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Metal. Which of the following metals are firstly used by human? gold silver copper bronze iron. Only (i) and (ii). Only (i) 、 (ii) and (iii). Only (i) 、 (ii) 、 (iii) and (iv). (i) 、 (ii) 、 (iii) 、 (iv) and (v). 2. Which of the following s are properties of gold?

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slide2
Which of the following metals are firstly used by human?

gold

silver

copper

bronze

iron

Only (i) and (ii)

Only (i)、(ii) and (iii)

Only (i)、(ii) 、 (iii) and (iv)

(i)、(ii) 、 (iii) 、(iv) and (v)

slide3
2. Which of the followings are properties of gold?

It rarely combine with

other substances .

(ii) It has a very unique colour

(iii) It is relatively hard

(iv) It is relatively soft

Only (i) and (ii)

Only (i), (ii),(iii)

Only (i), (ii)and (iv)

(i), (ii), (iii), (iv)

slide4
3. Gold are mainly used to make

daily utensils.

decorative items.

coins.

electric wire.

slide5
4. Throughout history, silver is always be used to

make

daily utensils.

electric wire.

coins.

musical instruments.

slide6
5. Why copper is widely used in daily life?

It is because copper is cheap.

It is because copper is available in great quantity.

It is because copper is a good conductor of electricity.

It is because copper is a good conductor of heat.

slide7
6.Many daily utensils are made of bronze instead of copper. It is because

bronze is cheaper than copper.

bronze is harder than copper.

the colour of bronze is more beautiful.

using copper to produce daily utensils is more expensive than bronze.

slide8
7. The history of using metals is closely related to :

(I) only

(II) only

(I) & (II) only

(I) & (III) only

The properties of the metal

The abundance of the metal on earth

The level of difficulty in extracting the metal

slide9
8. Most metals have combined with ______ and exist in the form of metal ores on earth.

(I) only

(I) & (II) only

(I), (II)& (III) only

(I) , (II), (III) & (IV)

carbon

oxygen

sulphur

hydrogen

slide10
9. Metals ores mainly consists of ______ of metals

(I) and (II) only

(I) & (II) & (III) only

(I), (II), (III) & (IV) only

(I) , (II), (III) , (IV)& (V)

oxides

sulphides

halides

carbonates

sulphates

slide11
10. From the view of chemistry, the principle of extracting metal from ore is

by using the method of carbon reduction and extract the metal from the ore.

to melt the metal ore.

to decompose the metal ore

to separate the metal from other substances in the metal ore

slide12
11. Aluminium can be used to make aeroplanes, space shuttles and the outer layer of trains, because

aluminium is a good conductor of electricity.

aluminium is available in great quantity.

aluminium is cheap.

aluminium has low density, but it is very hard.

slide13
12. Which of the following is NOT the properties of

copper ?

Good conductor of electricity.

High ductility and malleability .

Corroded by air easily .

Good conductor of heat.

slide14
13. Which of the following property of gold and silver make them can act as good reflectors?

Great mechanical strength.

They combine with oxygen in air and form a layer of oxide on the surface.

Shininess.

High electrical conductivity.

slide15
14. Which of the following correctly states the application of lead and magnesium?

Lead – to insulate against radiation

Magnesium – making fireworks

Lead – tinted on the surface of the satellite

Magnesium – to insulate against radiation.

Lead – tinted on the back surface of glass

Magnesium – making fireworks

Lead – to insulate against radiation

Magnesium – tinted on the surface of the satellite.

slide17
16. Bronze is a metal alloy made from

copper and iron.

copper and aluminium.

copper and tin.

copper and zinc.

slide18
17. Brass is a metal alloy made from

copper and iron.

copper and aluminium.

copper and tin.

copper and zinc.

slide19
18. Solder is a metal alloy made from

lead and tin.

lead and copper.

iron and tin.

iron and copper.

slide20
19. Carbon steel is a metal alloy made from carbon

and _________.

copper

iron

zinc

steel

slide22
22. Stainless steel is a metal alloy made from

iron and tin.

iron and chromium.

iron and zinc.

iron and steel.

slide24
23. Shape-memory alloy can memorize shapes. It is because

shape-memory alloy has only one phase in their solid state.

shape-memory alloy has two different phases in their solid state.

shape-memory alloy has three different phases in their solid state.

particles of shape-memory alloy have different arrangement in solid and liquid state.

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