Topic 2.1.2 - Ionic bonding Flashcards
How is the way ions are arranged in a lattice important?
They are arranged in a way so that the electrostatic fores of attraction between oppositely charged ions are greater than the electrostatic repulsion between ions of the same charge.
How do you calculate the strength of an ionic bond?
Calculating the amount of energy required in one mole of solid to separate the ions where the ions are at an infinite distance from each other.
What is the affect of smaller ions on melting point?
The smaller the ions the greater the melting point is.
This is because the ions can be closer together in a lattice.
What does an increase in charge do to melting point?
Increases when charge increases on ions.
Why do molten and aqeous compounds conduct?
Electrostatic forces are broken so therefore ions are free to move and carry current.
Why are ionic compounds soluble in water?
Both positive and negative ions attracted to water because of its polarity.
Why do ionic compounds have high melting temperatures?
Many ions in the lattice so large amounts of energy required to overcome all of the electrostatic forces of attraction.
Why are ionic compounds brittle?
When a stress is applied, the layers of ions slide over each other. Then ions of the same charge are side by side and so therefore repel each other.
What happens if an ionic compound is hit with a hammer?
It breaks
Its brittle
