II PUC – CHEMISTRY (34) MODEL QUESTION PAPER - 1 Time: 3hours 15 minutes Maximum marks: 70 Instructions: 1. The question paper has four parts: A‚ B‚ C and D. All parts are compulsory. 2. Write balanced chemical equations and draw labeled diagrams wherever required. 3. Use log tables and the simple calculator if necessary. (Use of scientific calculators is not allowed) PART-A I. Answer ALL of the following. (Each question carries 1 mark) 10x1=10 (Answer each question in one word or
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Section U21 October 26‚ 2011 X_______________________ Abstract Section The concept of this experiment was to analyze the enzyme Amylase and its environmental behavior. Amylase breaks down the biological macromolecule‚ carbohydrates‚ specifically starch into condensed subunits categorized as monosaccharaides or disaccharides. Two types of variables were human and fungal Amylase. Sum of six trials for both variables were conducted with two minutes intervals was measured for the duration. After every
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Unknown #1 Vomit Serratia marcescens & Bacillus cereus Biol 251 Microbiology 5/14/2009 Introduction The purpose of this study is to differentiate and identify two unknown organisms provided by the instructor in a nutrient broth. It is only known that the two organisms are from vomit; one is gram-positive and the other is gram-negative. It is necessary to first separate the two organisms by inoculating a nutrient agar plate using the streak-plate method. The
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Molisch Test Color of Junction Glucose Purple Sucrose Purple Starch Purple C. Bial’s Test Color Change Ribose Yellow -> Dirty Green Glucose Yellow -> Dark Yellow D. Seliwanoff’s Test Observation Sucrose 1st (Dark) Glucose 2nd (Medium) Fructose 3rd (Light) E. Benedict’s Test Color Change Glucose light blue -> Orange Fructose light blue -> light olive green Maltose light blue -> yellow brown Sucrose light blue -> blue green Starch light blue -> no change Distilled Water light blue -> no change
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cells and lower the activation energy of a reaction. Amylase is the enzyme which catalyses starch hydrolysis. Alpha amylase and beta amylase are two types of amylase enzymes. The amylase which is the most commonly found in the human body is the alpha amylase. Beta amylase is mainly found in bacteria‚ fungi and plants. Amylase breakdown starch into maltose. During the process of hydrolysis‚ Amylase degrades starch by splitting the long glucose units into smaller intermediates and finally producing a complex
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Introduction: Being able to identify a particular bacterial species is important. It is very useful in knowing its risk of toxicity to humans or animals‚ its resistance or susceptibility to antibiotics‚ and determining how to control its growth or kill it altogether. The purpose of these procedures is to discovery the identity of an unknown microbe by observing its reactions to a barrage of chemical and physical tests. Different microorganisms react in different ways‚ due to their function‚ digestibility
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|Observations of the Reaction| A.|NaHCO3 + HCl|1 |clear bubbles formed| B.|HCl + BTB|2 |turned orange after BTB was added‚ transparent‚ acidic| C.|NH3 + BTB|3 |turned dark blue after BTB was added‚ opaque‚ basic| D.|HCl + blue dye| |blue dye was missing from kit| E.|Blue dye + NaOCl| |blue dye was missing from kit| | with the 1 drop of HCl| || F.|NaOCl + KI|4 |small white precipitate‚ color changed to black after starch was added | | with 1 drop of starch| || G.|KI + Pb(NO3)2|5 |turned bright
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Determination of the Rate Constant for a Chemical Reaction Department of Chemistry Abstract This experiment was performed to determine the rate constant k‚ for hydrolysis of tertiary butyl chloride to tertiary butanol. The solvent system for this reaction is 45% isopropyl alcohol and 55% water. The rate of hydrolysis of t-butyl chloride is measured by the decrease in the concentration of this reagent with time. The rate of decomposition of t-butyl chloride must be equal to the rate of formation
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This document consists of 25 printed pages. [Turn over © A.P 9700/02/REV/2014 jfkhan04@gmail.com June 2006 Paper 2 5 Some bacteria that are found in soils contain the enzyme urease. For Examiner’s Use Urease catalyses the hydrolysis of urea to form ammonia and carbon dioxide: urea + water carbon dioxide + ammonia Some fertilisers added to soils to help crop growth contain urea. Although some crop plants can absorb ammonium ions‚ most obtain their source of nitrogen
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................................................................. - 6 Treatment of Experimental Data .......................................................................................... - 11 EXPERIMENTS: A - Kinetics of the Acid Catalyzed Hydrolysis of Methyl Acetate .......................................... 13 D - Determination of the Viscosity and Related Properties of Gaseous N2 and CO2 ............ 18 M - Determination of the Validity of the Beer-Lambert Law ..........................
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