Is Gasoline Being Evaporated A Chemical Change
five.1: Chemical Changes and Chemical Reactions
- Folio ID
- 79556
In Chapter 2, we classified changes in our environment utilizing the concepts of physical and chemical changes. Nosotros said that a physical modify alters the advent of a substance without changing its molecular structure. Ice melts, water evaporates and mountains are slowly weathered into dust. All of these change the characteristics of substances, but they exercise not alter its bones structure. A chemical change, however, results in the transformation of ane molecular substance into another. Gasoline burns, reacting with oxygen in the atmosphere, generating light, oestrus, and converting the carbon-based molecules into carbon dioxide gas and h2o vapor. When substances combine like this and undergo chemical changes, we say that a chemic reaction has occurred. Some chemical reactions are quite evident, like the burning of gasoline, and involve the production of estrus or calorie-free. In other types of chemic reactions, gases are evolved, color changes occur and clear solutions become cloudy, with the ultimate formation of an insoluble substance (a precipitate). Chemical changes can likewise be quite obscure and their occurrence can merely be detected by sophisticated chemical assay.
Sometimes chemical changes occur spontaneously, others require the input of energy (rut) in order to occur. Chemical reactions can occur apace, similar the explosive reaction of sodium metal in the presence of water, and others occur very slowly, like the rusting of iron or the tarnish that slowly develops on some metallic surfaces exposed to air. In this chapter nosotros will acquire to stand for chemical reactions using chemical equations. We will learn to balance these equations, explore types of reactions and learn to predict products from simple reactions. Central to all of this is the concept of the chemical equation.
Contributors and Attributions
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Paul R. Young, Professor of Chemistry, Academy of Illinois at Chicago, Wiki: AskTheNerd; PRY
askthenerd.com - pyounguic.edu; ChemistryOnline.com
Source: https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_Introductory_Chemistry_Online_(Young)/05%3A_Chemical_Reactions/5.1%3A_Chemical_Changes_and_Chemical_Reactions
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