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在第四章,同学们已经学过用求最小公倍数法配平化学方程式。但若碰到的是复杂的化学方程式,要配平可就不那么容易了。其实,在遇到复杂化学方程式时,我们还是选用求最小公倍数法并借助于观察法(必要时借助于代数法)来配平。 用求最小公倍数法配平复杂化学方程式,关键是选准配平的起点,即选准首先要配平的元素。那么,怎样选配平的起点呢?请同学们记住:应选式子左右两边各出现一次且原子个数较多的不平衡元素作为配平的起点。显然,作为首先要配平的元素必须具备三个条件:
In the fourth chapter, the students have learned to use the least common multiple method to balance the chemical equation. However, if you are dealing with a complex chemical equation, it may not be easy to balance it. In fact, in the face of complex chemical equations, we still choose to use the least common multiple method and rely on the observation method (with algebraic method if necessary) to balance. Using the least common multiple method to balance the complex chemical equations, the key is to choose the starting point for the trimming, that is, the element to be trimmed first. Then, how do you choose the starting point of the match? Ask the students to remember that the unbalanced elements that appear on the right and left sides of the formula once and have more atoms are used as the starting point for the balance. Obviously, as the first element to be trimmed, there must be three conditions: