module 2 bonding and structure Flashcards Preview

as chemistry > module 2 bonding and structure > Flashcards

Flashcards in module 2 bonding and structure Deck (13):
1

compound

a substance formed from2 or more chemically bonded elements in a fixed ration, usually shown by a chemical formula

2

ionic bond

the electrostatic attraction between oppositely charged ions

3

giant ionic lattice

3d structure of oppositely charged ions held together by strong ionic bonds

4

group

vertical column in the periodic table. elements in a group have similar chemical properties and the same n.o of valence electrons.

5

covalent bond

bond formed from a pair of shared electrons

6

a lone pair

an outer shell pair of electrons that are not involved in chemical bonding
a lone pair gives a concentrated region of negative charge around the atom, influencing the chemistry of the molecule in a number of ways.

7

dative covalent/ coordinate bond

a shared pair of electrons that has been provided by one of the bonding atoms only

8

electronegativity

a measure of the attraction of a bonded atom for the pair of electrons in a covalent bond

9

permanent dipole

a small charge difference across a bond that results from a difference in the electronagativities of the bonded atoms.eg. a polar covalent bond has a permanant dipole.

10

polar dipole

has an overall dipole when you take in to account any dipoles across the bonds

11

intermolecular force

weak attractive force between neighbouring molecules

12

permanant dipole-dipole force

weak attractive force between permanent dipoles in neighbouring polar molecules

13

van der Walls' forces

attractive forces between induced dipoles in neighbouring molecules.