c205_final_w05_04_and_52_hints

c205_final_w05_04_and_52_hints - Course CHEMISTRY...

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Course: CHEMISTRY Number: 205/4 Section: 04 and 52 Instructor: P.H. Bird Examination: Final Date: 18 th April, 2005 Time: 19:00-22:00 # of pages: 10 Materials Allowed: A periodic table is attached to this paper - no other materials are allowed . Calculators Allowed: Yes (Cell phones or electronic dictionaries may NOT be used as calculators.) Special Instructions: This exam contains three sections. Please read the instructions before each section carefully. Name: __________________________________ Student Number:______________ Please leave blank Section I /5 Section II /50 Q31/2 Q32/3 Q33/5 Q34/5 Q35/5 Section III /20 Total /80
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Chem 205 Winter 2005 Final Exam Sections 04 and 52 page 2 Section I. Complete each of the following five statements with the appropriate word(s). They are worth 1 mark each. (The answer checker does not have answers for these questions.) 1. The lowest energy state of an atom is called its ____________________ state. Hint: Not an “excited” state! 2. A(n) _________________ is a massless particle of radiation. Hint: Einstein postulated this particle as an alternative to the wave theory of electromagnetic radiation. 3. Half the distance between two metal atoms in a pure crystal of the metal is equal to the ______________________________ of the metal. Hint: This is one of the several measures of atomic size. 4. In addition to being farthest from the nucleus, the electrons in the _______________ shell are also responsible for an element’s chemical properties. Hint: Not the core electrons. 5. In valence bond theory, a π bond is described as the sideways overlap of two unhybridized _____________ orbitals. Actually, there could be a number of answers to this, but give the simplest. Section II. The following 25 questions are multiple choice. They are worth 2 marks each. You may do rough work on your exam paper, but it will not be marked. You must mark your answers using a soft pencil on the machine readable answer form provided. Do not forget to mark your name and student number (your birth date is not required). 6. All atoms of the same element have the same number of ________ in their nucleus. a. neutrons b. electrons c. protons d. neutrons and protons e. neutrons, protons, and electrons Hint: The number corresponds to the atomic number. 7. What method is used to determine the exact masses of isotopes and their relative abundances? a. density measurements b. filtration c. electron microscopy d. scanning tunneling microscopy e. mass spectrometry Hint: The method works with cations of the atoms, and can also be used for molecular masses.
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Chem 205 Winter 2005 Final Exam Sections 04 and 52 page 3 8. Which two of the atoms below have the same number of neutrons? a.
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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_w05_04_and_52_hints - Course CHEMISTRY...

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