字母反应式是指用字母来代表物质的化学式,并以此表示化学反应的式子,或者说,在化学反应式中,部分或全部化学式是用字母代表的.字母反应式的解题要求一般是判断反应式中的字母代表何种物质,所以字母反应式题实际上是物质推断题,与框图推断题有异曲同工之妙. Letter reaction refers to a chemical formula that represents a substance by letters and represents a formula of a chemical reaction. Or, in chemical reactions, some or all of the chemical formulas are represented by letters. The letter-resolved problem-solving requirements are general. It is to judge what kind of substance the letter in the reaction formula represents, so the letter reaction question is actually a material inference question, and the block diagram inference question has the same meaning.