English Keanu Johnson Period 8 September 18‚ 2012 Teenage Birth Rate Rises Do you know where your tax dollars are being spent? Every year the government is spending tens of millions tax dollars on programs that hurt our children‚ mainly abortions. Abortions rates have risen over the years because teen sex rates have also climbed and the condom use rates has plummeted. Therefore‚ the most important issue facing our nation’s young people today is the use of abortion as a means of contraception
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Diels-Alder cycloaddition reaction was discovered by Otto Diels and Kurt Alder and is very useful in the synthesis of polycyclic compounds. The Diels-Alder reaction can be described as: [4+2] cycloaddition- a diene with 4 π electrons + 2π electrons from the dienophile; a pericyclic concerted reaction- meaning the reaction occurs in a single step (no intermediates) and involves a cyclic redistribution of bonding electrons. In order for a Diels-Alder reaction to take place the diene must
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Biology Coursework Skill: A - Bunsen Burner - Measuring Liquid Skill: B - Leaf Variation - Conch Skill: C - Heart Rate - Height Variation Skill: D -Energy in food -Toxic response of invertebrates (woodlice) Skill A Title: Assembling & using the Bunsen Burner Aim: To assemble & use the Bunsen Burner Apparatus: * Bunsen Burner * Spark Lighter * Tripod Stand * Wire Gauze * Gas Hose * Thermometer (Celsius) * 250 ml beaker Method:
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have dipoles due to its polar bonds but they do not have H atoms that can be donated into a H-bond. The anions which are the O- and N- of sodium saccharin are not solvated therefore are “naked” and the reaction is not inhibited and preceded in an accelerated rate. The reaction was an SN2 reaction. Since the Oxygen and Nitrogen are more electronegative than the carbon on which they’re attached electrons are pulled towards O- and N- attracting the ethane from Iodoethane. Iodine being more electronegative
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Enzymes lower the amount of energy needed in a chemical reaction. This happens because enzymes are catalysts‚ so they speed up the activation rates that occur in living organisms. Without enzymes‚ it would be difficult to break down particles like food in the digestion system. Enzymes are all very specific to what chemical reactions they will work with‚ and the temperature‚ pH‚ and salt concentration have to be a specific levels in order for the enzyme to function. The structure of each enzyme has
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The Effect of Visual Stimuli on Heart Rate HL Biology James Kosiol Focus Question What is the effect of a timed visual stimuli (45 seconds)‚ in the form of flashing coloured lights (White 0/s (control)‚ White and Black 1/s‚ Blue 2/s‚ Red 3/s‚ Green 4/s and Multicoloured 5/s) on the heart rate of the viewer? Table of Contents 1.Design 1.1 Defining the Problem Focus Question What is the effect of a timed visual stimuli (45 seconds)‚ in the form of flashing coloured
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3A Task 1 Aim: the aim of the experiment is to find the best temperature to ferment yeast at. Hypothesis: the yeast will ferment the best at 60 degrees Celsius. Independent variable: the temperature of the water the yeast is put in to ferment. Dependent variable. The amount of air bubbles the yeast produces. Controlled variable: the amount of yeast and glucose in each syringe. Uncontrolled variables: human error in counting. Materials : Plastic soft drink bottle cut to size Marking pen
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Polymerase chain reaction The Polymerase chain reaction (PCR) is a biochemical technology in molecular biology to amplify a single or a few copies of a piece of DNA across several orders of magnitude‚ generating thousands to millions of copies of a particular DNA sequence. Developed in 1983 by Kary Mullis‚ PCR is now a common and often indispensable technique used in medical and biological research labs for a variety of applications. These include DNA cloning for sequencing‚ DNA-based phylogeny
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The effects of Visual Distraction on Reaction Time Abstract Distraction has been associated with affecting human reaction time. These associations have been obtained from studies focusing on drivers in particular. Driver distraction is very common nowadays and it is associated with many car crashes (Governors Highway Safety Association‚ 2011). Distraction can take forms in visual‚ cognitive‚ auditory and manual handling of the vehicle. In this study the aim was to test the effects of visual
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experiment the objective was to perform a Diels-Alder reaction using cyclopentadiene and maleic anhydride to synthesize the product‚ cis-Norbornene-5‚6-endo-dicarboxylic anhydride. The Diels-Alder reaction is one of the most important 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
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