CHEM 103 Lab Exam 4 Questions With Answers Latest 2023/2024 (Portage Learning)
What does it mean that the heat of a reaction is an extensive property? 2. (3 points) Does the following reaction give off heat or absorb heat? Explain briefly. C D H = +263Kcal/mol 3. (4 points) In one experiment in the video, room temperature water was mixed with water at about 38 degrees. To what temperature (about) did the mixture of the two water samples come to after setting for a few minutes? Answer: 1. The heat depends on the amount of substance. If the amount of substance is doubled, then the heat doubles. Other properties, such as density, are intensive, which means the amount of substance does not matter. 2. The (+) value indicates this reaction absorbs heat. 3. The mixture reached 30oC, but settled to 29.8oC. Question 2 Answer the following three questions: 1. (3 points) A student conducted an experiment where she mixed 75 g of tap water (25.0oC) with 75g of warm water(35.0oC). The final temperature of the mixture was 28.0o How much heat was gained by the tap water if the specific heat of water is 4.18 J/K-g? 2. (3 points) In one experiment in the video, HCl was mixed with another substance. What other substance was mixed with HCl? 3. (4 points) One student conducts an acid-base reaction where he finds the following results. What is the enthalpy of the reaction (in KJ/mol)?
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