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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prey is reduced when the prey are at low densities c. the per capita feeding rate of predators is reduced when their density is high d. the per capita feeding rate of predators is reduced when their density is low e. none of the above Question 2. A copepod species (the predator‚ measured in copepods/m3 of water) feeds on algae (measured in cells/m3 of water) in freshwater lakes. Assume that the interaction is well-represented by the Lotka-Volterra predator prey model: where r = 1/week
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TITLE OF EXPERIMENT: An investigation of the iodine/propanone reaction. DATA COLLECTION AND PROCESSING : Chemical Equation: CH3COCH3 (aq) + I2 (aq) ( CH3COCH2I + H+ (aq) + I- (aq) Rate of reaction: R = V T Concentration of reactant after dilution : Volume of reactant x concentration of reactant Total volume of mixture Uncertainty for rate of reaction: R =( V + t ) x R V t Eg
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purpose of this lab was to study the specific characteristics of cations and anions‚ and ultimately to be able to identify an unknown substance based on our studies and tests using the logic trees developed through the experiment. A logic tree is a graphical display of the findings from this lab which‚ through a series of yes/no questions‚ elimination tests‚ will help us to identify and unknown sample. This lab will result in 2 logic trees‚ one for identifying cations and the other
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Grandma’s peanut butter and jelly sandwiches. 1.) Which us prefers jelly? Who prefers jam? And who prefers preservatives? Do you prefer strawberry? Boysenberry? Peach? Grape? It’s all about personal preference‚ especially when it comes to the jelly. 2.) What about peanut butter? Do you prefer chunky? Creamy? 3.) Who prefers theirs on white bread? Who prefers what bread? Transition: Today‚ I am going to tell you how to make what I consider to be the best peanut butter and jelly sandwich. II-
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PBS parents as well as many other sources advise parents keep their children off of technology until they are at least in Preschool. Once in preschool they also recommend technology usage to be at a minimum. Babies having access to television and cell phones seems to cause minimal harm at first‚ but what is noted as a concern is that children and babies grow developmentally through social interaction. Every minute a child spends watching the television or watching their parent on their phones is
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Soda and Mentos Reaction: Any kind of Soda and Mentos interaction will expedite a geyser of both carbon dioxide and foam. Soda has a few properties‚ for instance‚ an sweetener or an artificial flavouring‚ but it’s main factor that contributes to the reaction is carbonated water. Carbonated water is basically water with Carbon Dioxide compressed within it‚ it causes the drink to be fizzy and bubbly. This contributes to the reaction because it the fizz and bubbles are gas‚ which tries to escape from
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water). The liquid media was on a hot plate‚ then an oven mitt was used to carefully transfer onto 4 petri dishes at a tilted angle‚ with the petri dish lids at an angle as well to reduce airborne contamination. After the end of each pour—no more than 2/3 of the petri dish’s capacity—the flask containing the liquid media was sterilized briefly through the Bunsen-burner by running it through the flames a couple of times for a few seconds‚ then the aluminum foil was also briefly sterilized by this same
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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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Pragmatics 16:2/3.329-360 (2006) International Pragmatics Association SPONTANEOUS AND NON-SPONTANEOUS TURN-TAKING Maite Taboada Abstract Turn-taking is usually considered to follow a simple set of rules‚ enacted through a perhaps more complicated system of signals. The most significant aspect of the turn-taking process is that‚ in most cases‚ it proceeds in a very smooth fashion. Speakers signal to each other that they wish to either yield or take the turn through syntactic‚ pragmatic‚ and prosodic
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