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在中学化学的知识体系中,可逆反应一直是教学的重点和难点,而化学平衡由于其灵活多变,影响因素多更成为难中之难。在化学平衡类的习题中,如求解诸如反应速率、转化率、各组分的质量分数、物质的量浓度等等,在已知条件中又加入时间、浓度、温度、压强以及催化剂等种类繁多的影响因素,就更使得该类习题灵活多变,令学生难以掌握。在历年的高考题
In middle school chemical knowledge system, reversible reaction has always been the teaching of the key and difficult, and chemical balance because of its flexibility, the impact of more factors become more difficult. In the chemical equilibrium class of exercises, such as the solution such as reaction rate, conversion rate, the mass fraction of each component, the concentration of substances, etc., under the known conditions and time, concentration, temperature, pressure and a wide range of catalysts Of the factors that make this type of exercises even more flexible and make it difficult for students to master. In the calendar year college entrance examination questions