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CEM 141 Final Exam Study Guide Questions And Answers Rated A+ New Update Assured Satisfaction
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CEM 141 Final Exam Study Guide10 core and 6 valence. - ANS-How many core and valence electrons are in one atom of sulfur?
5.4 mol - ANS-If 9.0 moles of oxygen gas are consumed with excess propane in the following
reaction, how many moles of carbon dioxide will be produced?
C3H8 (g) + 5 O2 (g) --> 3 CO2 (g) + 4 H20 (g)
7.35 x 10^-19 J - ANS-Electrons will be ejected from the surface of the metal molybdenum (Mo)
by photons of 274 nm or less. What is the minimum energy required to eject an electron from
the Mo surface?
A 5 gram block of gold, because in order to melt, there must be more than one particle present
so that the forces between the particles can be overcome. - ANS-Which of the following
substances would you expect to have a measurable melting point?
An sp3 hybrid orbital in N and an sp2 hybrid orbital in C. - ANS-According to the valence bond
theory, the bond that forms between the nitrogen and carbon shown in the box is formed by an
overlap of:
Bent - ANS-What is the molecular shape of the molecule SBr2?
Claim: I2 has stronger attractive forces between molecules than Br2
Reasoning: I2 has a larger electron cloud and stronger LDFs than Br2 which require more
energy to overcome when it melts. - ANS-Using the following evidence, what claim and
reasoning can you make?
Evidence: The melting point of I2 is 114 C and the melting point of Br2 is -7.2 C.
Decrease, because the particles are attracted to each other. - ANS-As an electron and a proton
move towards each other, the potential energy of the system will:
Decreasing, because the nuclear fusion in the stars combines lighter nuclei into heavier nuclei. -
ANS-Select the correct combination of claim, scientific principle, and reasoning.
Claim: The total number of atoms in the Universe is?
Scientific principle and reasoning:
Delocalized valence electrons hold the copper together as the nuclei move relative to each
other. - ANS-What is the best explanation as to why copper is ductile? (can be pulled into thin
wires).
Electrons would be emitted from the surface because light at 100 nm has more energy than light
at 274 nm so it is above the required threshold frequency. - ANS-Considering the Mo surface
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