Class: F.3 ( ) Baptist Lui Ming Choi Secondary School Final Examination (2013-2014) Date: 19/ 06/ 2014 ame: Form 3 Chemistry Time: 8:40-9:50a.m.(70min) Total number of pages: 10 Answer ALL the questions. For Section A, choose the best option and write the correct answer on the multiple choice answer sheet. For other sections, write the correct answers on the answer sheets provided. Section A: Multiple Choice (30%) 1. Chlorine is a chemical with strong oxidizing power. Which of the following are the correct hazard warning labels of a bottle of chlorine gas? I. II. III. IV. A. I and II only. B. II and III only C. I and III only D. II and IV only 2. Which of the following pair of apparatus are used to separate pure water out of seawater? I. II. III. IV. 100 80 60 40 20 A. I and II only. B. II and III only C. I and III only D. II and IV only 3. Which of the following is OT a chemical change? A. Heating calcium carbonate in air strongly. B. Putting a balloon of air into liquid nitrogen. C. Mixing hydrochloric acid and magnesium together. D. Adding sodium in water. P.T.O.
F.3 Final (13-14) Chemistry P. 2 4. Which of the following methods can be used to change clean air into liquid air? A. Cooling to -80 o C and then filtration B. Repeating cooling and compression to -200 o C C. Filtration and then cooling to -80 o C D. Bubbling air into limewater 5. Which of the following gases can be used to fill filament light bulb? A. itrogen B. Oxygen C. Argon D. Carbon dioxide 6. A liquid X is miscible with water and it boils at 65 o C. Which of the following methods is suitable to separate liquid X from the mixture of X and water? A. fractional distillation B. filtration C. electrolysis D. crystallization 7. Which of the following test tubes may contain a saturated solution? A. B. C. D. 8. Which of the following method can be used to separate pure sodium chloride from seawater? A. boiling followed by condensation B. sublimation followed by cooling C. filtration followed by distillation D. filtration followed by crystallization To be continued
F.3 Final (13-14) Chemistry P. 3 9. Which of the following statements about seawater are correct? (1) It is a solution of salts. (2) It is electrolyzed directly in chlor-alkali industry to give useful products. (3) It can be desalinated by reverse osmosis. A. (1) and (2) only. B. (1) and (3) only. C. (2) and (3) only. D. (1), (2) and (3). 10. Which of the following part of the Earth is mainly composed of iron? A. Atmosphere. B. Crust. C. Mantle. D. Core. 11. Which of the following is OT a use of sodium chloride? A. Making fertilizer B. Making brine C. Seasoning food D. Preserving fish 12. Which of the following combinations is correct? Ore Extraction method A. Bauxite Carbon reduction B. Haematite Carbon reduction C. Iron pyrite Electrolysis D. Calcite Electrolysis 13. Which of the following rocks is OT mainly made up of calcite? A. Granite B. Limestone C. Chalk D. Marble P.T.O.
F.3 Final (13-14) Chemistry P.4 14. Which of the following acid can be used to test the presence of potassium ions in a solid sample? A. dilute hydrochloric acid. B. dilute nitric acid. C. concentrated hydrochloric acid. D. concentrated nitric acid. 15. Which of the following are examples of physical weathering? (1) Limestone is broken down into piece by temperature change. (2) Marble is dissolved by acidic rainwater. (3) Granite is broken by freezing of rainwater in its crack. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 16. Which of the following is the result of erosion? A. It converts limestone into marble. B. It makes sedimentary rocks from sediment. C. It breaks rocks apart by temperature change. D. It makes sea cliff in coastal area. 17. Which of the following sub-atomic particles must be present in an atom of all elements? (1) Proton. (2) eutron. (3) Electron. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 137 18. Which of the following about the atomic structure of an element 56X is correct? o. of proton o. of neutron o. of electron A. 137 56 137 B. 56 137 56 C. 56 81 56 D. 81 137 56 To be continued
F.3 Final (13-14) Chemistry P. 5 19. The carbon-12 isotope has a relative atomic mass of 12.00. Which of the following is correct? A. The density of carbon is 1.2 g cm -3. B. Each atom of carbon weighs 12.0g. C. Atoms of carbon all contain 12 protons. D. It is chosen as a standard atom with 12.00 atomic mass units. 20. Which of the following particles are isotopes? Particle Atomic number o. of electron Mass number W 9 9 17 X 9 9 18 Y 8 10 16 Z 8 8 18 A. W and X B. Y and Z C. X and Z D. W and Z 21. X exists in two isotopic forms, 103 X and 105 X, with percentage abundance of 30.0% and 70.0% respectively. The relative atomic mass of X is A. 103.4 B. 104.4 C. 103.8 D. 104.0 22. Element Y has an isotope, 17 37 Y. Which of the following statements about Y is ICORRECT? A. Y belongs to group VII of the periodic table. B. The mass number of the isotope is 37. C. Y is a liquid at room temperature and pressure. D. Y exits in the form of diatomic molecule, Y 2 under room conditions. 23. Which of the following statement about Periodic Table is correct? A. Elements are arranged in an increasing order of mass number. B. The reactivity of element increases across a horizontal row on the table. C. The vertical columns are called families. D. Metals are found at the top left hand corner of the table. P.T.O.
