Question

which is evidence that a chemical reaction has likely occurred? a liquid slowly losing volume the formation of a precipitate boiling water releasing steam a change in the shape of a solid

Explanation:

A chemical reaction results in the formation of new substances. Formation of a precipitate indicates a new solid - substance has been formed from a chemical change in solution. A liquid losing volume can be due to evaporation (physical change), boiling water releasing steam is a phase - change (physical), and a change in the shape of a solid is a physical deformation.

Answer:

the formation of a precipitate