Chemistry 106: General Chemistry
Syracuse University Project Advance
Fall 2008 Exam #1
Name
(1)
Date
Which one of the following is an extensive property?
(a) density
(b) mass
(c) boiling point
(d) freezing point
(e) all are extensive properties
Answer: B
(2)
Consider a mixture of sand, salt and water. This mixture could be separated into its three
components by first
the mixture and then
the remaining mixture.
(a)
(b)
(c)
(d)
(e)
(3)
Answer: C
Platinum has a density of 21.4 g/cm3. What is the mass of 5.9 cm3 of this metal? (express
correctly the number of significant figures in your answer)
(a)
(b)
(c)
(d)
(e)
(4)
distilling, distilling
distilling, filtering
filtering, distilling
filtering, filtering
not possible using these techniques (requires chromatography).
0.276 g
1.3 x 102 g
126. g
3.6 g
3.63 g
Answer = B
The number of significant figures in the mass measured as 0.05010 is
(a) 1 (b) 2 (c) 3 (d) 4 (e) 5
Answer = D
(5)
A solution is a
a) pure mixture
b) heterogeneous mixture
c.) pure element
d) homogeneous mixture
e) pure compound
Answer = D
(6)
The melting point and the normal boiling point of water can be used to calibrate
thermometers. What are these respective temperatures in Kelvin degrees?
a)
b)
c.)
d)
e)
32 and 212
0 and 100
100 and 273
0 and 373
273 and 373
Answer = E
(7)
Which of the statements I-V is (are) correct?
I.
II.
III.
IV.
V.
(a)
(b)
(c)
(d)
(e)
(8)
Barium Nitrate is Ba(NO3)2
Calcium carbonate is CaCO3
Sodium perchlorate is NaClO4
Lithium carbonate is Li2CO3
KNO3 is potassium nitrate
all are correct
all except IV
II and IV only
I, II, and III only
none is correct
Answer: A
The species 11H, 21H and 31H represent three
(a)
(b)
(c)
(d)
(e)
allotropes
homologs
isomers
isotopes
members of an homologous series
Answer: D
(9)
A sodium ion differs from a sodium atom in that the sodium ion
(a)
(b)
(c)
(d)
(e)
(10)
is more reactive
has fewer electrons
is an isotope of sodium
exists only in solution
has a negative charge on the nucleus
Answer: B
When alpha particles were shot at a gold target, most of the particles were undeflected.
This indicated to Rutherford that
(a) the gold foil was continuous matter
(b) the mass of the gold atoms was spread out thinly and the electron carried the
negative charge
(c) the atoms of gold were mostly empty space
(d) the alpha particles had great penetrating power and the nucleus has a positive
charge
(e) the alpha particles had charges opposite to those on the gold nuclei
Answer: C
(11)
(12)
and
reside in the atomic nucleus
(a) protons, electrons
(b) protons, neutrons
(c) neutrons, electrons
(d) none of these
Answer = B
Which one of the following formulas is also an empirical formula?
(a) C6H6O2
(b) C2H6SO
(c) H2O2
(d) H2P4O6
(e) C6H6
Answer = B
(13) Magnesium reacts with a certain element to form a compound with the general formula
MgX. What would be the most likely formula for the compound formed between potassium
and element X?
(a) K2X
(b) KX2
(c) K2X3
(d) K2X2
(e) potassium and X cannot form a compound
Answer = A
(14)
The species formed when a neutral atom loses an electron is called
(a) an anion.
(b) a cation.
(c) an isotope.
(d) a charge mass ratio.
(e) an isomer.
Answer = B
(15) What is the sum of the coefficients for the following chemical reaction when it is
balanced?
____ Al + ____ Fe3O4  ____ Al2O3 + ____ Fe
a.
b.
c.
d.
e.
9
16
17
24
none of the above
Answer = D
(16) The composition of oxalic acid is 26.7% carbon, 2.2% hydrogen and 71.1% oxygen, by
mass. What is the empirical formula of oxalic acid?
A
b.
c.
d.
e.
CHO2
CHO
C2HO4
C2HO2
none of the above
Answer = A
(17) Which combination represents a
a)
b)
c.)
d)
e)
57p, 26n, 54e
26p, 31n, 29e
26p, 31m, 26e 
57p, 26n, 23e
26p, 31n, 23e
Answer = E
57
26
Fe 3+ ion?
