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General Chemistry – Unit 9 Review
Balance the following equations:
1. _____ Fe + _____ O2 → _____ Fe2O3
2. _____ KOH + _____H2SO 4 → _____ K2SO4 + _____ H2O
3. _____ C4H5OH + _____ O2 → _____ CO2 + _____ H2O
4. _____ Cu + ______ AgNO3 → _____Ag + _____ Cu(NO3)2
Write and balance the equation, then identify the reaction type. Draw
Particle diagrams for #5 and #6
5. Propane gas, C3H8, burns in air to produce gaseous carbon dioxide and water.
6. Silver nitrate in aqueous solution reacts with lead (II) chloride in aqueous solution to produce
solid silver chloride and lead (II) nitrate in aqueous solution.
7. Copper metal reacts with hydrochloric acid top produce copper (II) chloride and hydrogen gas.
8. Magnesium metal reacts with oxygen gas to produce solid magnesium oxide.
Modeling Chemistry
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U9 gen rev v.pp
9. Calcium carbonate decomposes into solid calcium oxide and carbon dioxide gas when heated.
10. Hydrochloric acid reacts with calcium hydroxide to produce calcium chloride and water.
Write and balance the following equations, identify the reaction type,
draw the energy bar charts that illustrate the reaction.
11. Magnesium oxide is strongly heated to form magnesium metal and oxygen gas.
12. The complete combustion of butanol, C4H9OH.
13. According to Collision Theory, what two things must occur in order for reactants to
become products?
14.
E ch
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U9 gen rev v.pp
On the graph above, you should represent an endothermic reaction, showing the
potential energy of the reactants, activated complex and products, as well as the Ea
and ∆H.
You also learned to show the transfer of energy between kinetic and chemical
potential accounts at various stages of the reaction. You should sketch energy bars
that are consistent with the graph you did above (an endothermic reaction).
Reactants
Eth Eph Ech
System
Activated Complex
Eth Eph Ech
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System
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Products
Eth Eph Ech
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Which side of the reaction would the energy term be placed? __________________
Do the reactants or products store more chemical potential energy? ___________
Now do the same for an exothermic reaction.
E ch
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Be sure to label potential energy of the reactants, activated complex and products, as
well as the Ea and ∆H. How does the sign of ∆H for this reaction compare to that
for the endothermic reaction?
You should sketch energy bars that are consistent with the graph you did above (an
exothermic reaction).
Reactants
Eth Eph Ech
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Modeling Chemistry
System
Activated Complex
Eth Eph Ech
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System
Products
Eth Eph Ech
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U9 gen rev v.pp
Which side of the reaction would the energy term be placed? __________________
Do the reactants or products store more chemical potential energy? ___________
Modeling Chemistry
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U9 gen rev v.pp