Manual. Vol. 2013-2014. Plymouth: Hayden-McNeil. 32-35. Data/Results: Part A: In the potassium iodide solution‚ I think there were potassium atoms as well as iodine atoms. In the lead nitrate solution‚ I think there were lead and nitrate ions. The potassium atoms and the lead atoms can be classified as cations‚ since they are metals. The iodine atoms and the nitrate ion can be classified as anions since they are nonmetals. Upon mixing‚ the solution turned into a cloudy yellow color. Evidence that a
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chemical reaction but does not become part of the end product. Amylase digests starch by catalyzing hydrolysis‚ which is splitting by the addition of a water molecule. The presence and absence of starch can be confirmed by several tests such as the iodine test‚ Benedict’s and Fehling’s test. In general‚ a blue-black color indicates the presence of starch. The objectives of this experiment are to examine the enzymatic activity and specificity of salivary amylase depending on changes temperature and
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chloroplasts‚ where the photosynthesis occurs. During experiment‚ two leaves were tested for the presence and localization of starch. One leaf was a light-grown plant with mask‚ and the other was a dark-grown plant with mask. Both leaves were soaked in iodine solution and then rinsed in order to observe the pattern of staining. According to the result‚ the light-grown leaf’s masked areas had no blue-black coloration and the unmasked area turned blue-black in color. The blue-black coloration of the leaf
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Part I: Reaction between zinc and iodine Watch the Video. http://www.youtube.com/watch?v=xT9V7Y1iKYc Observations: Describe what happened when the water was added. A reaction happened and the iodine exploded into a purple gas Questions and conclusions: 1. Balance the equation‚ if necessary‚ for the reaction between zinc and iodine. Zn + I2 ZnI2 It is balanced 2. Classify the reaction that occurred between the zinc and iodine. redox 3. What evidence was there
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It is almost always the first test performed for the identification of bacteria. The primary stain of the Gram’s method is either crystal violet or methylene blue‚ each almost equally effective. The microorganisms that retain the crystal violet and iodine mixture appear purplish brown under microscopic examination. These microorganisms that are stained by the Gram’s method are classified as Gram positive. Others that are not stained by crystal violet are referred to as Gram negative‚ and appear in
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we were given the element Silver (Ag) which was first mixed with chloride (Cl). Together the two mixtures created a very white‚ milky type which is known by the name of Silver Chloride (AgCl). Iodine (I) was then mixed with silver to create a yellowish‚ whitish color which is normally called Silver Iodine (AgI). The mixture followed is Silver Oxide (Ag2O) which happens to contain hydroxide (OH) as well a silver. This compound ended up turning a very grey-brown like color as well as being gritty.
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Carbohydrates There were many ranges of color changes in the Benedicts test and Iodine stain. For the Benedicts test‚ this oxidation/reduction response changes the arrangement of the reducing sugar creating a colored precipitate. The change in color is correlated to the first concentration of the reducing sugar. For the iodine test‚ the three dimensional structure of various polysaccharides permits them to react with the iodine stain to produce a certain color. As far as the molecular level‚ there is an
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salt water will look “parched” compared to the onion in distilled water. The whole cell will be smaller and shriveled. Materials Dialysis tubing‚ starch solution‚ iodine solution‚ raw egg‚ vinegar‚ molasses‚ onion‚ and salt water. Procedure See lab procedure Observations Procedure A: At the beginning of the procedure‚ the iodine solution in the beaker was slightly yellow‚ and the starch solution in the dialysis tubing was milky. After about an hour‚ the inside of the dialysis tubing was very
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used as a test site for experiments involving nuclear reactors‚ high-powered lasers‚ and rockets. In the 1959 meltdown‚ "an estimated 13‚000 curies of iodine-131 and 2‚600 curies of cesium-137 escaped fro the reactor" (Rutshman). Iodine-131 is a radioactive form of iodine and is produced in nuclear reactors when uranium is split. This form of iodine is very radioactive and very dangerous. Once this chemical is entered into the body‚ the radiation damages the thyroid‚ increasing the risk of cancer
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CHEMICAL EQUILIBRIUM Reversible reactions and dynamic equilibrium Ammonia (NH3) is an important industrial chemical that is used in the manufacture of fertilisers. It is manufactured by reacting hydrogen with nitrogen. The reaction is said to be reversible and the conversion of reactants to products is never complete. N2 + 3H2 2NH3 A reversible reaction is a reaction which can take place in either direction When the concentrations of the reactants and product have become constant‚ a
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