Presentation on theme: "Science Balancing Equations. WATER is made from OXYGEN and HYDROGEN Hydrogen + Oxygen Water."— Presentation transcript:
Science Balancing Equations
WATER is made from OXYGEN and HYDROGEN Hydrogen + Oxygen Water
That’s two hydrogen atoms and one oxygen atom to make one molecule of water.
The problem is ….. Hydrogen goes around in twos, as H 2 Hydrogen goes around in twos, as H 2 Oxygen also goes around in twos, as O 2 Oxygen also goes around in twos, as O 2
So when Water is made … There’s an oxygen atom left over There’s an oxygen atom left over …. And that doesn’t happen!
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 hydrogen 2 …. 2H 2 O 2H 2 + O 2 But still only one oxygen 2 molecule ….. 2H 2 O means 2 molecules of H2O (water) are made
So two H 2 molecules bond with only one O 2 molecule … 2H 2 O 2H 2 + O 2
Which looks like this …. 2H 2 + O 2 2H 2 O
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.