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Chemistry 2
Chapter 5 Practice Test
Name: ____Pedro Colli____
Date: __________________________
For problems, be sure to show all work, include correct units, and round off
carefully. (10 points each)
1)
To produce the most voltage in a battery, the two metals used for the
electrochemical cell should be _further apart_______ on the “activity series”.
An electrochemical cell is made using Lead, in a Lead Nitrate solution, and Sodium in a
Sodium Nitrate solution. The reaction is shown below. Use this combination to answer
questions 2, 3 and 4 .
Na(s) + Pb+2(aq) → Na+2(aq) + Pb(s)
2)
In the space below, write the correct half reaction for copper.
3)
For this cell, Lead is the _________________ , and __________________ occurs
there.
a) anode, oxidation
b) anode, reduction
c) cathode, oxidation
d) cathode, reduction
4)
For this cell, Sodium is the ________________ side of the cell, and magnesium is
____________________ electrons.
a) negative, gaining
b) negative, losing
c) positive, gaining
d) positive, losing
5)
If three 1.5 volt “D” cells are connected is series, the total voltage produced will be
_____4.5____________ volts.
6)
Alcohols are generally _____non____ polar than their corresponding (same number
of carbon atoms) alkanes, and therefore tend to have ________lower_____ boiling
points.
7)
Symmetric molecules such as the “diatomic halogens” (F2, Cl2, Br2 etc.) tend to be
_________alcohols______ , and their boiling points tend to increase as they get
__________bigger________ .
8)
The weak, attractive, intermolecular forces between momentary dipoles formed in
non - polar molecules are called __________________dispersion
forces____________ .
9)
In a polar water (H2O) molecule, the oxygen side of the molecule is more
__________positive________ than the hydrogen side, because oxygen has a
___________weaker_______ electronegativity than hydrogen.
10) For a given substance, intermolecular forces tend to be strongest in the
____________solid___________ state (phase) of that substance.
11) In the space below, write “Boyle’s Law”. Be very specific and complete!
For a given amount of gas at a constant temperature, the volume of the glass varies
inversely with its pressure
12) Pressure is defined as _______force applied over a certain area________________ .
13) If the absolute pressure on a fixed amount of gas, at constant temperature, is
doubled, the volume will _______________decrease_____________ .
14) If 2.5 liters of gas in a balloon at an absolute pressure of .5 atm is allowed to expand
at constant temperature to 2.0 liters, what will the new absolute pressure be?
.4
15) A gauge on a 2 liter tank reads a pressure of 43 psi on a day when the atmospheric
pressure is 14 psi. If all of the helium in the tank is used to fill a balloon to an
absolute pressure of 18 psi, at constant temperature, what is the volume of the
balloon?
16) Convert a temperature of 30°C to an equal temperature on the Kelvin scale.
303 k
17) In the space below, write “Charles’s Law”. Be very specific and complete!
The volume of a gas varies directly with the temperature in kelvin, for a given amount of
gas at a constant pressure
18) If the absolute temperature of a fixed amount of gas, at constant pressure, is
doubled, the volume will _____________increase_____________ .
19) If 5 liters of a fixed amount of gas with an initial temperature of 35°C is heated to
225°C at constant pressure, what will the new volume be?
20.4
20) A plastic bag holds 20 liters of gas at a temperature of 200 Kelvin. To what Kelvin
temperature must it be heated, at constant pressure, to have a volume of 120 liters?
1,236