In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?
What water has hydrated the H2SO4, the reaction is exothermic so heat is evolved.
The observation you described, where the mixture becomes hot, suggests that an exothermic reaction has occurred. An exothermic reaction is a chemical reaction that releases heat into the surroundings. In this case, the combination of concentrated sulfuric acid with water resulted in the release of energy in the form of heat.
If you encounter similar questions in the future and want to determine the type of reaction, it is helpful to recall the various types of reactions and their characteristics. Understanding the principles of chemistry can assist you in making these determinations.