Explain positive and negative catalysis with example??
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A catalyst which increases the rate of reaction is called positive catalyst. Such catalyst decreases activation energy by accepting a smaller path, so rate of reaction is increased.
example _____Temperature . Most chemical reactions can be accelerated without altering their products, only by increasing the temperature of the reaction medium. For this reason the decomposition of matter occurs more rapidly in the tropics.
The enzymes . Segregated naturally by the body of living beings, enzymes play an important catalytic role, accelerating vital processes that, if occurring on their own, would require temperatures often incompatible with life. (see: digestive enzymes
ii) Negative catalysts (Inhibitors):
A catalyst which decreases or retards the rate of reaction is called negative catalysts
ex...___;_Temperature . Just as the increase in temperature accelerates chemical processes , the decrease in retards them. This is the principle of refrigeration, for example, which prolongs the life of food by keeping it at a low temperature.
Citric acid . Acid from lemon and other citrus fruits slows down the oxidation process of organic matter .
Enzyme inhibitors . Biological substances that are coupled to enzymes and reduce their activity, to stop chemical or biological processes. They are often used to fight pathogenic microorganisms , inhibiting some key process for their reproduction.