Question

1. when dissolving a solid in water, the test tube feels warm. is the reaction exothermic or endothermic? explain.

Explanation:

When a solid dissolves in water and the test tube feels warm, heat is released. Exothermic reactions release heat to the surroundings, while endothermic reactions absorb heat. Since heat is given off (test tube warms), it's an exothermic reaction.

Answer:

The reaction is exothermic.