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Q1 : a) Write the electron configurations of the following species e.g. Si is [Ne]3s 2 3p 2

*********************************************************************** Chemistry for Engineers Pop-up Quiz Name____________________ Course: NANO / AERO / ADME ID_______________________ *************************************************************************.

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Q1 : a) Write the electron configurations of the following species e.g. Si is [Ne]3s 2 3p 2

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  1. ********************************************************************************************************************************************** • Chemistry for Engineers Pop-up Quiz Name____________________ • Course: NANO / AERO / ADMEID_______________________ • ************************************************************************* Q1: a) Write the electron configurations of the following species e.g. Si is [Ne]3s23p2 i) B [__]____________ ii) Ti2+ [__]____________ iii) Re3+[__]____________ Q2: Complete the particle numbers table: neutrons electrons a)15N3- b)90Sr2+ c)228Th3+ 8 10 52 36 He 2s22p1 Ar 3d2 138 87 Xe 4f145d4 (3 marks) (6 marks) Q3: Using the Rydberg equation: DE/h = c/l = n = R[(1/nL2 ) – (1/nU2 )] Suppose an electron is moved from the n = 2 to n = 6 quantum level of the hydrogen atom. a) Is radiation absorbed or emitted during the energy change? ___________ b) Calculate the wavelength (nm) of the radiation (show working) . Q4:a) How many valence electrons are there in BrF3? ___ b) Draw the Lewis structure: c) Using VSEPR, what is the electron pair arrangement around central atom? (circle): trigonal bipyramid / tetrahedral / linear / octahedral / trigonal d) What is the molecule shape? ____________________________ R = 3.29 x 1015 Hz, h = 6.63 x 10-34 Js c = 3 x 108 m/s, 1Da = 1 a.m.u. = 1.66 x 10-24 g NA = 6.022 x 1023 absorbed (2 + 4 marks) 410 nm 28 T-shaped (2 + 3 + 2 + 3 marks) Q5:a)A metal has face-centre cubic unit cells of edge length 362 pm. Given that the bulk metal has a density of 8.895 g/cm3, calculate the molar mass of the metal in order to identify it (show calculation): atomic mass_________ g/mol metal _________ (4 marks) 63.5 (1 marks) Total: 30 marks Cu

  2. ********************************************************************************************************************************************** • Chemistry for Engineers Pop-up Quiz Name____________________ • Course: NANO / AERO / ADMEID_______________________ • ************************************************************************* Q1: a) Write the electron configurations of the following species e.g. Si is [Ne]3s23p2 i) N [__]____________ ii) V2+ [__]____________ iii) Hg2+ [__]____________ Q2: Complete the particle numbers table: neutrons electrons a)18O2- b)99Tc2+ c)232Pa2+ 10 10 56 41 He 2s22p3 Ar 3d3 141 89 Xe 4f145d10 (3 marks) (6 marks) Q3: Using the Rydberg equation: DE/h = c/l = n = R[(1/nL2 ) – (1/nU2 )] Suppose an electron is moved from the n = 3 to n = 4 quantum level of the hydrogen atom. a) Is radiation absorbed or emitted during the energy change? ___________ b) Calculate the wavelength (nm) of the radiation (show working) . Q4:a) How many valence electrons are there in SCl5+? ___ b) Draw the Lewis structure: c) Using VSEPR, what is the electron pair arrangement around central atom? (circle): trigonal bipyramid / tetrahedral / linear / octahedral / trigonal d) What is the ion shape? ____________________________ R = 3.29 x 1015 Hz, h = 6.63 x 10-34 Js c = 3 x 108 m/s, 1Da = 1 a.m.u. = 1.66 x 10-24 g NA = 6.022 x 1023 absorbed (2 + 4 marks) 1876 nm 40 distorted pyramid (2 + 3 + 2 + 3 marks) Q5:A metal has face-centre cubic unit cells of edge length 0.409 nm. Given that the bulk metal has a density of 10.46 g/cm3, calculate the atomic mass of the metal in order to identify it (show calculation) atomic mass_________ (g/mol) metal _______ (4 marks) 107.8 Ag (1 marks) Total: 30 marks

