chemistry v3 Flashcards
non-bonding electrons
lone pairs
VSEPR
valence shell electron pair repulsion
intra-molecular bonds
found inside the molecules (are covalent bonds)
inter-molecular bonds
between molecules
polar covalent bond
-between different elements
-unequal electron sharing
polar covalent molecules
-polar bonds
-asymmetrical
non polar covalent molecules
-between identical elements
-no polar bonds
3 types of intermolecular bonding
- dispersion forces or vander wants forces (very weak bonds)
- dipole dipole bonding
- hydrogen bonding- strongest and is between the N,O,F elements and hydrogen
what do all molecules experience?
dispersion forces
properties of covalent lattices
-very hard
-do not conduct electricity
-shatter when hit in a specific way
-chemically inert (do not react with anything)
what is a covalent bond?
sharing of electrons between two non-metals
what is covalency?
the number of covalent bonds an element can make
catenation
property of carbon ācā to from bonds with itself
properties of graphite
-good conductor of electricity
- high melting point
-has a metallic sheen because of delocalised electrons
delocalised electrons
electrons that can move
why is silver not used for electrical wiring even though it is the best conductor of electricity.
-too expensive
-copper is second best and can be used instead
properties of metals
-high melting and boiling point
-lustrous
-malleability
-ductility
-heat conductivity
-electrical conductivity
all metals have-
high melting and boiling points
more atoms =
more dispersion forces
Names of covalent compounds
- the one with less electronegativity is written before the one with more electronegativity
- first element is written as it is and the 2nd element is written as an -ide
short form names (numbers)
- mono
- di
- tri
- tetra
- penta
- hexa
- hepta
- octa
- nana
- deca
metals are arranged
from most reactive to the least reactive
ionic bonding
formed between metals & non metals, metals give electrons & non metals accept electrons.
properties of ionic compounds
-they form a crystalline lattice
-they have high melting point
-conduct electricity in the aqueous state
