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Sch2107:Inorganic Chemistry I Question Paper
Sch2107:Inorganic Chemistry I
Course:Bachelor Of Science In Public Health
Institution: Meru University Of Science And Technology question papers
Exam Year:2011
QUESTION ONE (30 MARKS)
a) i) Define Pauli’s exclusion principle. (2 Marks) ii) Write the electronic configuration of the elements with the atomic numbers; 17, 35 and 24. (3 Marks) iii) Using the electronic configuration in part ii) above determine the period and the group to which the elements belong to. (6 Marks) b) draw Lewis structures for the following ions/molecules i. Chlorate ion ??????3 - ii. Hydronium ion ??3??+ iii. Hydrogen peroxide ??2??2 (6 Marks) c) Define the following terms; i. Wavelength ii. Frequency iii. Nuclides iv. Transmutation (8 Marks) d) State which of the following orbitals cannot exist according to the quantum theory; 2p, 2d, 3f, 4f, 6s. Briefly explain your answer. (5 Marks)
QUESTION TWO (20 MARKS)
a) The frequency of the radiation used in microwave ovens is 2.45 GHz. What is the wavelength of this radiation in metres? Given that the speed of light= 2.998 × 108??/??. (4 Marks) b) Compare the following three elements Silicon – atomic number 14
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Carbon – atomic number 6 Oxygen – atomic number 8 i. Arrange these elements in order of increasing atomic radius. (3 Marks) ii. Which of the three elements has the largest ionization energy? (2 Marks) iii. Which of the elements, carbon and oxygen has the more electron affinity. (3 Marks) c) Complete the following nuclear reactions; i. ?? 5 10 + ???? 2 4 ? ?? 7 13 + __________ ii. ???? 29 64 ? ?? +1 0 + __________ iii. ???? 11 23 + ???? 2 4 ? ???? 12 26 + ______ (4 Marks) d) Define the following reactions of the Born-Haber cycle. i. Crystal lattice energy ii. Heat of formation iii. Bond dissociation energy. (4 Marks)
QUESTION THREE (20 MARKS)
a) Calculate the wavelength associated with an electron of mass ?? = 9.109 × 10-28?? that travels at 40.0% of the speed of light. Given that: Planck’s constant, ?? = 6.626 × 10-34????.??2/??2. Speed of light = 2.998 × 108??/??. (4 Marks) b) i) Define Hund’s rule. (2 Marks) ii) Determine the number of unpaired electrons in the elements with the following atomic numbers 22, 29 and 33. (3 Marks) iii) State whether the element in part ii) above are paramagnetic of diamagnetic. (3 Marks) c) The distance between an oxygen atom and a hydrogen atom in a water molecule is 95.8 Pm. what is this distance in i. Metres ii. Nanometers (4 Marks) d) By giving an examples, briefly describe hydrogen bonding. (4 Marks)
QUESTION FOUR (20 MARKS)
a) Using the information given below, construct a Born-Haber cycle and use it to calculate the first electron affinity of chlorine. ????????? ???? = +122????/?????? ????????? ???? = +148????/?????? ???1???????????????????????? ???????????? ???? = +738?????????? ??? 2???? ???????????????????? ???????????? ???? = +1451?????????? ????????????? ???? ???????????? ????????2 = -2526????/?????? ??? ?????????????????? ????????2 = -641????/??????
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b) 25.3g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250ml of solution. What is the concentration of Na2CO3? Given Na = 23, C = 12, O=16. (3 Marks) c) Briefly describe three types of chemical reactions. (6 Marks) d) Differentiate between covalent and ionic bonding. (1 Mark)
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