  3. ********************************************************************************************************************************************** • Chemistry for Engineers Pop-up Quiz Name____________________ • Course: NANO / AERO / ADMEID_______________________ • ************************************************************************* Q1: a) Write the electron configurations of the following species e.g. Si is [Ne]3s23p2 i) Mg [__]____________ ii) Cr3+ [__]____________ iii) Pt2+ [__]____________ Q2: Complete the particle numbers table: neutrons electrons a)29Si b)107Pd2+ c)239U3+ 15 14 61 44 Ne 3s2 Ar 3d3 147 89 Xe 4f145d8 (3 marks) (6 marks) Q3: Using the Rydberg equation: DE/h = c/l = n = R[(1/nL2 ) – (1/nU2 )] Suppose an electron is moved from the n = 5 to n = 3 quantum level of the hydrogen atom. a) Is radiation absorbed or emitted during the energy change? ___________ b) Calculate the wavelength (nm) of the radiation (show working) . Q4:a) How many valence electrons are there in RnF2? ___ b) Draw the Lewis structure: c) Using VSEPR, what is the electron pair arrangement around central atom? (circle): trigonal bipyramid / tetrahedral / linear / octahedral / trigonal d) What is the molecule shape? ____________________________ R = 3.29 x 1015 Hz, h = 6.63 x 10-34 Js c = 3 x 108 m/s, 1Da = 1 a.m.u. = 1.66 x 10-24 g NA = 6.022 x 1023 emitted 1282 nm (2 + 4 marks) 22 linear (2 + 3 + 2 + 3 marks) Q5:a)A metal is found to crystallise in body-centre cubic unit cells of edge length 647 pm. Given that the bulk metal has a density of 1.63 g/cm3, calculate the atomic mass of the metal in order to identify it (show calculation): atomic mass_____________ g/mol metal:_______ 132.9 (4 marks) Cs (1 marks) Total: 30 marks

  4. ********************************************************************************************************************************************** • Chemistry for Engineers Pop-up Quiz Name____________________ • Course: NANO / AERO / ADMEID_______________________ • ************************************************************************* Q1: a) Write the electron configurations of the following species e.g. Si is [Ne]3s23p2 i) P [__]____________ ii) Mn2+ [__]____________ iii) W4+ [__]____________ Q2: Complete the particle numbers table: neutrons electrons a)37Cl- b)115In3+ c)241Np3+ 15 14 61 44 Ne 3s23p3 Ar 3d5 148 93 Xe 4f145d2 (3 marks) (6 marks) Q3: Using the Rydberg equation: DE/h = c/l = n = R[(1/nL2 ) – (1/nU2 )] Suppose an electron is moved from the n = 7 to n = 2 quantum level of the hydrogen atom. a) Is radiation absorbed or emitted during the energy change? ___________ b) Calculate the wavelength (nm) of the radiation (show working) . Q4:a) How many valence electrons are there in CCl3+? ___ b) Draw the Lewis structure: c) Using VSEPR, what is the electron pair arrangement around central atom? (circle): trigonal bipyramid / tetrahedral / linear / octahedral / trigonal d) What is the molecule shape? ____________________________ R = 3.29 x 1015 Hz, h = 6.63 x 10-34 Js c = 3 x 108 m/s, 1Da = 1 a.m.u. = 1.66 x 10-24 g NA = 6.022 x 1023 emitted 397 nm (2 + 4 marks) 24 trigonal (2 + 3 + 2 + 3 marks) Q5:a)A metal is found to crystallise in body-centre cubic unit cells of edge length 508 pm nm. Given that the bulk metal has a density of 0.99 g/cm3, calculate the atomic mass of the metal in order to identify it (show calculation): atomic mass_____________ g/mol metal:_______ 39.1 (4 marks) K (1 marks) Total: 30 marks

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