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CHM 101
GAGE
SPRING 2003
1.
NAME ____________________________
SECTION ________________________
EXAM 2
Use the following equation to answer the questions that follow.
C4H10O
+
6 O2
--------------> 4 CO2
+ 5 H2O
∆H = -2713 kJ
a.
How many grams of water will be produced if the reaction is conducted with 75.6
g of C5H12O and 95.5 g of oxygen?
(10)
b.
How many molecules of oxygen are required to form 24.0 g of water based on the
above reaction?
(5)
c.
How much energy is exchanged when 30.0 g of C4H10O is burned with oxygen?
Is the energy absorbed or released?
(5)
1
2.
Supply the most appropriate word, phrase or numerical value for each of the following
statements.
(30)
a. simplest formula for C6H12NO2
a.______________________
b. chemical term for degree of disorder
b. ______________________
c. full electron configuration for selenium
c. (write on line below)
_______________________________________________________________________
d. 35oC in kelvins
d. ______________________
e. term for energy to remove an electron from neutral atom e. _____________________
f. number of electrons in a 3p orbital
f. ______________________
g. shape of a 3p orbital
g. ______________________
h. term meaning energy releasing
h. ______________________
i. molar mass of iron (II) sulfate
i. ______________________
j. two interconvertible forms of energy
j. ______________________
______________________
k. thermodynamic measure of particle motion
k. ______________________
l. number of electrons possible on 4th atomic shell
l. ______________________
m. element with extremely high electron affinity
m. ____________________
n. simple atom diagram for germanium
n.
_____________________
2
3.
4.
For each of the following properties, rank the substances next to it in order from largest
to smallest value and explain the reason for the ranking.
(12)
First Ionization Energy:
Cu
Ca
As
____________________________
Atomic radius
O
N
F
____________________________
Ionic radius
Sr2+
Se2-
S2- _____________________________
You know that a particular reaction is exothermic. On the axes below, sketch a graph of
the energy versus the reaction progress for this exothermic reaction. Indicate how you
would calculate the activation energy and ∆H for the reaction.
(8)
E
Reaction Progress
3
5.
A compound is analyzed and found to contain 3.16g of carbon, 0.438 g of hydrogen,
and 1.40 g of oxygen. The molar mass of the compound is between 228 and 231 g/mol.
Determine the simplest and molecular formulas for the compound.
(10)
6.
Draw the Lewis dot structures for the following substances. Label any double or triple
bonds.
(12)
CHF3
7.
NaCN
SeS2
AsCl5
Neon has a distinctive color and atomic emission spectrum when energized. Based on
atomic structure, explain why the spectrum is always the same and unique.
(8)
4