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3/20/12 - Bellringer

3/20/12 - Bellringer. Label the following as solid, gas, liquid, and aqueous at room temperature: Oxygen A solution Mercury Iron. 23.2 – Chemical Equations. Balance. Law of conservation of mass requires balance

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3/20/12 - Bellringer

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  1. 3/20/12 - Bellringer • Label the following as solid, gas, liquid, and aqueous at room temperature: • Oxygen • A solution • Mercury • Iron

  2. 23.2 – Chemical Equations

  3. Balance • Law of conservation of mass requires balance • In a balanced chemical reaction, both sides of equation have same number of atoms of each element • Choosing coefficients becomes easier with practice but requires trial and error at first

  4. Writing Balanced Chemical Equations • Describe the reaction in words • Write the equation using formulas and symbols • Check for balance • Add coefficients where needed for balance

  5. Example • Hydrogen gas (H2) and oxygen gas (O2) yield liquid water. • H2 (g) + O2 (g) => H2O (l) • Is balanced? • If not, start with element NOT equal on both sides • 2H2 (g) + O2 (g) => 2H2O (l)

  6. In-Class Assignment/Homework • Balancing Equations Challenge, Part C • 23.2 WKT • Tomorrow – More Balancing Practice

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