# solid state chemistry

## Hardness of Solid Substances - Cutting Lithium

Lithium, a very soft metal, can be cut with a knife.

## Hardness of Solid Substances - Grinding Graphite

Graphite can easily be crushed into small pieces.

## Hardness of Solid Substances - Grinding Magnesium

Magnesium metal is not easily ground or crushed.

## Hardness of Solid Substances - Grinding Sulfur

Sulfur can easily be ground to a fine powder.

## Hardness of Solid Substances - Grinding Iron

Iron metal is not easily ground or crushed.

## Hardness of Solid Substances - Grinding Zinc

Zinc metal is not easily ground or crushed.

## Hardness of Solid Substances - Grinding Selenium

Selenium can easily be ground to a powder.

## Hardness of Solid Substances - Grinding Tin

Tin is a relatively soft metal that can be flattened.

## Hardness of Solid Substances - Grinding Iodine

Iodine can be ground to coarse grains.

## Piezoelectric Effect: Part 1 of 2

A piezoelectric crystal is pressed and released producing an electric current that lights an attached bulb.