In recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?
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In recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?
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- Why is recrystallization not applicable to samples which contain large amount of impurities?Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.Please use phase diagram to explain why micro-segregation and macro-segregation happen during practical solidification.
- Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.Filter paper is usually a poor material on which to powder a solid sample before introducing it into a capillary melting-point tube because small particles of paper may end up in the tube along with the sample. Why is this undesirable? and how might the presence of paper in the sample make the melting-point determination difficultIn reference to surface chemistry, define dialysis.
- -T-4 A B C 2. The TLC plate (left) shows three lanes; the lower dotted line is where the original spots were made and the upper dotted line is the solvent front. You may assume that the solvent was non-polar and the TLC material was silica. Explain, using intermolecular forces, to describe what's happening in all three lanes (A, B and C). Hint: Start with the question: "Which lane shows the more polar substance?"Nano chemistry questions! True or false? 1. Bulk materials have almost constant properties regardless of their size and shape. 2. An important parameter that determines the functioning of nano materials is surface area (SA) to volume (v) ratio 3. Top-down approach are required for synthesis of nanomaterials 4. UV-visible spectroscopy can be used as a simple and reliable method for monitoring the stability of nano particles solutions.PAPER CROMATOGRAPHY • Define chromatography • Demonstrate an understanding of the process of chromatography • Describe the steps involved in a chromatography investigation Explanation Coloured inks are often made up of several different inks. Each colour of ink will get carried a different distance by the water, allowing you to see all of the different inks. Try this with different colours to see what actually goes into a colour. This technique is called chromatography and can be used in chemistry to find out what is in an unknown mixture. II. Materials .Felt tip pens (non-washable) . Kitchen roll .A bowl or cup . Water • Scissors III. Health and safety • Make sure that you thoroughly clean any equipment after the experiment before using for food IV. Procedure Method 1 1. Take a sheet of kitchen roll and draw a simple picture with a non-washable felt tip pen. 2. Place the sheet over an empty bowl. This is to keep the paper from getting too wet. 3. Carefully add a few drops of water…
- 2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible? Group of answer choices To minimize the amount of pure solid lost due to its solubility. To minimize the cost of the recrystallization. To reduce the time needed to filter the pure solid from the solvent after recrystallization. To minimize the amount of hazardous materials used.Select the phenomenon that is being described by each statement a. Breaking b. Agglomeration c. Coalescence d. Ostwald ripening e. Creaming f. Aggregation g. Flocculation Which observes the clustering of individual dispersed droplets? Which observes the separation of phases due to the fusion of globules? Which annihilates the film surrounding the particles in an emulsion? Which process is described as the coming together of particles? Which causes the rise of dispersed particles to the surface of an emulsion? What process is described as the deposition of small particles on larger particles? Which observes the quick separation of the two liquids to their original state?What are the differences between a simple distillation and steam distillation?