hydrocarbon C4H10 (A) on monochlorination gives a compound C4H9C1 (B). Compound (B) on treatment with sodium metal gives 2‚2 ‚3‚3- tetramethylbutane. What are the structural formulas of (A) and (B)? 8. a) A hydrocarbon of formula C6H12 decolorises bromine solution‚ dissolves in concentrated sulphuric acid‚ yields 2-methylpentane on hydrogenation and on ozonolysis gives formaldehyde and 3- methylbutanal. What is the
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(100) Convert each of the following. (Chapter 3) a. 4.72 g to mgHint b. 2.7 × 103 cm/s to km/hHint c. 4.4 mm to dmHint (101) How many protons‚ electrons‚ and neutrons are in each isotope? (Chapter 4) a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123 (102) Write the complete electron configuration for each atom. (Chapter 5) a. fluorine b. lithium c. rubidium (103) Why do the elements magnesium and barium have similar chemical and physical properties? (Chapter 6) (104)
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B) C3 H6 C) C4 H10 D) C5 H12 3. Which pair of terms correctly describes the reaction between ethane and water? I Hydrogenation II hydration III addition IV substitution 4. A substance with a pleasant smell that undergoes hydrolysis to form an alcohol as one of the products is likely to be: a) sodium ethanoate b) ethanoic acid c) ethanol d) butyl ethanoate 5. The
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NSS Chemistry Part 15 Analytical Chemistry (Structural Questions) HKCEE and HKAL Past Paper Questions 1. HKCEE 1994 Q8b A student carried out some tests on an ionic compound X which was a white solid. The results obtained were summarized in the following flow diagram: (i) Based on the above information‚ deduce the cation and anion present in X. (ii) Describe how the flame test on X can be carried out in the laboratory. (6 marks) 1 2. HKCEE 1995 Q2 In each of the following
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column are more similar than elements in the same horizontal row. Seventy five percent of the table is made up of metals‚ and a couple of the columns on the right of the table have gases. There are only two elements that are liquids- mercury and bromine. Column 1 contains the alkali metals‚ which suddenly combust when exposed to air or water. Columns 3-12 are the transition metals‚ which contain heavier atoms‚ which are more flexible in how they organize their electrons. Column 17 is made up of the
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permanganate to the solution that changed color in the previous step. Record how many drops were added until the purple color of the ion no longer changed. 6. Observe color changes when sodium iodide solution is reacted with chlorine water and bromine water (separately). 7. Observe color changes when sodium bromide solution is reacted with chlorine water and iodine solution (separately). 8. Observe what happens when 3M sulfuric acid and potassium permanganate are added to hydrogen peroxide
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electron structure/ are the same element/ have the same atomic number/ are isotopes. (Do not accept Y and Z have same no. of e－ in outermost shell) 1 1994 - 7(b) Marking Scheme (i) Bromine exists as simple molecules with weak intermolecular attraction/ weak van der Waal’s force. ∴ it has low b.p. (Do not accept bromine has weak covalent bond.) In Lead(II) bromide‚ the attraction between ions is strong/ ionic bond/PbBr2 has strong electrostatic attraction. ∴ it has higher a m.p. (Do NOT accept lead(II)
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1) tetrarsenic decoxide 2) bromine trioxide 3) boron nitride 4) dinitrogen trioxide 5) nitrogen triiodide 6) sulfur hexafluoride 7) xenon tetrafluoride 8) phosphorous trichloride 9) carbon monoxide 10) phosphorous pentachloride 11) diphosphorous pentoxide 12) disulfur dichloride 13)
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flow allows them to conform to the shape of their containers. Figure 13.5 Both liquids and gases can flow. The liquid on the left is colored water. The gas on the right is bromine vapor. If a gas is denser than air‚ it can be poured from one container into another. These pictures were taken in a fume hood because bromine is both toxic and corrosive. 2. Figure 13.6a eventually moves into the air. The conversion of a liquid to a gas or vapor is called vaporization. When such a conversion occurs
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planet 6. Atomic mass unit—also known as Dalton (symbol: Da) standard unit for measuring or indicating mass on an atomic or molecular scale. 5. Complete the following table: Isotope Atomic No. Mass No. No. of Protons No. of Neutrons No. of Electrons Bromine-81 35 81 35 45 35 Boron-11 5 10.811 5 6 5 Cl 17 35.4527 17 18 17 52Cr 24 52 24 28 24 Ni-60 58 58.6934 28 31 28 Sr-90 38 87.62 38 50 38 Lead-206 82 207.2 82 125 82 6. Explain how ozone is formed in the troposphere. Ozone production
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