Question detail
Given the balanced equation 2H2 + O2 → 2H2O, explain how the equation illustrates the conservation of mass.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations
Question
Given the balanced equation 2H2 + O2 → 2H2O, explain how the equation illustrates the conservation of mass.
Answer
In the equation, there are 4 hydrogen atoms and 2 oxygen atoms on both sides. This shows that the total number of atoms before and after the reaction remains the same, illustrating the conservation of mass.
Explanation
This question assesses the ability to interpret a specific balanced equation in the context of mass conservation. A strong answer will clearly identify the number of atoms involved and relate this to the principle that mass is conserved in chemical reactions.
Common mistake
Misunderstanding Mass Conservation
Students often believe that mass can change during a chemical reaction, especially when gases are involved.
Emphasize that the law of conservation of mass states that no atoms are lost or made, so the total mass of reactants equals the total mass of products, regardless of the state of matter. Keep the correction anchored to Conservation of mass and balanced chemical equations; check formula, substitution, calculation, final answer, and unit where relevant.
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