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Science

Learn about the process of balancing equations to create water, which is made from oxygen and hydrogen. Understand why extra molecules of reactants must be added to ensure no leftover single oxygen atoms.

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Science

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  1. Science Balancing Equations

  2. WATER is made from OXYGEN and HYDROGEN Hydrogen + Oxygen Water

  3. That’s two hydrogen atoms and one oxygen atom to make one molecule of water. H H O

  4. The problem is ….. • Hydrogen goes around in twos, as H2 • Oxygen also goes around in twos, as O2 H H O O

  5. O So when Water is made … • There’s an oxygen atom left over H H O …. And that doesn’t happen!

  6. So we do some balancing … We makes sure we use enough hydrogen so we don’t have any leftover single oxygen atoms. Let’s try two of hydrogen2…. But still only one oxygen2 molecule ….. 2H2 + O2  2H2O 2H2O means 2 molecules of H2O (water) are made

  7. H H O O H H So twoH2 molecules bond with only one O2 molecule …  2H2O 2H2 + O2

  8. H H O O H H Which looks like this…. 2H2 + O2 2H2O

  9. That’s why we add extra molecules of reactants. But we must always make sure that these extra amounts are also added to the product of the equation.

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