Question detail
Compare the reactivity of sodium and potassium with water. What observations would you make during these reactions?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
The periodic table
Question
Compare the reactivity of sodium and potassium with water. What observations would you make during these reactions?
Answer
Sodium reacts with water to form sodium hydroxide (NaOH) and hydrogen gas (H2), producing a smaller amount of fizzing compared to potassium. Potassium reacts more vigorously, producing potassium hydroxide (KOH) and hydrogen gas, and may ignite due to the heat generated, resulting in a lilac flame.
Explanation
This question requires students to apply their knowledge of the reactivity trends in Group 1 elements, comparing sodium and potassium. It tests their understanding of the differences in reaction vigor and the observations associated with each reaction.
Common mistake
Misunderstanding Reactivity
Students often think that all Group 1 elements react with water in the same way, without considering the differences in reactivity between lithium, sodium, and potassium.
Emphasize the trend in reactivity down Group 1, noting that potassium reacts more vigorously with water than sodium, which in turn reacts more vigorously than lithium.
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