Question

1. Identify each of the following changes as endothermic, exothermic, or not possible to tell. The matter to keep in perspective is in italics in each case. Explain your decision in each case. a) When effervescent antacid tablets are dropped into water, the tablets slowly disappear and the water becomes fizzy. b) On a hot day, water vapor condenses out of the air and turns into liquid droplets on the outside of a cold glass of lemonade. c) The copper on the Statue of Liberty oxidizes and turns blue.

Answer 1

Answer:

When effervescent antacid tablets are dropped into water, the tablets slowly disappear and the water becomes fizzy- endothermic

On a hot day, water vapor condenses out of the air and turns into liquid droplets on the outside of a cold glass of lemonade- exothermic

The copper on the Statue of Liberty oxidizes and turns blue.- endothermic

Explanation:

An exothermic reaction is a reaction in which heat is given out to the surrounding. The temperature of the system increases when an exothermic reaction occurs. An endothermic reaction occurs when heat is absorbed and the temperature of the system decreases. Oxidation of elements and effervescence of antacid solution are endothermic processes.

Given that the water vapour in air losses energy upon condensation to liquid, the process is exothermic