Multiple Choice
Which of the following is NOT provided by the coefficients in a balanced chemical equation?
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3. Chemical Reactions
Balancing Chemical Equations
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Which of the following chemical equations is balanced correctly?
A
2 H_2 + 2 O_2 ightarrow 2 H_2O
B
H_2 + O_2 ightarrow H_2O
C
H_2 + 2 O_2 ightarrow 2 H_2O
D
2 H_2 + O_2 ightarrow 2 H_2O
Verified step by step guidance1
Identify the number of atoms of each element on both sides of the chemical equation to check if they are equal, which is the definition of a balanced equation.
For the equation \$2\ H_2 + 2\ O_2 \rightarrow 2\ H_2O$, count the atoms: Reactants have 4 H and 4 O atoms; products have 4 H and 2 O atoms, so it is not balanced.
For the equation \(H_2 + O_2 \rightarrow H_2O\), count the atoms: Reactants have 2 H and 2 O atoms; products have 2 H and 1 O atom, so it is not balanced.
For the equation \(H_2 + 2\ O_2 \rightarrow 2\ H_2O\), count the atoms: Reactants have 2 H and 4 O atoms; products have 4 H and 2 O atoms, so it is not balanced.
For the equation \$2\ H_2 + O_2 \rightarrow 2\ H_2O$, count the atoms: Reactants have 4 H and 2 O atoms; products have 4 H and 2 O atoms, so the equation is balanced.
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