(18) A certain element has two naturally occurring isotopes. These isotopes have mass
numbers of 63 and 65, and their fractional abundances are, respectively, 0.692 (69.2%) and
0.308 (30.8%). What is the atomic weight (or atomic mass) of this element?
a)
b)
c.)
d)
e)
58.7
63.1
63.6
64.4
65.4
Answer = C
(19)
According to the following balanced reaction, how many moles of
manganese(II) chloride can be produced when 1.83 g of HCl gas completely reacts with
manganese(IV) oxide?
MnO2(s) + 4 HCl(aq) ------> Cl2(g) + MnCl2(g) + 2H2O(l)
(a)
(b)
(c)
(d)
(e)
(20)
0.0125 moles
1.577 moles
0.010 moles
0.00313 moles
none of these
Answer: A
When the reaction below is correctly balanced, the coefficients are
NH3 + O2 ------> NO2 + H2O
(a)
(b)
(c)
(d)
(e)
1,1,1,1
4,7,4,6
2,3,2,3
1,3,1,2
none of these
Answer: B
(21)
How many aluminum atoms are there in 25 g of Al2S3?
(a)
(b)
(c)
(d)
(e)
1.0 x 1023
2.0 x 1023
4.5 x 1023
4.0 x 1021
6.0 x 1021
Answer = B
(22) What is the percentage of mass of oxygen in vanillin, C8H8O3, which is used as a
flavoring?
(a)
(b)
(c)
(d)
(e)
27.3%
31.6%
45.8%
63.2%
68.4%
Answer = B
Questions (23) and (24). Consider the following reaction:
4KO2(s) + 2H2O(l)  4KOH(s) + 3O2(g)
The reaction vessel initially contains 0.25 mol KO2 and 0.15 mol H2O.
(23)
Which is the limiting reactant?
a)
b)
c)
d)
e)
KO2
H2O
KOH
O2
cannot be determined from the given data
Answer = A
(24)
How many moles of O2 can be produced?
a)
b)
c)
d)
e)
0.22 mol
0.19 mol
0.25 mol
0.15 mol
0.39 mol
Answer = B
(25) A compound has an empirical formula of CH2 and a molecular weight of 56.06 amu.
Calculate the molecular formula of the compound:
a)
b)
c.)
d)
e)
CH2
C3H6
C2H4
C5H10
C4H8
Answer = E
(26)
What is the molarity of sodium hydroxide (NaOH, molar mass = 40.01 g) solution made
by dissolving 57.2 g of NaOH in 250 mL of water?
(a)
(b)
(c)
(d)
(e)
0.1092 M
2.80 M
14.3 M
6.99 M
5.72 M
Answer: E
(27)
When a 25.0 mL sample of HNO3(aq) was titrated with 0.101 M NaOH(aq), the
stoichiometric point was reached when 41.2 mL of the base had been added. What is the
concentration of HNO3(aq) in the sample?
(a)
(b)
(c)
(d)
(e)
0.166 M
0.00416 M
0.104 M
0.101 M
0.332 M
Answer: A
(28)
The balanced net ionic equation for the precipitation of CaCO3 when aqueous solutions
of Li2CO3 and CaCl2 are mixed is
(a)
(b)
(c)
(d)
(e)
2 Li+(aq) + CO32-(aq) ------> Li2CO3(aq)
2 Li+(aq) + 2 Cl-(aq) ------> 2 LiCl(aq)
Li+(aq) + Cl-(aq) ------> LiCl(aq)
Ca2+(aq) + CO32-(aq) ------> CaCO3(s)
Li2CO3(aq) + CaCl2(aq) ------> 2 LiCl(aq) + CaCO3(s)
Answer: D
(29)
What are the respective molar concentrations of Na+ and SO42- afforded by dissolving
0.500 moles of Na2SO4 in water and diluting it to 1.33 L?
(a)
(b)
(c)
(d)
(e)
0.665 and 0.665
0.665 and 1.33
1.33 and 0.665
3.76 and 7.52
0.752 and 0.376
Answer: E
(30)
What is the oxidation number of Mn in KMnO4?
(a)
(b)
(c)
(d)
(e)
-3
0
+3
+7
+5
Answer =D
EC)
The combustion of 3.42 g of a compound known to contain only nitrogen and hydrogen
was burned in oxygen. The result was the formation of 9.82 g of NO2 and 3.85 g of
water. Determine the empirical formula of this compound. SHOW ALL WORK
(a)
(b)
(c)
(d)
(e)
NH
NH2
N2H
NH3
N2H4
Answer: B