Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
30 Chemistry: Matter and Change
Solving Problems: A Chemistry Handbook
SOLVING PROBLEMS:
A CHEMISTRY HANDBOOK
CHAPTER
3
e. A pan of water boils on a stove until the pan becomes dry.
f. Soap and water are used to clean up a spill of grease.
g. Mothballs vaporize in a closed closet.
20. Aluminum can combine chemically with various substances,
but it never reacts to form simpler substances. Is aluminum an
element, a compound, or a mixture? How do you know? Is aluminum a substance? Explain.
21. The mineral cassiterite is mined as a commercial source of tin.
It is a compound of the elements tin and oxygen. A 1.000-kg
sample of pure cassiterite mined in Germany contains 788 g
of tin. Is it possible to predict the mass of tin contained in a
43.5-kg sample of cassiterite mined in South America? Explain
your reasoning.
22. The elements carbon and sulfur are solids at room temperature.
Can you reasonably predict that a compound of these two elements will also be a solid at room temperature? Explain your
conclusion.