only. (1) b) Draw the electronic diagram of B‚ showing electrons in the outermost shells only. (1) c) Compare the melting points of A and B. Explains your answer. Melting point of A is higher than that of B. Ions of A are linked by strong ionic bonds /
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® Copying is permitted according to the Site Licence Conditions only keep it simple science Preliminary Chemistry Topic 2 METALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction
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Chemistry Equipment Symbols 1. Test Tube 2. Boiling Tube 3. Beaker 4. Conical Flask 5. Test Tube Holder/ Tongs /Clamp Stand 6. Measuring/Graduating 7. Funnel 8. Pipette Cylinder 9. Spatula 10. Tripod 11. Bunsen Burner 12. Glass Bulb 13. Burette 16. Condenser Pipette Changes of State Filtering Solutions 03-Nov
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WESTFIELD Science-Oriented School and Colleges CERTIFICATION OF THE PROJECT This is to certify that we have read the individual project entitled MAKING ELECTRICITY FROM SALTWATER AND AIR The researcher has successfully completed and defended his Science Project before a panel Recommendation: [ ] Approved [ ] Passed with revision [ ] Redefense Sir Jonathan Paulino Sir Joebert Angeles Member of
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What is a brass instrument? Before getting into the history of how brass instruments originated and developed it is necessary to be clear on what a brass instrument actually is. A brass instrument is defined as an “aerophone‚” which means it is an instrument where the musician must blow air into the instrument. The musician produces the tone by buzzing the lips into what is generally a cup-shaped mouthpiece. It doesn’t mean that the instrument is necessarily made of brass‚ since instruments that
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Materials • 6 test tubes and rack • Test tube holder • Bunsen burner • Hydrochloric acid 0.1M • Copper sulphate solution 0.5M • Bunsen burner Method Diagrams of the set up for experiments: 1‚ 2 and 3 Experiment 1 1. Pour about 1cm of hydrochloric acid into each test tube 2. Drop a piece of zinc into each of the first two test tubes. Reduce the concentration of the hydrochloric acid in the second test tube by adding water
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Classifying Reactions Safety Reminder: Wear safety glasses and conduct experiment in a well-ventilated area. Day 1 Materials: Part I: steel wool (HEB‚ Target‚ Lowe’s‚ Home Depot) You can also try SOS pads. tweezers vinegar test tube (in your kit) water petri dish (in your kit) Part II: hydrogen peroxide small pieces of raw potato (yeast or beef liver may be substituted for the potato) small bowl Procedures: Part I: Reaction between iron and oxygen 1. Break off a small piece of steel wool
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four metals from most reactive to least reactive is: zinc‚ iron‚ nickel‚ copper. Zinc is the most reactive. The reaction occurred quickly… small bubbles (hydrogen) appeared straight away. As the reaction continued‚ larger bubbles (more hydrogen) appeared. At the end of the experiment‚ the nail was completely rusted. Hydrogen displaced the zinc. Iron had no visible reaction after 1 hour‚ so there wasn’t as an immediate of a reaction as with the zinc. The reaction then escalated after four hours‚ and
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pollutants of concern include lead‚ chromium‚ mercury‚ uranium‚ selenium‚ zinc‚ arsenic‚ cadmium‚ gold‚ silver‚ copper and nickel. These toxic materials may be derived from mining operations‚ refining ores‚ sludge disposal‚ fly ash from incinerators‚ the processing of radioactive materials‚ metal plating‚ or the manufacture of electrical equipment‚ paints‚ alloys‚ batteries‚ pesticides or preservatives. Heavy metals such as zinc‚ lead and chromium have a number of applications in basic engineering
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China circa 3000BC Casting 2.810 Prof. Timothy Gutowski Casting since about 4000 BC… Ancient Greece; bronze statue casting circa 450BC Iron works in early Europe‚ e.g. cast iron cannons from England circa 1543 Outline • Sand Casting‚ Investment Casting‚ Die Casting • Basics and countermeasures • Phase Change‚ Shrinkage • Heat Transfer • Pattern Design • Variations & Developments • Environmental Issues Casting Readings; 1. Kalpakjian‚ Chapters 10‚ 11‚ 12 2. Booothroyd‚ “Design for Die
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