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Q - Which atom has a larger atomic radius?
A) Ar C) Cl
B) Na D) Li
Q - How Many Sigma and Pi bond does N2 contain?
A) one sigma, four pi
B) two sigma, two pi
C) three sigma
D) three pi
E) one sigma, two pi
What are the the three atoms that bond to hydrogen in hydrogen bonding?
What are the two ways for a molecule to have a bent geometry?
unshared electron pairs (~109.5°)
A planar triangle geometry with one
unshared electron pair (~120°)
What are the four types of Unit Cells possible for crystal structures??
Face centered 4r = 2 (sqr. Root r)
Body centered 4r = s (cube root r)
Q - Which is NOT linear?
Why is the P-Cl bond in PCl5 a stronger bond than the C-O in carbon monoxide?
A) Increased Dipole - Dipole Forces
B) Hydrogen Bonding
C) Increased London Dispersion Forces
Which of the following is not a gas at room temperature?
Under what conditions would a substance sublimate at room conditions (25 °C and 1 atm)?
A) the critical temperature must be below the triple point
B) the slope of the fusion line should be negative
C) the triple point must be at a pressure greater than 1 atm
D) the solid phase must be more dense than the liquid phase
What would happen to the pressure of a gas if the temperature is tripled, the volume is doubled, and the number of gas molecules is quadrupled ? . . . .
B) T x (3/1)(2/1)(4/1)
C) T x (3/1)(1/2)(4/1)
D) T x (3/1)(1/2)(1/4)
Volume is doubled P=k(1/V)
Moles is quad. P = kn
Is the slope for the solid/ liquid line in the phase diagram of water positive, negative, or can be either?
The kinetic molecular theory predicts that at a given temperature...
B) All gas molecules have the same
C) Only real gas molecules collide
with each other
D) On average, heavier molecules move more slowly
E) Elastic collisions result in the loss of energy.
All of the following physical properties change as solute is added to the solution. Which is NOT a colligative property?
A) Boiling Point D) Surface Tension
B) Vapor Pressure E) Melting Point
C) Osmotic Pressure
Which of the following is most likely to be soluble in hexane?
A) KCl D) H2O
B) C2H5OH E) C6H6
What is the free energy of a system at equilibrium? . . .
< 0 if spontaneous
> 0 if non-spontaneous
When ∆H is positive and ∆S is negative, will temperature changes have an effect on the spontaneity of a reaction?
The rate of reaction will be large if:
A) ∆G° is a large (-) number
B) ∆S° is a large (-) number
C) ∆H° is a large (-) number
D) Keq is a large (+) number
E) None of the above
The Law of Dulong and Petit says that the molar specific heat of solid elements is approximately 25 J/mol•K. This suggests that. . .
b) the heat absorbed depends on the volume change with temperature
c) the heat absorbed can be calculated from the 1st Law of Thermodynamics
d) this law is an oddity since it does not apply to elements that are liquids / gases
An inorganic catalyst doesn’t...
A) Ensure proper geometry
B) Weaken existing bonds
C) Lose effectiveness when heated
D) Decrease the activation energy of a reaction
Catalysts lower the activation energy of a reaction thus increasing the rate by ensuring proper geometry and weakening existing bonds in the molecule.
Only ORGANIC catalysts are effected by a temperature change.
What equation would you use to solve:
How much heat does it take to raise 10 grams of water by 10°C? . . .
What is the equation is used to find how temperature changes affect rates of reaction?
k1 R T2•T1
Which of the following would produce odor if heated?
A) NH3 D) PbI2
B) Na+(aq) E) A and C
One mole of electrons is how many coulombs?
A molecule of NaHSO4 is . . .
HSO4- is acidic because it can further produce H+ ions in solution (but it also has amphoteric properties).
Which of the following compounds includes an element that has the same oxidation # as the chlorine in sodium chlorate, NaClO3?
A) K3Fe(CN)6 D) (NH4) 2SO4
B) KMnO4 E) KClO4
B) batteries are galvanic cells
C) a spontaneous reaction always has a (+) E°cell
D) electrolysis reactions always produce a gas at at least one electrode
E) Galvanic cells can be used to determine equilibrium constants
What will be the products of the following equation?
FeCl2 + HCl + KMnO4 -->
FeCl3 + MnCl2 + H2O + KCl
Ox: Fe2+ --> Fe3+ + e-
Red: MnO4 - + H+ --> Mn2+ + H2O
(K+ and Cl- are spectator ions)
Predict the net ionic equation for the following reaction and tell what form the reactants will be present . . .
The electrolysis of KI in water
Red: 2 H2O + 2 e- --> H2 + 2 OH-
2 H2O + 2 I- --> H2 + 2 OH- + I2
Electrolysis of KI in water. (H2O has a E°red closer to zero than K+)
Which of the following elements has the greatest number of p electrons?
Even though some of the others have more p electrons in their OUTER shell, Arsenic has more TOTAL p electrons.
An electron with the four quantum numbers 3,2,-1,-1/2 may be an electron in an unfilled sublevel of . . .
It says UNFILLED sublevel. Since the 1st two quantum #’s are “3” and “2” that means an unfilled 3-d orbital. Fe is the only one with an unfilled 3-d orbital.
Chemical Properties are defined by the:
A) Electrons C) Neutrons
B) Protons D) Ionization Energy
The best way to estimate the boiling points of Pd is to:
A) average the b.p.’s of Rh and Ag
B) average the b.p.’s of Ni and Pt
C) average the b.p.’s of Ir and Cu
D) average the b.p.’s of Co and Au
E) None of the above will work.
In which of the following pairs of elements is the element with the lower boiling point listed first?
A) Na, Cs D) Ba, Sr
B) Te, Se E) I, Br
C) P, N
Carbon-14 has a half-life of 5730 years. How old is a wooden object if 70% of the C-14 has decayed?
A) 2948 yr D) 4321 yr
B) 1280 yr E) 7002 yr
C) 9950 yr
Rate = kX
ln Xo = kt
Ln 2 X = k t 1/2
ln 2 = k t 1/2==> t 1/2 = 0.693/k
An electron that falls from a higher energy level to n=3 emits a wavelength that fall in what “series?”
Balmer: n = ∞ --> n = 2
Paschen: n = ∞ --> n = 3