By Kenneth W. Whitten, Raymond E. Davis, Larry Peck, George G. Stanley
The Qualitative research chapters at the moment are to be had in a convenient paperback complement, ideal for bundling with the middle textual content, CHEMISTRY, 8th version, or to be used as a standalone merchandise.
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A few soluble salts are molecular (and not ionic) compounds. 4. Red and blue are used in oxidation–reduction reactions and electrochemistry. a. Oxidation numbers are shown in red circles to avoid confusion with ionic charges. Oxidation is indicated by blue and reduction is indicated by red. ؉1 ؉5 ؊2 0 ؉2 ؉5 ؊2 0 888n 8n 88 8888 888 2[Agϩ(aq) ϩ NO3Ϫ(aq)] ϩ Cu(s) 88n [Cu2ϩ(aq) ϩ 2NO3Ϫ(aq)] ϩ 2Ag(s) ϩ2 888888888888 Ϫ1 88 888888888888888888888888888888888888888888888888888888 The nitrate ions, NO3Ϫ, are spectator ions.
We call such processes exothermic. Any combustion (burning) reaction is exothermic. Some chemical reactions and physical changes, however, are endothermic; that is, they absorb energy from their surroundings. An example of a physical change that is endothermic is the melting of ice. The Law of Conservation of Matter When we burn a sample of metallic magnesium in oxygen, the magnesium combines with the oxygen (Figure 1-1) to form magnesium oxide, a white powder. This chemical reaction is accompanied by the release of large amounts of heat energy and light energy.
The mass of magnesium oxide formed is equal to the sum of the masses of oxygen and magnesium that formed it. This statement is an example of a scientiﬁc (natural) law, a general statement based on the observed behavior of matter to which no exceptions are known. A nuclear reaction is not a chemical reaction. The Law of Conservation of Energy In exothermic chemical reactions, chemical energy is usually converted into heat energy. Some exothermic processes involve other kinds of energy changes. For example, some liberate light energy without heat, and others produce electrical energy without heat or light.
Chemistry (with CengageNOW Printed Access Card) by Kenneth W. Whitten, Raymond E. Davis, Larry Peck, George G. Stanley