Chemical bonds
what is another name for an electron dot diagram?
a Lewis dot diagram
how are covalent bonds formed?
when 2 atoms share electrons
mono-
di-
what is a diatomic molecule?
molecules that are found naturally in pairs
what is a chemical bond??
the force of attraction that holds atoms together as a result of the rearrangement of electrons between them.
why do covalent bonds usually form between 2 nonmetals?
nonmetals can bond to other nonmetals by sharing electrons
hepta-
octa-
7,8
what is the chemical formula for Carbon Dioxide?
CO2
what does a Lewis dot diagram contain?
- the symbol for the element
- surrounded by dots which each represent one valence electron.
covalent bonds have a _____ melting point and _____ electrically conductive.
low, are not
tri-
tetra-
3,4
what is the chemical formula for formaldehyde?
CH2O
what does a chemical bond result from??
the attraction of nuclei for electrons
what is the difference between polar and nonpolar bonds?
polar- electrons shared unequally
non-polar- electrons shared equally
nona-
deca-
9,10
name 3 properties of Carbon Dioxide...
- it is a molecule
- non-polar
- both ends are slightly negative
what are valence electrons?
- those electrons that have the highest energy, involved in chemical bonds.
- the # of valence electrons in each element help determine the chemical properties of that element
name 6 properties of covalent bonds...
- poor conductors of heat and electricity
- lower melting and boiling points
- solid, liquid, or gas
- strong bonds between atoms, weak attraction between molecules
- soft
- do not dissolve in water
penta-
hexa-
5,6
name 3 properties of formaldehyde...
- it is a molecule
- one end in positive, other is negative
- polar