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CEM 141 - Cumulative Final Questions And Answers Rated A+ New Update Assured Satisfaction
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CEM 141 - Cumulative Final[Kr] 5s^2 4d^10 5p^5 - ANS-What is the [core]-valence electron configuration for iodine?
+1 - ANS-What is the formal charge on the N in the structure on Figure C?
1 and 3 - ANS-The Lewis structure for neopentane is shown in Figure B. Which of the other
structures below it are appropriate representations for neopentane?
1.5 x 10^15 Hz - ANS-One type of electromagnetic radiation has a wavelength of 200 nm. What
is the frequency of this radiation?
1.71 x 10^-11 m - ANS-What is the wavelength of an electron traveling at a velocity of 4.25 x
10^7 m s^-1?
10 core and 4 valence - ANS-How many core and valence electrons are in one atom of silicon
(Si)?
2 - ANS-See Figure M. Which is an example of nuclear fusion?
3 - ANS-Figure A is an incomplete molecular orbital diagram. Complete the diagram for the
imaginary diatomic molecule X2, where each atom of X has 5 valence electrons in s and p
orbitals. Based on your diagram, how many bonds does this molecule have?
3 - ANS-Which of the diagrams on Figure K best illustrates the set of orbitals in which all of the
electrons of a nitrogen (N) atom reside?
3 and 5 - ANS-See figure H. Which of the numbered bonds are hydrogen bonding interactions?
4 - ANS-Figure J represents x-ray light. Which of the diagrams below would represent ultraviolet
light?
4 - ANS-See Figure I. Select the answer in which the molecules are ranked from highest boiling
point to lowest boiling point.
5 moles I2 - ANS-Which of the following contains the largest number of atoms?
2 moles Br2; 3 moles H2O; 5 moles I2; 6 moles He; they all have the same number
7 - ANS-Ethane (C2H6) burns in oxygen (O2) to produce carbon dioxide (CO2) and water
(H2O). Balance this equation. What is the coefficient of oxygen in the balanced equation?
, 73% - ANS-Methane reacts with oxygen to produce carbon dioxide and water according to the
following chemical equation: CH4(g) + 2 O2(g) -> 2 H2O(l) +CO2(g)
In a reaction, 3 moles of CH4 react with excess O2 and 97g CO2 are produced. What is the
percent yield for this reaction?
94.5 g - ANS-Aluminum reacts with oxygen to form aluminum oxide: 4 Al + 3 O2 -> 2 Al2O3
If 50.0 grams of aluminum react with 50.0 grams of oxygen, what mass of aluminum oxide is
produced?
Between IE 6 and IE 7 because it requires more energy to remove a core electron than to
remove a valence electron. - ANS-Where would you predict there to be a big jump in the
successive ionization energies for oxygen?
Both show elements - ANS-Compare the atomic/molecular level representations shown in
Figure N. Which of the following statements are true?
Both show elements; Both show compounds; Both show discrete atoms; Both show molecules
Butane contains a larger electron cloud. Because butane is more polarizable, the molecules
have larger instantaneous dipoles and stronger London Dispersion Forces, requiring more
energy to overcome. - ANS-Select the evidence and reasoning for the following claim.
Claim: Butane (CH3CH2CH2CH3) has a higher boiling point than ethane (CH3CH3).
Evidence: Butane contains more bonds; Butane contains a larger electron cloud
Reasoning: More bonds require more energy to break, so the boiling point is higher; Because
butane is more polarizable, the molecules have larger instantaneous dipoles and stronger
London Dispersion Forces, requiring more energy to overcome; Molecules with more bonds
have more atoms and weigh more, so more energy is required to overcome gravity upon boiling;
The larger electron cloud allows for more hydrogen bonding interactions to occur between
molecules, requiring more energy to overcome gravity
C - ANS-The diagram on Figure L represents energy transitions for an electron in an atom.
Which arrow represents the transition that would result in the absorption of a photon with the
highest energy?
Ca^2+ is smaller because it has more protons pulling on the same number of electrons as in
S^2-. - ANS-Do you predict S^2- or Ca^2+ to have a smaller ionic radius? Why?
Channels of empty space form in the solid state, but not the liquid state, due to
hydrogen-bonding between water molecules. - ANS-Why is liquid water more dense than solid
water (ice)?
Curve Y, because the weaker LDFs in neon require less energy to overcome and neon atoms
are smaller than argon atoms. - ANS-The potential energy curves on Figure Q show how the
potential energy changes as two argon atoms approach and as two neon atoms approach.
Which curve represents neon and why?
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