In Keesha's experiment with boiling water, which container was likely the hottest if they were made of different materials?

The container that was likely the hottest would be the one that is made of a material with high thermal conductivity. In boiling water experiments, the material's ability to transfer heat is key to determining how hot the container will get.

Certain materials, such as metals, have high thermal conductivity, which means they can absorb heat quickly and effectively. When placed in boiling water, these materials will reach higher temperatures than those with lower thermal conductivity, like plastics or ceramics.

If container Z is made of such a high-conductivity material, it would absorb the heat from the boiling water more efficiently than the other containers. Consequently, container Z would likely be the hottest by the end of the experiment, thereby making it the correct answer.