Question

1. While performing a calorimetry experiment you mix 2 chemical solutions together and the initial temperature of the reagents before the reaction was 22.04°C and final temperature after the reaction was 25.11°C. Circle the correct answers below. a. Is the chemical reaction exothermic or endothermic? Exothermic Endothermic b. Is qsoln positive or negative? Positive Negative c. Is AHxn positive or negative? Positive Negative d. You realize that AT needs to be in Kelvin not Celsius. What should you do? Retake measurements in K Use the AT you obtained Convert AT into K from °C 2. A student is trying to determine the molar enthalpy change for a neutralization reaction and obtained the following temperature data: initial temperature of acid = 21.48°C, initial temperature of base = 21.53°C; final temperature = 18.21°C. Is their data correct? In one sentence explain why or why not.

Answer 1

1. While performing a calorimetry experiment you mix 2 chemical solutions together and the initial temperature of the reagents before the reaction was 22.04°C and final temperature after the reaction was 25.11°C. Circle the correct answers below. a. Is the chemical reaction exothermic or endothermic? Heat is released in the Exothermic Endothermic b. Is soln positive or negative? positive Negative c. Is AHixn positive or negative? Heat releses in the reaction Positive Negative d. You realize that AT needs to be in Kelvin not Celsius. What should you do? Retake measurements in K Use the AT you obtained Convert AT into K from °C Initial temperature T = 273+22.04 Delta t= 3.07 °C Delta in K = 273+3.07 = = 295.04 K and final temperature 276.07 K is T =273+25.11 = 298.11 K 2. A student is trying to determine the molar enthalpy change for a neutralization reaction and obtained the following temperature data: initial temperature of acid = 21.48°C, initial temperature of base = 21.53°C; final temperature = 18.21°C. Is their data correct? In one sentence explain why or why not. The given data is incorrect becuase during neutralisation reaction, always heat releases. Therefore, temperature increases