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AA IGCSE Chemistry > Metals and Alloys > Flashcards

Metals and Alloys Flashcards

1
Q

What is metallic bonding?

A

Bonding formed by the electrostatic attraction between positive metal ions and the sea of delocalised electrons.

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2
Q

Why are metals good conductors?

A

Delocalised electrons flow and carry a charge and potential to conduct.

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3
Q

Why are metals malleable and ductile?

A

They’re arranged in layers which slide over each other.

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4
Q

What are alloys?

A

A mixture of a metal with another element.

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5
Q

Brass is an alloy. What is it made of?

A

copper and zinc

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6
Q

Steel is an alloy. What is it made of?

A

Iron, chromium, nickel, carbon…

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7
Q

Why are alloys stronger and harder than metals?

A

Different sized atoms disrupt regular structure, making it difficult for the layers to slide over each other.

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8
Q

What is a redox reaction?

A

A reaction which includes both oxidation and reduction.

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9
Q

What is oxidation?

A

Gain in oxygen, loss of electrons, increased oxidation number

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10
Q

What is reduction?

A

Loss in oxygen, gain of electrons, decreased oxidation number

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11
Q

What is the oxidation state of a pure element?

A

0, neutral

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12
Q

What is the sum of the oxidation number in a compound?

A

0, neutral

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13
Q

What is an oxidising agent?

A

A substance reduced in the process of oxidising another.

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14
Q

What is a reducing agent?

A

A substance oxidised in the process of reducing another.

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15
Q

What is necessary for rusting?

A

Water and oxygen

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16
Q

What are some common barrier methods?

A

Greasing, painting, covering in plastic material

17
Q

What is galvanising?

A

The use of zinc to protect steel/iron/a less reactive metal from rusting by its own slow sacrifice.

18
Q

How does sacrificial protection work?

A

A more reactive metal reacts with water instead of the metal it is protecting.

19
Q

How are more reactive metals extracted from their ores?

A

electrolysis

20
Q

How are moderately reactive metals extracted from their ores?

A

reduction via use of coke

21
Q

How is aluminium extracted from its ore?

A

electrolysis

22
Q

What is the aluminium ore?

A

bauxite

AA IGCSE Chemistry (18 decks)

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