Oxidation Number When elements combine to produce a compound‚ each element is assigned an “apparent” charge. This apparent charge‚ the charge an atom would have if both electrons in each bond were assigned to the more electronegative element‚ may be positive or negative. It is called the oxidation number or state of the element in the compound. Oxidation numbers are very useful in keeping track of what happens to electrons when various elements combine to form compounds. By remembering a few
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Lab 5 Oxidation of an alcohol CHM2123 Introduction: Oxidation is a key reaction in organic chemistry. Oxidation of an alcohol can produce aldehydes‚ ketones‚ or carboxylic acids. One of the methods of oxidation is an aldol reaction through carbon-carbon bonds. The oxidation oxidizes primary alcohols to aldehydes and secondary alcohols oxidizes ketones. Tertiary alcohols are converted to the common oxidizing agents. Scheme 5.1: Aldehydes can be oxidized easily to carboxylic acids in aqueous medias
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Analysis of subject: The painting is actually depicting the sea and the sky. The sea is black‚ and the sky is gray. The artist uses fishing hooks and nails to create the sea‚ while he paints the sky with oil. 2. Analysis of Form: This painting is an abstract and representational artwork. This painting also has a mechanical art style. The artist uses black fishing hooks to create a symmetrical balance. The achromatic color scheme of the painting conveys a nostalgic and longing mood. The artist achieves
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Andy Warhol opened up his studio “The Factory” in 1962 as a place for him to create art and mass produce it‚ the name symbolises what the studio will be used for “A factory is where you build things This is where I make or build my work. In my art work‚ hand painting would take much too long and anyway that’s not the age we live in. Mechanical means are today‚ and using them I can get more art to more people” (Warhol‚ mid-1960’s‚ 5‚ Warhol‚ Michaelson‚ Buchloh). Soon “The Factory” became a hang-out
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used to establish tonal values in fresco painting quickly‚ creating a soft greenish-gray for the shadows of flesh tones. Architectural details in frescoes were often left in the pure Verdaccio coloring‚ hence we are able to still see evidence of it today in works such as Michelangelo’s Sistine Chapel. What does Verdaccio have to do with modern oil painting? As any artist can tell you‚ achieving realistic flesh tones is one of the hardest aspects of painting in color. But even early tempera painters
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Chinese Culture Club Xiang Bao Activity- May 30‚ 2014 Hello everyone‚ and thank you for coming today. I start this meeting at ____. Motion. Second. II. Explain activity a. today we are going to be making scented sachets‚ or Xiang Bao in cele bration of the Dragon Boat festival which is on June 2nd. Also‚ for those of you who are I. here for the extra credit‚ you must stay for the entire activity and show Mrs.Hung your finished product before you leave b. So that you are all familiar
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certain factors such as the consistency and drying period. Determining which medium is better‚ oils or acrylics‚ is completely up to the painter‚ both have their uses but definitely have their differences. The consistency of paint can allow for a painting to convey a certain feeling. One of the major differences in consistency is the base of the paint‚ oil paints are oil based and acrylic paint is water based. The water based acrylics can be thinned out by adding more water‚ making the paint become
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Oxidation of an Alcohol: Oxidizing Methoxybenzyl Alcohol to Methoxybenzaldehyde Using Phase-Transfer Catalysis PURPOSE OF THE EXPERIMENT Oxidize methoxybenzyl alcohol to methoxybenzaldehyde‚ using sodium hypochlorite as the oxidizing agent and tetrabutylammonium hydrogen sulfate as the phase-transfer catalyst. Monitor the progress of the reaction by thin-layer chromatography. BACKGROUND REQUIRED You should be familiar with extraction‚ evaporation‚ and thin-layer chromatography techniques
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PAINTING Painting – is among the fine arts‚ which creates meaningful effects‚ depicting different intrinsic human values‚ by the use of clustered imagination of lines and color. Painting is placed on a flat surfaced by the use of pigments. Painting expresses the artist’s perceptions and feelings on a particular selected subject. Usually‚ the artist’s selection of a subject comes from the understanding and interpretation of his feelings and emotions. Some artist may love country scenes‚ like landscape
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behind Catholicism and tell stories of Christ’s life and passion. Paintings was exclusively for the churches and for religious purposes. Occassionally used for propaganda. Tagalog painters Jose Loden‚ Tomas Nazario and Miguel delos Reyes‚ did the first still life paintings in the country. They were commissioned in 1786 by a Spanish botanist to paint the flora and fauna in the country. The earliest known historical paintings in the Philippines was a mural at the Palacio Real in Intramuros entitle
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