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Chemistry States of Matter Blizzard Bag 2014 - 2015
1. K2SO4(aq) + Pb(NO3)2(aq) --> PbSO4(s) + 2 KNO3(aq)
What pair of terms best describes the reaction described above?
I. exchange reaction
II. precipitation reaction
III. acid-base reaction
IV. combustion reaction
A. II and III
B. I and II
C. II and IV
D. I and IV
E. I and III
2. The specific heat of ice is 2.09 J/g-K, and the molecular weight of water is 18.0 g/mol.
A scientist wants to calculate the enthalpy change in 2.0 mol (36.0 g) of ice when its
temperature is raised from −6ºC to 50ºC. This change involves ice melting.
What additional information about water is needed for the calculation?
I. the density change of ice when it melts
II. the specific heat of liquid water
III. the heat of fusion (ΔHfus) of water
IV. the melting point of ice
A. I, II, III, and IV
B. III and IV only
C. II, III, and IV only
D. II and IV only
E. II and III only
3. By bonding to which of the following ions will the phosphate ion (PO 43-) precipitate out of
solution?
I. sodium ion (Na+)
II. ammonium ion (NH4+)
III. lead ion (Pb2+)
A. I, II, and III
B. III only
C. II only
D. I and III only
E. II and III only
4. 2 Fe(NO3)3(aq) + 3 Zn(s) → 3 Zn(NO3)2(aq) + 2 Fe(s)
The reaction described by the equation shown above is an example of a(n) _______ in which
zinc (Zn) is ______.
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A.
acid-base reaction; reduced
B.
displacement reaction; oxidized
C.
exchange reaction; oxidized
D. displacement reaction; reduced
E.
acid-base reaction; neutralized
5. The unbalanced chemical equation for the oxidation of zinc sulfide is shown below. Blanks
are used to indicate where coefficients should be placed.
___ ZnS (s) + __ O2 (g) → ___ ZnO (s) + __ SO2 (g)
What is the most logical first step to balance this equation?
A.
Balance the oxygen atoms by placing a coefficient of 1 in front of their compounds in the
equation.
B.
Balance the solids, and then balance the gases.
C.
Balance the zinc and sulfur atoms by placing a coefficient of 1 in front of their compounds
in the equation.
D. Balance the gases, and then balance the solids.
E.
Balance the oxygen atoms by placing a coefficient of 0 in front of zinc oxide (ZnO).
6. Gasoline is described as a volatile liquid because it...
A. evaporates at a slow, steady rate.
B. evaporates quickly.
C. burns easily.
D. boils at a low temperature.
E. releases a lot of energy when it burns.
7. A chemist has 60 mL of a 0.25 molar solution of potassium chloride(KCl). If he boils away the
water, how much potassium chloride can he recover? (The molar mass of potassium chloride is
74.5 g/mol.)
A. 1.9 g
B. 4.9 g
C. 2.3 g
D. 1.1 g
E. 0.76 g
8. The boiling point of a molecular compound depends on the strength of...
A. the covalent bonds within the molecules.
B. forces within atomic nuclei in molecules.
C. forces among inner core electrons within the molecule.
D. the ionic bonds within the molecules.
E. intermolecular forces.
9. A chemist has measured the percent composition by mass of the elements in a compound.
His measurements are
carbon: 40.0%
oxygen: 53.3%
hydrogen: 6.7%
Which of the following could be the molecular formula of the compound?
(Assume the atomic weight of carbon is 12.0 amu, of oxygen is 16.0 amu, and of hydrogen is 1.0
amu.)
I. formic acid (H2CO)
II. glucose (C6H12O6)
III. lactic acid (C3H6O3)
IV. acetic acid (CH3CO2H)
A. II and III only
B. I and II only
C. I, II, and IV only
D. I only
E. I, II, III, and IV
10. Carbon dioxide, a nonpolar molecule, can exist in both the liquid and solid state. The reason
is because of...
A. dipole-dipole forces.
B. London dispersion forces.
C. intramolecular forces between carbon and oxygen atoms.
D. nuclear forces.
E. bonds among inner core electrons.
11. Listed below are molecular formulas for several compounds. In which pair of compounds
are the percent compositions of the component elements identical?
A. CO2 and H2CO
B. C2H6O and C2H2O
C. C3H6O2 and C3H6O
D. C3H6O3 and C4H8O4
E. C3H8 and C6H16O
12. Consider the chemical equation below.
2 Al (s) + 3 Cl2 (g) → 2 AlCl3 (s)
What do the numbers before the chemical formulas (2, 3, and 2) indicate?
A. the relative volumes of the compounds
B. the relative molar masses of the compounds
C. the number of atoms in each compound
D. the molar ratio in which the compounds combine and form
E. the number of moles of each compound that are present during the reaction
13. How can you make a liquid boil without raising its temperature?
A. move the liquid to a wider, more shallow container
B. thoroughly mix air into the liquid, such as by blowing through a straw
C. raise the pressure of the air surrounding it
D. lower the pressure of the air surrounding it
E. thoroughly mix a solid substance, such as salt or sugar, into the liquid
14. The chemical equation for a reaction is shown below.
AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3 (aq)
Which substance plays a key role in this reaction, but is neither a reagent nor a product?
A. water (H2O)
B. oxygen (O2)
C. silver nitrate (AgNO3)
D. sodium metal (Na)
E. sodium chloride (NaCl)
15. X(s) + Sn2+(aq) → X2+(aq) + Sn(s)
A chemist wants to reduce tin ions (Sn2+) to elemental tin (Sn). To accomplish this, she proposes
to react the tin with another metal, identified in the equation above as X.
Which of the following elements could be X? (Note: Each of the elements in the answer choices
commonly forms ions of charge 2+).
I. barium (Ba), an alkali earth metal
II. calcium (Ca), an alkali earth metal
III. platinum (Pt), a transition metal
A. I, II, and III
B. I and II only
C. III only
D. I only
E. II only