F.3 Final (13-14) Chemistry P. 6 24. An atom of element X has 15 electrons. The atomic number of another element Y with similar chemical properties to X is? A. 5 B. 7 C. 20 D. 23 25. Which of the following about mercury are correct? (1) It is a shiny solid at room conditions. (2) It is a good conductor of electricity. (3) It expands as temperature increases. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 26. Which of the following pair of ions are isoelectronic? A. Mg 2+ and Cl -. B. Ca 2+ and O 2-. C. Li + and H +. D. Al 3+ and F -. 27. Z is an element of group III and period 4 and with atomic number 31. What is the electron arrangement of Z 3+? A. 2, 8, 18 B. 2, 8, 8, 3 C. 2, 8, 18, 3 D. 2, 8, 8 28. The formula of the compound formed between an alkali metal A and X is A 3 X. What is the formula of the compound formed between an alkaline earth metal B and X? A. BX B. B 3 X 2 C. BX 3 D. B 2 X 3 To be continued
F.3 Final (13-14) Chemistry P. 7 29. The atomic numbers of element A and B are 20 and 9 respectively. The electron diagram of the compound formed between A and B is A. B C. D. 30. Atoms X, Y and W form cation X +, anion Y - and W 2-. If X +, Y -, W 2- and neon atom are isoelectronic. The increasing order of atomic number of these atoms is A. W < Y < neon < X B. X < neon < Y < W C. Y < W < neon < X D. X < Y < neon < W Section B: Matching (5%) In the boxes provided, write the letters in column II that match with the numbers in column I. Column I Column II 1. itrogen A. It is an ore which can be used to produce copper 2. Dry cobalt chloride paper B. Its liquid is used to store things at a very low temperature. 3. Quartz C. He put elements in the Periodic Table of Elements 4. Bromine D. To test oxygen in the air 5. Mendeleev E. One of the minerals which made up granite F. A liquid non-metal which is toxic G. It is used to fill balloon H. It changes colour in the presence of water Section C: Fill in the blanks (15%) 1. The chemical formula and hazard warning label are displayed on a bottle of nitroglycerin, C 3 H 5 3 O 9 It means nitroglycerin is (a) and it is a compound, which is formed from carbon, (b), nitrogen and oxygen. 2. The gaseous layer of surrounding the Earth is called (c) which is made up of air. Air is a (d) of different gases. P.T.O.
