A student weighs out 80.3 g of an unknown metal and heats it to 99.7 C. He then
ID: 1033104 • Letter: A
Question
A student weighs out 80.3 g of an unknown metal and heats it to 99.7 C. He then pours it into a calorimeter filled with 52.3 gorwaterarz3Btc. The final temperature in the calorimeter reaches 332"C The specific heat of water is4184 1/g·? whatsthe specific heat ofthe metal? 1. a.Calculate the temperature change of the water (AT-Tot-Tti b. Calculate the heat absorbed by the water (Qster ms-AT) c. Calculate the heat released by the metal (Qene wt d. Calculate the temperature change of the metal (AT-T e.Calculatethespecificheat ofthe metal-sq-man/alos--/O.37 J?? 2/Os 2. a. In the example above,tell which substance (metal or water is losing heat and which is gaining heat. b. Is the heat change for the metal endothermic or exothermic? c. Is the heat change for the water endothermic or exothermic? Page 1 of 1Explanation / Answer
The initial temperature of metal is 99.7oC and the final equilibrium temperature is 33.2oC. Hence the tmeperature upon reation decreases in case of the metal, hence, the metal loses heat.
A substance that loses heat in a reaction is said to be endothermic.
Hence the metal is endothermic.
The initial temperature of water is 23.8oC and the final equilibrium temperature is 33.2oC . Final temperature is more than the initial temperature , hence water gains heat in the process.
A substance gaining heat in the reaction is called an exothermic reaction.
Water is undergoing exothermic enthalpy change.
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