1 The temperature of water in a beaker is 25°CAfter adding a piece of magnesium to the water, the temperature increases to 28°CIs this an exothermic or endothermic reaction? Explain your answer.2 Solid crystals of iodine were placed in a flaskThe top of the flask was covered with aluminum foilThe flask was gently heatedSoon, the flask was filled with a reddish gasWhat change of state took place?Explain your answer.3 Would using dry ice in your holiday punch cause it to become watery after several hours? Why or why not?
1) exothermic, since you gave off heat to the environment by raising it from 25 degrees to 28 degrees 2) change of state from solid to gas state which is called sublimation3) No, since dry ice goes from solid to gas state (skipping the liquid phase) it would not make your holiday punch watery.
