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Which of the following chemical equations is balanced correctly?
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3. Chemical Reactions
Balancing Chemical Equations
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Consider the chemical equation: 2 H2 + O2 → 2 H2O. How many different elements are present in this chemical equation?
A
2
B
4
C
3
D
1
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Identify all the unique elements present in the chemical equation by examining each compound's chemical formula.
In the reactants, look at H2 and O2. H2 contains the element hydrogen (H), and O2 contains the element oxygen (O).
In the product, H2O contains hydrogen (H) and oxygen (O) as well.
List the distinct elements found: hydrogen (H) and oxygen (O).
Count the number of different elements listed to determine how many unique elements are present in the equation.
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