Latest Invention: Tea Bag that Uses Nanotechnology to Clean Drinking Water One of the latest inventions developed by researchers from Stellenbosch University in South Africa is a one of a kind "tea bag" that makes use of nanotechnology to clean drinking water‚ making it free from contaminants and bacteria. It would be interesting to note that the "tea bag" is made of the same material that is used to make the actual tea bags. The only difference is that in the Stellenbosch researchers’ invention
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HYDROGEN BONDING: Hydrogen bonding is a bonding type consisting of dipole and dispersion forces. A hydrogen bond is the attractive force between a hydrogen atom attached to a molecule and an atom of a different molecule. According to the Pauling scale of electro-negativities of the elements‚ it can be viewed that the three most electronegative elements in the periodical table are nitrogen‚ oxygen and fluorine. These are also called heteroatoms. The heteroatoms have a partial negative charge while
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more chemical species combining to form a new product. While Synthesis can only form only one product‚ Decomposition can only start with one reactant. A good example of a Synthesis Reaction is the combination of iron and sulfur to create Iron (II) Sulfide while a good example of Decomposition is the electrolysis (or the passage of an electrical current
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|Chemistry Review 1 |TEACHER ANSWER KEY | | |June 06‚ 2011 | | | |’see explanation below’
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Hydrogen Fuel Cells There are many reasons to look for new cleaner forms of energy. Fossil fuels‚ being non-renewable‚ will eventually run out. Pollution from burning fossil fuels destroys our environment. Hydrogen fuel cells could be used many places where fossil fuels are currently being used. Using hydrogen as a form of energy can not only reduce our dependence on imported oil‚ but also benefit the environment by reducing emissions of greenhouse gases and pollutants that affect our air quality
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Chemistry •Matter • • • States Properties Classification Chemistry is the study of the composition‚ properties and structure of matter. it is considered “the central science”; blending at one extreme into physics‚ mathematics‚ engineering and sometimes into earth and life Chemistry Is the study of the matter‚ its classification‚ composition‚ properties and structure; the changes it undergoes‚ the energy transformation that goes with the change‚ and the laws and principles governing such changes
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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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Describe the preparation and reactions of alkenes. 7. Propose mechanism on preparation; dehydration of alcohol 8. Define carbocation‚ electrophile and Markovnikov’s Rule. 9. Propose mechanism on reaction addition of cold sulphuric acid and Hydrogen halide Alkanes Nomenclature of Alkanes Sources & Importance of Alkanes A. Natural Gas Consists of 90-95% methane with lesser amounts of ethane and other low-molecular-weight hydrocarbons. B. Petroleum Liquid mixture of
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very readily making it essential in matches‚ gunpowder‚ and fireworks. This element is crucial to life itself is found in animals‚ vegetables‚ and protein. As I was saying earlier sulfur has a unique smell that is compared to rotten eggs due to hydrogen sulfide. Since sulfur is such an abundant element it ranks 16th in the most important elements in the earth crust. Sulfur is a native element that is found commonly in salt domes in the gulf region of the U.S states not only is the element found their
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OXIDATION AND REDUCTION Oxygen makes up only about 20% of the air‚ yet is the essential component for so many reactions. Without it fuels would not burn‚ iron would not rust and we would be unable to obtain energy from our food molecules through respiration. Indeed animal life on the planet did not evolve until a certain concentration of oxygen had built up in the atmosphere over 600 million years ago. The term oxidation has been in use for a long time to describe these and other reactions where
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