Bonding Flashcards
Why do Ionically bonded substances have high bp and mp
High attraction between the pos and neg ions
When/do ionic compounds conduct electricity
Yes when molten/dissolved but not when solid
Can simple molecules conduct electricity
No never
Do simple molecules substances have high/low bp or mp
Low as they have weak VDW forces so it doesn’t take much to overcome them
Do macromolecular substances have high/low mp and bp?
High as they have many covalent bonds to overcome
Do macromolecular substance conduct electricity
No apart from graphite
How many bonds does diamond have within its atoms
4 other carbon bonds
How many bonds does graphite have within its atoms
3 other bonds with 1 delocalised electrons
Whats metallic bonding
Lattice of pos ions with a sea of delocalised electrons
Do metallic compounds have high/low bp and mp
High as strong forces between pos and neg electrons/ions
Do metallic compounds conduct electricity
Yes
Def electronegativity
The affinity to attract a pair of electrons in a covalent bond
What affects electronegativity
Nuclear charge
Atomic Radius
Electron Shielding
How does VDW arise
Temporary dipoles
Random movement of electrons
Induces temporary dipoles in adjacent molecules
How do dipole dipole attractions form
Polar molecules force attraction between neighbouring molecules
