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Balancing Chemical Reactions Worksheet - Chemistry | Free Math Practice

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Balancing Chemical Reactions

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Lesson 1

Balancing Chemical Reactions

In this lesson, we will learn how to balance chemical reactions, ensuring that the law of conservation of mass is obeyed. A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Steps to Balance a Chemical Equation

Write the unbalanced equation.
Count the number of atoms of each element on both sides.
Use coefficients to balance the atoms one element at a time, adjusting as necessary.
Check your work to ensure that all elements are balanced.

Example: Balancing the Reaction of Hydrogen and Oxygen to Form Water

Unbalanced equation: $H_{2} + O_{2} \rightarrow H_{2}O$

The equation is now balanced!

Key Questions

What is the law of conservation of mass?
Why is it important to balance chemical equations?
How do coefficients differ from subscripts in a chemical equation?

Keywords

Balancing
Coefficients
Conservation of mass
Reactants
Products

Keywords: Balancing, Coefficients, Conservation of mass, Reactants, Products

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2

O

Count atoms:

Left: $2 H, \ 2 O$
Right: $2 H, \ 1 O$

Balance O by adding a coefficient of 2 in front of $H_{2}O$ : $H_{2} + O_{2} \rightarrow 2H_{2}O$

Count atoms again:

Left: $2 H, \ 2 O$
Right: $4 H, \ 2 O$

Balance H by adding a coefficient of 2 in front of $H_{2}$ : $2H_{2} + O_{2} \rightarrow 2H_{2}O$

Final check:

Left: $4 H, \ 2 O$
Right: $4 H, \ 2 O$