chem test

Question 1

four major categories

Answer 1

ionic
covalent
metallic
network solids

Question 2

all compounds will conduct electricity if..

Answer 2

ions or electrons are present

Question 3

all compounds with strong bonds will have..

Answer 3

high boiling point and high melting point

Question 4

ionic bonds

Answer 4

create ionic compounds

form due to the electrical attraction between positive and negative ions
metal and nonmetal or polyatomic ions
high mp and high bp
very strong bond
solid does not conduct electricity
liquid conducts electricity
all ionics transfer electrons

Question 5

covalent bonds

Answer 5

create molecules

formed when two atoms share one or more pairs of electrons
two nonmetals
weaker bond then ionic

bond polarity - difference in electro negativity
if difference is 0, the bond is non polar

molecular polarity- based on bond polarity and molecule shape (stable)

Question 6

network bonds

Answer 6

hardest strongest category of substance (diamond, graphite, sand)
very strong bond
highest mp

Question 7

metallic bonds

Answer 7

metals
surrounded by mobile electrons
conducts electricity solid and liquid
malleable (change shape by hammering down)
luster (shiny)
ductile
high mp and bp
positive metal ions in sea of mobile electrons conducts electricity

Question 8

difference between intramolecular and intermolecular bonds

Answer 8

intramolecular - between atoms within a molecule
intermolecular - between molecules

Question 9

intermolecular bonds

dipole dipole

Answer 9

dipole dipole
-occur between polar covalent and assymetrical molecules
-lower mp and bp than molecules with hydrogen bonds
-poor to moderate conduction of electricity

Question 10

intermolecular bonds

hydrogen bonds

Answer 10

occurs when hydrogen is bonded to very electronegative atoms (N, O, F)
moderately strong bond
highest mp and bp of covalent compounds

Question 11

intermolecular bonds

van der waals forces (“weak” forces)

Answer 11

only attraction between nonpolar molecules and noble gases
Weakest, attractive force
Substances have lowest MP and BP
Strongest, when more electrons and molecule or when closer together
Molecules do not conduct electricity
Very weak bond