EL7:2 Blood, Sweat And Seas Flashcards
What are ionic compounds at room temperature and pressure?
Solids.
What does the regular arrangement of ions in an ionic lattice form?
Regularly shaped crystals.
What do the electrostatic attractions of oppositely charged ions overcome?
Any repulsion between ions of the same charge, holding together the lattice structure.
What are electrostatic attractions like?
Strong.
What do metals also have?
A lattice structure.
What is the electron sea model?
A model where the metal is pictured as a giant lattice of metal cations in a sea of delocalised electrons.
Why do metals have a flow of electricity?
They have delocalised electrons that are free to move.
Why do metals have high melting and boiling points?
They have strong electrostatic attractions between the metal cations.
What do covalent networks have between their atoms?
Strong covalent bonds.
Why do covalently bonded networks have high melting and boiling points?
It takes a lot of energy to break their intramolecular electrostatic attractions.
What are covalent networks also?
Insoluble in water.
What can’t covalent networks do?
Conduct electricity.
What is the only covalent network that can conduct electricity and why?
Graphite, because of its structure.
