embarrassing skin disease that affects primarily teenagers and young adults. Three out of 4 teenagers will be diagnosed with acne.1 Acne is very easily diagnosed and can also easily be treated. Although Isotretinoin works well on severe acne‚ Benzoyl peroxide gel works extremely well for most acne and has very few side effects. Acne: What is it? In your skin you have millions of pores that open up to a follicle. In each follicle there is a hair gland and an oil gland. The oil gland produces oil to help
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1. Describe the nuclear fusion reaction that occurs in stars. Page 294 Stars are made primarily of the almond hydrogen the most common material universe. As a star forms‚ gravity pulls the hydrogen into a dense ball that heats up. Electrons are torn from the hydrogen and other atoms‚ creating a plasma made up primarily of protons (the nucleus of the hydrogen atom) and electrons. Normally‚ protons would repel each other. As matter accumulates ending the new star however‚ the protons move
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started doing chemistry. Bubbles of hydrogen are formed‚ together with colourless solutions of beryllium or magnesium sulphate. For example: Calcium‚ strontium and barium Calcium sulphate is sparingly soluble‚ and you can think of strontium and barium sulphates as being insoluble. That means that you will get a layer of insoluble sulphate on all of these which will slow down the reaction or stop it entirely. In the calcium case‚ you will get some hydrogen produced together with a white
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crystals of buckminsterfullerene (C60) • Carbon nanotubes Bond polarity and intermolecular forces • Electronegativity and bond polarity • Van der Waals’ forces • Factors affecting the strength of van der Waals’ forces • Hydrogen bonding • Surface tension and viscosity of liquids Topic 6 Microscopic World II Unit 23 Shapes of molecules Unit 23 23.1 23.2 23.3 23.4 23.5 23.6 23.7 Shapes of molecules Covalent molecules with non-octet
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and you tend to get carbon and hydrogen fluoride produced. It is of no particular interest. For example: The reaction between alkanes and iodine Iodine doesn’t react with the alkanes to any extent - at least‚ under normal lab conditions. The reactions between alkanes and chlorine or bromine There is no reaction in the dark. In the presence of a flame‚ the reactions are rather like the fluorine one - producing a mixture of carbon and the hydrogen halide. The violence of the reaction
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SPM CHEMISTRY REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Panel : 1. 2. 3. 4. June Ling S J Chen Soo Chien Felix Ngui Jong Kah Yin SMK St Joseph‚ Kuching Kolej DPAH Abdilah‚ Kuching SMK Tabuan Jaya‚ Kuching SM Sains Kuching REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Page Compiled and edited by : Jong Kah Yin 1 SPM CHEMISTRY INDEX CONTENT 1 REVISION CHECK-LIST Form 4 Form 5 2 WRITING EQUATIONS 2.1 Charges of ions 2.2 Formulae of compounds
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prepared by treating lithium hydride (LiH) with aluminum chloride (AlCl3) (Scheme 1). 4LiH + AlCl3 Scheme 1 LiAlH4 + 3LiCl In industrial scale‚ it is prepared from sodium aluminum hydride which is prepared by reaction of sodium‚ aluminum and hydrogen at high temperature and pressure (Scheme 2). Na + Al + 2H2 NaAlH4 LiAlH4 Scheme 2 NaAlH4 + LiCl + NaCl Joint initiative of IITs and IISc – Funded by MHRD Page 1 of 55 NPTEL – Chemistry – Reagents and Organic reactions 2.1.1.3
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measuring the total hydrogen yield of the reaction. Stoichiometry was then used to find a molar ratio between hydrogen and zinc. After calculating the moles of zinc‚ the mass can then be figured by multiplying by the molar mass of zinc. Experimental Procedure. First an apparatus needed to be set up to measure the hydrogen gas given off in the reaction of the zinc on the nail and the hydrochloric acid. A Erlenmeyer flask was used to hold the acid and nail which released the hydrogen into a rubber
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Water is a chemical compound with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at standard ambient temperature and pressure‚ but it often co-exists on Earth with its solid state‚ ice‚ and gaseous state (water vapor or steam). Water also exists in a liquid crystal state near hydrophilic surfaces. Water is considered a purifier in most religions. Major faiths that incorporate ritual washing (ablution) include Christianity
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from 5 to 20 nm. A fluidised bed reactor was developed for a large-scale synthesis of the carbon nanotubermetal oxide composite ŽCMC. material. Hydrogen storage capacities of these materials were tested by volumetric and electrochemical methods. q 2002 Elsevier Science B.V. All rights reserved. Keywords: Carbon nanotubes; Functional materials; Hydrogen storage; Electron microscopy 1. Introduction Carbon nanotubes have interesting physical properties such as high mechanical stability‚ large
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