+ Predicted sign on each property listed below. Process or Reaction ΔΗ AS AG at high T AG at low T 20(g) – O2(g) Dissolving CaCl2(s) in water and solution feels warm. Melting ice cubes. CH.(g) + 202(g)→ CO2(g) + 2H2O(I1) Dissolving NH,N03(s) in water and solution feels cold.

+ Predicted sign on each property listed below. Process or Reaction ΔΗ AS AG at high T AG at low T 20(g) – O2(g) Dissolving CaCl2(s) in water and solution feels warm. Melting ice cubes. CH.(g) + 202(g)→ CO2(g) + 2H2O(I1) Dissolving NH,N03(s) in water and solution feels cold.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter8: Thermochemistry

Section: Chapter Questions

Problem 10QAP: How many mL of water at 10C (2 significant figures) must be added to 75 mL of water at 35C to obtain...

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

+
Predicted sign on each property listed below.
Process or Reaction
ΔΗ
AS
AG at high T AG at low T
20(g) – O2(g)
Dissolving CaCl2(s) in water and
solution feels warm.
Melting ice cubes.
CH.(g) + 202(g)→ CO2(g) + 2H2O(I1)
Dissolving NH,N03(s) in water and
solution feels cold.

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