Is Energy Released Or Absorbed For An Exothermic Analysis
CH 110 Pre-Lab revised Spring 2015 HESS' LAW AND THE FIRST LAW OF THERMODYNAMICS
1. (a) IN YOUR OWN WORDS, explain how Hess’ Law (of constant heat summation) applies to the 3 chemical reactions that will be studied in this experiment
(b) Does the temperature decrease or increase for an exothermic reaction?
(c) Is energy released or absorbed for an exothermic reaction?
(d) What is the sign (positive or negative) for the ΔH of an exothermic reaction ? (e) Use the heat capacity of the calorimeter given in the manual (top p. 34) and the equation at the top of p. 36 to calculate the heat gained by the calorimeter if the ΔT for a reaction was 7.06 °C.
2. Describe the
1. (a) IN YOUR OWN WORDS, explain how Hess’ Law (of constant heat summation) applies to the 3 chemical reactions that will be studied in this experiment
(b) Does the temperature decrease or increase for an exothermic reaction?
(c) Is energy released or absorbed for an exothermic reaction?
(d) What is the sign (positive or negative) for the ΔH of an exothermic reaction ? (e) Use the heat capacity of the calorimeter given in the manual (top p. 34) and the equation at the top of p. 36 to calculate the heat gained by the calorimeter if the ΔT for a reaction was 7.06 °C.
2. Describe the