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3 years ago

Identify the oxidizing and reducing agents in this reaction: Cr2O3(s) + 2Al(s) 2Cr(s) + Al2O3(s)

Chemistry

2 answers:

DiKsa [7]3 years ago

7 0

In this reaction, Cr2O3 is the oxidizing agent which will oxidize Al to Al2O3.

Al is the reducing agent that will reduce Cr2O3 to Cr.

An oxidizing agent has the property of oxidizing another molecule (giving it one or more oxygen atoms) by being reduced.

A reducing agent has the property of reducing another molecule (by removing one or more oxygen molecules) by being oxidized.

aivan3 [116]3 years ago

3 0

Cr2O3+ 2Al -----------> 2Cr+ Al2O3

Cr2O3--------2Cr.
( oxidation no. of cr +3 to +1 means hain of electron so it act as oxidizing agent)

similarly,

2Al------> Al2O3
( oxidation no. of Al +1 to +3 means loss of electron so it act as reducing agent)

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pychu [463]

The solution for this problem is:
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Marta_Voda [28]

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3 years ago

Which electron transition represents a gain of energy

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The transition from lower energy level to higher energy level require a gain of energy.

Explanation:

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Excitation:

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De-excitation:

When the excited electron fall back to the lower energy levels the energy is released in the form of radiations. this energy is exactly equal to the energy difference between the orbits. The characteristics bright colors are due to the these emitted radiations. These emitted radiations can be seen if they are fall in the visible region of spectrum.

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4 years ago

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Explanation:

To decrease the temperature of the solution there are necessaries:

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Where x are grams of NH₄NO₃ you need to add and Y is the energy that you need to decrease the heat.

Also, the energy Y will be:

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I hope it helps!

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