Solids: Recrystallization and Melting Points Reference: Chapter 3. Solids: Recrystallization and Melting Points. Read pages 93-94 and 113-117. Experimental procedure‚ pages 118-119. Parts 1-3. Part 1: Melting points of Urea and Cinnamic Acid. Part 2: Melting point of unknown. Part 3: Melting point of Mixture- Urea and Cinnamic Acid (take melting points of mixtures in 1:4‚ 1:1 and 4:1 ratios). Reactions Main Reaction: Not a chemical reaction but a physical reaction. Urea in solid mixed with
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Determine the melting points of two organic compounds known to have the same melting range when pure. b) Determine the mixture melting point of a mixture of the two pure compounds. c) Identify an unknown organic compound by determining its melting point and mixture melting point. Procedure and Observations: Using the procedure outlined in Appendix A of the Lab Manual‚ approximately equal samples of p-Nitrophenol and acetanilide‚ which are known to have the same melting range of 113-114
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Title Freezing and Melting Point Objectives 1. To gain proficiency in constructing a graph and plotting data points. 2. To determine the freezing points of a compound from the graph of decreasing temperature versus time. 3. To determine the melting points of a known and unknown compound. Introduction Physical changes are the changes in the physical properties of a substance (Moore‚ Stanitski & Jurs‚ 2009). Freezing point is the fixed temperature at which a pure liquid converted into crystalline
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communists and caused the downfall of their country’s economy. This includes the increase of poverty along with the increase of death rates. The two dictators we chose were Pol Pot‚ dictator of Cambodia and Idi Amin Dada the president of Uganda. Both were different ‚but much alike in certain ways. Pol Pot (Saloth Sar) Pol pot (aka Saloth Sar) was a Cambodian revolutionary who led the Khmer Rouge from 1963 to 1997. From 1963 to 1981‚ he served as the General Secretary of the Communist Party of Kampuchea
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Results My unknown sample was number 18. I did three melting point trials‚ which resulted in a melting point range of approximately 120°C to 122°C‚ as shown in Table 1. I also did two mixed melting point trials using Benzoic Acid and Succinimide‚ as shown in Table 2. Percent recovery is 28.26 grams. Table 1: Unknown Melting Point Trials Trial Melting Point 1 120°C – 122°C 2 120°C – 122°C 3 119°C - 122°C Table 2: Mixed Melting Point Trials Trial Benzoic Acid MP Unknown #18 MP Succinimide
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Holocaust and Pol Pot in Cambodia were both horrible events in history. They were both similar and different in many ways. In both events victims were sealed from the outside world. Women‚ men‚ and children were being overworked and starved. And even after all the hard work thousands of them were being killed. Both leaders had different plans‚ but one thing they both had in mind was genocide. In both events the victims were being sealed off from the outside world. In Cambodia‚ Pol Pot wanted all culture
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Pol Pot Speech History Assessment My name is Pol Pot‚ but I wasn’t always born with this name. I was born as Saloth Sar‚ I was the notorious leader of the Khmer Rouge (also known as the Red Cambodians). I was responsible for the deaths of over 25% of Cambodia’s population between 1975-1979. In just four years I killed
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In the article‚ Why are Starfish ‘Melting’‚ by Jane J. Lee‚ they explain that millions of starfish‚ for the past year and a half‚ have had a lethal virus which has turned them to white goo. The virus is a kind of parvovirus‚ which is “the group of viruses that cause gastroinintestical problems in unvaccintated dogs.” Although this virus is killing many starfish there isn’t very much that researchers can to to try to stop it. A marine ecolologist at Cornell University of Washington in Seattle
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Creative Technique There are a few technique that i really like. The creative technique that I chose is the Pot Bound technique. The pot bound technique works with clients who find themselves stuck in situations that offer no room for personal growth or development. The client will usually feel stifled. The analogy used for this technique is that you are like plant that has been put in a small post. Although you have grown to some degree‚ you will never gro to your full potential unless you change
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Low-Carb Lettuce and Tuna Salad Ingredients: • 1 ½ cups canned tuna in water‚ drained • ½ romaine lettuce‚ finely chopped • 2 teaspoons Dijon mustard • ½ cup Greek yoghurt • 1 tablespoon lemon juice • 2 tablespoons sour cream • Dash of sea salt Directions: 1. Place the tuna in a bowl and flake it with a fork. Mix in lettuce‚ mustard‚ yoghurt‚ sour cream‚ lemon juice and salt. Toss the salad then place it in the fridge for 1 hour. 2. Transfer the salad to smaller bowls and serve cold. 3. This recipe
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