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CEM 141 MSU Exam 2 Questions And Answers Rated A+ New Update Assured Satisfaction
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CEM 141 MSU Exam 2 Questions And Answers Rated A+ New Update Assured Satisfaction
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CEM 141 MSU Exam 2[He] 2s^2 2p^4 - ANS-What is the core/valence electron configuration of O?
= Protons - Core Electrons
Increases across the row, decreases down the group (as atomic radius decreases)
How tight the electrons are being attracted to the nucleus. - ANS-Effective Nuclear Charge
10 core, 4 valence. - ANS-How many core electrons and valence electrons does Si have?
10^-16 - 10^8 = 24. Only a third are visible - ANS-Range of Wavelengths
13.8 billion years ago, singular event in which matter was created. - ANS-Big Bang
1s^2 2s^2 2p^4 - ANS-What is the electron configuration of O.
2 core, 5 valence. - ANS-How many core electrons and valence electrons does N have?
3. - ANS-How many valence electrons do elements in group 3A have?
A photon has a certain energy and wavelength. - ANS-What is true considering the
wave-particle duality of light?
According to band theory, there's a large gap between the valence band and conduction band. -
ANS-Insulators
According to band theory, there's a small gap between valence band and conduction band. -
ANS-Semiconductors
According to band theory, valence band overlaps with conduction band. - ANS-Metals
Adding two small/light nuclei together to create more stable element, releases energy, occurs in
stars
Ex: Hydrogen burning and helium burning. - ANS-Nuclear Fusion
All. - ANS-How many orbitals are in the electron cloud of one atom?
Allotrope of Carbon with high melting point, hard, brittle, translucent, does not conduct
electricity, insulator
C-C-C bond angle is 109. - ANS-Diamond
, Allotrope of Carbon with high melting point, soft, slippery, grey, shiny, conducts electricity. -
ANS-Graphite
At the size of 1-100nm, have different properties than bulk materials, depends on surface area
to size ratio. - ANS-Nanoparticles
Atomic orbitals combine constructively to form a molecular orbital of lower energy, stabilizing, in
phase, creates sigma orbital. - ANS-Bonding Orbitals
Atomic orbitals combine destructively to form a molecular orbital of higher energy, destabilizing,
out of phase, creates sigma star orbital. - ANS-Antibonding Orbitals
Atoms in which electrons have been added/removed. - ANS-Ions
Atoms with the same number of electrons but different number of protons, the attraction
between electrons and protons increases as the charge of the nucleus increases. -
ANS-Isoelectronic Series
Because sheets of graphite are held to each other by weak LDFs whereas only covalent bonds
exist within diamond. - ANS-What is the best explanation for why graphite is slippery whereas
diamond is not?
Because the universe is expanding, frequency of things decreases the farther away they are
(wavelength increases). - ANS-Red Shift
Binding energy, the energy released when mass is converted to energy (nuclear reaction). -
ANS-E = mc2
Bond that is relatively weak, caused by fluctuating charge distribution, increases with size of
electron cloud (predictable), present between all molecular species, between separate
molecules. - ANS-LDF
C = 3.00 X 10^8
= wavelength X frequency - ANS-Velocity of Light
Cl2 because covalent networks require more energy to boil than discrete molecules/atoms. -
ANS-Does cl2 or He have a higher boiling point and why?
Combining n atomic orbitals to n molecular orbitals. - ANS-Molecular Orbital Theory
Covalent bond formed by overlapping atomic orbitals, stronger than pi bond. - ANS-Sigma Bond
Covalent bond formed by overlapping p orbitals, weaker than a sigma bond. - ANS-Pi Bond
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