Worksheet: Balancing Equations
I. Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3


2. C3H8 + O2 CO2 + H2O


3. P4 + O2 P2O3




4. KNO3 KNO2 + O2


5. O2 + CS2 CO2 + SO2


6. KClO3 KCl + O2


7. N2 + H2 NH3


8. NaF + Br2 NaBr + F2


9. Al + HCl H +AlCl3


10. WO3 + H2 W + H2O

Answer:

1. Chemical Equation 2. Reactants 3. Products 4. Coefficients 5. Balance 6. Conservation 7. Equal 8. Created 9. Destroyed 10. Coefficients 11. Subscripts

Explanation:

A balanced equation obeys the law of conservation of mass. The mass of the reactants and products are equal on both sides of the equation.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called the coefficients.

The coefficients are the numbers which are added in front of the formulas. According to law of conservation of mass, the mass can neither be created nor be destroyed. It can be transformed from one form to another.

In other words, the mass and charge are balanced on both sides of the reaction.

The balanced equation for the reaction is:

4Al (s) + 3O₂ (g) → 2Al₂O₃ (s)

Here the number of 'Al' and 'O' atoms are balanced.

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1
Nutrients are absorbed by blood in tiny blood vessels.
2
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3
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image

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