自秋转对 SEC 2 Mechanism A mechanism is the 'story'of how a reaction takes place. A mechanism describes how a reaction takes place by showing what is happening to valence electrons during the formation and breaking of bonds
SEC 2 Mechanism ◼A mechanism is the 'story' of how a reaction takes place. ◼A mechanism describes how a reaction takes place by showing what is happening to valence electrons during the formation and breaking of bonds
自秋特大材 SEC 2 Mechanism The following rules are worth remembering when drawing arrows ■curly(弯曲)arrows show the movement of electrons,not atoms; curly arrows start from the source of two electrons (i.e.a lone pair of electrons on an atom or the middle of a bond which is about to be broken) Fig.2.Mechanism for the reaction of a hydroxide ion with a proton. Fig.3.Incorrect way of drawing a curly arrow
SEC 2 Mechanism The following rules are worth remembering when drawing arrows ◼ curly (弯曲) arrows show the movement of electrons, not atoms; ◼ curly arrows start from the source of two electrons (i.e. a lone pair of electrons on an atom or the middle of a bond which is about to be broken);
SEC 2 Mechanism curly arrows point to an atom if the electrons are going to end up as a lone pair on that atom; curly arrows point to where a new bond will be formed if the electrons are being used to form a new bond H3C Fig.4.Mechanism for the reaction of a hydroxide ion with ethanoic acid
SEC 2 Mechanism ◼ curly arrows point to an atom if the electrons are going to end up as a lone pair on that atom; ◼ curly arrows point to where a new bond will be formed if the electrons are being used to form a new bond