Holiday Gifts for Good -Silicon Valley Parents Develop GigatonGifts Website 1888 Press Release - GigatonGifts was launched in December by a group of Silicon Valley parents concerned about deforestation. Volunteer parents developed the GigatonGifts website (www.GigatonGifts.org)‚ where people can purchase trees and solar stoves in Africa and Haiti as gifts. San Francisco‚ CA - GigatonGifts was launched in December of 2013 by a group of Silicon Valley parents concerned about the planet
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of one hundred eighteen elements that either occur naturally or as laboratory productions. Of these‚ six of them are crucial to the vitality and sustainment of life. These include carbon‚ hydrogen‚ nitrogen‚ oxygen‚ phosphorus‚ and sulfur. For a molecule to be considered organic‚ it must contain rings or chains of carbon (Volesky). A molecule is a chemical species encompassing several or many nonmetal atoms. The atoms bond covalently. In other words‚ the electrons in the valence‚ or outermost‚ shells
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HISTORY OF CUTTING TOOL MATERIALS • Cutting tool used during the industrial revolution in 1800 A.D • First cutting tool was cast using crucible method (1740) and slight hardened by H.T. • 1868: R. Mushet found by adding Tungsten we can increase hardness and tool life ( Air Quenching) • F.W.Taylor in Pennsylvania did the most basic research in metal cutting between 1880-1905 • Invented high speed steel (better H.T. process) • Better alloy
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Are Aromatic Hydrocarbons Carcinogenic Aromatic hydrocarbons or arenes are hydrocarbons characterized by alternating double and single bonds between carbons. Benzene is the most common aromatic hydrocarbon‚ but there are some non-benzene based compounds called heteroarenes‚ where a carbon is replaced by an oxygen‚ nitrogen‚ or sulfur‚ that are also aromatic compounds. Aromatic hydrocarbons exist in our daily lives regardless if we recognize them or not. Aromatic hydrocarbons are ingested or
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special case of conjugation that leads to an especially stable bonding arrangement. The benzene ring consists of six sp2 hybridized carbon atoms in a regular hexagon. Each carbon forms two σ-bonds with adjacent carbons‚ and a third σ-bond with a hydrogen atom. The 2p orbital on each atom is available for π-bonding. Interaction between the p orbitals on the six carbon atoms forms a conjugated system of π-electrons. Molecules with this bonding arrangement are called aromatic molecules. For convenience
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air pollution was the burning of fossil fuels by the many manufacturing industries producing iron and steel‚ automobiles‚ machinery‚ textiles and food. Coal and Oil were the main sources of fuel for the factories which resulted in the release of carbon dioxide‚ sulphur dioxide‚ smoke‚ soot and other particulates. Inefficient machinery and obsolete techniques coupled with the improper monitoring worsened the air pollution. the severe air pollution was causing acid rain‚ smog and health problems.
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reaction‚ a bond is formed between two molecules and creates water as a byproduct. Aldol condensation is a C-C bond forming reaction between the alpha Carbon of the aldehyde or ketone and carbonyl carbon of another ketone or aldehyde. Aldol condensation is different from aldol condensation reaction. For aldol addition reaction‚ the alpha carbon of one aldehyde or ketone adds to the carbonyl group of the other ketone or aldehyde. This process creates a beta-hydroxy carbonyl‚ which is called aldol
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reactions in organic chemistry and was first investigated by Otto Diels and Kurt Alder in Germany. It is a [4+2] concerted cycloaddition reaction which involves a diene and a dienophile. The Diel-Alder reaction are mainly used for creating new carbon-carbon bonds‚ mostly involved in forming rings which is does easily. The rings that are formed are stereospecific which is a key characteristic in these reactions. The Diels-Alder reaction is considered a pericyclic reaction which means the electron
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Unit 1 Key Questions Lesson 1 1. One argument against continuing research on the atom is that the cost continues to increase at an alarming rate‚ and the benefits seem to be declining. Whereas quantum chemistry experiments as early as 80 years ago were very cheap and yielded considerable practical results‚ now very few if any practical results are emerging‚ but the costs of experiments continues to increase. On the other hand
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Variables: Independent variable: the mass of the beans Dependent variable: the different types of beans Control: The beans Purpose: The purpose of the lab is to find equal measurement of each type of bean. After you find the mass of each bean you need to find the relative mass of each bean. The navy bean will have the smallest relative mass. You will need to wear safety goggles and a lab apron and wash hands after the lab is finished. If you drop any beans pick them up immediately to prevent
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