Multiple Choice
In the balanced chemical equation 2Al + 6HCl → 2AlCl3 + 3H2, how many chlorine atoms are present on the products side?
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3. Chemical Reactions
Balancing Chemical Equations
Multiple Choice
Which of the following statements is true about the balanced chemical equation: 2Ca(s) + O_2(g) → 2CaO(s)?
A
The equation requires a coefficient of 4 in front of CaO to be balanced.
B
The equation is unbalanced because there are more calcium atoms on the product side.
C
The equation is balanced with respect to both calcium and oxygen atoms.
D
There are more oxygen atoms on the reactant side than on the product side.
Verified step by step guidance1
Identify the number of atoms of each element on both sides of the equation. For the reactants, count the calcium (Ca) atoms and oxygen (O) atoms in \$2Ca(s) + O_2(g)$.
For the reactants: There are 2 calcium atoms (from \$2Ca\() and 2 oxygen atoms (from \)O_2$ molecule).
For the products: In \$2CaO(s)$, each formula unit contains 1 calcium atom and 1 oxygen atom, so 2 formula units contain 2 calcium atoms and 2 oxygen atoms.
Compare the number of atoms of each element on both sides. Since both sides have 2 calcium atoms and 2 oxygen atoms, the equation is balanced.
Conclude that the balanced chemical equation is correctly represented as \(2Ca(s) + O_2(g) \rightarrow 2CaO(s)\) without needing any additional coefficients.
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