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EC Year 9 Chemistry > Unit 2- Bonding, Structure and properties of matter > Flashcards

Unit 2- Bonding, Structure and properties of matter Flashcards

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1
Q

Bonding between non-metal and metal

A

Ionic

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2
Q

Bonding between non-metals

A

Covalent

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3
Q

Bonding in metals

A

Metallic

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4
Q

Why do ionic bonds have high boiling point

A

Strong electrostatic attraction

between oppositely charged ions

Takes a lot of energy to separate

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5
Q

Define ionic bond

A

Strong electrostatic attraction

between positive metal ions and negative non-metal ions

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6
Q

Structure of ionic substances

A

Giant lattice

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7
Q

Metallic bond

A

Electrostatic attraction

Positive metal ions and sea of delocalised electrons

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8
Q

Why do metals have high boiling points?

A

Strong electrostatic attraction

Positive metal ions and sea of delocalised (free) electrons

Takes a lot of energy to seperate

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9
Q

Covalent bond

A

Shared pair of electrons

Between non-metals

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10
Q

Why do simple covalent bonds have low boiling points?

A

Weak inter molecular forces

Takes little energy to separate molecules

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11
Q

Giant Covalent examples

A

Diamond

Graphite

Silicon Dioxide

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12
Q

Why do giant covalent substances have high boiling points

A

Strong covalent bond

Lots of energy need to break it up

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13
Q

Why do metals conduct electricity?

A

Sea of delocalised electrons

Carry electrical charge

Throughout the metal

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14
Q

Define alloy

A

Mixture of a metal and at least one other element

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15
Q

Why are alloys harder than metals

A

Different Size particles

in distorted arrangement

Hard to slide over each other

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16
Q

Why are pure metal softs

A

In nice neat rows

layers slide off easily

17
Q

Why do metals conduct thermal energy?

A

Delocalised electrons

Carry energy throughout the solid

18
Q

What are diamonds made of?

A

Carbon

19
Q

Why are diamonds hard?

A

Each carbon attached to 4 other

Strong covalent bond

20
Q

Why is graphite soft?

A

Layers of carbon

Can slide over each other

21
Q

Why does graphite conduct electricity?

A

Each carbon has spare electron

delocalised (free) electron can carry electrical charge throughout

22
Q

What is graphene?

A

One layer of graphite

23
Q

Why are nano particles useful?

A

high size to charge ratio

24
Q

Define Nanoparticle

A

1-100nm in size

made up of only a few hundred atoms

25
Q

Uses of nano-particles

A

Sun Cream

Deodorants

Catalysts

EC Year 9 Chemistry (4 decks)

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