Name ____________________
CHEM 1004
Homework #4
Spring 2011
Buckley
This homework is due on Tuesday, February 1, at class time. The assignment will be accepted
up until the start of class on Wednesday, February 2, with a 20% penalty. Assignments turned in
after class that day will receive no credit, though I will look through them if you want me to.
1. (2 points)
a. What law is illustrated by the following set of compounds?
N2O
NO
NO2
N2O4
N2O5
b. Who is responsible for formulating this law?
2. (2 points) Hydrogen is being looked at as a potential energy source for the future. Water
consists of 2.0 parts by mass of hydrogen and 16.0 parts by mass of oxygen. How many
pounds of water would have to be decomposed to obtain one ton (2000 lb.) of hydrogen?
3. (4 points) A substance is thought to be a pure compound. Three samples are analyzed
for nitrogen and oxygen with the results given in the table. Could the material be a
compound? Explain your reasoning.
Sample #
1
2
3
Mass of sample
1.000 g
14.30 g
3.71 g
Mass of nitrogen
0.237 g
3.39 g
0.879 g
Mass of oxygen
0.763
10.91 g
2.83 g
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4. (4 points) An alternative health practitioner claims that a nuclear power plant releases
radiation at a level so low that it cannot be measured but that is harmful to the thyroid
gland. He sells a thyroid extract that he claims can fix the problem.
Use one or more of the FLaReS principles to evaluate this claim and its potential for
being true.