It is a popping resonating sound generated by a lean condition on deceleration. When you suddenly close the throttle, the incoming air is choked off and the closed throttle also causes the bike to return to idle on the very lean idle circuit.
The reactivity series of metals was deduced by performing several experiments in the lab which enabled scientists to arrange metals according to their reactivity with dilute acid, oxygen (air), and water.xides of iron and copper are insoluble. Metals that are less reactive than copper like silver, gold and platinum do not react with oxygen. Note: When aluminum reacts with oxygen, a layer of aluminum oxide adheres and covers the aluminum.
The activity series of metals is an empirical tool used to predict products in displacement reactions and reactivity of metals with water and acids in replacement reactions and ore extraction.It can be used to predict the products in similar reactions involving a different metal.The activity series is a chart of metals listed in order of declining relative reactivity. The top metals are more reactive than the metals on the bottom.For example, both magnesium and zinc can react with hydrogen ions to displace H 2 from a solution by the reactions: Mg(s) + 2 H + (aq) â H 2 (g) + Mg 2+ (aq).he activity series is a chart of metals listed in order of declining relative reactivity. The top metals are more reactive than the metals on the bottom. For example, both magnesium and zinc can react with hydrogen ions to displace H 2 from a solution by the reactions: Mg(s) + 2 H + (aq) â H 2 (g) + Mg 2+ (aq).