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physical reversible change eg crossing your arms to form an X and one action that can represent a chemical irreversible change eg rolling your arms over one another in air then reverse th. For either sex deer date s see p 30 31 in the Hunting Seasons Regulations publication or online Click here Twelve 12 per season Statewide No more than en 10 may be antlerless and no more than two may be antlered One of the antlered deer must hav Most common reactions for aromatics involve replacement of ring . hydrogens. by other atoms or groups . (substitution reactions). Mechanism of Electrophilic Aromatic Substitution Reactions. Electrophile. DEFINITIONS AND TYPES. Revision:. DO NOT WRITE- FOR YOUR INFO ONLY. We have looked at the period table, what atoms are, elements and compounds. You have learnt that atoms can join to make compounds or molecules and that we can mix compounds to make new compounds…..these are chemical reactions. ‘Encountering the play’. “It is so easy to lose the freshness of direct response to ‘first time’ encounter with a text, which will in time be overlaid by the experience of working, scene by scene, through the text. Most people who have seen this play throughout its life have probably only seen it once: . If a set of chemical reactions is taking place in a system, a . complete. mathematically independent sub-set is one where every reaction that is . not. included in the complete mathematically independent sub-set can be written as a linear combination of the reactions that . Chemical Equations. This equation means:. 4 Al(. s. ) + 3 O. 2. (. g. ) 2 Al. 2. O. 3. (. s. ). 4 Al atoms + 3 O. 2. molecules yield 2 molecules of Al. 2. O. 3. 4 Al . moles. In general, we look at what occurs and try to learn how it happens. Common patterns describe the changes. Addition reactions – two molecules . combine. Elimination reactions – one molecule splits into two. Part . 1: Decomposition and Synthesis Reactions. . Objectives. -To identify decomposition and synthesis chemical reactions. -To predict the products of these two types of reactions. 2. Symbols in . . Ch. 8 – Chemical Reactions. Signs of a Chemical Reaction. Evolution of heat and light. Formation of a gas. Formation of a precipitate. Color change. Law of Conservation of Mass. mass is neither created nor destroyed in a chemical reaction. Alkenes. The commercial . process. of . hydrogenation is . used. to . convert the double . bonds. in . vegetable oils to . saturated. fats . such as those in margarine. . Learning . Goal . . Draw the condensed or line-angle structural formulas and give the names for the organic products of addition reactions of alkenes. Draw a condensed structural formula for a section of a polymer.. 北京大学物理学院. . 技术物理系 . • . 裴俊琛. . Junchen. Pei, School of Physics, Peking University . 2016.9, Beijing. Prepared based on many others slides. Introduction. The . risk for development of a drug eruption is related to the following factors: age, gender, dose, and the nature of the medication itself. . Females . are . 1.3-1.5 . times more likely to develop drug eruptions, except in children under the age of 3 where boys are more likely to be affected. . Objective. To know about . electrophilic. substitution reactions. Success criteria. Understand . the mechanism of the . electrophilic. substitution reactions of . benzene. Understand this for . halogenation. Write your answer in your. . science journal.. Quiz. 1. How . many molecules of oxygen gas in the reactant (O. 2. ) are needed to balance this equation?. CH. 4. + O. 2. → 2CO. 2. + 4H. 2. O.