Purpose: To find out the densities and to find out the name of the unknown metals. (Based on the extensive and intensive properties) Check up the words mass‚ volume‚ density‚ extensive properties‚ and intensive properties. Where do the units for mass and volume) come from and what do they mean? What is the density of distilled water? What is Archimedes principle? Does temperature affect the density of a solid? Liquid? Gas? Materials: Safety glasses‚ 10‚ 25 or 50 mL graduated cylinders
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Flame Test Lab Question: When a compound is placed in the flame of a burner‚ what happens to the color of the flame? Hypothesis: When the compound is placed in the flame‚ the flame changes color depending on the chemical compound. When they’re heated‚ they gain energy and changed color sometimes. Safety Requirements for this Lab: Wear goggles at all times. If you want to remove them to write in your notebook you may sit at a table in the center of the room. When you sit down remove them
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the alkyl halide formed (1° or 2° halide) and to determine whether Markovnikov’s addition occurred‚ two qualitative tests can be used: (a) reaction with alcoholic silver nitrate solution and (b) reaction with sodium iodide in acetone. For the silver nitrate test‚ one drop of alkyl halide is added to 2 mL of 0.1 M solution of silver nitrate in
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Question/Purpose: The Question or Purpose of our lab is to answer the question “How is the germination of a seed affected by sunlight?” Experimental Hypothesis: We believe these results will occur. 1. The seeds that are water deprived (1 mL of H2O a day) will not grow very well due to a lack of water which is important in photosynthesis and also lacks nutrients. The seeds may also die off due to a lack of water. 2. The seeds that are have a proper amount of water (10 mL of
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and it was due to me neglecting the water level. All of the other fish in both batches survived. 6. Study the data you collected. Describe the occurrences of ammonia‚ nitrite‚ and nitrate in your tank. I cycled the tank during weeks 3 to 7. First‚ there was ammonia‚ then nitrite‚ and then nitrate. Currently‚ the ammonia and nitrite levels of my tank are 0. 7. Study the data you collected. Why is the population in
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DOI 10.1007/s11051-008-9428-6 BRIEF COMMUNICATION Synthesis and antibacterial activity of silver nanoparticles with different sizes ´ ´ ˜´ ˜ G. A. Martınez-Castanon Æ N. Nino-Martınez Æ ´ ´ F. Martınez-Gutierrez Æ J. R. Martınez-Mendoza Æ Facundo Ruiz Received: 29 January 2008 / Accepted: 22 May 2008 / Published online: 2 July 2008 Ó Springer Science+Business Media B.V. 2008 Abstract Silver nanoparticles with different sizes (7‚ 29‚ and 89 nm mean values) were synthesized using gallic
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Experiment 3: Enthalpy of Various Reactions Introduction A coffee cup calorimeter is an apparatus that is used to measure the quantity of thermal energy gained or lost in a chemical reaction. This experiment utilizes this apparatus‚ which is made from two styrofoam cups with plastic lids and a thermometer‚ to measure changes in thermal energy of various reactions. When using this type of apparatus‚ it is assumed that no heat is transferred between the calorimeter and the surroundings‚ and that
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The Silver Spring Monkey Case which involves the mistreatment of monkeys in The Institute for Behavioral Research started People for the Ethical Treatment of Animals (PETA) turned out to be one of the biggest‚ most profitable‚ and fast growing animal rights groups. PETA and its founder Alex Pacheco attracted the public’s attention with the Silver Spring Monkey Case and the reaction of the public and other animal right’s associations started an animal rights revolution. Alex Pacheco was cofounder
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Maggie Mitchell IB Chemistry Prd. 5 THE HALOGENS LAB Date: 9/11/13 Purpose: The purpose of this experiment was to observe and record the halogens’ (NaF‚ NaCl‚ NaBr‚ and KI) reactions with the chemicals Ca(NO3)2‚ AgNO3‚ and NH4OH and use these observations to identify an unknown halogen. Data: (see next page) TABLE 1: REACTIONS OF HALOGENS WITH CA(NO3)2‚ AGNO3‚ AND NH4OH REACTION NAF NACL NABR KI REACTION W/ CA(NO3)2 solution turns cloudy and precipitate forms clear precipitate
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Sodium Hypochlorite. Observe & add 1 drop of hydrochloric acid. 6. Potassium iodide + Lead Nitrate. A precipitate should form. 7. Sodium hydroxide + phenolphthalein. a. Phenolphthalein is an acid-base indicator. 8. Hydrochloric acid + phenolphthalein. a. What color would be expected when combining phenolphthalein with an acid or with a base? 9. Sodium bicarbonate + Silver nitrate 10. Silver nitrate + Ammonia a. Using a paper towel‚ absorb the mixture onto a paper towel and hold in front
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