CEM 141 - Exam 2 (Chapters 2 and 3)
- ANS-Can atoms of a particular element absorb or emit any wavelength of light?
A) Yes
B) No
A) [He] 2s^2 2p^2 - ANS-What is the electron configuration of carbon?
A) [He] 2s^2 2p^2
B) [Ne] 2s^2 2p^2
C) 1s^2 1p^2
D) [He] 2s^2 4p^2
A) 10 core, 4 valence - ANS-How many core and valence electrons does Si have?
A) 10 core, 4 valence
B) 4 core, 10 valence
C) 12 core, 2 valence
Si: [Ne] 3s^2 3p^2
A) 2 core, 5 valence - ANS-How many core and valence electrons does N have?
A) 2 core, 5 valence
B) 5 core, 2 valence
C) 4 core, 3 valence
N: [He] 2s^2 2p^3
A) 2.14 x 10^11 J/mol - ANS-Each deuterium atom is formed 1 proton, 1 neutron, and 1
electron. How much energy is released by the formation of 1 mole of deuterium (D) atoms?
A) 2.14 x 10^11 J/mol
B) 3.56 x 10^-13 J/mol
C) 2.14 x 10^14 J/mol
D) 1.29 x 10^38 J/mol
Useful Info:
E=mc^2
Mass defect: 0.00238 amu
1 amu = 1.6606 x 10^-27 kg
, c = 3.00 x 10^8 m/s
1 J = 1 kg m^2 s^-2
1 mol D = 6.022 x 10^23 D atoms
A) 2.75 x 10^-10 m - ANS-What is the wavelength of an electron moving at 2.65 x 10^6 m s^-1?
A) 2.75 x 10^-10 m
B) 2.75 x 10^-10 J
C) 1.93 x 10^3 m
D) 1.93 x 10^3 J
Useful Info:
-Mass of an electron is 9.1 x 10^-31 kg
- h = 6.626 x 10^-34 J s
- 1 J = 1 kg m^2 s^-2
A) absorb (in order to break LDFs) - ANS-Do phase changes absorb or release energy?
A) Absorb
B) Release
A) Ar - ANS-Which of the following has the smallest atomic radius?
A) Ar
B) Al
C) Ga
D) Kr
A) C-13 - ANS-Which is an isotope of C-12?
A) C-13
B) N-12
C) Mg-12
A) electrostatic - ANS-As 2 nuclei move toward each other ( but are still separated by distances
greater than the size of the nucleus) what force affects them?
A) electrostatic
B) gravity
C) strong nuclear
D) weak nuclear
A) Green - ANS-Which transition is more likely from level 1 to level 3?
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