assessment TA (name): TA (signature): Experiment 1: Recrystallization – Report Sheet Last Name: Xavier First Name: Jessica Date: October 1st 2013 Lab Day/TA/Group: Wednesday(1:35pm)/ Group A Data: 10 marks MP: 169 – 172 C Reactants: Amount p-aminophenol used: mass 1.20g mol 0.0110 mol Amount acetic anhydride used: mass 1.31 g mol 0.0128 mol (Show Calculations) p-aminophenol amount calculation: Mol=Mass(g)/Molecular weight(g/mol)= 1.20g/(109 g/mol)=0.011 mol
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Introduction Enzymes are proteins that act as catalysts; thus allowing the many chemical reactions in life to occur. The purpose of an enzyme is to speed up the rate of a chemical reaction. Without enzymes‚ living organisms would be unable to function properly‚ since the releasing and storing of energy depend on the enzyme’s function (2). Through the process of catabolism‚ complex molecules within organic compounds are broken into simpler molecules. As a result of catabolic reactions‚ energy used
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1 mole of any substance can be defined as: Amount of a substance that contains as many particles (atoms‚ molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one mole
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1. The cell membrane structure is vital to the life of the cell. The cell membrane is shaped as having a phosphate head at the very outer surface‚ and two fatty acid tails hanging from it. The membrane is double‚ so at the tip of the fatty acid tails‚ there are two more fatty acid tails attached to another phosphate head. This is what it looks like: <br> <br>The reason the cell membrane is shaped like this is mainly to control the water flow in and out of the cell. Water is very important to
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PROCEDURE 1. Measure and cut a piece of magnesium ribbon 3.5 to 4.5 cm long. Do not exceed 4.5 cm. 2. Measure the mass of the magnesium ribbon to the nearest milligram (0.001 g) and record the mass. 3. Fold up the magnesium ribbon into a small‚ tight bundle. Tie it with a piece of thread (10 to 15 cm long). 4. Add about 10 mL of 3.0M HCl to a gas collection tube. 5. Hold the gas collection tube at an angle as you fill it completely with tap water‚ until it is nearly overflowing
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of the forward reaction and the reverse reaction are at equilibrium‚ the concentrations of the reactants and the concentrations of the products are rarely the same. * If the forward reaction is nearly complete before the rate of the reverse reaction has increased sufficiently to establish equilibrium‚ then the position of equilibrium lies towards the right. * If a low amount of the reactants have been converted to the products before equilibrium is reached‚ then the position of equilibrium
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How Much Gas is Produced? Julie Dang June 23‚ 2013 Purpose The Company ABC Chemical has asked our group to investigate the gas production from a number of various chemical reactions. The company would like us to measure the amount of product we get when we measure the amount of gas from two reactions. We will then compare our data to the predicted amount which will we will calculate based of the Law of conservation of Mass and Ideal Gas Laws. Methods Materials Thermometer CaCO3
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products react to form the reactants. In a chemical reaction‚ when the rate of a forward reaction equals the rate of a backward reaction‚ it is at equilibrium‚ where the products and reactants stay constant. If there is a change in condition on either reactants or products‚ the position of the equilibrium will shift either right or left to try to lessen that change. For example if the pressure of a product is increased‚ the position of the equilibrium would shift towards the reactant or to the left in order
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JEET SCIENCE ACADEMY CHOWK AZAM (LAYYAH) TIME 2.5 Hr CHEMISTRY 1st YEAR CH # 1‚2‚9‚10 Marks: 85 G.Super . 1 Name…………………………………………...... Objective ROLL NO. ………………………………. Q.NO.1. Encircle the correct answer? (1×17=17) 1. Atoms of which one of the follelement have independent existance: (A) Flourine (B) Krypton (C ) Oxygen (D) Nitrogen 2.18g glucose is dissolved
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8. 174 9. Non-ideal solutions exhibit either positive or negative deviations from Raoult’s law. What are these deviations and why are they caused? Explain with one example for each type. A reaction is of first order in reactant A and of second order in reactant B. How is the rate of this reaction affected when (i) the concentration of B alone is increased to three times (ii) the concentrations of A as well as B are doubled? The rate constant for a reaction of zero order in A is 0.0030 mol
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