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Understanding Chemical Reactions: Balancing Equations and Atom Counting

Learn about chemical reactions, balancing equations, and counting atoms to ensure reactants and products are balanced and equal in math equations. Discover how to balance chemical equations step by step with examples.

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Understanding Chemical Reactions: Balancing Equations and Atom Counting

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Presentation Transcript

  1. Chemical Reactions

  2. Chemical Reactions • Chemical reactions are math equations. • There are two parts to the equation • Reactants • The substances that you start with • Products • The substances that you end with

  3. Circle the reactants!Underline the products • 8 + 7 = 15 • Na + Cl = NaCl • 4H + O2 = 2 H2O • 6CO2 + 6H2O + Light = C6H12O6 + 6O2

  4. How to add up atoms • The first number is a multiplier of how many molecules we have. • Subscript tells us how many atoms of that element we have in each molecule • So lets try a few

  5. How many atoms do we have of each element on one side of the equation? Na + Cl = NaCl • 1 atom of Na, 1 atom of Cl • 4H + O2 = 2 H2O • 4 atoms of hydrogen, 2 atoms of Oxygen • 6CO2 + 6H2O + Light = C6H12O6 + 6O2 • 6 atoms of Carbon, 12 atoms of Hydrogen, 12 Atoms of Oxygen

  6. Balanced Equation • Atoms can’t be created or destroyed • All the atoms we start with we must end up with • A balanced equation has the same number of each element on both sides of the equation.

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