1.1.2 Identify the difference between elements‚ compounds and mixtures in terms of particle theory Elements are simplest form substance meaning cannot be decomposed further physically or chemically. They are made up of same type of atoms only e.g. helium‚ oxygen. Compounds are pure and they consist of 2 or more elements bonded chemically (fixed ratio). They can be decomposed chemically. E.g. sodium chloride‚ carbon dioxide Mixtures are the blending (physically combined‚ hence can be separated)
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to purify individual chemical compounds from mixtures of compounds’ (Wikipedia‚ 2011). This method is similar to thin layer chromatography‚ but the compounds in the mixture are collected separately. Green dye is used in this experiment that consists of blue and yellow constituents. Materials and Methods: As per SCI105 Chemistry laboratory manual 2012‚ Brooks‚ 2012‚ page 12-19. With the following changes: The mass of recrystallization mixture is 10.05g not 10g. Results: Part
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processes‚ especially in water treatment and sewage treatment in which undesirable constituents are removed by absorption into a biological film grown on or in the filter medium as in slow sand filtration. Decantation is a process for the separation of mixtures‚ by removing a top layer of liquid from which a precipitate has settled. Usually a small amount of solution must be left in the container‚ and care must be taken to prevent a small amount of precipitate from flowing with the solution out of the container
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this‚ multiple trials of the extraction process should be conducted to average out the actual percent recovery. Another improvement would be to test more mixtures of 4-nitroaniline and naphthalene of varying ratios and compare the percent recovery and melting points of those compounds extracted. This will allow for a comparison to the 1:1 mixture and clarify the success of extraction possible depending on the composition
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Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase‚ which carries it through a structure holding another material called the stationary phase. The various constituents of the mixture travel at different speeds‚ causing them to separate. The separation is based on differential partitioning between the mobile and stationary phases. Subtle differences in a compound’s partition coefficient result in differential retention
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and different test compounds were applied‚ and results were noted as for changes in colors of precipitates or solutions. For Dische Test‚ light blue was obtained for RNA and dark violet for DNA. For Murexide Test‚ a yellow layer was obtained with a mixture of red color and eventually became yellow or orange after addition of warm water. For John-Wheeler Test‚ a violet precipitate was obtained and lastly for Phosphate Test‚ a yellow precipitate was obtained. Keywords: Nucleic Acids‚ Dische Test‚ Murexide
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concentrated sulfuric acid and 0.75 mL of concentrated nitric acid. We then mixed the two solutions‚ the mixture of sulfuric acid and nitric acid to the mixture of methyl benzoate and sulfuric acid. When the nitrating solution was being added to the mixture o of methyl benzoate and concentrated sulfuric acid. There was a color change. The color change was from clear to light yellow. As we added more of the mixture the color change increased. The color change was due to the conversion of aromatic properties
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you accurately weigh your sample of acid and titrate to a phenolphthalein (colorless to pink color) end point using an accurately known dilute solution of sodium hydroxide (0.1000 M). If your unknown is soluble in a greater than 50% ethanol/water mixture‚ then use bromothymol blue as the indicator to give a yellow to blue color change. Using an analytical balance‚ accurately weigh out approximately 0.2 g of your unknown acid (measured to 0.001g) and dissolve in 50 – 100mL of water. It may be necessary
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less DNA that will be broken down allowing us to view the DNA in the test tube. III. Hypothesis: If you add certain chemicals to the smashed up strawberry the sticky DNA can be retrieved from within the cells because of ethanol put into the mixture. IV. Experiment: A. Variables: i. Independent- strawberry ii. Dependent- The DNA iii. Controlled- Extraction solution and ice cold ethanol B. Materials: * Strawberries * Test tubes and test tube rack * Extraction
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Physical and Chemical Changes Lab Question: How do you distinguish a physical and chemical change? Hypothesis: If we use these materials and use magnets‚ water‚ burners‚ and filters on the mixtures and elements given we should determine what kind of effect these materials given will have on these mixtures and elements‚ physical or chemical. Procedures: -Part A: Record all observations of Part A in Data Table 1 1. Label each substance on seven pieces of paper. Put two pieces of magnesium
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