found this new element when he observed that mercuric oxide‚ on heating. Yielded a gas that caused a flame to burn faster. He later found that it could support respiration and therefore he named it dephlogisticated air. It wasn’t until a French chemist Antoine Laurent Lavoisier found it to be an elemental gas. It received it’s current name in s1787 when several French Chemist’s including Lavoiser found that it formed acids from certain oxides of sulfur. The name oxygen literally means (acid former)
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ending with -ide -Greek prefixes are used CO-carbon monoxide CO2-carbon dioxide NO-nitrogen oxide PCl5-phosphorous pentachloride N2O5-dinitrogen pentoxide METAL AND NON-METAL METALS WITH FIXED OXDATION NUMBER-Give the name of the positive ion followed by the negative ion ending with –ide Al+3 O-2 =Al2O3 =aluminum oxide Mg+2 H- =MgH2 =magnesium hydride METALS WITH VARIABLE OXDATION NUMBER -ROMAN NUMERAL METHOD -give the name of the positive atom
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materials. Among the major sources of air pollution are power and heat generation‚ the burning of solid wastes‚ industrial processes‚ and‚ especially‚ transportation. The six major types of air pollutants are carbon monoxide‚ hydrocarbons‚ nitrogen oxides‚ particulates‚ sulfur dioxide‚ and photochemical oxidants. One of the air polution is acid rain. Acid rain is some of the sulfur dioxide gases released as waste products from factories‚ cars‚ and power plants mix with water vapor in the atmosphere
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dioxide. Schematic drawing‚ causes and effects of air pollution: (1) greenhouse effect‚ (2) particulate contamination‚ (3) increased UV radiation‚ (4) acid rain‚ (5) increased ground level ozone concentration‚ (6) increased levels of nitrogen oxides. An air pollutant is a substance in the air that can have adverse effects on humans and the ecosystem. The substance can be solid particles‚ liquid droplets‚ or gases. A pollutant can be of natural origin or man-made. Pollutants are classified as
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Tetrapyrrole compounds: chlorophyll and heme groups By Erwin Lim 1. Tetrapyrrole compounds A tetrapyrrole compound is a chemical group that consists of four pyrroles that are joined together by covalent bonds‚ forming a porphyrin ring. They are naturally occurring pigments‚ which are used in many biological processes (Berg‚ 2009). The basic structure of a tetrapyrrole is as seen in Figure 1‚ while the basic structure of a pyrrole is as seen in Figure 2. Figure 1.Tetrapyrrole Compound (Berg
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of greenhouse gases. Greenhouse gases Carbon dioxide‚ nitrous oxide‚ methane‚ and chlorofluorocarbons gases that absorb and hold heat from the sun‚ preventing it from escaping back into space‚ much like a greenhouse absorbs and holds the sun’s heat. Ozone depletion The gradual breakdown of ozone gas in the stratosphere above us caused by the release of chlorofluorocarbons (CFCs) into the air. Acid rain Occurs when sulfur oxides and
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TREATMENT OF CORROSION Regardless of the type of corrosion or the metal involved‚ corrosion treatment requires three basic steps: 1. Remove as much of the corrosion as possible. 2. Neutralize any residual material. 3. Restore the protective surface film. CORROSION REMOVAL As previously discussed‚ the first step in corrosion control must be cleaning the surface. After the surface is completely clean and it is determined that corrosion does exist‚ the damage must be carefully assessed
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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
Free Periodic table Atom Chemical element
environment or built environment. One of the causes is the exhaust gases emitted by vehicles. These gases are particulate matter (PM)‚ hydrocarbons (HCs)‚ nitrogen oxides (NOx)‚ carbon monoxide (CO)‚ sulfur dioxide (SO2)‚ hazardous air pollutants and greenhouse gases. Some of these gases like carbon monoxide‚ hydrocarbons and nitrogen oxides can be adsorbed by coconut fibers. Coconut fibers have a lot of pores that could actually trap the exhausted or emitted gases of vehicles. Activated carbon is also
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RCA Critical Cleaning Process This paper was especially prepared by Werner Kern‚ the inventor of the RCA clean. Introduction The manufacturing of a silicon integrated circuit (IC) requires 500-600 process steps‚ depending on the specific type of device. Most steps are performed as unit processes with the complete wafers before dicing them into individual chips. Approximately 30% of the steps are cleaning operations‚ which indicate the importance of cleaning and surface conditioning. The device
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