Bonds Flashcards
What is ionic bonding
Oppositely charged ions are held together by strong electrostatic forces of attraction
What is a lattice
Ions are held together in a structure in regular, repeating arrangement
Explain the boiling and melting points of Ionic compounds
The strong forces of electrostatic attraction require a lot of energy to break them, so therefore the boiling and melting points of a ionic compound are high
What is a covalent bond
A covalent bond is a shared pair of electrons which are usually formed by 2 non metal atoms
What is a molecule
A molecule is a group of atoms held together by covalent bonds.
What 2 things are needed for something to conduct electricity
For something to conduct electricity, it must have charged particles which must also be free to move.
Can ionic compounds conduct electricity when in a solid state
No because the charged particles are not free to move
What does molten mean?
Molten means a substance that is melted
What does valency mean?
The number of covalent bonds an atom can form
Describe the electrostatic forces of attraction in covalent bonds
The atoms in molecules are held together by strong electrostatic forces of attraction between the positive nuclei and negative electrons in the bonded atom.
What are monomers
Small, simple molecules that con be joined to make a polymer.
Describe the intermolecular forces between polymers
There are more intermolecular forces between larger polymers. The longer chains also tend to get tangled up with each other. More energy is needed to overcome the forces to melt or boil the substance, so polymers have higher melting and boiling points.
Describe the structure of a metal
Metals consist of a giant lattice of positive ions packed closely together, surrounded by a sea of electrons.
What is a metallic bond
Metallic bonding are the strong forces of electrostatic attraction between the charged metal ions and the negatively charged electrons
State some properties of metals
Malleable High melting/ boiling point High density Shiny when polished Good conductors of electricity
