Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 joule seconds, the speed of light is 2.998 x 108 m/s)

Answer: Option (2) is the correct answer.

Explanation:

Activation energy is the minimum amount of energy required to start or initiate a chemical reaction.

Whereas a catalyst helps in increasing the energy of reactant molecules so that they can overcome activation energy barrier and actively participate in the reaction.

Hence, adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate.

Adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate, as catalysts speed up chemical reactions by lowering the required activation energy. The correct answer to the given question is option (2) a decrease in activation energy and an increase in the reaction rate

In the world of Chemistry, a catalyst is a substance that increases the speed of a chemical reaction without itself undergoing any permanent chemical change. It achieves this acceleration by lowering the activation energy required for the reaction to occur. Therefore, adding a catalyst to a chemical reaction results in a decrease in activation energy and an increase in the reaction rate (option 2).

The activation energy is the minimum amount o f energy required for a chemical reaction to proceed. By lowering this energy barrier, a catalyst allows the reaction to proceed more quickly, in other words, it increases the rate of the reaction.

The correct answer to the given question is option (2) a decrease in activation energy and an increase in the reaction rate

For more such questions on catalyst, click on:

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Answer:

It allows migration of ions from one half–cell to the other.

Explanation:

Answer:

PCI5

Explanation:

Answer:

2.89 × 10²³ atoms of zinc

Explanation:

The number of atoms of zinc can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.48 × 6.02 × 10²³

We have the final answer as

2.89 × 10²³ atoms of zinc

Hope this helps you

Answer:

2.89× 10²³ atom

Explanation:

Given data:

Number of atoms of Zn = ?

Number of moles of Zn = 0.48 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

For example,

1 mole = 6.022 × 10²³ atom

0.48 mol ×  6.022 × 10²³ atom / 1mol

2.89× 10²³ atom

The frequency of collisions between the N₂ and H₂ molecules will decrease and the rate of reaction will also decrease.

Since the water is cooler than the gas mixture, heat will flow from the gas to the water.

The gas will cool down, so the average kinetic energy of the gas molecules will decrease.

The molecules will be moving more slowly, so there will be fewer collisions and fewer of these collisions will have enough energy to react.

The rate of reaction between H₂ and N₂ molecules at room temperature is exceedingly slow, but cooling the gas mixture will make the reaction even slower.

Answer:

A beaker containing a mixture of N2(g) and H2(g) is cooled by placing it in a tray of cold water. In response to the cooling, the likely number of collisions between the molecules of N2(g) and H2(g) will  decrease. The rate of the reaction will  decrease.

Explanation:

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