not taste any substance in this experiment * Iodine solution and some powders are hazardous. * Wash hands when you have finished. Materials * Eye protection * Well plate * 6 small toothpicks for stirring each powder * 6 white powders: icing sugar‚ cornstarch‚ Aspirin powder‚ baking soda‚ baking powder‚ and the mystery powder * Scoopula * Test solutions in dropper bottles: water‚ universal indicator‚ vinegar‚ and iodine solution
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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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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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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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chemical properties of these liquids. Acetone usually used as nail polish remover dissolves plastic. Vinegar used in cooking and as a condiment begins to fizz when mixed with baking soda. Hydrogen peroxide usually used as a disinfectant reacts to iodine solution and starts to bubble. Oil is used to keep food from sticking to non food surfaces and
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* Slice of onion * Distilled water * Iodine * Watch glass * Glass slide (x2) * Mounted needle Health and safety: Wearing a lab coat protects individuals from iodine staining the clothes. Wearing safety goggles protects eyes from when using the scalpel to cut the onion. Be careful whilst moving around the classroom in case of an accident for example falling over bags and disturbing a group of individuals which results in iodine spilling over onto the floor or even skin. Method:
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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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BIOLOGY LAB REPORT PRACTICAL M1 TESTING FOR MACROMOLECULES Title : Testing for Macromolecules Abstract : To test for macromolecules (carbohydrates‚ lipids‚ nucleic acids‚ and proteins)‚ iodine solution‚ alcohol‚ aceto-orcein stain and copper sulfate solution are used. The conclusions for all of the tests are positive. Introduction: A) Carbohydrate (starch) Carbohydrates are chemical compounds that contain oxygen‚ hydrogen‚ and carbon atoms. They consist of monosaccharide
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ions. The potassium manganate(VII) is an oxidising agent. Potassium manganate(VII) and sulphur dioxide Another redox colour change takes place when potassium iodide‚ which is colourless‚ is oxidised by an oxidising agent to form brown iodine solution. An example of this reaction is potassium iodide solution reacting with a solution of hydrogen
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