atmosphere with an equimolar ratio of the three reactants. TLC monitoring of the reaction mixture exhibited formation of a new product‚ which was purified (Table 1‚ entry 1). Identification of its structure by NMR spectroscopy revealed that it was 2-(4-methylbenzoyl)-1-naphthyl N-(tert-butyl)carbamate (4a). Next‚ in order to improve the yield of 4a‚ the effects of different solvents‚ reaction temperatures and times together with the molar ratio of the reactants were examined in this model reaction‚ for
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Mandatory Experiment 6.2 Studying the effects on reaction rate of (i) concentration and (ii) temperature Theory The reaction used is that between a sodium thiosulfate solution and hydrochloric acid: 2HCl(aq) + Na2S2O3(aq) → 2NaCl(aq) + SO2(aq) + S(s)↓ + H2O(l) The precipitate of sulfur formed gradually obscures a cross marked on paper and placed beneath the reaction flask. The rate of reaction‚ and consequently the time taken to obscure the cross‚ depends on a number of variables such
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different state (for example‚ a solid from the mixing of two liquids) Chemical equations: a representation‚ using formulas and symbols‚ of a chemical reaction. Reactants: The substances that are present at the beginning and undergo a chemical reaction. Products: The new substances that are formed or produced by a chemical reaction. (reactantsproducts) -(aq) for aqueous solution Law of Conservation of Mass: Matter is neither created nor destroyed during an ordinary
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Drew Moyer Mrs. Haire IB Chemistry Experiment 6 Mole Ratio in a Chemical Reaction Background: Mole ratios of reactants are often times figured out by the use of the other products in a chemical equation. However‚ in the instance that the products’ mole ratios are unknown‚ it can be determined through the experiment. This method is called continuous variations. In this lab‚ I determined the mole ratio between Sodium Hypochlorite and Sodium Thiosulfate by using continuous variations of ratios
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Abstract: The objective of the experiment was to prepare Benzilic acid by multistep synthesis starting with benzaldehyde. In this setup however‚ product of the first step‚ Benzoin‚ is provided thereby omitting the first step involving the conversion of benzaldehyde. For this experiment‚ the microscale techniques of reflux‚ crystallization‚ and melting-point determination were used. Utilizing these techniques a product yield of 93% for benzil and 57% for Benzilic acid was obtained‚ as well as
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potential work energy that a system reaction may possess relative to other reactions and can provide data about the bonding strength of the products and reactants as well. If the product substances are given enough energy and experience stronger bonding forces than the reactants‚ the potential energy of the products is lower than that of the reactants‚ the reaction process will create a reaction process. It will release the energy difference as heat and/or work (potential energy)‚ and this is called
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700 gram .700 gram = mass of sodium nitrate and excess reactant collected in the water after the water was evaporated 1.00 g of sodium carbonate and 1.00 g of lead II nitrate was given to start the lab out with. To calculate the percent yield of lead II carbonate‚ the limiting reactant must be identified first. 1.00 g Na2CO3 x 1 mole106 g = 0.00943 mole Na2CO3 1.00 g Pb(NO3)2 x 1 mole331 g = .00302 mole Pb(NO3)2 Limiting reactant: lead II nitrate Next‚ the theoretical yield of lead
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Christian Lecce Mr. Ribarich Wednesday‚ February 20st‚ 2013 Purpose To determine the mass of copper formed when excess aluminum is reacted with a given mass of a copper salt (Copper Chloride dihydrate)‚ and the mole-to-mole ratio between the reactant and the product of a chemical reaction. Apparatus * 150ml beaker * Stirring rod * Ruler * Hotplate * Tweezers * 50ml graduated cylinder Materials * Copper (II) chloride dehydrate * Aluminum foil Procedure
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856lbs 388‚275.07g 1320.62 Company #1 Neils Bohr 2AlPO4 165lbs 74‚842.74 306.86 Company #2 Hello C5H12 663lbs 300‚731.74 4‚166.99 Company #2 Hello 8O2 728lbs 330‚215.25 1‚289.90 Limiting reactant: “Neils Bohr” 2AlPO4 Excess amount: 860.1 Limiting reactant: “Hello” O2 Excess amount: 3‚803.35 Aluminum phosphate A colorless liquid. Insoluble in water. Corrosive to metals and tissue. Non-combustible‚ substance itself does not burn but may decompose upon heating
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hydrochloric acid will change the mol of reactant. It will be affecting the rate if it becomes limiting reagent. I am always going to use 3.00g of calcium carbonate weighed on the electronic balance. Ensure calcium carbonate is pure supply‚ not contaminated. Surface area of CaCO3 The surface area of calcium carbonate should be kept constant. Different surface area of calcium carbonate will change the number of collisions between particles‚ as the calcium carbonate reactants have different exposed area of
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