Unit 9E/F Lesson TwoUnit 9E/F Lesson TwoWe Need Metals Part 2We Need Metals Part 2

Objectives: to learn the properties of Objectives: to learn the properties of metals, what alloys are, the difference metals, what alloys are, the difference between metals and non-metals, and between metals and non-metals, and the names of non-metallic elements.the names of non-metallic elements.

Targets 1 and 2Targets 1 and 2

Work to DoWork to Do

Read pages 16 and 17.Read pages 16 and 17.Copy table 1 page 17.Copy table 1 page 17.Complete questions 2, 3, and 6.Complete questions 2, 3, and 6.Complete C2E2 as a class.Complete C2E2 as a class.Correct HomeworkCorrect HomeworkHomework:Homework: Homework sheet 2.1Homework sheet 2.1 Keywords:Keywords:

phosphorus, silicon, tarnish, graphite, tough, phosphorus, silicon, tarnish, graphite, tough, manganesemanganese, , ductileductile, , stainless steelstainless steel

Boardworks: Metals vs. Non-metals

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Characteristic Metals Non-Metals

Melting Point Melt at high temperatures. Melt at low temperatures.

Sound Sonorous (they ring when struck)

Do not ring.

Heat Conductivity Conduct heat well. Poor heat conductors.

Electrical Conductivity Good conductors of electricity.

Poor conductors of electricity. (Graphite is an exception.)

Brittleness Metals are flexible (the bend), they are ductile (can be drawn into wires), are malleable (can be hammered into sheets).

When non-metals are solid they break easily.

Surface Texture Metals are shiny. Non-metals are dull.

Magnetism Iron, nickel, and cobalt are magnetic.

Non-metals are not magnetic.

Tensile Strength Most metals are quite strong.

Most non-metals are very weak.

Hardness Metals are usually hard. Non-metals are usually soft.