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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