Which of the statements is correct regarding catalysts ( click 4 that apply )

Catalyst increase the rate of reaction

Catalyst decrease the rate of reaction

Catalyst increase the activation energy needed to start a reaction

Catalyst decrease the activation energy needed to start a reaction

They are used up in the reaction

They are not used up in the reaction

Catalyst are very specific

Catalyst are not very specific

Catalyst increase the rate of reaction

Catalyst decrease the activation energy needed to start a reaction

They are not used up in the reaction

Catalyst are not very specific

Explanation:

From the basic chemistry it is known Catalysts are substance that accelerates the rate of reaction without altering the nature of reaction.

Catalysts decreases the energy required for activation, in order to make collisions quicker.

Then, Catalyst just alters the rate of reaction alone and doesn't takes part in the chemical reaction.

Some catalysts are specific. But in general most of the catalysts are not specific in nature.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

a