rmal text BIUA Arial 17.2 + 2 . 3 .| 4 . in blue ink using complete sentences. 1. How is a physical change different from a chemical change? 2. How do you know a chemical reaction has happened? 3. Give an example of a chemical change. 4. How do you know this chemical reaction has taken place? 5. Name three different properties you can test before and after a chemical reaction to determine if a new substance was formed. 6. What does a catalyst do in a chemical reaction? 7. Are the number of atoms before and after a chemical reaction the same? Why? 8. What are two ways you can tell that the steel wool in the video underwent a chemical reaction? Support | Schoology Blog | PRIVACY POLI
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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