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Introduction: The equation H? + O? -> H?O is unbalanced because there are two oxygen atoms on the reactants side of the equation, and only one on the products side of the equation. To balance the equation, you cannot change the structure of any of the molecules, but you can change the number of molecules that are used. Question: How are chemical equations balanced? 1. Balance: Turn on Show histograms. The equation is balanced when there are equal numbers of each type of atom represented on each side of the equation. In the Gizmo, use the up and down arrows to adjust the numbers of hydrogen, oxygen, water molecules until the equation is balanced. When you are done, turn on Show summary to check your answer. Write the balanced equation here: H? + O? -> H?O 2. Solve: Turn off Show summary. Use the Choose reaction drop down menu to see equations, and balance them. Check your answers and then write the balanced equa 2 Al + 6 HCl -> 2 AlCl? + 3 H? NaCl -> Na + Cl? Na?S + HCl -> NaCl + H?S CH? + O? -> CO? + H?O Practice: Balance the following chemical equations. (These equations are not in t A. Na + Cl? -> NaCl B. Na + H?O -> NaOH + H? C. Mg + O? -> MgO D. KClO? -> KCl + O? E. Al + CuO -> Al?O? + Cu F. I? + Na?S?O? -> NaI + Na?S?O? G. Mg + P? -> Mg?P?

          Introduction: The equation H? + O? -> H?O is unbalanced because there are two oxygen atoms
on the reactants side of the equation, and only one on the products side of the equation. To
balance the equation, you cannot change the structure of any of the molecules, but you can
change the number of molecules that are used.
Question: How are chemical equations balanced?
1. Balance: Turn on Show histograms. The equation is balanced when there are equal
numbers of each type of atom represented on each side of the equation.
In the Gizmo, use the up and down arrows to adjust the numbers of hydrogen, oxygen,
water molecules until the equation is balanced. When you are done, turn on Show
summary to check your answer.
Write the balanced equation here: ____ H? + ____ O? -> ____ H?O
2. Solve: Turn off Show summary. Use the Choose reaction drop down menu to see
equations, and balance them. Check your answers and then write the balanced equa
2 Al + 6 HCl -> 2 AlCl? + 3 H?
____ NaCl -> ____ Na + ____ Cl?
____ Na?S + ____ HCl -> ____ NaCl + ____ H?S
____ CH? + ____ O? -> ____ CO? + ____ H?O
Practice: Balance the following chemical equations. (These equations are not in t
A. ____ Na + ____ Cl? -> ____ NaCl
B. ____ Na + ____ H?O -> ____ NaOH + ____ H?
C. ____ Mg + ____ O? -> ____ MgO
D. ____ KClO? -> ____ KCl + ____ O?
E. ____ Al + ____ CuO -> ____ Al?O? + ____ Cu
F. ____ I? + ____ Na?S?O? -> ____ NaI + ____ Na?S?O?
G. ____ Mg + ____ P? -> ____ Mg?P?

Introduction: The equation H? + O? -> H?O is unbalanced because there are two oxygen atoms
on the reactants side of the equation, and only one on the products side of the equation. To
balance the equation, you cannot change the structure of any of the molecules, but you can
change the number of molecules that are used.
Question: How are chemical equations balanced?
1. Balance: Turn on Show histograms. The equation is balanced when there are equal
numbers of each type of atom represented on each side of the equation.
In the Gizmo, use the up and down arrows to adjust the numbers of hydrogen, oxygen,
water molecules until the equation is balanced. When you are done, turn on Show
summary to check your answer.
Write the balanced equation here: H? + O? -> H?O
2. Solve: Turn off Show summary. Use the Choose reaction drop down menu to see
equations, and balance them. Check your answers and then write the balanced equa
2 Al + 6 HCl -> 2 AlCl? + 3 H?
NaCl -> Na + Cl?
Na?S + HCl -> NaCl + H?S
CH? + O? -> CO? + H?O
Practice: Balance the following chemical equations. (These equations are not in t
A. Na + Cl? -> NaCl
B. Na + H?O -> NaOH + H?
C. Mg + O? -> MgO
D. KClO? -> KCl + O?
E. Al + CuO -> Al?O? + Cu
F. I? + Na?S?O? -> NaI + Na?S?O?
G. Mg + P? -> Mg?P?

Added by Mark R.

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