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Lecture14 - Chem 1P Lecture 14 Chemical reactions So far...

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Chem 1P Lecture 14: Chemical reactions
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So far… atoms and orbitals molecules and compounds mass calculations
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molecules interact Chang Section 3.7
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Chemical Reactions In a chemical reaction, the atoms in one or more substances are reorganized or recombined. This is different from a physical change in which a substance changes from one state of matter to another. Chang Section 3.7 combustion reaction photosynthesis apple turns brown
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Chemical Reactions Antoine Lavoisier (1743-1794) Chang Section 3.7
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reactants products Chemical Reactions + Combustion of methane + CH 4 (g) + O 2 (g) CO 2 (g) + H 2 O (g) Chang Section 3.7
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Chemical Reactions + + CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O (g) 1 C 1 C 4 H 4 H 4 O 2 O 2 O Balancing the equation + Chang Section 3.7
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Information in chemical equations CH 4 (g) + 2O 2 (g) CO 2 (g) + 2H 2 O (g) Chang Section 3.7
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Balancing a chemical equation 1. Determine what reaction is occurring. Write down the formulas and physical states for reactants and products 2. Write the unbalanced equation. 3. Balance the equation, starting with the most complicated molecule. Chang Section 3.7
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Balancing a chemical equation Solid ammonium dichromate can be ignited to form nitrogen gas, water vapor, and solid chromium (III) oxide. Write a balanced chemical equation for this reaction. 1. Determine what reaction is occurring. Write down the formulas and physical states for reactants and products Reactants: (NH 4 ) 2 Cr 2 O 7 (s) Products: N 2 (g), H 2 O (g), Cr 2 O 3 (s) Chang Section 3.7
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Balancing a chemical equation
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