Dialogue of teachers and students In the classroom Teacher: Morning all? All students: Morning teacher. Teacher: Today we will learn about acid and bases. Does anyone know what is acid and what is a base? Sonya: me miss , acid is a substance (compound) that causes sour taste in various materials. While the base is a compound that generally has a bitter taste. Teacher: Yes, that's right Ranti . The theory of acid and base that we will learn there are three, the theory according to Arrhenius, Bronsted-Lowry, and Lewis. According to the theory of Arrhenius acid is a substance which if in the water releases hydrogen ions (H +), whereas a base is a compound which in water can produce OH hid hydroxide ions. Radika: Miss, I want to ask how the solution if acidic / basic compounds can produce H + / OH- ions that are not soluble in water. Teacher: good question . Not all compounds dissolve in water so acid-b...
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CAUSE AND EFFECT Chemical reactions are said to or take place if one of the following things should be observed: they produce gas, sediment, temperature change and color change. Chemical reactions are a process whereby new substances, the reaction product, are formed from some of the original substances, called reactants. Usually a chemical reaction is accompanied by physical events, such as discoloration, sediment formation, or gas generation. Symbols expressing a chemical reaction are called chemical equations. The characteristics of a chemical reaction are: 1. Color Changes occur In chemical reactions, the reactants are converted into products. Changes that occur can be caused by the breaking of bonds antaratom reactants and the formation of bonds that bru make the product. To break the bond needed energy. To form a new bond, it releases some energy. Thus, in chemical reactions there is a change of energy. The chemical reaction that produces energy ...