Equipment Required: -4 Test tubes -Dropper - Cyclohexane (C6H12) (3ml) - Cyclohexene (C6H10) (3ml) - Toluene (CH3C6H5) (3ml) - Potassium Permanganate solution (KMnO4) .01 mol L-1 (4ml) - Sulfuric Acid (H2SO4) 2mol L-1 (2ml) - Bromine Water (Br2) (5ml) Procedure: Reaction of hydrocarbons with acidified permanganate: 1) Into three separate‚ labeled test tubes place 1 ml of cyclohexane‚ cyclohexene and toluene respectively. 2) In a separate test tube add 4 ml of 0.01mol L-1 KMnO4
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Calculations 1. Rounding Examples *0.1356 (4 significant figures) -> Round answer to 2 significant figures *0.1356 -> 0.14 *314.705 (6 significant figures) -> Round number to 4 significant figures. *314.705 -> 314.7 *0.0035771 (5 significant figures) -> Round to 3 significant figures. *0.0035771 -> 0.00358 *500‚000 (1 significant figure) -> Write this number to have 3 significant figures. *500‚000 - 5.00 x 10^5 *39.501 -> Round to 2 significant figures. *39‚501
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Experiment 7 Gooch filter crucible or fritted-glass funnel Mother liquor- liquid from which a substance precipitates or crystallizes Filtrate- liquid that passes through the filter Slurry- suspension of solid in liquid Calcium ion can be analyzed by precipitation with oxalate in basic solution to form CaC2O4.H2O The precipitate is soluble in acidic solution because the oxalate anion is a weak base CaC2O4.H2O (calcium oxalate monohydrate ; MW = 146 g/mol) Equation: Ca2+(aq) + C2O42-(aq)
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atom‚ there are __________ paired and __________ unpaired electrons. A) 4‚ 2 B) 0‚ 5 C) 2‚ 5 D) 6‚ 1 E) 4‚1 2. Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br A) Sr B) Br C) Sr‚ O‚ Se D) Na E) O‚ Se 3. The electron configuration of the S2- ion is __________. A) [Ne]3s23p2 B) [Ne]3s23p6 C) [Kr]3s22p-6 D) [Ar]3s23p2 E) [Ar]3s23p6 4. The ion NO- has __________ valence electrons. A) 10 B) 16 C) 12
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XI (Science) has completed the chemistry investigatory project entitled The Study of the Acidity of Different Samples of Tea Leaves and the Reasons for the Variation in their Taste as a partial fulfillment of course curriculum under the supervision of Mrs. Mamta Agarwal. This is a bonafide work prepared by herself. Signature of Internal Examiner ACKNOWLEDGEMENT I bonafied CBSE for giving us such an opportunity to make this project. I would like to thank each and
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density of the object. a. 7.50 g/mL b. 9.25 g/mL c. 5.70 g/mL d. 264.5 g/mL e. None of the above. SHOW WORK HERE: D= 163.0/28.6 D=5.7 Page 2 __c___ 4. Of the following substances‚ the least dense is that of (HINT: estimate or calculate the density of the choices)? a. 1000 g of water at 4 oC b. 100.0 cm3 of chloroform‚ which weighs 148.9 g c. a 10.0 cm3 piece of wood weighing 7.72 g d. an ethyl alcohol ‑ water mixture of density 0.83 g/mL. __a___ 5. The
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carbon atoms. (ii) Name the type of reaction involved in cracking. (iii) Write an equation for one possible cracking reaction of the alkane C16H34 when the products include ethene and propene in the molar ratio 2:1 and only one other compound. (4) (Total 6 marks) 2. A compound of carbon‚ hydrogen and nitrogen contains 61.0% of carbon and 15.3% of hydrogen by mass. (i) Calculate the empirical formula of the compound. (ii) What other piece of data is required to deduce the molecular formula
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biological effects have frequencies of __________ Hz. A) 100-10‚000 B) 1-1000 C) 10-5 -10-9 3) D) 10-3 -10-5 E) 400-700 4) In the Bohr model of the atom‚ __________. A) electron paths are controlled by probability B) electrons travel in circular paths called orbitals C) electrons can have any energy D) electron energies are quantized E) both A and C 4) 5) According to the Heisenberg Uncertainty Principle‚ it is impossible to know precisely both the position and the __________
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Stoichiometry • Calculations involving quantities of consumed reactants and formed products based on a BALANCED chemical equation. Mass Molar Mass Mole Coeff Bal Eqn Mole Molar Mass Mass Example 2 • The Haber Process involves reacting gaseous nitrogen and gaseous hydrogen to form ammonia. Determine the mass in grams of hydrogen gas required to form 1.00 x 103 g ammonia. Your Turn 2 • If you react 52.9 g of potassium chlorate (KClO3) with excess phosphorus
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CELL STRUCTURE CELL THEORY: Structural and functional unit of all living things New cells arise from already existing cells Cells contain information that instructs growth. This information can be passed onto new cells. MICROSCOPES: There are two main types of microscopes: Light and Electron Electron Micrographs- shown in colour LIGHT ELECTRON Uses beam of light Magnification = x1500 Resolution = 200 nm Wide range of specimens can be used Samples are fairly quick + easy to prepare
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