Reaction mechanism

In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical change occurs.

A chemical mechanism describes in detail exactly what takes place at each stage of an overall chemical reaction (transformation). It also describes each reactive intermediate, activated complex, and transition state, and which bonds are broken (and in what order), and which bonds are formed (and in what order). A complete mechanism must also account for all reactants used, the function of a catalyst, stereochemistry, all products formed and the amount of each. It must also describe the relative rates of the reaction steps and the rate equation for the overall reaction. Reaction intermediates are chemical species, often unstable and short-lived, which are not reactants or products of the overall chemical reaction, but are temporary products and reactants in the mechanism's reaction steps. Reaction intermediates are often free radicals or ions. Transition states can be unstable intermediate molecular states even in the elementary reactions. Transition states are commonly molecular entities involving an unstable number of bonds and/or unstable geometry. They correspond to maxima on the reaction coordinate, and to saddle points on the potential energy surface for the reaction.

单词	Chemical mechanism
释义	Chemical mechanism 原声例句科学世界 But our bodies have many chemical mechanisms in place to not only put us to sleep, but wake us up as well. 我们的身体有许多化学机制来控制睡眠，与清醒的时间。 2014 English Cafe They're corroding " not quickly, necessarily." He says the scientists need to learn " the chemical mechanisms." 它们腐蚀“不是很快，而是必然的” 。他说科学家们需要学习“化学机制” 。 2014 English Cafe " Chemical mechanisms, " then, are the processes that the chemicals in the daguerreotypes are going through and how they were produced to begin with. 那么，“化学机制”就是银版照片中化学物质所经历的过程，以及它们最初是如何产生的。 iBT新托福突破口 Now, although the Spartinas have adapted several chemical and physical mechanisms that allow them to thrive in salt water and to feed oxygen to their roots. 现在，尽管 Spartinas 已经采用了几种化学和物理机制，使它们能够在盐水中茁壮成长并为它们的根部提供氧气。英语百科 Reaction mechanism In chemistry, a reaction mechanism is the step by step sequence of elementary reactions by which overall chemical change occurs. A chemical mechanism describes in detail exactly what takes place at each stage of an overall chemical reaction (transformation). It also describes each reactive intermediate, activated complex, and transition state, and which bonds are broken (and in what order), and which bonds are formed (and in what order). A complete mechanism must also account for all reactants used, the function of a catalyst, stereochemistry, all products formed and the amount of each. It must also describe the relative rates of the reaction steps and the rate equation for the overall reaction. Reaction intermediates are chemical species, often unstable and short-lived, which are not reactants or products of the overall chemical reaction, but are temporary products and reactants in the mechanism's reaction steps. Reaction intermediates are often free radicals or ions. Transition states can be unstable intermediate molecular states even in the elementary reactions. Transition states are commonly molecular entities involving an unstable number of bonds and/or unstable geometry. They correspond to maxima on the reaction coordinate, and to saddle points on the potential energy surface for the reaction.
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Chemical mechanism

Reaction mechanism