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Chemical reactions

Chemical reactions. Chapter 9 section 1. Main Idea: Chemical reaction are represented by balanced chemical equations. Create your foldable from page 281. Chemical Reaction is the process by which atoms of one or more substances are rearranged to form different substances.

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Chemical reactions

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  1. Chemical reactions Chapter 9 section 1

  2. Main Idea:Chemical reaction are represented by balanced chemical equations. Create your foldable from page 281

  3. Chemical Reaction is the process by which atoms of one or more substances are rearranged to form different substances. • Evidence of a chemical reaction • many provide physical evidence: • a temperature change • release of energy in light or heat • absorption of heat (gets colder) • color change • odor or gas being released

  4. Representing chemical reactions • Reactants • The starting material • Written on the LEFT side of the equation • Products • The substances formed during the reaction • Written on the RIGHT side of the equation. Reactant1 + Reactant 2  Product1 +Product2 In groups walk up to the demo table and make your observations of these reactants. Be specific in your descriptions.

  5. Types of Equations: • Skeleton Equations- uses chemical formulas rather than words to identify the reactants and the products. • Al(s) + Br2 (l)  AlBr3 (s) • Note * this IS NOT a BALANCED equation. practice p. 284 • Word equations – use the names of elements and the phase • Reactant1 + reactant2  Product 1 • aluminum (s) + bromine (l)  aluminum bromide (s) • Chemical equations- MUST show that matter is conserved during a reaction. These ARE BALANCED equations. • A Balanced equation has the same number of atoms of each element on BOTH sides of the arrow (yield sign) • Use Coefficients infront of the parts of the skeleton equation to multiply and balance the equation. • Al(s) + Br2 (l)  AlBr3 (s) Becomes 2Al (s) + 3Br2 (g)  2AlBr3 (s) • Practice problems p. 287

  6. Copy down the chart on page 288, This might be used on the quiz. Homework: Packet 1page 1: chapter 9 voc.page 2: describe the process for baking your favorite snack in terms of a word equation and a skeleton equation. *EC for a semi-correct balanced equation.*page 3: 9.1 study guide wkst

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