Date: 28/11/13 EVALUATION OF THE EFFECT OF SODIUM CHLORIDE ON ONION EPIDERMAL CELLS INRODUCTION A living plant cell will shrinks or swells depending on the solute concentration of the cell in relation to the solute concentration of the fluid surrounding the cell (1). It follows that water will move from a region of high water concentration to a region of low water concentration therefore‚ if a cell is placed in a hypertonic solution water will move from the cell into the solution until the
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or salt‚ is a better conductor of electricity? Explain your answer. Salt‚ because it’s an ionic compound (there isn’t a real bond‚ but a charge separation e.g. NaCl in reality is Na+ Cl-) Part One: Substance: Observations: NaCl Sodium Chloride The substance did not do anything. It was unaffected by the heat. C12H22O11 Sucrose The substance melted in the pan. Part Two: Substance: Observations: Sugar Solution The sugar solution heated up with the electricity. Salt
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CHLORINE Chlorine is an element I would like to present today. It is discovered in 1774 by Carl Wilhelm Scheele and was named by Sir Humphry Davy in 1810‚ after a Greek word‚ khlôros‚ which means greenish yellow. Chlorine is in the halogen group in the periodic table with an atomic number of seventeen. Pure chlorine is yellowish-green but most common compounds with chlorine are typically colourless. The element itself was first produced in 1774 by Carl Wilhelm Scheele‚ by heating hydrochloric acid
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Mass as a Means of Counting Purpose: Determine the number of atoms that fit on one tea spoon. 1. Use one clean and dry 50 mL beaker. Place on a balance and press the zero button until the display shows 0.00. 2. Place one level teaspoon of sodium chloride (NaCl) into the beaker‚ determine the mass and record in the table (row 1). 3. Repeat steps 1-2 for CaCO3 4. Repeat steps 1-2 for H2O 5. Use a clean and dry evaporating dish instead of a beaker to repeat steps 1-2 for ethanol C2H6O 6. Complete the
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regiochemistry of the reaction. B. Chemical Properties: acetyl chloride CAS #75-36-5 Appearance: colourless to light yellow liquid with a pungent and choking odour Melting point: -112 C Boiling point: 51 C Vapour density: 2.7 Vapour pressure: 315 mbar at 20 C Density (g cm-3): 1.104 Flash point: 4 C (closed cup) Explosion limits: 7.3% - 19% Autoignition temperature: 390 C Water solubility: decomposes aluminum chloride CAS #7446-70-0 Physical State: Crystalline powder Color: yellow
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Road salt‚ also called rock salt‚ is sodium chloride‚ chemically combined with NaCl. Na is the chemical abbreviation for sodium and Cl is the abbreviation for chloride. Table salt that we use is exactly the same chemical. The US Environmental Protection Agency has set limits on allowable levels of chloride in water but not sodium. In high concentrations both sodium and chloride can be harmful to aquatic organisms. Sodium is the primary concern for humans‚ as it can be harmful to people with high
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SUMMATIVE ASSESSMENT –I (2011) Lakdfyr ijh{kk&I SCIENCE / foKku Class – IX / & IX Time allowed: 3 hours fu/kkZfjr le; % 3 ?k.Vs 470011 Maximum Marks: 90 vf/kdre vad % 90 General Instructions: (i) The question paper comprises of two sections‚ A and B. You are to attempt both the sections. (ii) All questions are compulsory. (iii) There is no overall choice. However‚ internal choice has been provided in all the five questions of five marks category. Only one option in such
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Chemistry 2283g Experiment 1 – Alkyl Halides EXPERIMENT 1: Preparation and Reactivity of Alkyl Halides Relevant Sections in the text (Wade‚ 7 ed.) • 6.7 (p. 228) Reactions of alkyl halides • 6.8 – 6.12 (p. 229 – 242) The SN2 reaction: generality‚ factors affecting SN2 reactions‚ substrate reactivity‚ mechanism • 6.13 – 6.14 (p. 243 – 249) The SN1 reaction: mechanism‚ stereochemistry General Concepts The most common of the variety of methods available for preparing alkyl halides is the replacement
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HKDSE Chemistry – A Modern View 1 (SAMPLE) Suggested Answers (Coursebook) |Chapter 1 The fundamentals of chemistry | |Class Practice |1 | |Chapter Exercises |3 | |Chapter 2 The atmosphere
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sulphite copper(I) oxide PbO2 iron(III) sulphate Q1 (Total 6 marks) Formula of compound 2 *N36637A0220* Leave blank 2. Complete the following statements by inserting the missing colours. (a) When water is added to anhydrous cobalt chloride‚ it turns ............................................... . (1) (b) When iodine is heated‚ it forms a
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