‘13 EXPERIMENT # 2 RECRYSTALLIZATION; FILTRATION OBJECTIVES: 1. To perform recrystallization and filtration of given impure organic compound. 2. To purify impure acetanilide using reflux condenser apparatus and Hirsch funnel filtration. 3. To determine percentage recovery of pure material (which is)‚ purified by recrystallization and filtration. SAFETY PRECAUTIONS: 1. Operate the aspirator with the maximum water-flow using a stop cock to control the amount of vacuum. 2. Do
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it would be called an alloy. 2. An aqueous solution of KCl is colorless‚ KMnO4 is purple‚ and K2Cr2O7 is orange. What color would you expect of an aqueous solution of Na2Cr2O7? Explain. Orange. 3. Explain why hexane will dissolve benzene but will not dissolve sodium chloride. Sodium chloride is an ionic compound. 4. Some drinks like tea are consumed hot or cold‚ whereas others like Coca-Cola are consumed only cold. Why? For taste reasons‚ these drinks can be drunk if the user likes It
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conquest. 1. The Han Dynasty used Confucianism as a way to expand their empire; they spread it through trade and order. 2. The Han Dynasty spread their empire in a non-relentless way‚ or less often than the Roman Empire. 3. Romans used their reasoning from the gods‚ who often represented war‚ to conquer others relentlessly. 4. Peaceful religion was not as stressed for the reason for expansion‚ more so through blood shed and unrest B. In addition‚ the two
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Across the period‚ the metallic character of the Period 3 elements decreases. This is evident as sodium‚ magnesium and aluminium‚ the first three elements in period 3‚ are all classified as metals. We observed that they display highly metallic characteristics‚ as they are all solid‚ malleable and lustrous. On the other hand sulfur‚ which is further along the period in group 16‚ is too a solid although it is quite brittle and in powdered form. It is a dull‚ pale yellow and does not possess the shiny
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Making Sodium Chloride Equipment: Method: 1. Firstly‚ safety measures were taken by putting on laboratory coats‚ wearing safety goggles and tying long hair back. This was to protect clothing‚ eyes and to avoid burning as the experiment included dealing with open flames. 2. The equipment needed (as shown and labelled in picture A) was collected. 3. Using a measuring cylinder for each‚ to be exact with measurements‚ we measured out 10cm³ of HCl and 10cm³
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In the experiment‚ we tested a sodium chloride solution. Along with the tested solution‚ control groups (water and sodium phosphate) were used to be help understand whether or not NaCl was a buffer. Water was the negative control group and sodium phosphate was the positive control group. If NaCl was a buffer than the pH would be stabled as the sodium phosphate buffer. If NaCl was not a buffer than the pH would fluctuate like the negative control‚ water. During the first trial and prior to the drops
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Importance of 3 Period Name Lesson For the purpose of giving a clear perception of an idea in association with language‚ Montessori advised that the “three period lesson” of Seguin should be used. The periods are: 1st period: “The association of the sensory perception with the name”. Example: Give the child a large and a small cylinder and say “this is large” and “this is small.” 2nd period: “Recognition of the object corresponding to the name.” Example: Ask the child to indicate which is the
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PHYSICAL PROPERTIES OF THE PERIOD 3 OXIDES These pages explain the relationship between the physical properties of the oxides of Period 3 elements (sodium to chlorine) and their structures. Argon is obviously omitted because it doesn’t form an oxide. A quick summary of the trends The oxides The oxides we’ll be looking at are: |Na2O |MgO |Al2O3 |SiO2 |P4O10 |SO3 |Cl2O7 | | | | | |P4O6 |SO2 |Cl2O
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crystallization indicates that the solution has become statured. This means that at each temperature recorded the solution contains the maximum quantity of solute that can be dissolved in that amount of solvent. Standard solubility table of Ammonium chloride Solubility g/100gH2O Temperature /°c/±0.1 60‚3 71‚3 55‚5 59‚3 51.3 52‚4 47‚7 47‚2 43‚4 41‚8 Uncertainties and errors of volume and temperature VOLUME H2O/ml/±0.05 Percentage uncertainty/% Temperature/°c/±0.1 Percentage
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There are many important periods in Japanese history. But‚ if I were to narrow it down to the three most important periods‚ it would be the Yayoi period‚ the Heian period‚ and the Edo period... IN MY OPINION Yayoi The Yayoi period lasted from about 400 or 300 BC until 250 AD. This period followed the Jōmon period. This period is named after Yayoi town‚ the subsection of Bunkyō‚ Tōkyō‚ where archaeological investigations uncovered its first recognized traces. The culture of the Yayoi Era is characterized
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