Leader: Katie
Course: Chem 1777
Supplemental Instruction
Instructor: Burnett
Iowa State University
Date: March 1st, 2010
1. Complete and balance the following molecular reaction equations. Make sure to include
all of the phases and products.
𝐴𝑔3 𝑃𝑂4 (𝑎𝑞) + 𝐾𝑂𝐻 (𝑎𝑞) →
Practice Exam
Circle all of the correct terms describing the above reaction.
Combustion
combination
decomposition
metathesis
Acid/base
exchange
𝐻2 𝑆𝑂4 (𝑎𝑞) +
neutralization
redox
𝑆𝑟(𝑂𝐻)2 (𝑎𝑞) →
Circle all of the correct terms describing the above reaction.
Combustion
combination
decomposition
metathesis
Acid/base
exchange
neutralization
redox
2. Write the net ionic reaction equations for the following unbalanced molecular equation.
𝐻𝑁𝑂3 (𝑎𝑞) + 𝐴𝑙(𝑠) → 2𝐴𝑙(𝑁𝑂3 )3 (𝑎𝑞) + 3𝐻2 (𝑔)
3. Underline the species that is undergoing oxidation in the following reaction.
PbS(s) + 4𝐻2 𝑂2 (𝑎𝑞) → 𝑃𝑏𝑆𝑂4 (𝑠) + 4𝐻2 𝑂(𝑙)
4. All of the following are strong acids except…
a) HBr
b) 𝐻2 𝑆𝑂4
c) 𝐻𝐶𝑙
d) 𝐻𝐶𝑙𝑂4
e) 𝐻𝐼
5. Name a weak base.
6. Consider the following reaction: 2𝑀𝑔(𝑠) + 𝑂2 (𝑔) → 2𝑀𝑔𝑂(𝑠) ΔH = -397kJ
a) Is this reaction exothermic of endothermic?
b) Calculate the amount of heat transferred when 4.3g of Mg(s) reacts at constant
pressure.
c) How many grams of MgO are produced during an enthalpy change of -45 kJ?
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d) How many kilojoules of heat are absorbed when 5.70g of MgO(s) is decomposed into
Mg(s) and 𝑂2 (𝑔) at constant pressure?
7. If 25.8mL of 𝐴𝑔𝑁𝑂3 is needed to precipitate all the 𝐶𝑙 − ions in a 785mg sample of KCl
(forming AgCl), what is the molarity of the 𝐴𝑔𝑁𝑂3 solution?
8. The specific heat of cyclopropane is 8.16 J/g-K. How many J of heat are needed to raise
the temperature of 104.8g of cyclopropane from 32.6ºC to 94.5º?
9. What is the theoretical yield of precipitate if 0.500 g of solid NaOH is added to 50.0mL
of 0.200 molar iron (III) nitrate?
10. What is the empirical formula of a compound that is 25.9% N and 74.1% O?