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CEM 141 FINAL Questions And Answers Rated A+ New Update Assured Satisfaction
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CEM 141 FINAL Questions And Answers Rated A+ New Update Assured Satisfaction
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CEM 141 FINAL-It is impossible to predict from the information provided, the color of the product does not
depend on the color of the reactant(s) since the properties of the product are emergent - ANS-A
compound that is red in color reacts with a compound that is yellow in color to make a product.
At room temperature, what color will the product be and why?
2 DIFFERENT atoms together - ANS-Compounds must be
2H+1H=3He - ANS-Which of the following is an example of nuclear fusion?
All atoms are indivisible and indestructible - ANS-Thomson's cathode ray tube experiment
proved false what part of Dalton's atomictheory?
As you go left to right, the one to the right is more because it has a higher effective nuclear
charge.
As you go down, the one higher up is more because the bonding electrons are closer to the
nucleus. - ANS-Which is more electronegative?
Atoms are mostly empty space. Atoms are in constant motion - ANS-Which of the following
properties ascribed to atoms by the Greeks do we still consider valid?
attraction between electrons of one atom and the nucleus of another - ANS-Covalent bonds are
caused by
Because the repulsive force, between the overlapping electron clouds, is dominant - ANS-Why
does the potential energy increase as two xenon atoms move extremely close together?
Between IE 6 and IE 7. This is 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 jimp in the
successive ionization energies for oxygen? (You count up the valence electrons, the jump will
be 6-7 if the atom has 6 valence electrons)
Butane contains a larger electron cloud, because butan is more polarizable the molecules have
larger instanteneous dipoles and stronger LDFS, requiring more energy to overcome -
ANS-Why does butane (CH3CH2CH2CH3) have a higher boiling point than ethane (CH3CH3)?
Ca2+ is smaller because it has more protons pulling on the same number of electrons as in S2-
- ANS-Do you predict S2- or Ca2+ to have a smaller ionic radius? Why?
Can transfer energy and matter - ANS-Open system (humans)
, 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)?
Cl2. When this substance boils, LDFs are overcome. The strength of the LDFs depends on the
size of the electron cloud. (The bigger the electron cloud the more LDFs it will have requiring
more energy). - ANS-Which do you predict has the higher boiling point and why? Cl2 or Ar
Copper (Cs = 0.385 J/ g oC) - The one with the lowest energy will always need the lowest
energy to change the temperature as a whole compared to if you added 10ml of hot water to a
gallon of cold water. - ANS-If the same amount of thermal energy were transferred to equal
masses of water, copper,granite and ethanol, which substance would reach the highest
temperature?
Decreases - ANS-If the molar mass of a gas increases, what happens to the average velocity?
decreases because the relative attraction between the protons and the outer electrons
increases - ANS-Atomic radius _______ from left to right across a row on the Periodic Table.
Dipole-dipole interactions are the stronger force due to the presence of permanent dipoles -
ANS-Dipole-dipole interactions and London dispersion forces are two types of
intermolecularforces. For molecules of about the same size
Each element has different allowed energies for its electrons (ie different energy levels).Since
the differences in energy between those levels are different, the energies of the photons
released will also be different. Different energy photons have different colors. - ANS-Explain why
the lines are different for each element
Effective nuclear charge and the Shell/principal quantum number of valence shell electrons -
ANS-Identify the aspects of atomic structure that determine the electrostatic forces that
controlthe size of an atom
Energy is absorbed into the system and interactions between the molecules are overcome -
ANS-What happens to the system when a molecular substance (such as H2) boils?
Energy is released and a new molecule is formed - ANS-When a covalent bond forms between
two hydrogen atoms
F2, because the LDFs between fluorine molecules are stronger, requiring more energy to
overcome - ANS-Which do you predict to have the higher boiling point, fluorine (F2) or neon
(Ne) and why?
Formal charge = # of valence electrons - sticks - dots - ANS-How do you find formal charge?
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