# metals

## Hardness of Solid Substances - Grinding Magnesium

Magnesium metal is not easily ground or crushed.

## 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 Tin

Tin is a relatively soft metal that can be flattened.

## Hardness of Solid Substances - Grinding Lead

Lead is a relatively soft metal that can be flattened.

## Ferrimagnetism - Part 1 of 2 - Hematite and Magnetite

Hematite and magnetite are formed from iron(II) and iron(III) solutions.

## Ferrimagnetism - Part 2 of 2 - Testing for Magnetism

Hematite and magnetite samples are tested for magnetism.

## Simulation of Dislocations in Metals - Introduction

Soap bubbles in a raft form grains of close-packed arrays with various orientations relative to each other.

## Relative Reactivity of Alkali Metals

The reactivities of lithium, sodium, and potassium with water are compared.

## Curie Point of Nickel

The magnetic properties of nickel change when it is heated above its Curie point.