A catalyst is:

2 answers:

7 0

A catalyst is a substance that increases the rate of a chemical reaction without itself being consumed . (ans: second choice)

qwelly [4]3 years ago

7 0

$\huge \mathrm{ \underline{Answer} ࿐}$

The correct option is B.

A Catalyst is a chemical which promotes or speed up a chemical reaction without undergoing any chemical reaction itself.

for example : potassium permanganate - Hydrogen peroxide will decompose into water and oxygen gas in the presence of KMnO4.

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Calculate the fraction of atoms in a sample of argon gas at 400 K that have an energy of 12.5 kJ or greater. Report your answer

emmainna [20.7K]

Answer:

0.023

Explanation:

The Arrhenius' equation states that:

$k = A*e^{\frac{-Ea}{RT}$

Where k is the velocity constant of the reaction, A is the constant of the collisions, Ea is the activation energy (the energy necessary to the molecules have so the reaction will happen), R is the gas constant (8.314 J/molK) and T is the temperature.

This equation is derivated of:

k = pZf

Where

p=fraction of collisions that occur with reactant molecules properly oriented

f=fraction of collisions having energy greater than the activation energy

Z=frequency of collisions

Thus, p*Z = A, and

f = $e^{\frac{-Ea}{RT} }$