BASIC SCIENCE�CHEMISTRY�Student Book-Class 8

Reshma VS

Physical Science 21-23

�UNIT-7 METALS�

• Thermal Conductivity 4
• Electrical Conductivity 5

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COURSE STRUCTURE

CONTENTS

Properties of metals

3

1.Properties of Metals

4

• Metals are good thermal conductors.
• Most metals have high melting points.

The ability to conduct heat is an important property of metals. This property is known as thermal conductivity. Silver is the best thermal conductor among metals, Aluminium, Copper, etc., also possess comparatively high thermal conductivity.

1.1Thermal Conductors

Metallic vessels are commonly used for cooking. Which metals are commonly used to make utensils? And why?

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5

• All metals are conductors of electricity.

The ability of a substance to let electricity pass through it is known as electrical conductivity. Silver is the best electrical conductor among metals. Copper and aluminum are also good conductors of electricity. Still, the electrical wires in our houses are made of copper.

1.2 Electrical Conductors

The electric wires that we see on the electric posts are made up of Aluminum? What could be the reason?

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2. Uses of Metals

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What do you need to know?

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• What is a metal?

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• What are the physical properties of metals?

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• Why are metals useful?

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