Transcript AP Chemistry Jeopardy

AP Chemistry Jeopardy
2000
AP CHEM JEOPARDY
Structure
States of
Physical
Chemical
Chemical
of Matter
Matter
Chemistry
Bonding
Reactions
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Chemical Bonding $100B
DAILY DOUBLE
Chem Bond $100
Q - Which atom has a larger
atomic radius?
A) Ar
C) Cl
B) Na
D) Li
Chem Bond $200
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
Chem Bond $400
What are the the three atoms that
bond to hydrogen in hydrogen
bonding?
Nitrogen
Oxygen
Fluorine
Chem Bond $800
What are the two ways for a
molecule to have a bent geometry?
A tetrahedral arrangement with two
unshared electron pairs (~109.5°)
A planar triangle geometry with one
unshared electron pair (~120°)
Chem Bond $1000
What are the four types of Unit Cells
possible for crystal structures??
Simple Cubic
2r = s
Face centered
4r = 2 (
r)
Body centered 4r = s (
r)
sqr. Root
cube root
Hexagonal
Chem Bond $1500
Q - Which is NOT linear?
a) CO2
b) H2O
c) BeF2
d) N2
A
Chem Bond $2000
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
States of Matter $100
Which of the following is not
a gas at room temperature?
A) O2
B) Ar
C) F2
D) Br2
Bromine is
a red liquid
States of Matter $200
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
and 25°C
D) the solid phase must be more dense than the liquid phase
States of Matter $400
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 ? . . . .
A) T x (1/3)(1/2)(1/4)
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)
Temp. is tripled P = kT
Volume is doubled
P=k(1/V)
Moles is quad. P = kn
States of Matter $800
Is the slope for the solid/
liquid line in the phase
diagram of water positive,
negative, or can be either?
States of Matter $1000
The kinetic molecular theory
predicts that at a given
temperature...
A) All gases have the same KE
B) All gas molecules have the same
velocity
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.
States of Matter $1500
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
States of Matter $2000
Which of the following is most
likely to be soluble in hexane?
A) KCl
D) H2O
B) C2H5OH
E) C6H6
C) HC2H3O2
Physical Chemistry $100
What is the free
energy of a system at
equilibrium? . . .
∆G
= 0 @ equilibrium
< 0 if spontaneous
> 0 if non-spontaneous
Physical Chemistry $200
When ∆H is positive and ∆S is
negative, will temperature
changes have an effect on the
spontaneity of a reaction?
YES
NO
Physical Chemistry $400
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
Physical Chemistry $800
The Law of Dulong and Petit says
that the molar specific heat of
solid elements is approximately 25
J/mol•K. This suggests that. . .
a) The heat absorbed depends only on the
number of atoms
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
Physical Chemistry $1000
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.
Physical Chemistry $1500
What equation would you use
to solve:
How much heat does it take to
raise 10 grams of water by
10°C? . . .
q = m • c • ∆T
Physical Chemistry $2000
What is the equation is used
to find how temperature
changes affect rates of
reaction?
ln k2 = Ea (T2 - T1)
k1
R
T2•T1
Chemical Reactions $100
Which of the following would
produce odor if heated?
A) NH3
D) PbI2
B) Na+(aq)
E) A and C
C) KI
Chemical Reactions $200
One mole of electrons is
how many coulombs?
96,485 C
Chemical Reactions $400
A molecule of NaHSO4 is . . .
a) Acidic
b) Basic
c) Neutral
Na+ is neutral because it is the
conjugate acid of a strong base.
HSO4- is acidic because it can
further produce H+ ions in solution
(but it also has amphoteric
properties).
Chemical Reactions $800
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
C) Al(NO3)3
Chemical Reactions $1000
DAILY DOUBLE
Which of the following statements
is FALSE?
A) reduction involves a gain of eB) 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
Chemical Reactions $1500
What will be the products of the
following equation?
FeCl2 + HCl + KMnO4 -->
???
FeCl2 + HCl + KMnO4 -->
FeCl3 + MnCl2 + H2O + KCl
Ox: Fe2+ --> Fe3+ + e-
Red: MnO4 - + H+ --> Mn2+ + H2O
(K+ and Cl- are spectator ions)
Chemical Reactions $2000
Predict the net ionic equation for
the following reaction and tell
what form the reactants will be
present . . .
The electrolysis of KI in water
Ox: 2 I-
--> I2 + 2e-
Red: 2 H2O + 2 e- --> H2 + 2 OH2 H2O + 2 I- --> H2 + 2 OH- + I2
Electrolysis of KI in water. (H2O
has a E°red closer to zero than K+)
Structure of Matter $100
Which of the following
elements has the
greatest number of p
electrons?
A) C
B) Si
C) Fe
D) Cl
E) As
Even though some of the
others have more p
electrons in their OUTER
shell, Arsenic has more
TOTAL p electrons.
Structure of Matter $200
An electron with the four
quantum numbers 3,2,-1,-1/2
may be an electron in an
unfilled sublevel of . . .
A) Ca
B) Fe
C) Al
D) Ar
E) Ag
B) Fe
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.
Structure of Matter $400
Chemical Properties are
defined by the:
A) Electrons
B) Protons
C) Neutrons
D) Ionization Energy
C) Electronegativity
Structure of Matter $800
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.
Structure of Matter $1000
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
States of Matter $1500
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
Radioactive decay is a first
order reaction therefore…
Rate = kX
ln Xo = kt
X
Ln 2 X = k t 1/2
X
ln 2 = k t 1/2 ==> t 1/2 = 0.693/k
Structure of Matter $2000
An electron that falls from a
higher energy level to n=3
emits a wavelength that fall in
what “series?”
Paschen Series
Lyman: n = ∞ --> n = 1
Ultraviolet
Balmer: n = ∞ --> n = 2
Visible
Paschen: n = ∞ --> n = 3
Infrared