Chemical equations are only considered to be correct when th - GED Practice Questions
Question
Chemical equations are only considered to be correct when the elements’ symbols are correct and the equation is balanced. Balancing a chemical reaction entails making sure that the number of atoms of each element elements in the reactant side is equal to that of the product side.
For example, Silver sulphide (Ag2S) reacts with Aluminium (Al) to form aluminium suifide (Al2S3)
The equation is
Ag2S + Al→ Ag + Al2S3
Since the equation is not balanced, it is important to add coefficients in front of the chemical formulas.
A student partially balanced the equation as shown below;
3Ag2S + 2Al →?Ag+Al2S3
Which coefficient should be added in front to Ag to balance the equation?
Answers
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correct
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Explanation
Ensure that atoms of each element in the reactant side are equal to the product side;
On the reactant side, silver atoms are 6
On the product side, Ag atom is 1
Therefore, to balance the Ag atoms on the product side, add 6 in front of Ag so that the equation becomes;
3Ag2S + 2Al → 6Ag + Al2S3
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