Name: 
 

2005 Chemistry



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

How many valence electrons does a neutral atom of silicon have?
a.
3
c.
5
b.
4
d.
6
 

 2. 

The correct name for P2O5 is —
a.
phosphorus (V) pentoxide
c.
phosphorus (II) oxide
b.
phosphorus oxide
d.
diphosphorus pentoxide
 

 3. 


mc003-1.jpg
What mass of potassium hydroxide is required to react completely with 2.70 g of sulfuric acid to produce potassium sulfate and water?
a.
4.73 g
c.
2.36 g
b.
3.09 g
d.
1.54 g
 

 4. 

Which of the following best describes sublimation?
a.
A solid melting to a liquid
c.
The movement of gaseous particles so
that they fill the space they occupy
b.
A solid melting to a liquid, which then
evaporates
d.
A solid forming a gas
 

 5. 

The reaction times for three trials of an experiment are 90.3, 90.2, and 90.5 seconds. Which average time is expressed using the correct number of significant figures?
a.
90.3
c.
90
b.
90.33
d.
90.333
 

 6. 


mc006-1.jpg
Which set of coefficients will balance this equation?
a.
1, 3, 1, 1
c.
2, 6, 2, 3
b.
2, 3, 2, 6
d.
3, 6, 3, 2
 

 7. 

At room temperature, chlorine exists as a gas, bromine exists as a liquid, and iodine exists as a solid. The physical states of these elements indicate that melting point —
a.
decreases from top to bottom with group
17 elements
c.
increases from top to bottom within
group 17 elements
b.
is independent of periodic position
d.
is constant within group 17 elements
 

 8. 


mc008-1.jpg
Using the table above, what is the correct formula for ammonium phosphate?
a.
NH4PO4
c.
(NH4)3PO4
b.
(NH4)2(PO4)3
d.
NH4(PO4)3
 

 9. 


mc009-1.jpg
Which represents an atom of calcium?
a.
1
c.
3
b.
2
d.
4
 

 10. 


mc010-1.jpg
What is the name of the lab equipment shown above?
a.
Watch glass
c.
Beaker
b.
Crucible
d.
Evaporating dish
 

 11. 

A scientist has found the following isotope of oxygen:
mc011-1.jpg
How many neutrons are present in this isotope?
a.
8
c.
19
b.
11
d.
27
 

 12. 

The melting point of a white solid substance was determined in four repeated trials to be 56.0C, 55.0C, 57.5C, 55.5C. What temperature should be reported as the melting point as a result of these trials?
a.
55.0C
c.
56.0C
b.
55.5C
d.
57.5C
 

 13. 

Which half-reaction represents reduction?
a.
mc013-1.jpg
c.
mc013-3.jpg
b.
mc013-2.jpg
d.
mc013-4.jpg
 

 14. 


mc014-1.jpg
Which is the best indicator for giving a color change at the equivalence point?
a.
Bromocresol green
c.
Neutral red
b.
Indigo carmine
d.
Phenolphthalein
 

 15. 

mc015-1.jpg
If 6 liters of hydrogen gas are used, how many liters of nitrogen gas will be needed for the above reaction at STP?
a.
2 liters
c.
4 liters
b.
3 liters
d.
12 liters
 

 16. 

Which of the following best represents the reaction between hydrochloric acid and sodium hydroxide?
a.
mc016-1.jpg
c.
mc016-3.jpg
b.
mc016-2.jpg
d.
mc016-4.jpg
 

 17. 

The freezing point and the boiling point of water can be altered by a variety of techniques. Which of the following has little or no effect on the boiling point of water?
a.
Increasing the air pressure above the
liquid
c.
Adding sodium chloride to the water
b.
Adding alcohol to the water
d.
Increasing the amount of water
 

 18. 

Formaldehyde (H2CO) reacts with oxygen to form CO2 and H2O. How many moles of CO2 will be produced from reacting 2 moles of H2CO with oxygen?
a.
1
c.
4
b.
2
d.
8
 

 19. 


mc019-1.jpg
Which pair of solutions would be acidic if mixed in equal quantities?
a.
A and B
c.
B and D
b.
B and C
d.
C and D
 

 20. 

The elements that are characterized by the presence of an incomplete d sublevel are called —
a.
transition elements
c.
halogens
b.
alkali earth metals
d.
lanthanoids
 

 21. 


mc021-1.jpg
Standard atmospheric pressure is 101.3 kPa. According to the graph, which of these four liquids boils at the lowest temperature?
a.
1
c.
3
b.
2
d.
4
 

 22. 

The net charge on an aluminum ion is 3 because there are —
a.
10 protons and 13 electrons in the atom
c.
10 neutrons and 13 electrons in the
atom
b.
13 protons and 10 neutrons in the
nucleus
d.
13 protons and 10 electrons in the atom
 

 23. 

The type of formula that shows the arrangements of atoms and bonds is
called —
a.
empirical
c.
molecular
b.
chemical
d.
structural
 

 24. 


mc024-1.jpg
Methyl mercury, found in some stream sediments, is highly toxic to animal life. Using the graphed results of the study shown, the best analysis of the data reveals that the methyl mercury concentration in the stream sediment is —
a.
steadily increasing, accelerating in the
fall of each year
c.
constantly declining throughout each
month of the year
b.
increasing overall but reaches a
minimum in the winter
d.
decreasing but reaches a maximum at
the end of summer
 

 25. 

Which of the following is a mixture?
a.
Carbon
c.
Distilled water
b.
Glucose
d.
Air
 

 26. 


mc026-1.jpg
What is the mole ratio of C4H10 to CO2 in the reaction shown?
a.
1:4
c.
4:5
b.
2:13
d.
13:8
 

 27. 

