combustion of organic oils.
instantaneous
The symbol is referred to as "delta" and means that the reaction occurs under heating conditions.
There are many different types of antacids, each with a slightly different mechanism of action. All of these neutralize stomach acid (HCl) through some reaction. The Example below uses calcium carbonate, which is used in the popular antacid "Tums". 2 HCl + CaCO3 --> CaCl2 + H2O + CO2 A way to envision this reaction is that the hydrochloric acid "eats away" at the calcium carbonate, forming CaCl2, an ionic species, and H2CO3 (carbonic acid) which is not stable at standard conditions. This rapidly decays to H2O and CO2 at normal pressures (like when you open a can of soda), which is why these are written on the products side of the reaction.
No reaction occurs.
When water is removed, dehydration is a type of reaction that occurs.
Platinum
If the reaction occurs in the gas phase
instantaneous
It depends upon what you mean. H2O contains oxygen and alkali metals react explosively with it. Also, burning is formally called oxidation. Both happen rapidly and I hope I answered your intended question.
Atomic hydrogen at standard atmospheric conditions occurs in the form of H2, a gas.
Silver tarnish occurs when silver turns black, caused by oxidation when it is exposed to the air. Tarnish can be removed by rubbing the silver with polish and a soft cloth.
The symbol is referred to as "delta" and means that the reaction occurs under heating conditions.
There are many different types of antacids, each with a slightly different mechanism of action. All of these neutralize stomach acid (HCl) through some reaction. The Example below uses calcium carbonate, which is used in the popular antacid "Tums". 2 HCl + CaCO3 --> CaCl2 + H2O + CO2 A way to envision this reaction is that the hydrochloric acid "eats away" at the calcium carbonate, forming CaCl2, an ionic species, and H2CO3 (carbonic acid) which is not stable at standard conditions. This rapidly decays to H2O and CO2 at normal pressures (like when you open a can of soda), which is why these are written on the products side of the reaction.
Reaction Rate
No reaction occurs.
When water is removed, dehydration is a type of reaction that occurs.
There are several reasons you might want to control the rate of a chemical reaction: A) the reaction occurs very slowly in normal conditions (like rusting) but you want to do it more quickly (like fake antiques). B) the reaction normally occurs quickly, but you want to slow it down so it lasts longer (like in some batteries) C) most reactions can be more or less efficient depending on the reaction rate and other conditions, often (like in engines) you want the reaction rate that will be most efficient under a set of given conditions. D) some reactions might be more difficult to manage unless they are slowed down.