An ice wedge shattering a slab of shale

a
Chemical Change
b
Physical Change

Physical Change

Explanation:

Its a physical change because it is not changing its molecular structure it is only changing the shape of the shale.

since electrons are negative the answer is neagtaive

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.