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Chemistry nat 5 > Bonding > Flashcards

Flashcards in Bonding Deck (29)
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1

What are the three main types of bonding ?

Covalent, ionic and metallic

2

Why do atoms bond ?

To achieve a full outer electron shell

3

What do molecules contain ?

They contain 2 or more non-metal atoms held together by covalent bonds

4

What do diatomic molecules contain ?

They contain 2 atoms only

e.g. Carbon monoxide
Hydrogen monoxide

5

Name 3 diatomic elements ?

H2, N2, O2, F2, Cl2, Br2, I2

6

What is a covalent bond?

The force of attraction between the nuclei and the shared outer electrons

7

What are the 4 basic shapes of molecules ?

Linear, angular, pyramidal and tetrahedral

8

Name the 2 types of covalent compounds ?

Discrete molecular and giant networks

9

What do all discrete covalent molecules have ?

Low melting and boiling points because only weak intermolecular bonds are broken not covalent bonds

10

What do covalent networks have ?

Very high boiling points because strong covalent bonds must be broken

11

What do ionic compounds contain ?

Oppositely charged ions

12

Describe what is meant by an ionic lattice ?

All ionic compounds are solid at room temperature with the ions being held in a fixed pattern called an ionic lattice

The ions can't move and are held in place by the strong forces of attraction between opposite charges

13

What is an ionic bond ?

The force of attraction between oppositely charged ions in a compound

14

Conductors of electricity ?

All metals (any state)
Carbon (graphite)
Liquid ionic compound

15

Insulators of electricity ?

Non-metals (except carbon)
Covalent substances
Solid ionic compounds

16

How do element conduct electricity ?

By flow of electrons

17

How do compounds conduct electricity ?

By flow of ions

18

Why do ionic liquids conduct electricity ?

because the ions that were held in the lattice structure are now free to move

19

How is the ionic lattice broken down ?

By heating and dissolving

20

What are electrolytes ?

Liquids that conduct using the movement of ions

21

Name the 2 ways to produce an electrolyte ?

Dissolve solid ionic compounds in water

Melt solid ionic compounds

22

What has a high melting point ?

Ionic compounds and giant covalent networks

23

What has a low melting point ?

Covalent molecular

24

Why do giant covalent networks have high melting points ?

because strong covalent bonds must be broken

25

Why does a covalent molecular have a low melting point ?

less energy is required because only weak bonds between the molecules are being broken

26

Why do ionic compounds have high melting points ?

because strong ionic bonds must be broken

27

Are ionic compounds soluble in water ?

Yes

28

Are covalent compounds soluble in water ?

No they are insoluble

29

What is a metallic bond ?

The force of attraction between positively charged ions and delocalised electrons