Question

9. During the calorimetry lab, we measured the exchange of heat. We assumed heat lost by the system would equal heat gained by the surroundings. During this lab, the system was an acid base neutralization reaction. Which of the following best describes the measured surroundings in our experiment? [5pts] a. Styrofoam cups b. The bench top c. Water in the acid/base solutions d. All of the above Both "a" and "b" f. Both "a" and "C" 10. During lab 7 you collected H2 gas over water in a graduated cylinder. During your calculations, you needed to account for the vapor pressure of H2O at your temperature. Which of the following statements best describes why you needed to account for H2O vapor pressure? (5pts] a. Some of the Ha gas will dissolve in the water and the amount Hz dissolved is dependent on the water temperature The H;O vapor take us space in the cylinder and will make the volume of Hz collected seem higher c. The H,O vapor changes the ideal gas constant R unless it is removed d. The PV = nRT formula will only work if one gas is present in the system and does not work for mixtures of gases

Answer 1

Augwer:- Surroundings interact with system directly. So ; Styroform cups (in which reaction is happening and water in the acid (base reaction is surrounding. It should be noted that bench tep is not surraqueling as it doesnat interact directly with system. o so answer - Bom a and c. 10 The Hel vapour takes us space in the cylinder and will make the volume of M2 collected seam higher.