Asolid is placed in a solution. which observation most likely indicates that a chemical reaction has occurred?
a) the size of the solid has rapidly decreased.
b) the color of the solution has not changed.
c) the solid has bubbles forming on its surface.
d) the temperature of the solution stays the same.

Answer;

C) The solid has bubbles forming on its surface.

Explanation;

-Chemical reactions involves the reaction of reactants that involves rearrangement of their structure resulting to the formation of new substances.

-There are a number of common indicators that are used to show that a chemical reaction has taken place, namely;

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.

b. is the answer hoped i