Chemical Separation Introduction: The objective of this experiment was to extract the pigments from spinach leaves‚ perform Thin Layer Chromatography (TLC) on the spinach leaf extract‚ and then determine the best solvent mixture to use to separate the pigments in the extract. The pigments are located inside the chloroplast walls in the cells of the spinach leaves. In order to obtain the pigments the cell walls must be broken down thus exposing the pigment containing chloroplasts. Upon
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Classes of Chemical Reactions Whenever a reaction takes place‚ energy is changed as well when the substances react chemically. Scientists have taken these changes in energy and generalized them. Scientists can take these generalizations and discover more about the nature and tendencies of matter. In this lab‚ the purpose was to perform seven reactions‚ write down their equations‚ and identify the type of reaction. In this lab report‚ several methods of displaying this information will be applied
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Balancing Chemical Equations Answer Key Vocabulary: coefficient‚ combination‚ compound‚ decomposition‚ double replacement‚ element‚ molecule‚ product‚ reactant‚ single replacement‚ subscript Prior Knowledge Questions (Do these BEFORE using the Gizmo.) [Note: The purpose of these questions is to activate prior knowledge and get students thinking. Students are not expected to know the answers to the Prior Knowledge Questions.] The scouts are making s’mores out of toasted marshmallows‚ chocolate
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Results I did each test 4 times. This is the average of all the tests. 0‚20‚40‚60‚80 are all in Celsius. Lemon juice+baking soda: 0-15mL; 20-23mL; 40-30mL; 60-33mL; 80-40mL. Vinegar+Ammonia(results in Celsius): 0-3; 20-23; 40-43; 60-63; 80-82 HCl+NaOH(results in Celsius): 0-44; 20-53; 40-64; 60-72; 80-90 Conclusions/Discussion For the lemon juice + baking soda experiment‚ as the temperature went higher‚ more gas was produced. The vinegar + ammonia experiment was a very weak exothermic
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Biological Membrane Study: HCl‚ NaOH‚ SDS Objective and Hypothesis: The objective of this lab is to determine the effects of SDS‚ HCl‚ and NaOH on red cabbage cell membrane. Prior knowledge can tell us that the red cabbage is a red-purple color due to a pigment called anthocyanin. This is what we will be testing in the experiment. We also know that HCl is a strong acid (very low pH) and that NaOH is a strong base (very high pH). From information learned in this course (lecture/lab) we can assume that both
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Classifying Chemical Reactions Introduction Pre-lab questions 1. Which reactants used in this experiment are flammable? Discuss the safety precautions that are necessary when working with flammable materials in the lab? 2. Summarize the following description of a chemical reaction in the form of a balanced chemical equation? 3. Common observations of a chemical reaction are described in the introduction section. For each observation‚ name a common or everyday occurrence that must involve a chemical reaction
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Which of these are the main sources of regulations governing financial reporting in Australia? A) The Corporations Act‚ The AASB‚ CLERP B) Accounting standards‚ conceptual framework‚ stock exchange listing rules C) Government legislation‚ stock exchange listing rules‚ accounting standards D) AASB‚ FRC‚ government legislation. If there is a conflict between the provisions of the Framework and the requirements of the accounting standards A) The statements of accounting concepts prevail B) The
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Year 1 / Semester 1 Notes:School of Engineering August 2014 Intake Dr. Abdulkareem Sh. Mahdi Engineering Mathematics 1 (MTH60103) Differentiation – part i 1 September 6‚ 2014 2 Learning outcomes At the end of this lecture‚ you should be able to: (1) Evaluate the limits of functions; (2) Differentiate using the FIRST PRINCIPLES; (3) Differentiate using the standard formulae (4) Differentiate using the rules of Dr. Abdulkareem Sh. Mahdi September 6‚ 2014
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Chemical Formulas Review: Nomenclature and Formula Writing Naming Simple Compounds There are four naming systems you should familiarize yourself with to succeed on the SAT II Chemistry exam. The trick is recognizing which naming system to use. Here are the guidelines: * If the compound starts with H‚ it is an acid. Use the naming acids rules. * If the compound starts with C and contains quite a few H’s and perhaps some O’s‚ it is organic. Use the naming organic compounds rules. *
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Purpose: To find out the percent yield of copper in the reaction between copper sulfate (CuSO4) and Iron (Fe). Materials: Balance 100-mL beaker 250-mL beaker Bunsen burner Copper sulfate crystals Glass stirring rod 100-mL graduated cylinder Iron filings Ring stand and ring Wire gauze Procedure: 1. Record mass of clean 100-mL beaker. 2. Add 8.0 grams of copper sulfate crystals to beaker. 3. Add 50.0 milliliters of distilled water to the crystals. 4. Put wire gauze on ring on ring
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