F.3 Final (13-14) Chemistry P. 8 3. Pure water can be extracted from seawater by (e). Common salt can be separated from seawater by (f), however, other salts would be present beside common salt. 4. Granite is an example of (g) rock and it is mainly made up of (h), such as mica and feldspar. 5. The positively charged sub-atomic particle which can be found inside an atom is called (i) which its relative mass is equal to that of a (j). 6. Group II elements are also known as (k). (l) is the first member of the group II elements. 7. Burning magnesium in air gives a compound called (m) which is a/ an (n) compound, since it is made up of oppositely charged ions. Theses ions have great stability because they have a/ an (o) of electrons in their outermost shells. Section D: Structural Questions (50%) 1. a. The diagram below represents the particles in a gas sample. Ar H O H O O O O O O O C O i. ame all the substances shown that are elements. Suggest a physical method to separate the elements from gas sample. i ame all the substances shown that are compounds. iv. Given that the chemical formula of water is H 2 O. Write the formula of carbon dioxide. v. Suggest a use of carbon dioxide. (5 marks) b. In the industry, electrolysis of brine is used to produce important substances. i. What is the meaning of electrolysis? What is the smell of the colourless gas formed from electrolysis? i State one use of the colourless gas produced from electrolysis? iv. State the simple chemical test for the colourless gas. v. Suggest why seawater is OT used in the industrial electrolysis. (5 marks) To be continued
F.3 Final (13-14) Chemistry P. 9 2. a. Complete the following word equations: i. Silver oxide heat silver + copper oxide + carbon heat + carbon dioxide i electricit y Aluminium + oxygen iv. Calcium hydroxide + carbon dioxide + water v. Calcium carbonate + hydrochloric acid + carbon dioxide + water (5 marks) b. Limestone is a very useful raw material. Some of its uses are to make quicklime, slaked lime, limewater and to reduce the acidity of soil. i. State OE other use of limestone. What is the chemical name of quicklime? i Describe how do you prepare slaked lime from limestone. iv. When limestone is added to soil to reduce acidity, why is it powdered? (5 marks) 3. The diagram shows the arrangement of sub-atomic particles in an atom. a. For particle A,, in the atom, i. Write the name and symbol of particle A. What is its relative mass compare with particle C? (3 marks) b. For the atom in the diagram, i. What is the name of the atom? What is the mass number of the atom? i What is the notation (full symbol) for the atom? (3 marks) c. i. What is meant by the term isotope? The element has two naturally occuring isotopes only. Given that one of the isotopes has mass number equal to 6 and its percentage abundance is 7.3%. Calculate the relative atomic mass of the element (show your steps and correct your answer in 2 d.p.) (4 marks) P.T.O.
F.3 Final (13-14) Chemistry P. 10 4. a. Astatine, At, is a group VII element. It has been found in only small amount on the Earth. i. What is the family name of group VII elements? What is the physical state of astatine under room conditions? i Is it a conductor or a non-conductor of electricity? Explain. iv. Draw the electron diagram (outermost shell only) for an astatine atom. v. Which element, fluorine or astatine, will be more vigorously towards sodium? Why? (5 marks) b. Sodium reacts with water to give an ionic compound X and a colourless gas Y. i. What is compound X? State one observable change for the reaction. i Draw the electron diagram of a sodium ion. iv. Suggest a simple test, with expected observable change, to show the presence of sodium ion in compound X. (5 marks) 5. a. For the ionic compound formed from the reaction between i. potassium and oxygen calcium and chlorine 1. Write the chemical name 2. Write the formula 3. Draw the electron diagram (show outermost shell electrons only) (6 marks) b. You are given a mixture of sodium chloride solution and limestone. i. Draw a labeled diagram to show separation of limestone from the mixture. Describe how do you separate pure sodium chloride from sodium chloride solution. (4 marks) ***End of Paper***
Class: F.3 ( ) Baptist Lui Ming Choi Secondary School Final Examination (2013-2014) ame: Form 3 Chemistry Score: /100 Section A: Multiple Choice (30%) Mark the correct answer on the multiple choice answer sheet provided. Section B: Matching (5%) Column I 1 2 3 4 5 Column II Section C: Fill in the blanks (15%) 1. a. b. 2. c. d. 3. e. f. 4. g. h. 5. i. j. 6. k. l. 7. m. n. o. Section D: Structural Questions (50%) 1. a. i. i iv. v. P.T.O.
F.3 Final (13-14) Chemistry P. 2 1. b. i. i iv. v. 2. a. i. Silver oxide heat silver + (1%) Copper oxide + carbon heat + carbon dioxide (1%) i electricit y Aluminium + oxygen (1%) iv. Calcium hydroxide + carbon dioxide + water (1%) v. Calcium carbonate + hydrochloric acid + carbon dioxide + water (1%) b. i. i (2%) iv. To Be Continued
F.3 Final (13-14) Chemistry P. 3 3. a. i. (2%) b. i. i c. i. (2%) (2%) 4. a. i. i iv. v. (1%) P.T.O.
