2.A student is performing Part C and does not completely dissolve the NaOH pellets before acquiring the final temperature. How will this affect his value for ΔHRand his percent error calculations? (5 points) 3.In a different experiment it is observed that 252 J of heat must be absorbed to raise the temperature of 50.0 g of Ni(s) from 20.0 to 31.4 . Calculate the specific heat of Ni in both J/g·and cal/g·. (5 points) ℃ ℃ 4.For the three reactions studied in this experiment, demonstrate how the third reaction is the sum of the first two reactions. Which species “cancel out”? (5 points) 13
CHEM 212 Lab 9: CALORIMETRY AND HESS’S LAW Name:_________________________ Dry Lab Lab Session: _____________________ When the first substance dissolves, it releases heat, which then causes neutralization to occur. Heat of reaction cancels out. Quiz Questions 1.What is the most important requirement of a calorimeter? (3points) 2.Do you classify the reactions in this experiment as exothermic or endothermic? Why?(4 points) 3.In the hands-on experiment, students are instructed to pour all the waste solutions into the sink. Explain why this is a safe disposal procedure for this lab. (4 points) 14
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- Winter '20
- Enthalpy, ΔHN