Chapter 18, Problem 3A

To determine

The evidence for the microscopic crystal nature of some solids.

Explanation of Solution

Introduction:

The particles of crystal are arranged in an ordered repeated pattern. Crystals are regularly geometric shapes.

When metals etch with acids, crystals in the metals are seen. The surface of galvanized ironexposed to weather and brass doorknobs etched by an impression of hands are the evidence of the crystal nature of some solids.

Conclusion:

Iron exposed to the weather and brass doorknobs is the evidence of the crystal nature of some solids.