1. Which reaction(s) is/are exothermic? Select all that apply.
ΔHf° in kJ/mol at 25°C
MgO |
-601 |
Fe2O3(s) |
-824 |
Ag2O (s) |
-31 |
Al2O3(s) |
-1676 |
Group of answer choices
a. 6Ag(s) + Fe2O3(s) --> 3Ag2O(s) + 2Fe(s)
b. 2Al(s) + Fe2O3(s) --> Al2O3(s) + 2Fe(s)
c. 3Mg(s) + Fe2O3(s) --> 3MgO(s) + 2Fe(s)
2. Which metal requires the most energy to extract (i.e. return to it's metallic form) from it's ore?
Reaction |
ΔHf° kJ/mol metal oxide |
2Au(s) + 3/2 O2(g) --> Au2O3(s) |
+131 |
2Ag(s) + 1/2 O2(g) --> Ag2O (s) |
-31 |
Cu(s) + 1/2 O2(g) --> CuO(s) |
-157 |
Pb(s) + 1/2 O2(g) --> PbO(s) |
-217 |
Sn(s) + O2(g) --> SnO2(s) |
-578 |
2Fe(s) + 3/2 O2(g) --> Fe2O3(s) |
-824 |
2Al(s) + 3/2 O2(g) --> Al2O3(s) |
-1676 |
Group of answer choices
a. aluminum
b. gold
c. lead
d. iron
3. Which of the following statements are true about making H2O(g) from H2O(l)? Select all that apply.
Group of answer choices
a. The process requires the transfer of +40.7 kJ/mol to the liquid water.
b. The process involves breaking covalent bonds O-H bonds. Therefore you can use bond energies to determine the heat of the reaction.
c. The number of intermolecular attractions between water molecules decreases in the process.
1. Which reaction(s) is/are exothermic? Select all that apply. ΔHf° in kJ/mol at 25°C MgO -601...
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