UNE - CHEM 1011 - MIDTERM STUDY GUIDE QUESTIONS AND ANSWERS

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
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, 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)


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, 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.
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, 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)



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