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Chemical Reactions and Equations - Understanding and Balancing Reactions (89 characters)

Learn about chemical reactions and how to represent them with equations. Understand the evidence of chemical change and how to balance chemical equations. (223 characters)

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Chemical Reactions and Equations - Understanding and Balancing Reactions (89 characters)

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  1. Chemical Reactions Section 9.1Reactions and Equations Section 9.2Classifying Chemical Reactions Section 9.3Reactions in Aqueous Solutions Click a hyperlink or folder tab to view the corresponding slides. Exit Chapter Menu

  2. Section 9.1 Reactions and Equations • Recognizeevidence of chemical change. chemical change:a process involving one or more substances changing into a new substance • Representchemical reactions with equations. • Balancechemical equations. chemical reaction reactant product chemical equation coefficient Chemical reactions are represented by balanced chemical equations. Section 9-1

  3. Chemical Reactions • The process by which one or more substances are rearranged to form different substances is called a chemical reaction. Section 9-1

  4. Chemical Reactions (cont.) • Evidence of a chemical reaction • Change in temperature • Change in color • Odor, gas, or bubbles may form. Section 9-1

  5. Representing Chemical Reactions • Chemists use statements called equations to represent chemical reactions. • Reactantsare the starting substances. • Productsare the substances formed in the reaction. • This table summarizes the symbols used in chemical equations. Section 9-1

  6. Representing Chemical Reactions (cont.) • In word equations, aluminum(s) + bromine(l) → aluminum bromide(s) reads as “aluminum and bromine react to produce aluminum bromide”. Section 9-1

  7. Representing Chemical Reactions (cont.) • Skeleton equations use symbols and formulas to represent the reactants and products. Al(s) + Br(l) → AlBr3(s) • Skeleton equations lack information about how many atoms are involved in the reaction. Section 9-1

  8. Representing Chemical Reactions (cont.) • A chemical equationis a statement that uses chemical formulas to show the identities and relative amounts of the substances involved in a chemical reaction. Section 9-1

  9. Balancing Chemical Equations • This figure shows the balanced equation for the reaction between aluminum and bromine. Section 9-1

  10. Balancing Chemical Equations (cont.) • A coefficientin a chemical equation is the number written in front of a reactant or product, describing the lowest whole-number ratio of the amounts of all the reactants and products. Section 9-1

  11. Balancing Chemical Equations (cont.) Section 9-1

  12. Balancing Chemical Equations (cont.) Section 9-1

  13. Balancing Chemical Equations (cont.) Section 9-1

  14. Balancing Chemical Equations (cont.) • The most fundamental law in chemistry is the law of conservation of mass. • Balanced equations show this law. Section 9-1

  15. Balancing Chemical Equations (cont.) Section 9-1

  16. A B C D Section 9.1 Assessment Which of the following is NOT a chemical reaction? A.a piece of wood burning B.a car rusting C.an ice cube melting into water D.red litmus paper turning blue Section 9-1

  17. A B C D Section 9.1 Assessment What is the coefficient of bromine in the equation 2Al(s) + 3Br2(l) → 2AlBr3(s)? A.1 B.2 C.3 D.6 Section 9-1

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