Prepare solution of sodium thiosulfate, place 0.25gm (250 mg) of Na2S2O3 in 100ml beaker, add 20 ml of water and mix until dissolved. Step 2: Prepare solution of potassium iodine. Add 10 gm of KI to a 100 ml beaker and add 20 ml of water and mix until dissolved. Step 3: Obtain a 600 ml beaker, add KI and Na2S2O3 solutions, then add 60ml of 1M HCl. Step 4: Finally add 50ml of .1M H2O2, as soon as the H2O2 is added start timing the reaction. Stop timing when the Iodine appears (solution changes
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The oobleck, or cornstarch-water, mixture can act like both a solid and a liquid. This mixture is a suspension. A suspension is a mixture of two substances- in this mixture, it’s a solid, corn starch, dispersed in a liquid, water. Sir Isaac Newton stated all liquids have viscosity: a measurable property that determines the thickness of a liquid or resistance of that liquid to flow. Newton also stated that viscosity changes with temperature. A change in temperature results in a change in viscosity
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indicates the presence of glucose. The IKI moved from the beaker into the dialysis bag, this resulted in a change of color to black within the bag. This made the concentration within the bag equal to the concentration outside the bag. The glucose solution moved out of the bag making glucose present in the beaker. The glucose moved to make the solute concentration inside and out equal. If the initial and final % concentration of glucose and IKI for in the bag and in the beaker were given they
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faster than salt. The liquids used are tea, water, and club soda. These liquids should have a different taste, color, odor, and purpose (O’Leary, Shelly, 91). Water molecules take up most of the room in the container (O’Leary, Shelly, 88). A solution is a mixture of a solute and solvent (O’Leary, Shelly, 88). During the experiment, keep a cup of plain liquid to compare (O’Leary, Shelly, 93). Nancy K O’Leary and Susan Shelly stated, “If you use mile or orange juice, for example, you won’t be
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the environment. Lesson 2: Identify the problem. Lesson 3: Identify the solutions. (What tools are available to perform the project?) Lesson 4: Evaluate the solutions. (If there are assumptions, what are they?) Lesson 5: Evaluate the ethical and social issues. (What ideas are compatible or incompatible with the problem and solutions?) Lesson 6: Propose the best solution. Lesson 7: Conclude your project experience. B. Write one paragraph for each
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Diffusion “You made me ink” In this experiment we placed Glucose in a clear bag, and placed the bag in Iodine and waited for it to change colors indicating that the Glucose and Iodine reacted to one another. We also placed an egg in salt water solution and weighed it every 15 minutes. The results for the glucose and iodine were inconclusive because our experiment never changed colors nor did we get a chance to do the second half. Diffusion is the movement of molecules from a region of higher
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Filtration: is a technique used for two main purposes; 1. to remove solid impurities from liquid and 2. Collect desired solid from the solution form which it was precipitated or crystallized - Gravity Filtration → Decantation (separate liquid form large insoluble particles) Decantation: Large, heavy, insoluble particles, with careful pouring, you can decant the solution, leaving behind the solid particles that will precipitate (settle) to the bottom of the flask. “Decant” means to carefully pour out
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release all the impurity crystals being trapped up in the solid form of the desired compound. Furthermore, the impurities should have higher solubility than the desired compound in that chosen solvent, so that all the impurities would remain in the solution while recrystallization takes place.2,3 In case no single solvent can be found, a system of two solvents can also be used for recrystallization. Generally speaking, in this solvent pair, one of them can completely dissolve the sample while the other
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Solvation Models There are some methods which are established in order to observe the effect of solvation in a system. These models are distinguised as Polarizable Continuum Model or Implicit model, Explicit model and Hybrid Explicit Model. These three models subdivide and they will be discussed further. While using these models, the one which fits to the system should be chosen carefully since reducing the cost and time is very significant. When the time gets longer, more payment is done and also
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