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Metals Revision. What you need to know: What is a metal? What are the physical properties of metals? Why are metals useful?. To Do: Make a list of as many metals as possible . . To Do: Complete the Properties of Metals worksheet . .

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Presentation Transcript
slide1

Metals Revision

  • What you need to know:
    • What is a metal?
    • What are the physical properties of metals?
    • Why are metals useful?
  • To Do:
    • Make a list of as many metals as possible

slide2

To Do:

    • Complete the Properties of Metals worksheet

slide3

All metals are shiny when polished or freshly cut

Lustrous

Flexible

Metals do not break – they bend

Ductile

Metals can be drawn into wires

Malleable

Metals can be hammered into sheets

Sonorous

Metals ring like a bell when hit - they do not make a dull thud

Electrical conductor

All metals conduct electricity

Metals allow energy to flow through them, causing heating

Thermal conductor

slide4

Which of the following are NOT properties of most metals?

strong magnetic high melting point

brittle hard

slide6

Which is the odd one out?

B

C

A

Iron

Cobalt

Copper

D

Copper is non-magnetic – iron, cobalt and nickel are magnetic

Nickel

slide7

Which is the odd one out?

B

A

C

Antimony

Palladium

Arsenic

D

Palladium is the only metal – the others are non-metals

Graphite

slide8

Which is the odd one out?

A

C

B

Titanium

Iridium

Aluminium

Mercury is liquid at room temperature – the others are solids at room temperature

D

Mercury

slide9

Which is the odd one out?

B

A

C

Aluminium

Bronze

Electrum

Aluminium is an element – the others are mixtures of two or more elements

D

Brass

slide10

Which is the odd one out?

A

B

C

Sodium

Potassium

Calcium

D

Calcium is in Group 2 – the others are in Group 1 of the Periodic Table

Lithium

slide11

Which is the odd one out?

B

C

A

Silver

Tin

Copper

D

Tin is only found as a compound – the others often occur naturally as elements

Gold

slide12

Which is the odd one out?

A

B

C

Good Thermal Conductor

Sonorous

Malleable

Only cobalt, nickel and iron are magnetic – the others are properties of most metallic elements

D

Magnetic

slide13

Which is the odd one out?

C

B

A

Selenium

Calcium

Palladium

D

Selenium is a non-metal – the others are metals

Zinc

slide14

Which is the odd one out?

B

C

A

Iron

Thallium

Zinc

D

Thallium is extremely toxic – you need small quantities of the others in your diet to remain healthy

Magnesium

slide15

Which is the odd one out?

B

C

A

Molybdenum

Copper

Yttrium

D

Copper has been known since ancient times – the others were discovered in the 18th Century

Tungsten

slide18

1. Saucepans are made of copper, iron, steel or aluminium

Metals are good thermal conductors

Most metals have high melting points

slide19

2. Electrical wires are made of copper

Metals are good electrical conductors

Most metals are ductile...

... they can be drawn out into wires

Most metals are flexible

slide21

4. A lot of jewellery is made of gold

Metals are lustrous...

... shiny when polished or freshly cut

Most metals are ductile

Most metals are malleable...

... they can be beaten flat into sheets

slide22

5. Bells are made of bronze (an alloy of copper and tin) or brass (an alloy of copper and zinc)

Most metals are sonorous...

... they ring when hit, rather than make a dull thud

slide23

6. The framework of skyscrapers is made of iron or steel girders

Most metals are strong

Because metals are flexible, buildings with a metal frame have some ‘give’ in them...

... meaning that they survive better during earthquakes

Iron and steel are much lighter than brick or stone so metal-framed buildings can be taller than masonry buildings

slide24

7. The filament in light bulbs is made of tungsten

Metals are good electrical conductors

Most metals have a high melting point

(The filament glows because it gets very hot – 2000 to 3000 ˚C)

slide25

8. Saw blades are made of steel

Most metals are hard

The harder the blade is, the less quickly it goes blunt

slide26

9. Flashing – the joins on roofs are waterproofed with sheets of lead

Most metals are malleable...

... so the lead flashing can be moulded to the contours of the roof

slide27

10. The casing on compasses is made of brass or aluminium

Most metals are NOT magnetic

Only iron, nickel and cobalt (and their alloys) are magnetic

If we made the casing of a compass from a magnetic metal it would shield the compass needle from the Earth’s magnetic field...

... so the compass would not work!

slide28

Copy and complete the notes below, filling in the blanks

  • There 92 naturally occurring elements in the _______ Table:
  • the majority of these elements are ______
  • The metals are found on the _____ and the centre of the Periodic Table
  • Metals share many _________ and chemical properties
  • _______ is the only metal which is liquid at room temperature
  • Iron, nickel and ______ are the only elements which are ________

Periodic

metals

left

physical

Mercury

cobalt

magnetic

slide29

What you need to know:

    • What is a metal?
    • What are the physical properties of metals?
    • Why are metals useful?