5 3 Lecture

5.3 Balancing Chemical Equations Pages 161 - 165

Goal 1 Describe and balance chemical equations

[object Object],Methane + Oxygen  Carbon dioxide + Water Reactants Products

[object Object],[object Object],[object Object],Important !!

[object Object],[object Object],CH 4 + 2 O 2  CO 2 + 2 H 2 O

[object Object],[object Object],[object Object],[object Object],CH 4 + 2 O 2  CO 2 + 2 H 2 O

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CH 4 + 2 O 2  CO 2 + 2 H 2 O # of atoms on left MUST = # of atoms on right Is this equation balanced?

CH 4 + 2 O 2  CO 2 + 2 H 2 O Yes! It’s balanced

[object Object],[object Object],[object Object],[object Object],H 2 + O 2  H 2 O # of atoms on left MUST = # of atoms on right Is this equation balanced?

[object Object],[object Object],[object Object],[object Object],H 2 + O 2  H 2 O # of atoms on left MUST = # of atoms on right How can we balance it?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],__ H 2 + __ O 2  __ H 2 O # of atoms on left MUST = # of atoms on right Try it…

[object Object],[object Object],[object Object],[object Object],_ 2 _ H 2 + __ O 2  _ 2 _ H 2 O # of atoms on left MUST = # of atoms on right Try it…

[object Object],[object Object],[object Object],[object Object],__ Mg + __ O 2  __ MgO # of atoms on left MUST = # of atoms on right Let’s try it again…

[object Object],[object Object],[object Object],[object Object],_2_ Mg + __ O 2  _2_ MgO # of atoms on left MUST = # of atoms on right How did you do?

[object Object],[object Object],[object Object],[object Object],__ CH 4  __ C 3 H 8 + __ H 2 # of atoms on left MUST = # of atoms on right Let’s try it one more time…

[object Object],[object Object],[object Object],[object Object],_ 3 _ CH 4  __ C 3 H 8 + _ 2 _ H 2 # of atoms on left MUST = # of atoms on right How did you do?

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