Transcript No Slide Title

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Chemistry for Engineers Pop-up Quiz
Name____________________
Course: NANO / AERO / ADME
ID_______________________
*************************************************************************
Q1: a) Write the electron configurations
of the
following species e.g. Si is [Ne]3s23p2
Q2: Complete the particle numbers table:
neutrons
electrons
8
52
138
10
36
87
a) 15N3i) B
[__]____________
He 2s22p1
2+
Ar 3d2
ii) Ti [__]____________
iii) Re3+[__]____________
Xe 4f145d4
b) 90Sr2+
(3 marks)
c) 228Th3+
(6 marks)
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
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.
absorbed
a) Is radiation absorbed or emitted during the energy change? ___________
b) Calculate the wavelength (nm) of the radiation (show working)
.
(2 + 4 marks)
410 nm
28
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
T-shaped
d) What is the molecule shape? ____________________________
(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):
(4 marks)
63.5 g/mol
atomic mass_________
metal _________
Cu
(1 marks)
Total: 30 marks
***********************************************************************
Chemistry for Engineers Pop-up Quiz
Name____________________
Course: NANO / AERO / ADME
ID_______________________
*************************************************************************
Q1: a) Write the electron configurations
of the
following species e.g. Si is [Ne]3s23p2
Q2: Complete the particle numbers table:
a) 18O2i) N
[__]____________
He 2s22p3
2+
Ar 3d3
ii) V [__]____________
iii) Hg2+ [__]____________
Xe 4f145d10
(3 marks)
b) 99Tc2+
c) 232Pa2+
neutrons
electrons
10
56
141
10
41
89
(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.
absorbed
a) Is radiation absorbed or emitted during the energy change? ___________
b) Calculate the wavelength (nm) of the radiation (show working)
.
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
(2 + 4 marks)
1876 nm
Q4:a) How many valence electrons are there in SCl5+? 40
___
b) Draw the Lewis structure:
c) Using VSEPR, what is the electron pair arrangement around central atom? (circle):
trigonal bipyramid / tetrahedral / linear / octahedral / trigonal
distorted pyramid
d) What is the ion shape? ____________________________
(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)
107.8 (g/mol)
atomic mass_________
metal _______
Ag
(4 marks)
(1 marks)
Total: 30 marks
***********************************************************************
Chemistry for Engineers Pop-up Quiz
Name____________________
Course: NANO / AERO / ADME
ID_______________________
*************************************************************************
Q1: a) Write the electron configurations
of the
following species e.g. Si is [Ne]3s23p2
Q2: Complete the particle numbers table:
neutrons
a) 29Si
i) Mg [__]____________
Ne 3s2
3+
Ar 3d3
ii) Cr [__]____________
iii) Pt2+ [__]____________
Xe 4f145d8
b) 107Pd2+
(3 marks)
c) 239U3+
15
61
147
electrons
14
44
89
(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.
emitted
a) Is radiation absorbed or emitted during the energy change? ___________
b) Calculate the wavelength (nm) of the radiation (show working)
.
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
(2 + 4 marks)
1282 nm
22
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
linear
d) What is the molecule shape? ____________________________
(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):
132.9
atomic mass_____________
g/mol
Cs
metal:_______
(4 marks)
(1 marks)
Total: 30 marks
***********************************************************************
Chemistry for Engineers Pop-up Quiz
Name____________________
Course: NANO / AERO / ADME
ID_______________________
*************************************************************************
Q1: a) Write the electron configurations
of the
following species e.g. Si is [Ne]3s23p2
Q2: Complete the particle numbers table:
neutrons
a) 37Cl-
i) P
[__]____________
Ne 3s23p3
2+
Ar 3d5
ii) Mn [__]____________
iii) W4+ [__]____________
Xe 4f145d2
b) 115In3+
(3 marks)
c) 241Np3+
15
61
148
electrons
14
44
93
(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.
emitted
a) Is radiation absorbed or emitted during the energy change? ___________
b) Calculate the wavelength (nm) of the radiation (show working)
.
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
(2 + 4 marks)
397 nm
24
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
trigonal
d) What is the molecule shape? ____________________________
(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):
39.1
atomic mass_____________
g/mol
K
metal:_______
(4 marks)
(1 marks)
Total: 30 marks