Classify the 4 reactions that your group analyzed today as being either exotherm
ID: 1065104 • Letter: C
Question
Classify the 4 reactions that your group analyzed today as being either exothermic or endothermic. If you dissolve 10.0 g of compound X in 100.0 mL of distilled water, the liquid turns red. The temperature of the liquid stays at 24 degree C for 10 minutes. Why would you not want to sell a cold pack made with compound X? Consider a beaker of water that has an initial temperature of 25 degree C. When an ionic salt is dissolved in the water, the temperature changes to 5 degree C. If you were to touch the beaker, what would you feel? Is this reaction endothermic or exothermic? Is the energy of the products higher or lower than the energy of the reactants? Two competing corporations are submitting data to the US Military to create chemical hot packs. The Military has stipulated that the each hotpack may cost no more than 85 cents and must result in at least a 20 degree C rise in temperature when activated. Which of the following companies is the Military going to hire?Explanation / Answer
2) When 10 g of compound X was dissolved in 100 ml of distilled water, the temperature of the solution remained at 24 oC. The compound X cannot be used to make cold pack because in cold pack the solution temperature should drop below room temperature that is lower then 24 oC. Cold pack cools the area where it is applied instantly.
3) If an ionic compound is dissolved in a beaker with water at 25 oC, the temperature dropped to 5 oC,
a. The beaker would feel cold If touched.
b. The reaction is endothermic in nature.
c. The energy of products is higher than the energy of the reactants.
4) Of the two companies,
company B fits the needed requirement of of using least amount at lowest cost material with a net change in temperature of greater than 20 oC.