the water and put it into a test tube 10.Allow it to heat for 1 minute and see if there is any reaction in tube 11.Put starch in dialysis tube 12.Leave the substance in a beaker for 15 minutes to give it the time to diffuse 13.Add 2ml iodine to it and check if it has the same reaction as the lab report before 14.If there is time left‚ do control experiment to see if there is no reaction without the experimental substances (sucrose‚ glucose and starch) 15.If time left do negative
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The purpose of the lab “All in the Family” was to compare the reactivity of the halogens Chlorine‚ Bromine‚ and iodine by observing the reactions between their elemental forms and their ionic forms. To accomplish this experiment‚ we first added a squirt of pet ether to two test tubes. Then‚ we added the same amount of Cl2 to both of the tubes‚ shook the mixtures‚ and recorded the color that resided in each mixture as the initial color. After‚ a squirt of NaBr was added to one test tube‚ and a squirt
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The most common organic molecules are carbohydrates‚ lipids‚ and proteins. Carbohydrates contain carbon‚ hydrogen and oxygen with a ratio of 1:2:1‚ this means that for every 2 hydrogen atoms there is one carbon atom and one oxygen atom. They are necessary for the body to function properly because they provide the fuel that burns to produce energy. Carbohydrates come in the class of either a monosaccharide‚ disaccharide‚ or polysaccharide. Monosaccharides are the simplest form of a carbohydrate‚ disaccharides
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VI. Results and Discussion In this exercise‚ the goal was to produce acetylsalicylic acid through the organic synthesis from the reaction of salicylic acid to acetic anhydride‚ the starting materials. Instead of using acetic acid‚ acetic anhydride was used as solvent since the anhydride reacting with water to form acetic acid tends to drive the reaction to the right. It results from the elimination of a molecule of water from two molecules of acetic acid (see Fig. 11.2). Figure 11.3 below
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in identifying fats‚ protein‚ and carbohydrates in food. Procedure: Part A- Tests for Detecting Carbohydrates In this part you will conduct the molisch‚ benedict‚ and iodine tests. Purple in the molisch test indicates a positive test. Benedicts test will result in a brick red/brown color for a positive test. For the iodine tests‚ a blue‚ red‚ or violet color indicates a positive test. Part B- Test for Detecting Fats: The Grease Spot Test Perform the grease spot test‚ which will help to detect
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evidence because during the Iodine test it didn’t turn purple or blackish so there was no starch‚ and Evidence is like E because there was bubbles during the vinegar test. That’s why I know that Miss Tavaglione’s Dr. Stench’s Deodorizing Foot Dust was the evidence and the mysterious powder at the scene. That’s how I know Miss Tavaglione took the gradebook. The Most useful powder test I used was the heat test because E‚ B‚ and evidence all had similar reactions during
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substance #2 Paper towels 600 ml beaker Brown paper Biuret reagent Benedict’s solution Iodine solution Procedure: 1. Place test tubes in the test tube rack. Use the grease pencil to label each test tube based on the substance that will be placed in them. 2. To test for starches‚ fill each test tube with 5ml of the substance indicated by the label. 3. Add 5 drops of iodine solution to each test tube. The contents will change to a blue-black color in the presence of starch
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Oxidation and Reduction Mnemonic: OILRIG Oxidation Is Loss‚ Reduction Is Gain Oxidation → the loss of electrons from an atom or an ion→ always happens at anode (positive electrode) → think anOde (O2 in the electrolysis of water xp) Redox reactions: Reactions involving the transfer of electrons e.g. burning‚ rusting‚ photosynthesis‚ respiration and the browning of apples. happens in three types of reactions: 1. addition of oxygen 2. removal of hydrogen 3. increase in valency (how easily an atom
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Identifying Organic Compounds 2. Purpose/Problem: I am doing this experiment to find out what kind of organic compounds are in test tubes A‚ B‚ C and D. I am curious to know if substance D was the lipid because it seemed thin and had a slightly yellow tint of color to it. 3. Research: In my research I was informed about facts and appearances of lipids. First of all lipids are non-polar compounds‚ thus they won’t dissolve in water. This is also known as being hydrophobic. They are made with one
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of bacteria? Gram Stain This separation is based on differences in what physical trait? The separation is based on differences in the structure of the cell walls What is the iodine used for in this staining technique? The iodine in this staining technique is used after the crystal violet is applied. The iodine then affixes this and then a decolorizer is applied to take away the primary stain. Why is it important to heat fix the bacteria prior to the staining procedure? It is
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