UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
Hexane is commonly used in labs as a solvent for nonpolar compounds.
What is the molality of 22.3 mg of vitamin D (C27H44O, 384.6 g/mol)
in 50.0 mL of hexane. Hexane has a density of 0.661 g/mL.
A. 1.75 x 10-3 m
B. 1.16 x 10-3 m
C. 8.77 x 10-2 m
D. 9.83 x 10-4 m
A. 1.75 x 10-3 m
(Ref: Week 2 Quiz)
Molality = mol solute/kg solvent
END OF
PAGE
1
, UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
What is a catalyst?
A substance that increases the rate of a reaction without itself being
consumed by the reaction. So it can be a reactant in the first step of a
reaction and a product in the last step.
Lowers Ea - Activation Energy, of a reaction
Homogenous - same phase as reactants
Heterogenous - different phase than the reactants (usually a solid) Ex:
catalytic converter
In the production of iron from iron ore, iron oxide can be reacted with
carbon in a blast furnace to produce molten iron and carbon monoxide
gas:Fe2O3(s) + 3C(s) ⟶ 2Fe(l) + 3CO(g)
END OF
PAGE
2
, UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
What is the rate expression that relates the consumption of C to the
production of Fe?:
A. -1/3 ∆[C]/∆t = 1/2 ∆[Fe]/∆t
B. -∆[C]/∆t = 1/2 ∆[Fe]/∆t
C. -1/3 ∆[C]/∆t = ∆[Fe]/∆t
D. -1/2 ∆[C]/∆t = 1/3 ∆[Fe]/∆t
A. -1/3 ∆[C]/∆t = 1/2 ∆[Fe]/∆t
(Ref: Week 3 Quiz)
Stoichiometry leads to the answer. Reactants are mostly negative and
products are mostly positive.
END OF
PAGE
3
, UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
The reaction rate that is calculated at any specified time while the
reaction is proceeding is the
A. average rate
B. instantaneous rate
C. initial rate
D. rate constant
B. instantaneous rate
(Ref: Week 3 Quiz)
END OF
PAGE
4
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
Hexane is commonly used in labs as a solvent for nonpolar compounds.
What is the molality of 22.3 mg of vitamin D (C27H44O, 384.6 g/mol)
in 50.0 mL of hexane. Hexane has a density of 0.661 g/mL.
A. 1.75 x 10-3 m
B. 1.16 x 10-3 m
C. 8.77 x 10-2 m
D. 9.83 x 10-4 m
A. 1.75 x 10-3 m
(Ref: Week 2 Quiz)
Molality = mol solute/kg solvent
END OF
PAGE
1
, UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
What is a catalyst?
A substance that increases the rate of a reaction without itself being
consumed by the reaction. So it can be a reactant in the first step of a
reaction and a product in the last step.
Lowers Ea - Activation Energy, of a reaction
Homogenous - same phase as reactants
Heterogenous - different phase than the reactants (usually a solid) Ex:
catalytic converter
In the production of iron from iron ore, iron oxide can be reacted with
carbon in a blast furnace to produce molten iron and carbon monoxide
gas:Fe2O3(s) + 3C(s) ⟶ 2Fe(l) + 3CO(g)
END OF
PAGE
2
, UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
What is the rate expression that relates the consumption of C to the
production of Fe?:
A. -1/3 ∆[C]/∆t = 1/2 ∆[Fe]/∆t
B. -∆[C]/∆t = 1/2 ∆[Fe]/∆t
C. -1/3 ∆[C]/∆t = ∆[Fe]/∆t
D. -1/2 ∆[C]/∆t = 1/3 ∆[Fe]/∆t
A. -1/3 ∆[C]/∆t = 1/2 ∆[Fe]/∆t
(Ref: Week 3 Quiz)
Stoichiometry leads to the answer. Reactants are mostly negative and
products are mostly positive.
END OF
PAGE
3
, UNE - CHEM 1011 - LATEST
MIDTERM STUDY GUIDE
QUESTIONS AND
ANSWERS 2026 - 2027
The reaction rate that is calculated at any specified time while the
reaction is proceeding is the
A. average rate
B. instantaneous rate
C. initial rate
D. rate constant
B. instantaneous rate
(Ref: Week 3 Quiz)
END OF
PAGE
4
