Question
heat of solution
Name Instructor/Section PRE-LAB or POST-LAB QUIZ Multiple choice questions. Circle your answers. The amount of heat absorbed by the calorimeter contents is a. the DIFFERENCE between the heat absorbed by the water and heat lost by the 1· chemical being dissolved. b. the SUM of the heat absorbed or lost by the water and heat absorbed or lost by the chemical being dissolved. c. assumed to be EQUAL to the heat absorbed by the water only. d. assumed to be EQUAL to the heat lost by the water only The amount of heat absorbed by the calorimeter and contents is a. equal in value-but opposite in sign-to the heat lost by the chemical being dis- 2. solved. b. equal-in value and in sign-to the heat lost by the chemical being dissolved. c. always more than is lost by the chemical being dissolved. d. sometimes more and sometimes less than the heat lost-only by experiment do we know 3. If the heat of solution for a chemical was -22,000 cal/g when 2.0 g of solid was dis- solved, the value for the heat of solution using 4.0 g should be a. -44,000 cal/g b.-22,000 cal/g c. -11,000 cal/g
Explanation / Answer
Q.1: The amount of heat absorbed by the calorimeter content is the difference between the heat absorbed by water and the heat lost by the chemicals being used. Hence 1st option is correct.
Q.2: The amount of heat absorbed by the calorimeter and content is equal in value, but opposite in sign to the heat lost by the chemical being dissolved. Hence option (a) is correct.
Q.3: Whether we take 2.0 g or 4.0 g, the heat of solution remains the same. Hence the value of heat of solution using 4.0 g is also - 22,000 cal/g. Hence option (b) is correct.
