ST ANDREW’S JUNIOR COLLEGE JC 2 Preliminary Examination CHEMISTRY 9647/03 Higher 2 13 September 2010 Paper 3 Free Response 2 hours Candidates answer on separate paper. Additional Materials: Answer paper‚ Graph Paper‚ Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and civics group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚
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Effects of Enzyme Catalysis of H2O2 by Catalase Report by: Timmy Lin (#269164729) October 17‚ 2011 Mr. Rienzi AP Biology Problem: Measuring the effects of Catalase enzymes on hydrogen peroxide decomposition. Measuring the rate of the reaction when hydrogen peroxide and Catalase are mixed at the same ratio for different time (10‚ 20 30 60 120 180 360 seconds). Background: Enzymes are biological catalysts that carry out cellular metabolic processes with the ability to enhance the rate
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+ O2-----> 2MgO | 2. Bubbling and fizzing occurs; the zinc appears to “dissolve” and what appears to be “steam” comes off out of container. | single-displacement reaction | Zn + 2 HCl (aq) --> ZnCl2(aq) + H2(g) | 3. Black smoke occurs | decomposition reactions | 2 (H2O2)(aq) MnO2 2 (H2O) + (O2) | 4. reddish-brown deposit on the surface of iron; surface of the iron is found corroded; the blue solution turns light green | single-displacement reaction | Fe + CuSO4(aq) --> FeSO4
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Cu Metal Recycling Lab Mr. Nelson – Chemistry Purpose: The purpose of this lab is to carry out an extensive series of reactions based on the element copper. These reactions include; synthesis‚ decomposition‚ single and double replacement. In this experiment‚ recycling will also be introduced. Procedure: See attached Story board. Data and Observations and Data Analysis: Step Word Equation 1 Balanced Chemical Equation Type of Reaction Observations Copper + nitric Cu + 4HNO3
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On September 10th‚ 2017 a series of 10 dead piglets were put out in the morning. We then observed these piglets for the next 15 days to see how they would progress. We had a series of question like which piglet decomposed faster‚ how do flies find dead bodies and how the secession of insects were on the bodies that were hanging and on the ground. First‚ one of the questions was on if the piglet in the natural state‚ the burnt one or the buried one would decompose faster. Originally I thought that
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6‚138.27 59‚540‚560 .17 Weighted Moving Average (3 period; .6‚ .3‚ .1) -- 424.81 6‚501.58 61‚107‚180 .18 Exponential smoothing (alpha = 0.5) -- 794.28 5‚880.56 50‚755‚960 .16 Trend Analysis .54 0.00 4‚355.70 31‚285‚700 .12 Seasonal Additive Decomposition .97 0.00 1‚251.26 2‚386‚650 .03 It is obvious that the superior
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service. Unfortunately many of these services are not only taken for granted‚ but are actually being subjected to harmful effects by the human species. One service that is being subjected to decline by human influence is the detoxification and decomposition of waste products. The ability of ecosystems to maintain biodiversity is also subject to this decline. Sunlight contains three divisions of ultraviolet radiation; UVA‚ UVB‚ and UVC (which does not reach the Earth’s surface). The lower stratosphere
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Health-care waste management in India is receiving greater attention due to recent regulations (the Biomedical Wastes (Management & Handling) Rules‚ 1998). The prevailing situation is analyzed covering various issues like quantities and proportion of different constituents of wastes‚ handling‚ treatment and disposal methods in various health-care units (HCUs). The waste generation rate ranges between 0•5 and 2•0 kg per bed per day. It is estimated that annually about 0•33 million tonne of waste are
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has been introduced as a replacement polymer for petroleum. Biopol is made from a biological substance which is a microorganism known as Alcaligenes eutrophus. Properties; Biopol is stable when stored in air and even in humid conditions. The decomposition into carbon dioxide and water will only occur when they expose the polymer to microorganisms found in soil‚ sewage‚ river bottoms and other similar environments. Other properties include; * Insoluble in water * Good oxygen permeability
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Powdered limestone + high temperature+ sand+ sodium carbonate= glass powdered limestone + powdered clay + heat= cement cement powder + water + sand +gravel= concrete Limestone + strong heating= quicklime (calcium oxide) + carbon dioxide (thermal decomposition) To make lots of quicklime we use a lime kiln 1) fill the kiln with crushed limestone 2) heat it strongly with a supply of hot air quicklime comes out of the bottom of the kiln‚ waste gases leave at the top. Usually the kiln rotates to ensure that
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