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science > chemicals in industry ( form 4 chap 9 ) > Flashcards

chemicals in industry ( form 4 chap 9 ) Flashcards

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1
Q

what are alloys?

A

alloys are mixtures that consist of metal elements and non-metal elements

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2
Q

what is the process of mixing a pure metal with other metals or elements called?

A

alloying

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3
Q

purpose of alloying?

A

increases hardness of the metal
prevent corrosion
improve the finishing of the metal

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4
Q

what is a superconductor alloy?

A

a substance that conducts electricity with no resistance

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5
Q

what alloy is made of 75% copper and 25% zinc?

A

brass

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6
Q

what is steel made of?

A

99% iron 1% carbon

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7
Q

what alloy is made of 88% copper and 12% iron?

A

bronze

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8
Q

what alloy is made of 96% tin, 3% copper and 1% antimony?

A

pewter

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9
Q

what is brass used for?

A

to make locks and keys, musical instruments and zippers

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10
Q

what alloy is used to make coins, medals and statues?

A

bronze

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11
Q

what alloy is used to make building frames, railway tracks and bridges?

A

steel

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12
Q

what is the use of pewter?

A

to make decorative items

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13
Q

what is glass?

A

glass is a non- crystalline solid that is often transparent

its main component is silica or silicon dioxide which is made from sand

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14
Q

what are the properties of glass?

A 
its translucent
hard but fragile
heat insulator
chemically inert
corrosive
poor electrical conductor
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15
Q

what glass is used to make laboratory apparatus? why?

A

borosilicate glass because of its high resistance to heat and chemicals

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16
Q

what glass is used to make light bulbs and why?

A

soda-lime glass because of its resistance to heat and it is easily shaped

17
Q

what glass is used to make a glass prism used to study the dispersion of light? why?

A

lead crystal glass because it has a high refractive index

18
Q

what are ceramics?

A

materials made from clay that have been heated to high temp

19
Q

what is the main component of clay?

A

aluminium silicate

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