How does a catalyst influence a chemical reaction? It speeds up or slows down a chemical reaction by direct participation. It reacts with products to increase the concentration of reactants. It decreases the amount of energy necessary for the reaction to proceed. It increases the total amount of products formed.
Answers
Answer:
it speeds up or slows down the chemical reaction
Explanation:
The catalyst influences a chemical reaction as -It speeds up or slows down a chemical reaction by direct participation.
It reacts with products to increase the concentration of reactants.
Catalyst does not react with products, hence this statement is incorrect.
It decreases the amount of energy necessary for the reaction to proceed.
It is not always true. Sometimes, the energy required may be decreased, but sometimes the energy requirement can be increased with the addition of catalyst.
It increases the total amount of products formed.
Catalysts are obtained in the same amount as they were added at the end of chemical reaction. Thus, it cannot increase the amount of products formed.
What is Catalyst?
A catalyst is a substance that does not participate chemically in the reaction but increases or decreases the rate of the reaction.
For example, the decomposition of potassium chlorate into potassium chloride is a very slow reaction. Additionally, it requires a temperature of about 653-873 K.
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However, addition of little manganese dioxide reduces the temperature range to 473-633 K. Besides, the rate of reaction is also increased. At the end of the reaction, the mass and composition of manganese dioxide remain as it is. Hence, it can be called a catalyst.
Thus, catalyst speeds up or slows down a chemcical reaction by direct participation.