Chemistry Final
Review Session 1 - May 5, 2011
Density
•
Density = Mass/Volume
Density Graph
What is the density of salt water?
Precision vs accuracy
•
accuracy = how close a
result is to the ACTUAL
value
•
precision = how close
together a set of results
are to one another
Mixtures, compounds
•
What is the difference
between a mixture and a
compound?
Chemical vs physical
changes
•
Physical change = no
change in composition
•
Chemical change =
change in chemical
composition
SI system
•
Be able to convert
between units
•
milli, centi, deci, deca,
kilo, etc.
•
meters, kilograms, liters,
Ways to separate mixtures
•
Physical means of
separating mixtures
•
Distillation
•
Filtration
•
Chromatography (pass
mixture through a
physical medium smallest molecules travel
farthest, etc.)
How to draw a graph
•
Descriptive Title
•
Scale for maximum coverage
of graph area
•
Set Origins for maximum
expression of data features
•
Axis Labels with Units
•
Points clearly indicated
•
Smooth curve, not dot-to-dot
Nomenclature - IOnic
•
MgCl2
•
NaNO3
•
Fe2O3
•
FeO
•
NaC2H3O2
Writing compounds
•
You have an ionic
compound of Aluminum
and the polyatomic ion
sulfate. What is the
correct formula?
•
What is the correct
formula for Calcium
Oxide?
•
What is the correct
formula for Cu(II)
Hydroxide?
Covalent nomenclature
•
H2O
•
NO
•
SO2
•
CSe2
Moles
•
How many moles of
Oxygen atoms in 3 moles
of water?
•
What is the molar mass
of CO2? C6H12O6?
•
How many atoms in 3
moles of B2O3?
Percent composition
•
What is the percent
composition of Carbon in
CO2?
Empirical formula
•
Butyric acid gets its name from
the Latin "butyrum", meaning
butter, and is the compound in
rancid butter that gives it its
terrible smell. A 2.50 g sample
of butyric acid was found to
consist of 1.36 g carbon, 0.23 g
hydrogen, and 0.91 g oxygen.
Find its empirical formula.
Empirical formula
•
Natural gas is a mixture of
several hydrocarbons, but
is primarily methane. Find
the empirical formula of
this important natural
resource if its composed of
74.8% carbon and 25.2%
hydrogen
Molecular formula
•
The simplest formula for
vitamin C is C3H4O3.
Experimental data
indicates that the
molecular mass of
vitamin C is about 180.
What is the molecular
formula of vitamin C?
BAlancing equations
•
Balance the following equations:
•
____ Na3PO4 + ____ KOH ____ NaOH + ____ K3PO4
•
____ Na3PO4 + ____ CaCl2 ____ NaCl + ____ Ca3(PO4)2
•
____ CH4 + ____ O2 ____ CO2 + ____ H2O
Types of reactions
•
A + B --> AB
•
AB --> A + B
•
AB + C --> CB + A
•
AB + CD --> AD + CB
•
Hydrocarbon + O2 --> CO2 + H2O + heat