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Chemistry > Transition Metals > Flashcards

Transition Metals Flashcards

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1
Q

where are transitional metals found on the periodic table

A

between groups 2 and 3

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2
Q

what are 4 typical properties of transition metals

A

high melting point
high density
form colour compounds
catalytic activities

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3
Q

what does the oxidation of iron/steel cause

A

rusting

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4
Q

what does rusting require

A

oxygen and water

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5
Q

what are 4 ways to protect metals from rusting by keeping oxygen and water away

A

painting
using oil or grease
coating with plastic
coating with another metal

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6
Q

what method to prevent rusting keeps only oxygen away

A

storing in a vacuum

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7
Q

what method to prevent rusting keeps only water away

A

place in a container with a desiccant

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8
Q

what is a desiccant

A

a chemical that absorbs water vapour

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9
Q

what is electroplating

A

covering a metal with a thin layer of an unreactive metal keeping air and water out

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10
Q

what are the 2 purposes of electroplating

A

improves appearance
resistance to corrosion

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11
Q

what is galvanisation

A

a form of sacrificial protection where metal is coated with a more reacting metal so that the zinc will corrode instead of the iron

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12
Q

what is an alloy

A

a mixture of metals with one or more other elements

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13
Q

name the 5 alloys

A

steel
stainless steel
magnalium
jewellery gold
brass

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14
Q

what metals make up steel

A

iron and carbon

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15
Q

why is steel used

A

harder and stronger than iron alone

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16
Q

what metals make up stainless steel

A

carbon
iron
chromium

17
Q

why is stainless steel used

A

resistant to corrosion
strong like steel

18
Q

what are some uses of steal

A

buildings
bridges
cars

19
Q

what metals make up magnalium

A

aluminium
magnesium

20
Q

what are some porperties of magnalium

A

low density

21
Q

what are some uses of magnalium

A

car and aeroplane parts

22
Q

what is jewellery gold made up

A

gold
copper

23
Q

what are some typical properties of jewellery gold

A

attractive
resistant to corrosion

24
Q

what is the use of jewellery gold

A

jewellery

25
Q

what is brass made out of

A

copper and zinc

26
Q

what are some typical properties of brass

A

hard, resistant to corrosion, good conductor

27
Q

what are 2 uses of brass

A

electrical plugs, coins

28
Q

explain why brass is stronger than copper

A

in pure copper layers of atoms can slide over each other easily as all the atoms are the same size, however when zinc atoms are added to make brass. the zinc atoms disrupt the layer making it more difficult for atoms to slide over each other

Chemistry (11 decks)

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