One indicator that electrons in atoms are limited to specific energy levels is
that —
a.
atoms move faster when heated
c.
the Doppler effect shows a shift in
wavelength for H-atom light
b.
the light given off by atoms is all at the
same wavelength
d.
light emitted from excited atoms occurs
only at specific wavelengths
 

 28. 


mc028-1.jpg
Between points 2 and 3, energy is being used to —
a.
melt ice
c.
evaporate water
b.
heat water
d.
heat water vapor
 

 29. 

A container holds 20.0 grams of neon gas. Under the same conditions, how
many grams of xenon would the container hold?
a.
108 g
c.
262 g
b.
131 g
d.
370 g
 

 30. 


mc030-1.jpg
In the combustion of ethane, how many moles of CO2 can be produced from 1.00 mole of C2H6?
a.
0.500 mole
c.
2.00 moles
b.
1.00 mole
d.
4.00 moles
 

 31. 

What is the molecular formula of a substance that has an empirical formula of C2H5 and a molecular mass of 58 g/mole?
a.
C2H5
c.
C4H10
b.
C5H2
d.
C6H15
 

 32. 

According to Boyle’s law, the relationship between the pressure and volume of a gas at constant temperature is —
a.
numerically equivalent
c.
positively correlated
b.
inversely proportional
d.
totally unrelated
 

 33. 


mc033-1.jpg
Which is the base in the reaction?
a.
H2O
c.
K+
b.
KOH
d.
H2SO4
 

 34. 

Charles’ Law states that if a given quantity of gas is held at a constant pressure, then its volume is directly proportional to the absolute temperature. This law explains why —
a.
the pressure of a gas increases when
volume decreases
c.
solids require heat in order to change
into gases
b.
a gas-filled balloon expands when it is
heated
d.
some gases only react with each other at
high temperatures
 

 35. 

What is a possible cause of a large percentage of error in an experiment where MgO is produced from the combustion of magnesium?
a.
Not all of the Mg has completely
reacted.
c.
The students were careful in their
measurements.
b.
The same balance was used throughout
the experiment.
d.
The students were careful not to spill
the contents.
 

 36. 


mc036-1.jpg
Which type of reaction is represented here?
a.
Single replacement
c.
Synthesis
b.
Double replacement
d.
Decomposition
 

 37. 

The amount of energy needed to raise
one gram of a substance one degree
Celsius is a characteristic property
known as —
a.
heat of formation
c.
molar heat of fusion
b.
heat of vaporization
d.
specific heat capacity
 

 38. 

The empirical formula for C6H12 is —
a.
C3H6
c.
CH3
b.
C2H4
d.
CH2
 

 39. 


mc039-1.jpg
Which condition will cause a shift in the equilibrium of the above reaction?
a.
Double the concentration of reactants
and products
c.
Reduce the concentration of products
and reactants by 10%
b.
Increase the reaction temperature
d.
Keep the reaction temperature constant
 

 40. 

mc040-1.jpg
Which completes the chemical equation above?
a.
O2
c.
ClO
b.
O3
d.
ClO2
 

 41. 


mc041-1.jpg
An alien astronaut landed on Earth and created the periodic table shown. The astronaut was trying to determine what type of bond would be present in several compounds. The type of bond in a compound containing G and E would be —
a.
a metallic bond
c.
a covalent bond
b.
a nonmetallic bond
d.
an ionic bond
 

 42. 


mc042-1.jpg
The volume of Object X is
approximately —
a.
20 mL
c.
30 mL
b.
25 mL
d.
35 mL
 

 43. 


mc043-1.jpg
Calcium carbonate was placed in a flask on a balance, and dilute hydrochloric acid was added. Carbon dioxide that was produced escaped from the flask. The total mass of the flask and its contents was recorded every 10 seconds. The diagram above
shows a plot of the results. Between which of the following times was the reaction the fastest?
A

B
C
D
a.
0 and 10 seconds
c.
20 and 30 seconds
b.
10 and 20 seconds
d.
30 and 40 seconds
 

 44. 

How many liters are equivalent to five milliliters?
a.
0.005 L
c.
500 L
b.
0.05 L
d.
5000 L
 

 45. 

The following data were collected. The volume of the gas is known to be
2.20 L.
mc045-1.jpg

This data reflects —
a.
low precision and low accuracy
c.
low accuracy and high precision
b.
low precision and high accuracy
d.
high accuracy and high precision
 

 46. 

The total pressure of an O2-Ar-He gas mixture is 755 mmHg. If the partial
pressure of Ar is 174 mmHg and the partial pressure of He is 389 mmHg,
then the partial pressure of O2 is —
a.
192 mmHg
c.
366 mmHg
b.
282 mmHg
d.
563 mmHg
 

 47. 

Bonding between two elements of equal electronegativity would be —
a.
100% covalent
c.
50% ionic
b.
primarily ionic
d.
metallic in character
 

 48. 

The molar mass (gram formula mass) for the compound sodium thiosulfate,
Na2S2O3, is—
a.
71 grams
c.
158 grams
b.
153 grams
d.
254 grams
 

 49. 

The correct formula for copper (I) bromide is —
a.
CuBr
c.
Cu2Br
b.
CuBr2
d.
Cu2Br3
 

 50. 

Which of the following models a synthesis reaction?
a.
mc050-1.jpg
c.
mc050-3.jpg
b.
mc050-2.jpg
d.
mc050-4.jpg
 



 
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