论文部分内容阅读
综观近年的高考试题,离子问题一直是高考命题的宠儿,静下心来仔细研究一番,不难发现离子方程式的正误判定和离子共存问题常考不衰,而且随着新课程标准的全面推广,有关离子浓度的大小比较、离子检验及与化学平衡常数结合在一起的离子问题也不断闪现,为了能够更好地迎战新一届高考,笔者对近年各地高考题进行了细心研究,摘来几题,以飨读者。一、对离子方程式的正误判定进行考查离子方程式书写错误通常集中在违反反应原理、质量不守恒、电荷不守恒、物质拆分不对、漏掉并发反应、忽视过量问
Looking at recent college entrance examination exam questions, ion problem has been the darling of the college entrance examination proposition, stop and carefully study it, not difficult to find the positive and negative ion ion equation and ion coexistence problems often test is not bad, but with the full promotion of the new curriculum standards, The size of the ion concentration, ion testing and chemical equilibrium constant ion problems also continue to flash, in order to be able to better meet the new college entrance examination, the author of the college entrance examination in recent years conducted a careful study, picked off a few questions To 飨 readers. First, the positive and negative ion ion equation to determine the test Ionic equation writing errors are usually concentrated in violation of the reaction principle, the quality of conservation, the charge is not conserved, the material is not split, missed the concurrent reaction, ignoring the excess