Table 9
South Pasadena ( AP Chemistry Name _________________________________
Period ___ Date ___/___/___
16 ( Chemical Equilibrium
ANSWERS to THE I.C.E. BOX
The ICE box is an organizational tool to keep track of chemicals before, during, and after a chemical reaction.
Consider the reaction:
2N2O(g) + O2(g) [pic] 4NO(g)
If we started with 1.0 M N2O and 1.0 M O2 only, the reaction might go until we have 2.0 M NO.
Follow the steps. Make sure you know what happened in each step.
Notice that only the “change” row matches the coefficients in the equation.
2N2O(g) + O2(g) [pic] 4NO(g)
|initial |1.0 |1.0 |0 |
|change | | | |
|ending | | |2.0 |
2N2O(g) + O2(g) [pic] 4NO(g)
|initial |1.0 |1.0 |0 |
|change | | |+2.0 |
|ending | | |2.0 |
2N2O(g) + O2(g) [pic] 4NO(g)
|initial |1.0 |1.0 |0 |
|change |-1.0 |-0.5 |+2.0 |
|ending | | |2.0 |
2N2O(g) + O2(g) [pic] 4NO(g)
|initial |1.0 |1.0 |0 |
|change |-1.0 |-0.5 |+2.0 |
|ending |0 |0.5 |2.0 |
Try these other problems.
1)
2N2O(g) + O2(g) [pic] 4NO(g)
|initial |2.0 |2.0 |0 |
|change |-1.0 |-0.5 |+2.0 |
|ending |1.0 |1.5 |2.0 |
2)
2N2O(g) + O2(g) [pic] 4NO(g)
|initial |2.0 |2.0 |0 |
|change |-1.0 |-0.5 |+2.0 |
|ending |1.0 |1.5 |2.0 |
3)
N2(g) + 3H2(g) [pic] 2NH3(g)
|initial |2.0 |2.0 |0 |
|change |-0.5 |-1.5 |+1.0 |
|ending |1.5 |0.5 |1.0 |
4)
N2(g) + 3H2(g) [pic] 2NH3(g)
|initial |1.0 |2.0 |0 |
|change |-0.5 |-1.5 |+1.0 |
|ending |0.5 |0.5 |1.0 |
5)
MgCO3 [pic] MgO + CO2
|initial |2.0 |0 |0 |
|change |-1.5 |+1.5 |+1.5 |
|ending |0.5 |1.5 |1.5 |
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