Rusting Flashcards

1
Q

What are ships made out of

A

Steel because it’s strong

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2
Q

What does rust do to steel

A

Makes it weak + flaky + dangerous

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3
Q

What is silica gel used for

A

A drying agent that removes moisture

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4
Q

What is steel made from

A

Iron and carbon

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5
Q

Why would a car not rust in the desert

A

The atmosphere is very dry

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6
Q

Word equation of rusting

A

Iron + oxygen + water -> hydrated iron (III) oxide

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7
Q

What happens to steel in salt

A

It speeds up the rusting process and makes it very rusty

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8
Q

Is gold a good alternative to steel

A

It’s too soft and expensive

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9
Q

What is stainless steel

A

Chromium + steel and no it doesn’t rust

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10
Q

What is copper used for

A

Water pipes

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11
Q

What is made of iron

A

Gates/railings
Bridges
Cars etc

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12
Q

What happens to a metal nail when there is water and oxygen present

A

Lots of rust occurs

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13
Q

What happens to a metal nail when oxygen and no water is present

A

No rust occurs

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14
Q

What happens to a metal nail when water and no oxygen is present

A

Very little use as it is very difficult to get rid of all oxygen

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15
Q

What happens to a metal nail when water,oxygen and since are present (galvanised)

A

No rust occurs

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16
Q

Chemical name for rust

A

Hydrated iron(III) oxide

17
Q

What two conditions are required for rusting

A

Water (moisture) + oxygen

18
Q

Four methods to prevent rusting

A

Painting/oiliing
Plastic coating
Galvanising
Sacrificial protection

19
Q

What is does plastic coating do

A

It prevent air and moisture from reaching the iron

20
Q

What is galvanising

A

When iron objects are coated with a more reactive metal such a as zinc or chromium

21
Q

Cheapest method of preventing rust

A

Painting or oiling

22
Q

Uses of rust prevention

A

Gate-painting
Hull of a ship-sacrificial protection
Machinery-oiling
Iron nail-galvanising