F.3 Final (13-14) Chemistry P. 4 4. b. i. i (1%) iv. (2%) 5. a. i. 1. (1%) 2. (1%) 3. (1%) 1. (1%) 2. (1%) 3. b. i. (1%) (2%) (2%) ***End of Paper***
Class: F.3 ( ) Baptist Lui Ming Choi Secondary School Final Examination (2013-2014) ame: Form 3 Chemistry Score: /100 Section A: Multiple Choice (30%) 1. D A B B C 6. A B D B D 11. A B A C B 16. D B C D A 21. B C D B C 26. D A B C A Section B: Matching (5%) Column I 1 2 3 4 5 Column II B H E F C Section C: Fill in the blanks (15%) 1. a. Explosive b. Hydrogen 2. c. Atmosphere d. Mixture 3. e. Distillation f. Evaporation 4. g. Igneous h. Minerals 5. i. Proton j. eutron 6. k. Alkaline earth metal(s) l. Beryllium 7. m. Magnesium oxide n. Ionic o. Octet Section D: Structural Questions (50%) 1. a. i. Oxygen, nitrogen and argon [1] Fractional distillation [1] i Water and carbon dioxide [1] iv. CO 2 [1] v. Making soft drink/ Fill fire extinguisher/ Using dry ice for cooling/ [1] P.T.O.
F.3 Final (13-14) Chemistry P. 2 1. b. i. Electrolysis means decomposition by electricity [1]. It is odourless [1]. i It can be used as a rocket fuel/ to fill balloon/ to make ammonia/ to make margarine/ to make hydrochloric acid/ [1] iv. It burns with a pop sound. [1] v. It is because seawater contains other salts that may affect the results of electrolysis [1]. 2. a. i. Silver oxide heat silver + oxygen [1] Copper oxide + carbon heat copper + carbon dioxide [1] i Aluminium oxide electricit y Aluminium + oxygen [1] iv. Calcium hydroxide + carbon dioxide calcium carbonate + water [1] v. Calcium carbonate + hydrochloric acid calcium chloride + carbon dioxide + water [1] 2. b. i. It can be used to make footpath/ building materials/ cement/ glass/ paper [1] Calcium oxide [1] i Heating limestone by Bunsen burner with non-luminous flame for about 15 minutes to form quicklime [1] Add a small amount of water to quicklime to form slaked lime [1]. iv. To increase the surface area of limestone for better reaction with acid in soil [1]. 3. a. i. Electron and e - [1+1] 0 (or 1/1840) [1] b. i. Lithium [1] 7 [1] i 7 3Li [1]. c. i. Isotopes are atoms of a particular element [1] which have the same number of proton (atomic number) but different number of neutron (mass number). [1] 7.3/ 100 x 6 + 92.7/ 100 x 7 = 6.93 [1M + 1A] To Be Continued
F.3 Final (13-14) Chemistry P. 3 4. a. i. Halogens [1] Solid [1] i on-conductor. Since halogens are non-metals. [1] iv. Electron diagram (outermost shell only) of astatine atom [1] v. Fluorine is more reactive than astatine. Since the reactivity of group VII element decreases down the group [1] b. i. Sodium hydroxide [1] It forms a silvery ball/ floats and moves over water/ gives a fizzy sound/ burns with a golden yellow flame. [1] i Electron diagram of a sodium ion. [1] iv. Sodium ion gives golden yellow flame in flame test [1+1]. 5. a. i. 1. Potassium oxide [1] 2. K 2 O [1] 3. [1] 1. Calcium chloride [1] 2. CaCl 2 [1] 3. [1] P.T.O.
F.3 Final (13-14) Chemistry P. 4 b. i. Set-up of filtration with a container to collect the filtrate [1] Labels of funnel, filter paper, residue (or limestone) and filtrate (or sodium chloride solution) (any TWO) [1] First, heat the sodium chloride solution to give a saturated solution. Second, allow crystallization take place by cooling [1] and then separate sodium chloride crystal by filtration [1]. Wash the crystal with a small amount of distilled water and then dry it. ***End of Paper***