反应物是化学反应的起始原料。 反应物经历化学变化,其中化学键被破坏并且形成新的化学键以制造产物。 在化学方程式中,反应物列在箭头左侧,而产品位于右侧。 如果化学反应具有指向左侧和右侧的箭头,则箭头两侧的物质是反应物以及产物(反应同时在两个方向上进行)。 在平衡的化学方程式中,每种元素的原子数对于反应物和产物是相同的。
“反应物”一词最早在1900 – 1920年左右开始使用。 术语“试剂”有时可互换使用。在该等式中保留了基本质量。 在等式的反应物和产物侧有2个氢原子和2个氧原子。 在每个化学式之后陈述物质的状态(s =固体,l =液体,g =气体,aq =水溶液)。

新西兰坏卡托大学化学Essay代写:反应物定义和实例

Reactants are the starting materials in a chemical reaction. Reactants undergo a chemical change in which chemical bonds are broken and new ones formed to make products. In a chemical equation, reactants are listed on the left side of the arrow, while products are on the right side. If a chemical reaction has an arrow that points both left and right, then substances on both sides of the arrow are reactants as well as products (the reaction proceeds in both directions simultaneously). In a balanced chemical equation, the number of atoms of each element is the same for the reactants and products.The term “reactant” first came into use around 1900-1920. The term “reagent” is sometimes used interchangeably.Notice mass is conserved in this equation. There are 4 atoms of hydrogen in both the reactant and product side of the equation and 2 atoms of oxygen. The state of matter (s = solid, l = liquid, g = gas, aq = aqueous) are stated following each chemical formula.

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