Chem 126 Lab Final Exam Questions AND Correct Answers
A body centered cubic unit cell has how many atoms? - ✔✔2
atoms
A body centered cubic unit cell has what coordination
number? - ✔✔8
A body centered cubic unit cell has what percent occupied
volume? - ✔✔the middle
A face centered cubic unit cell has how many atoms? - ✔✔4
atoms
A face centered cubic unit cell has what coordination number?
- ✔✔12
A face centered cubic unit cell has what percent occupied
volume? - ✔✔the most
A primitive cubic unit cell has how many atoms? - ✔✔1 atom
,A primitive cubic unit cell has what coordination number? -
✔✔6
A primitive cubic unit cell has what percent occupied volume?
- ✔✔the least
A reaction is said to be reversible if the (reversible reactions) -
✔✔products of the reaction can react to form the original
reactants
A solid acid sample of an unknown purity can be analyzed by
titration with a standardized base (titrations of acids and
bases) - ✔✔the sample is weighed and dissolved in water
titration to endpoint with standardized base will make it
possible to calculate composition of unknown acid
A solution of 35.7 g of an organic non electrolyte in 220 g of
chloroform has a boiling point of 64.5˚C. What is the molar
mass of the solute? (normal boiling point of chloroform is
61.26˚C, the boiling point elevation constant for chloroform is
3.63˚C/m) - ✔✔182 g/mole
Abscissa - ✔✔the x value
,Al(OH)4- is (reversible reactions) - ✔✔insoluble, however is
amphoteric
Amorphous Solid - ✔✔has no regular structure
Amphoteric (reversible reactions) - ✔✔dissolves in both acid
and bases
An insoluble salt of a weak acid may frequently be dissolved
by (reversible reactions) - ✔✔the use of a strong acid
An insoluble salt of a weak acid may frequently be dissolved
by the use of a strong acid, write a balanced equation showing
an example of this statement - ✔✔CaCO3(s) <---> Ca2+(aq) +
CO3 2-(aq)
an acid will react with the CO3 2- and produce HCO3- which
will decrease the amount of a product shifting the reaction to
the products side and thus dissolve more of the CaCO3
An unknown metal is oxidized spontaneously with Cd2+ being
reduced to Cd, the Ecell is measure to be .337V, what is the
, Ered of the unknown metal ion to the elemental metal? What
reaction occurs at the cathode? - ✔✔Cd2+ to Cd
Ered= -.403V
thus .337V= -.403V +Eox
Eox= .74V
reduction half reaction, unknown metal cation being reduced
to the unknown metal
As a result of lowering the vapor pressure, more energy must
be supplied to the solution to cause the vapor pressure to
equal atmospheric pressure, what is a result of this?
(colligative properties) - ✔✔the solution will have a higher
boiling point than the pure solvent
As electrons flow through the wire from the copper electrode
toward the silver electrode (electrochemistry) - ✔✔negative
ions (nitrate from salt bridge/silver half cell) will migrate
through the solution and the salt bridge toward the excess
positive charge that is being produced around the copper
electrode as copper(II) ions are formed
positive ions (Ag+, Cu2+, potassium ions from salt bridge) will
migrate toward the silver half cell where an excess of negative
charge is building up as silver ions are removed from the silver
nitrate solution to form silver metal
A body centered cubic unit cell has how many atoms? - ✔✔2
atoms
A body centered cubic unit cell has what coordination
number? - ✔✔8
A body centered cubic unit cell has what percent occupied
volume? - ✔✔the middle
A face centered cubic unit cell has how many atoms? - ✔✔4
atoms
A face centered cubic unit cell has what coordination number?
- ✔✔12
A face centered cubic unit cell has what percent occupied
volume? - ✔✔the most
A primitive cubic unit cell has how many atoms? - ✔✔1 atom
,A primitive cubic unit cell has what coordination number? -
✔✔6
A primitive cubic unit cell has what percent occupied volume?
- ✔✔the least
A reaction is said to be reversible if the (reversible reactions) -
✔✔products of the reaction can react to form the original
reactants
A solid acid sample of an unknown purity can be analyzed by
titration with a standardized base (titrations of acids and
bases) - ✔✔the sample is weighed and dissolved in water
titration to endpoint with standardized base will make it
possible to calculate composition of unknown acid
A solution of 35.7 g of an organic non electrolyte in 220 g of
chloroform has a boiling point of 64.5˚C. What is the molar
mass of the solute? (normal boiling point of chloroform is
61.26˚C, the boiling point elevation constant for chloroform is
3.63˚C/m) - ✔✔182 g/mole
Abscissa - ✔✔the x value
,Al(OH)4- is (reversible reactions) - ✔✔insoluble, however is
amphoteric
Amorphous Solid - ✔✔has no regular structure
Amphoteric (reversible reactions) - ✔✔dissolves in both acid
and bases
An insoluble salt of a weak acid may frequently be dissolved
by (reversible reactions) - ✔✔the use of a strong acid
An insoluble salt of a weak acid may frequently be dissolved
by the use of a strong acid, write a balanced equation showing
an example of this statement - ✔✔CaCO3(s) <---> Ca2+(aq) +
CO3 2-(aq)
an acid will react with the CO3 2- and produce HCO3- which
will decrease the amount of a product shifting the reaction to
the products side and thus dissolve more of the CaCO3
An unknown metal is oxidized spontaneously with Cd2+ being
reduced to Cd, the Ecell is measure to be .337V, what is the
, Ered of the unknown metal ion to the elemental metal? What
reaction occurs at the cathode? - ✔✔Cd2+ to Cd
Ered= -.403V
thus .337V= -.403V +Eox
Eox= .74V
reduction half reaction, unknown metal cation being reduced
to the unknown metal
As a result of lowering the vapor pressure, more energy must
be supplied to the solution to cause the vapor pressure to
equal atmospheric pressure, what is a result of this?
(colligative properties) - ✔✔the solution will have a higher
boiling point than the pure solvent
As electrons flow through the wire from the copper electrode
toward the silver electrode (electrochemistry) - ✔✔negative
ions (nitrate from salt bridge/silver half cell) will migrate
through the solution and the salt bridge toward the excess
positive charge that is being produced around the copper
electrode as copper(II) ions are formed
positive ions (Ag+, Cu2+, potassium ions from salt bridge) will
migrate toward the silver half cell where an excess of negative
charge is building up as silver ions are removed from the silver
nitrate solution to form silver metal
