General_Chemistry_I_Final_Exam_Sem_1_2009 - UNIVERSITY OF TECHNOLOGY JAMAICA FACULTY SCIENCE AND SPORT SCHOOL NATURAL AND APPLIED SCIENCES Final

General_Chemistry_I_Final_Exam_Sem_1_2009 - UNIVERSITY OF...

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UNIVERSITY OF TECHNOLOGY, JAMAICA FACULTY: SCIENCE AND SPORT SCHOOL: NATURAL AND APPLIED SCIENCES Final Examination, Semester I _____________________________________________________________________________ Module Name: General Chemistry I Module Code: CHY2021 Date: December 2009 Theory/Practical: Theory Groups: AS-1/MT-1/DN-1/EH-1/SE-2/BENG-1/BUILT-1 Duration: 2 HOURS ______________________________________________________________________________ Instructions: This paper consists of a cover page and 3 printed pages with six (6) questions. ANSWER ANY FOUR (4) QUESTIONS ______________________________________________________________________________ Constants : 1atm = 760 mmHg = 760 torr = 101.3 kPa Avogadro’s number ( N A ) = 6.022 10 23 Universal gas constant, R = 8.314 J mol -1 K -1 = 0.08206 L.atm K -1 mol -1 Planck’s constant ( h ) = 6.626 10 -34 Js Speed of light ( c ) = 3.00 10 8 m s -1 Rydberg constant, R H = 2.18 10 -18 J 1 Faraday = 96,500 C/mol e - 1 mol any gas at stp = 22.4 dm 3 , at room temperature = 24 dm 3 ______________________________________________________________________________ DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO 0
QUESTION 1a.Use the kinetic particle theory to account for the different states of matter. [4]b.Differentiate between the following:(i)chemical and physical properties(ii)homogeneous and heterogeneous mixtures[2 + 2]c.Discuss Rutherford’s Gold Foil Experiment and the conclusions made from this experiment in the early elucidation of the atomic structure.{NB: the use of suitable and clearly labelled diagrams are expected}[6]d.Calculate the principal quantum number energy level (nf) reached when an electron is excited from the n= 2 quantum level by absorbing 4.088 10-19Jin a hydrogen atom.[3]e.Draw representatives of the three, 2 porbitals. How do they differ? [3] [Total = 20 marks]

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