Student Number: Fall 2007 Chemistry 1000 Midterm #1A / 60 marks

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1 Fall 007 Chemistry 1000 Midterm #1A / 60 marks INSTRUCTIONS: 1) Please read over the test carefully before beginning. You should have 6 pages of questions, and a formula/periodic table sheet (7 pages total). ) If your work is not legible, it will be given a mark of zero. 3) Marks will be deducted for incorrect information added to an otherwise correct answer. 4) Marks will be deducted for improper use of significant figures and for missing or incorrect units. 5) Show your work for all calculations. Answers without supporting calculations will not be given full credit. 6) You may use a calculator. 7) You have 90 minutes to complete this test. 1. (a) [8 marks] Fill in the name and symbol for each of the missing elements in the piece of periodic table below. [6 marks] H He 1 hydrogen helium Ne neon Ar argon Kr krypton (b) Give the name and symbol for each of the elements below: [ marks] name symbol i. Z = 6 ii. Z = 9

2 . Complete the table below. [5 marks] Isotope: 66 Zn + Number of electrons: 54 Number of neutrons: 74 Number of protons: Overall charge: Thallium has two naturally occurring isotopes: 03 Tl and 05 Tl. The natural abundance of 03 Tl is 9.54% and it has an isotopic mass of u. Calculate the isotopic mass of 05 Tl. [4 marks]

3 4. For each of the following sets of quantum numbers, indicate the maximum number of electrons allowed in a single atom. If the answer is none (i.e. if there is no such orbital), briefly explain why that is the case. [6 marks] (a) n = 4 l = - m l = m s = -½ (b) n = l = 1 m s = -½ (c) n = 3 l = 5. Sketch all the atomic orbitals corresponding to n = in a single atom. Each sketch should include: [4 marks] i. a clearly labeled set of axes, and ii. the label ( name ) of the orbital.

4 6. [6 marks] (a) Write the complete electron configuration for a ground state neutral atom of silicon. [ marks] (b) Draw an orbital occupancy diagram showing the valence electrons of a ground state neutral atom of silicon. Label the subshells on your diagram. [3 marks] (c) Is a silicon atom paramagnetic or diamagnetic? [1 mark] 7. (a) [6 marks] Write the electron configuration for a ground state neutral atom of yttrium (Y) using the noble gas abbreviation. [ marks] (b) Write the electron configuration for Y 3+ using the noble gas abbreviation. Show any electrons in the outer shell of the ion explicitly. (In other words, your answer should show more than a noble gas core abbreviation.) [ marks] (c) Which is larger, an atom of Y or an Y 3+ cation? Justify your answer. [ marks]

5 8. One of the key observations about the photoelectric effect is that there is a cutoff frequency below which no electrons are ejected. Explain why this is the case. [4 marks] 9. List the following elements in order of increasing size: carbon, nitrogen, silicon, titanium. [ marks] smallest largest 10. Which of the following elements has the more negative enthalpy of electronic attraction, aluminum or silicon? [1 mark] 11. The second ionization energy of an atom is generally larger than the first but, even taking this general observation into account, the second ionization energies of some elements are particularly large. Boron is one such element. Its first ionization energy is kj/mol while its second ionization energy is 47.0 kj/mol. Explain why the second ionization energy of boron is so much larger than its first ionization energy. [5 marks]

6 1. (a) (b) [9 marks] At what wavelength should you look for the line in the emission spectrum of He + corresponding to the transition from n = to n = 1? Express your final answer using an appropriate SI prefix so that the value is between 0.1 and [7 marks] Will the line in the emission spectrum of He + corresponding to the transition from n = 3 to n = have a longer or shorter wavelength than the line corresponding to the transition from n = to n = 1? Justify your answer. It is not necessary to show a calculation for part (b) of this question. [ marks]

7 Some Useful Constants and Formulae Fundamental Constants and Conversion Factors Atomic mass unit (u) kg Planck's constant J Hz -1 Avogadro's number mol 1 Proton mass u Bohr radius (a 0 ) m Neutron mass u Electron charge (e) C Rydberg Constant (R H ).179 x J Electron mass u Speed of light in vacuum.9979 x 10 8 m s -1 Formulae c = λυ E = hυ p = mv λ = h p x p > h 4π n r n a0 Z Z n = En = RH Ek = 1 mv 1 CHEM 1000 Standard Periodic Table H Rb Cs 55 (3) Fr Sr Ba Ra Sc Y 39 La-Lu Ac-Lr Ti 91.4 Zr Hf 7 (61) Rf V Nb Ta 73 (6) Db Cr Mo W 74 (63) Sg Mn 5 (98) Tc Re 75 (6) Bh Ru Os 76 (65) Hs Co Rh Ir 77 (66) Mt Ni Pd Pt 78 (81) Dt Ag Au 79 (83) Rg Zn Cd Hg B Al Ga In Tl C Si Ge Sn Pb N P As Sb Bi Te 5 (10) Po I 53 (10) At He Ne Ar Kr Xe 54 () Rn La Ac Ce Th Pr Pa Nd U 9 (145) Pm Np Sm 6 (40) Pu Eu 63 (43) Am Gd 64 (47) Cm Tb 65 (47) Bk Dy 66 (51) Cf Ho 67 (5) Es Er 68 (57) Fm Tm 69 (58) Md Yb 70 (59) No Lu 71 (60) Lr 103 Developed by Prof. R. T. Boeré

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