Sept. 16, 2004
Chem104a
1
1.
(20 pts.)
1a.
(3 pts.) You are an alien on another planet in another galaxy, and you are a scientist.
The laws of Gay-Lussac and Avogadro are known.
You find that when volumes are
combined for some alien gaseous elements, you get the following results.
A and B are
two alien elements that combine to form a compound.
(A
x
B
B
y
) is a new compound whose
composition is unknown.
The volumes used in the reaction are given below the equation.
For the gases
2A
s
+
B
t
Î
3(A
x
B
B
y
)
2 vol
1 vol
3 vol
What are the correct formulas for A, B and (AB) based on this information.
A:
______________
B:
________________
AB:
________________
A
2
B
A
3
B
B
3
1b.
(5 pts.) Absolute zero on the Celsius scale is –273.15
°
C. This defines the Kelvin
scale.
In the English system the absolute zero scale is the Rankin scale.
What is absolute
zero in Fahrenheit units for the Rankin scale?
F
=
9
5
C
+
32
F
=
9
5
−
273.15
(
)
+
32
F
= −
459.67
Answer:
________________
1c. (6 pts.) Give the names for the following compounds:
(NH
4
)
2
Cr
2
O
7
__Ammonium dichromate__
Ca(ClO
4
)
2
____Calcium perchlorate____________
H
2
S
___hydrogen sulfide______________
1d. (6 pts.)
Write the correct formula for the following compounds or ions:
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Sept. 16, 2004
Chem104a
2
hydrogen sulfate ion
__________________________
HSO
4
-
Chromate ion
______________________
CrO
4
2-
Calcium phosphate
__________________
Ca
3
(PO
4
)
2
II. (6 pts.) ( Zumdahl, p 76 #34) a.

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- Spring '07
- Bau
- Chemistry, Atom, Electron, Mole, Absolute Zero, pts, mol
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