Ionic Compounds

Question 1

What structure do ionic compounds always have?

Answer 1

Giant Ionic Lattice

Question 2

Define Giant Ionic Lattice

Answer 2

Regular structures, held together by ionic bonds (strong electrostatic forces of attraction between oppositely charged ions) acting in all directions
Energy is required to break these ionic bonds when the substance melts or boils.

Question 3

Why do ionic compounds have high melting and boiling points?

Answer 3

Because of the strong attraction between ions requiring a large amount of energy to overcome

Question 4

Describe the conductivity of electricity in ionic compounds

Answer 4

Ionic compounds don’t conduct electricity because the ions are fixed in place and can’t move
However, when an ionic compound melts, they are free to move and can then carry an electric charge

Question 5

Do ionic compounds dissolve in water?

Answer 5

Many ionic compounds dissolve easily in water

Question 6

Name 3 properties of ionic compounds

Answer 6

High melting and boiling points
Solid ionic compounds don’t conduct electricity
Many dissolve easily in water

Question 7

Give advantages and disadvantages of 2D representations of substances

Answer 7

Simple
Great at showing which atoms something contains and how the atoms are connected

Don’t show shape of substance
Don’t give you an idea about the sizes of the atoms

Question 8

Give advantages and disadvantages of dot and cross diagrams of substances

Answer 8

Show how compounds are formed and where electrons in bonds came from

Don’t demonstrate size of atoms or ions or how they are arranged

Question 9

Give advantages and disadvantages of 3D models of ionic solids

Answer 9

Show arrangement of ions

Only show outer layer of the substance

Question 10

Give an example of 3D models to show substances

Answer 10

Ball and stick models