c205_final_f04_51_hints

c205_final_f04_51_hints - Course: CHEMISTRY Instructor:...

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Course: CHEMISTRY Number: 205/4 Section: 51 Instructor: P.H. Bird Examination: Final Date: 16th December, 2004 Time: 19:00-22:30 # of pages: 10 Materials Allowed: A periodic table is attached to this paper - no other materials are allowed . Calculators Allowed: Yes Special Instructions: The first 25 questions are multiple choice and carry 5 marks each. They must be answered on the special answer sheets provided . The others require complete answers written in the space on this exam paper , and they are worth 10 marks each. Please read the instructions before each group of questions . Name: __________________________________ Student Number:______________ Please leave blank 1 2 3 4 5 6 7 8
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Chem 205 Fall 2004 Final Exam Section 51 page 2 The following 25 questions are multiple choice. You may do rough work on your exam paper, but you must mark you answers using a soft pencil on the machine readable answer form provided. Do not forget to mark your name and student number . 1. According to the kinetic-molecular theory of matter, particles in a liquid: a. are packed closely together in a regular array. b. are close together, but they are not confined to specific positions. c. expand to fill their container. d. vibrate back and forth about an average position. e. move slower as the temperature increases. Hint: You need to know how the particles behave in solids, liquids and gases, according to the kinetic- molecular theory. 2. Silver iodide (AgCl) is relatively insoluble in water. At 25 o C, only 214 μ g (micrograms) will dissolve in 1.0 litre of water. How many litres of water are needed to dissolve 5.0 g of silver iodide? a. 4.3 × 10 0 L b. 2.1 × 10 2 L c. 4.3 × 10 2 L d. 1.1 × 10 3 L e. 2.3 × 10 4 L Hint: You need to know how to convert from micrograms ( g) to grams, and after that., the calculation is just one of proportion. 3. Which of the following postulates of Dalton's atomic theory are now known to be incorrect? i. Matter is made up of atoms. ii. Atoms are indivisible and indestructible. iii. All atoms of a given element are identical. a. i b. ii c. iii d. i and iii e. ii and iii Hint: Two of these postulates are now known to be wrong. 4. From the results of his gold foil experiment, Ernest Rutherford concluded that: a. electrons have a charge of -1.602 × 10 -19 C. b. atoms contain roughly equal numbers of neutrons and protons. c. atoms are composed of a small, dense nucleus surrounded by a cloud of electrons. d. many atoms have radioactive isotopes. e. alpha particles are helium nuclei.
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Chem 205 Fall 2004 Final Exam Section 51 page 3 Hint: Rutherford investigated how alpha particles (He nuclei, He 2+ ) are scattered as they pass through a gold foil. What was it doing the scattering? 5.
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This note was uploaded on 09/01/2008 for the course CHEM 205 taught by Professor Bird during the Spring '08 term at Concordia Canada.

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c205_final_f04_51_hints - Course: CHEMISTRY Instructor:...

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