residue. Bubbles of gas were seen. (i)Suggest a name for the gas. (ii)Explain the reaction that was probably taking place in the crucible. (iii)Write a balanced equation to represent the reaction that was probably taking place in the crucible. 2.One of the factors that affects the formation of products during electrolysis is whether the electrode is active or inert. The following circuit was set up to investigate this factor. W and X are carbon electrodes. Y and Z are copper electrodes. a)Write
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OF VITAMIN C Section: Pre-Laboratory Answer the following questions before coming to the laboratory. Give the reason for the following; Iodimetric titrations are usually performed in neutral or mildly alkaline (pH 8) to weakly acid solution. 2. Iodine solutions are prepared by dissolving I2 in a concentrated solution of potassium iodide. 3. Iodimetric determination of vitamin C is performed rapidly after preparing vitamin C solution 9-1 E XPERIMENT 9 IODIMETRIC TITRATION
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Narrative Planner—“The Pomegranate Seeds” Who? Describe the character whose story you plan to tell. Character Name: How would you describe this character? Why? Physical Appearance Gloomy but handsome. He was gloomy because he was very lonely in his dominion. Feelings Very sad and lonely Because he has been by himself for so long he has grown tired of it. Attitude Desperate‚ and sad He really wants Proserpina to live with him and so far he is not succeeding. What? Conflict Character
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Table 1 Vinegar - 3 - 2.2 Sodium BiCarbonate Solution - 9 - 8.3 Lemon Juice - 4 - 2 Laundry Detergent - 8 - 8.2 Bleach - 12 - 12.0 Ammonia - 12 -
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Lecture 12 Chapter 6 6.1 Thermochemistry: Energy & units (p.227) From observation we know‚ that - some chemical reactions begin as soon as the reactants come into contact with each other (precipitation reactions) - some reactions are slow or even so slow at room temperature that even lifetime is not enough to observe a measurable change (rusting of iron‚ tarnishing silver) Also‚ almost all chemical reactions involve exchange of heat (or energy): in combustion reactions
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compares the enzyme activity with the pH it is at for intestinal enzymes. The optimum pH for enzymes changes depending on where the enzyme is for example intestinal enzymes have a pH optimum of around 7.5 whereas stomach enzymes have a pH optimum of about 2. The enzymes also denature if they exceed there optimum temperature by a certain amount depending on the enzyme How enzymes work Enzymes are biological catalysts. They are proteins folded into complex shapes that allow smaller molecules (substrate
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KNOWN 1 | BARIUM | GREEN | KNOWN 2 | CALCIUM | RED | KNOWN 3 | SODIUM | ORANGE | KNOWN 4 | RUBIDIUM | PURPLE | KNOWN 5 | POTASSIUM | BLUE | KNOWN 6 | LITHIUM | VIOLET | UNKNOWN 1 | SODIUM | ORANGE | UNKNOWN 2 | POTASSIUM | BLUE | 1. Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did. Unknown 1 was Sodium‚ as it burned with the same colored flame as the sample of Sodium‚ and Unknown 2 was Potassium‚ as it’s flame was concistent
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water is 1.00 g/mL. The water has absorbed the heat of the metal. So‚ qwater = qmetal m=mass of water= density x volume = 1 x 26 = 26 grams ΔT = T(mix) – T(water) = 38.9 – 25.3 = 13.6 q(water) =26 x 13.6 x 4.18 q(water) = 1478 Joules 2. Using the formula qmetal = m × c × ΔT‚ calculate the specific heat of the metal. Use the data from your experiment for the metal in your calculation. qmetal = - 205 J = 15.363 g x C x (27.2 – 100.3
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6.05 Logan Hotaling Materials Needed: 1. Alka-Seltzer 2. Glass 3. Water 4. Timer Procedure: 1. First you need to fill a glass up with 8oz of water and have it be 25 degrees Celsius. 2. Then you drop the Alka-Seltzer in the water and time how long it takes it to dissolve in the water. 3. Then we need to make the temperature go up then we need to drop the Alka-Seltzer in the water again and see how long it takes it to dissolve with the new temperature. 4. Now
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the electroactivity series affect the overall voltage of the galvanic cell? Background Information: The voltaic cell converts chemical energy to electrical energy to generate electricity. There are usually 2 electrolytes used containing spectator metal ions. A salt bridge is used to connect the 2 electrolytes in order to enable the transfer of ions. Circuit is connected from electrode to electrode for mobile electrons to pass through. A galvanometer is always used to detect the electron flow of voltaic
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