Question

1. What does a (alpha), the coefficient of linear expansion, tell us about a substance? Can a (alpha) be negative? Explain what this means. Can it be zero? Explain.

2. What material has the grater coefficient of linear expansion, aluminum or brass?

3. In general, what would a negative number for the value of a (alpha) mean? Name a common substance which exibits this behavior and under what conditions. (Hint: it is a liquid)

Answer #1

1) When **the temperature of a
substance increases,** **its intermolecular energy
stored in intermolecular bonds increases resulting in increase in
the length of bonds. As a result of which, solid typically expands
while heating** and contracts while cooling. This
**Dimesional Representation of Linear Expansion( basically
the expansion/contraction in linear dimensions) is representated by
Coefficient of Linear Expansion** given by

2) Aluminium

3) Yes it can be negative but for
limited cases only. There are **some materials which undrrgo
contraction on heating thereby having negative cofficient of linear
expansion**. For eg: **Cubic Zirconium Tungstate
(ZrW _{2}O_{8}).**

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What does it tell us about the value of the population correlation
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