Select the correct answer.
For the reaction PC15(e) + heat - PC13(e) + Cl2ce), what will happen when the temperature is decreased?
OA.
There will not be a shift in equilibrium.
OB.
There will be a shift toward the products.
OC.
There will be a shift toward the reactants.
OD. Not enough information is given.
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Explanation:

The reaction is:

The application of LeChatelier's principle leads to consider the heat as a reactant or a product depending on if it is on the left side or the right side.

In this reaction, the heat is on the left side, thus it must be considered a reactant.

Decreasing the temperature is equivalent to remove or consume heat. Thus, the reaction must shif to the left to compensate that reduction of heat. That is the reverse reaction shall be favored.

In conclusion, there will be a shift toward the reactants.

c. is the answer

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qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.