electric water bath OR hot plate) * 250 cm3 beaker * boiling tube * anti- bumping granules * forceps * test tube holder * white tile * leaf to be tested (hibiscus leaves are excellent) * 90% ethanol * iodine/potassium iodide solution PROCEDURE: The video above shows the steps in Testing a Leaf for the Presence of Starch. The Procedure outlined below is slightly different. 1. Remove a green leaf fom a plant that has been exposed to sunlight for a few hours
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average rate of disappearance of A between 10 s and 20 s is __________ mol/s. A) 1.1 ˛ 10-3 B) 4.4 ˛ 10-3 C) 454 D) 9.90 ˛ 10-3 E) 2.2 ˛ 10-3 The peroxydisulfate ion (S2O82-) reacts with the iodide ion in aqueous solution via the reaction: S2O82- (aq) + 3I - ¬ 2SO4 (aq) + I3- (aq) An aqueous solution containing 0.050 M of S2O82- ion and 0.072 M of I- is prepared‚ and the progress of the reaction followed by measuring [I- ]. The data obtained is given in the table below. Time (s) [I- ] (M) 0 400
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The thyroid gland • • • • • anatomic considerations Formation and secretion of thyroid hormones Transport and metabolism of thyroid hormones Effects of thyroid hormones Regulation of thyroid secretion introduction: the thyroid gland • The thyroid gland maintains the level of metabolism in the tissues that is optimal for their normal function. • Thyroid hormones stimulate the O2 consumption of most of the cells in the body • Thyroid hormones help regulate lipid and carbohydrate metabolism • Thyroid
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Asymmetric Catalysis in Intramolecular Reactions of α-Diazoketones. Abstract: Carbon-hydrogen insertion reactions involve the insertion of a carbene‚ a neutral carbon atom or molecule with two unpaired valence electrons‚ into an unactivated carbon-hydrogen bond. This reaction produces many commercially valuable compounds. The reaction itself involves the use of diazocarbonyl compounds which contain an N2 ligand on a carbon alpha to a carbonyl. The reaction is thermodynamically favourable as it involves
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Class X Question 1: Chapter 1 – Chemical Reactions and Equations Science Why should a magnesium ribbon be cleaned before burning in air? Answer Magnesium is very reactive metal. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question
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CAL Biology Practical 2 – Identification of Biochemicals in Pure Form Name :……………………………………………………………. MARK: Class :……………………………………………………………. PRACTICAL 2: IDENTIFICATION OF BIOCHEMICALS IN PURE FORM CAUTION: Any heating that has to be done in the following tests should be carried out in a water bath at the boiling point of water. Direct heating of test-tubes should not take place. Introduction Biochemical Tests Qualitative - present/ absent Semi-quantitative - present in >/<
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SYLLABUS CHEMISTRY (043) CLASS-XII – (2012-13) Annexure - ‘ I ’ S.No. 1. 2. 3. 4. Type of Question Long Answers (LA) Short Answers-II (SA II) Short Answers-I (SA-I) Very Short Answer (VSA) Total Marks for No. of Total Marks each Question Questions 5 3 2 1 3 9 10 08 30 15 27 20 08 70 Weightage 4 5 5 5 4 3 8 5 3 4 4 6 4 4 3 3 70 Total: S.No. UNIT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Solid State Solutions Electrochemistry Chemical Kinetics Surface Chemistry General Principles
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BIOLOGY 114 MOLECULAR AND CELL BIOLOGY PRACTICAL MANUAL DEPARTMENT OF MICROBIAL‚ BIOCHEMICAL AND FOOD BIOTECHNOLOGY FACULTY OF NATURAL AND AGRICULTURAL SCIENCES UNIVERSITY OF THE FREE STATE 2012 Lecturers Prof. E. van Heerden Room 8 Department of Microbial‚ Biochemical and Food Biotechnology Prof. J. Albertyn Room 51 Department of Microbial‚ Biochemical and Food Biotechnology Practical time table Week Week begin Tutorial Tutoriaal Prac. and lecturer Prak
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Graduated cylinders (10&25mL) Lead nitrate solution Potassium iodide solution Balance Procedures: 1. Measure 18 ml of potassium iodide solution using the 25 ml graduated cylinder. 2. Pour the solution into the Erlenmeyer flask.
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Introduction: This experiment was used to examine the hypothesis that: Osmosis is dependent on the concentrations of the substances involved. Diffusion is the passage of solute molecules from an area of high concentration to an area of low concentration (Campbell & Reece‚ 2005). An example is ammonia diffusing throughout a room. A solute is one of two components in a chemical solution. The solute is the substance dissolved in the solution. The solvent‚ the other component‚ is any liquid in
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