5.3 Ionic Bonding And Structure Flashcards Preview

OCR Chapter 5 Chemistry (AS) > 5.3 Ionic Bonding And Structure > Flashcards

Flashcards in 5.3 Ionic Bonding And Structure Deck (17)
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1

Define ionic bond

The electrostatic attraction that holds cations (+) and anions (-) together in ionic compounds.

2

Common cations

Metal ions - Na+, Ca2+, Al3+

Ammonium ions - NH4 +

3

Common anions

Non metal ions - Cl-, O2-

Polyatomic ions - NO3 -, SO4 2-

4

What do dot and cross diagrams show?

The electron transfer of outer electrons

5

What do the square brackets in dot and cross diagrams represent?

The charge and that the ions are seperate entities

6

Why are the inner shells not shown in dot and cross diagrams?

Because they're full so they're not involved

7

What do ionic compounds form?

Giant ionic lattices because each ion attracts oppositely charged ions in all directions.

8

Low or high melting and boiling points?

A large quantity of energy is needed to overcome the strong electrostatic attraction between ions, so they are both high

9

State at room temperature?

Solid due to high boiling point

10

What increases the compounds melting points?

Lattices containing ions with greater charges increase Melting point

11

Are ionic compounds soluble?

They are soluble in polar solvents, such as water.

12

Why may a compound not be able to dissolve?

Attraction increase with charge so ions with large charges may contain attractions that are too strong to be broken by polar molecules

13

Two processes involved in solubility?

The ionic lattice must be broken down

The solvent must then attract and surround the ions

14

When can a ionic compound conduct electricity?

Why?

When it is molten because the lattice has broken don so ions are now free to move as mobile charger carriers

15

When can't ionic compounds conduct electricity?

Why?

When solid because ions are in fixed positions meaning that there are no mobile charger carriers

16

Are ionic lattices brittle?

Yes when hit they lose formation and ions repel one another

17

Where are electrons transferee to and from ?

From metal to non metal outer shells