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在化学计算中,守恒法运用十分广泛,特别是有关混合物或反应关系复杂的化学试题。运用守恒法解题既可避免书写烦琐的化学方程式,提高解题的速度,又可避免在纷纭复杂的解题过程中寻找关系式,提高解题的准确度。中学化学计算中常见的守恒问题有如下几种情况。1.根据化学式中正负化合价总数相等。确立化学式例l透闪石的化学式为Ca_mMg_n(Si_4O_(11))_2(OH)_2,m和n的取值可能是()。A.1、2 B.3、2 C.2、4 D.2、5解析:据化学式中正负化合价总数绝对值相等有:2m+
In stoichiometry, Conservation Law is widely used, especially in relation to mixtures or complex chemical reactions. The use of conservation law to solve problems can avoid cumbersome chemical equations written to improve the speed of problem-solving, but also to avoid the complex problem-solving process to find the relationship between the problem-solving to improve the accuracy. The common problems of conservatism in secondary school chemistry are as follows. 1. According to the chemical formula in the total number of equal valence. The established chemical formula l tremolite chemical formula is Ca_mMg_n (Si_4O_ (11)) _2 (OH) _2, m and n values may be (). A.1,2 B.3,2 C.2,4 D.2,5 Analysis: According to the chemical formula of the total number of positive and negative valences equal to the absolute: 2m +