如何翻译：物质发生化学变化是旧键的断裂新键的形成过程。

物质发生化学变化是旧键的断裂新键的形成过程。在氧化还原反应中反应物发生化学变化伴随着电子的转移，电子的转移数与物质的结构有关，并决定物质的化学性质。当反应达到一定的程度，化学反应即将停止，此时即为化学平衡。

翻译成英文

第一句不是机译的,参考..

物质发生化学变化是旧键的断裂新键的形成过程。在氧化还原反应中反应物发生化学变化伴随着电子的转移，电子的转移数与物质的结构有关，并决定物质的化学性质。当反应达到一定的程度，化学反应即将停止，此时即为化学平衡。
Material occurs to a chemical change is a process of the old chemical bond to cut off and the new old chemical bond to become.In redox reactions in chemical reaction changes accompanied by electronic transfer, electronic transfer of material and the structure and chemical properties of substances decision. When the reaction to a certain extent, chemical reaction will be discontinued, at this time is the chemical balance.

A chemical change is a process in which reactants are changed into one or more different products.
这话也许对楼主有点参考作用.(化学变化的定义)

化学反应将形成新物质，新物质的化学键与旧物质的化学键必然不同，所以要这么说。

Material and chemical changes in the old bond fracture the formation of the new bond. In redox reactions in chemical reaction changes accompanied by electronic transfer, electronic transfer of material and the structure and chemical properties of substances decision. When the reaction to a certain extent, chemical reaction will be discontinued, at this time is the chemical balance.