PHEROMONES 1. INTRODUCTION What are pheromones? Pheromones‚ as defined by John W. Kimball‚ are chemicals released by an organism into its environment enabling it to communicate with other members of its own species. The term Pheromones (originates from two Greek words‚ pherein meaning transfer and hormone meaning to excite or stimulate)‚ as proposed by Karlson and Luscher(1959) was used to describe a chemical secreted by an animal to release a specific reaction that triggers members of
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Andy Chen and Alexander Van Buren 9/15/11 AP Chemistry Dr. Isotone Lab 1: Determination of the Empirical Formula of Silver Oxide Lab Objective: In this experiment‚ the percent composition and empirical formula of silver oxide will be determined. Silver oxide will be heated until it decomposes to silver metal and oxygen‚ and the percent calculation and empirical formula can be calculated based on combining the ratios of silver and oxygen in the reaction. Summary of
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THE EFFECTS OF DIFFERENT FORMULATED ORGANIC PESTICIDES TO THE PREVENTION OF OCCURANCE OF PESTS Reaman S. Balois Paulene Andrea D. Pontela THESIS REPORT Republic of the Philippines ISABELA STATE UNIVERSITY Roxas‚ Isabela THE EFFECTS OF DIFFERENT FORMULATED ORGANIC PESTICIDES TO THE PREVENTION OF OCCURANCE OF PESTS Thesis outline presented to the faculty and staff of Isabela State University‚ Roxas‚ Isabela in partial fulfilment of the requirements
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Preparation of 4-bromoaniline Introduction Aromatic compounds tend to undergo electrophilic aromatic substitutions rather than addition reactions. Substitution of a new group for a hydrogen atom takes place via a resonance-stabilized carbocation. As the benzene ring is quite electron-rich‚ it almost always behaves as a nucleophile in a reaction which means the substitution on benzene occurs by the addition of an electrophile. Substituted benzenes tend to react at predictable positions. Alkyl groups
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Hydrate Chemistry 11 3/5/2013 Purpose: To determine the percent by mass of water in a hydrate of copper (II) sulfate hydrate. Hypothesis: I hypothesize that when the solution is heated the hydrate will convert to an anhydrous ionic compound. Then the percentage composition will be determined by weighing the mass of the white crystals. Materials: 400ml beaker‚ hot plate‚ tongs‚ scoopula‚ electronic balance‚ glass rod‚ hot pad‚ and 4g of hydrated copper (II) sulfate Procedure:
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Aim: to perform a firsthand investigation to compare the physical and chemical properties of magnesium and oxygen when they are experimented to form magnesium oxide Theory: The empirical formula of a compound is the formula that tells us the ratio in which the atoms are present in the compound. To calculate an empirical formula: - Write down the masses of all of the elements present - Convert masses to moles (by dividing by atomic weights in grams) - Divide through by the smallest number of
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(70 points) Title | How the Volume of the Slurry Mix Effected the Biogas Generator | Type of Experiment | Experimental | Background Information | Methane is a chemical compound with the chemical formula CH4. It is the simplest alkane‚ the main component of natural gas‚ and probably the most abundant organic compound on earth. For this experiment we had created a bio gas generator. A biogas generator is any gas fuel derived from the decay of organic matter‚ as the mixture of methane and carbon
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Water and me Water is a colourless‚ transparent and odourless liquid which forms the seas‚ lakes‚ rivers‚ and rain and is the basis of the fluids of living organisms. It is a chemical compound whose formula is H2O. It covers 71% of the earth’s surface and is necessary for every known organism to live. 97% of the total water found on the earth lies in the oceans. The rest of water is in the form of glaciers and ice caps (2.1%)‚ ground water (0.6%)‚ inland water (0.2%) and water vapours (0.001%).
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Scientists have been continuously presented with questions regarding the mystery that is life. What is life‚ and how did it get started? Their responses to these questions has varied over the years as advances in technology have led to new evidence being brought in from a ranging variety of fields. In the summer of 1993‚ J. William Schopf‚ a paleobiologist reportedly found fossilized imprints of microbial communities between layers of rock that were 3.5 billion years old. This‚ along with other
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electrophilic reaction is when the pi bond of a molecule is removed to make two covalent bonds that are bonded to two new molecules. A nucleophillic addition is a reaction that removed the pi bond from a molecule and adds covalent bonds with two new compounds. Halogenation or most commonly known as bromination is a reaction that breaks a pi bond and adds a halogen or in this case‚ a bromine to the molecule. This addition of the bromine can be very steroselective. Stereoselectivity can come from
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