Enzymes are added to a chemical reaction to lower the activation energy. what is an enzyme classified as?
a) a catalyst
b) an inhibitor
c) an accelerator
d) a depressant

A) a catalyst

Explanation:

A) Enzymes are also called as bio catalysts and thus increases the rtae of reaction in living beings.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.

B) An inhibitor  decreases the rate of reaction.

C) an accelerator  increases the rate of reaction.

D) a depressant decreases the rate of reaction.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock