POGIL: Intermolecular Forces Model 1: What is an intermolecular force? As you have learned, matter is made up of discrete particles called atoms, which chemically combine to form molecules. Molecules do not exist as independent units: in fact, groups of molecules "stick together" in order to form liquids and solids. The forces that hold groups of molecules together are intermolecular forces. Without intermolecular forces, the world as we know it would not be the same. Figure 1: Intramolecular and Intermolecular Forces MOLECULE * intramolecular force --- intermolecular force Critical Thinking Questions: 1. What specific molecule is represented inside each box in Figure 1? 2. In relation to the box for molecule 1, where do the intramolecular forces exist in Figure 1- inside the boxes or outside the boxes? 3. Based on the intramolecular forces for molecule 1, draw similar asterisks (*) for the intramolecular forces on the diagram for molecules 2 and 3. 4. In relation to the molecule, where do intramolecular forces tend to occur - within the molecule or outside of the molecule? 5. Two intermolecular forces exist in Figure 1. Where are they positioned relative to the molecules - within the molecules or between the molecules? 6. State the difference between intermolecular and intramolecular forces in terms of where they occur on the molecular level. age 1 of 7 MOLECULE 2
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.
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