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Chemistry Olympics Quiz Part One

Total questions: 17

Worksheet time: 34mins

Name
Class
Date
1.
The element with the ground state electron configuration of [Ar]3d74s2 is
a)
Mg
b)
K
c)
Ar
d)
Co
2.
Small drops of water tend to bead up because of
a)
high capillary action.
b)
the shape of the meniscus.
c)
the resistance to increased surface area.
d)
low London dispersion forces.
3.

Temperature is often given with Ksp values because

a)

the solubility of solids always increases with increasing temperature.

b)

the solubility of solids varies with temperature changes.

c)

solubility changes with temperature buy Ksp values do not.

d)

the number of ions varies with the kind of salt that is dissolving.

4.

All of the following statements concerning voltaic cells are true except

a)

the half-cells must be connected with a salt bridge for a current to flow.

b)

electrons flow from the oxidation half cell to the reduction half cell.

c)

the mass of the oxidation electrode (anode) will increase as current flows.

d)

voltaic cells can be used as a source of energy.

5.
Atomic radii decrease from left to right across a period because of
a)
an increase in the effective nuclear charge.
b)
an increase in the gross energy level (n).
c)
an increase in the sublevel (l).
d)
an increase in shielding.
6.
The compound most likely to be ionic is
a)
KF
b)
CCl4
c)
CO2
d)
ICl
7.
The total number of lone pairs in PCl3 is
a)
1
b)
8
c)
10
d)
12
8.
When a salt dissolves in water, the solute-solvent interaction is
a)
hydrogen bonding.
b)
London dispersion forces.
c)
dipole-dipole forces.
d)
ion-dipole forces.
9.
A triple bond is comprised of
a)
three sigma bonds.
b)
two sigma bonds and one pi bond.
c)
one sigma bond and two pi bonds.
d)
three pi bonds.
10.
A reaction mechanism
a)
is the sum of all steps in a reaction except the rate determining step.
b)
always has a rate determining step.
c)
may absolutely be proven from the rate law.
d)
is determined from the balanced equation only.
11.
The oxidation number of N in Ca(NO3)2 is
a)
+2
b)
+3
c)
+4
d)
+5
12.
A compound of nitrogen and oxygen is 63.64% nitrogen by mass. What is the empirical formula of this compound?
a)
NO
b)
NO2
c)
NO3
d)
N2O
13.
Nitrogen gas diffuses through a porous barrier at the rate of 5.80 liters per minute. An unknown gas under the same conditions diffuses through the same barrier at a rate of only 1.80 liters per minute. What is the molar mass of the unknown gas?
a)
291
b)
145
c)
90.3
d)
50.3
14.

The geometry of the SO3 molecule is best described as

a)

trigonal planar.

b)

pyramidal.

c)

see-saw.

d)

square pyramidal.

15.

At 20°C, the vapor pressure of toluene is 22 mmHg and that of benzene is 75 mmHg. An ideal solution, equimolar in toluene and benzene, is prepared. At 20°C, what is the mole fraction of benzene in the vapor in equilibrium with this solution?

a)

0.23

b)

0.29

c)

0.50

d)

0.77

16.

100.0 mL of 1.0 M HCl is combined with 200.0 mL of 0.75 M NaOH. What is the pH of the solution?

a)

0.167

b)

0.77

c)

10.5

d)

13.2

17.

A weak base (Kb = 1×10-5) is titrated with a strong acid. The equivalence point is reached at 45.0 mL of strong acid. What is the approximate after 25.0 mL of strong acid have been added.

a)

4.5

b)

5.5

c)

8.5

d)

9.5

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