Question detail
Explain why aluminium oxide is dissolved in molten cryolite during the extraction of aluminium.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Electrolysis
Question
Explain why aluminium oxide is dissolved in molten cryolite during the extraction of aluminium.
Answer
Aluminium oxide is dissolved in molten cryolite to lower the melting point of the mixture and improve the conductivity of the solution. This allows the electrolysis process to occur more efficiently, enabling the extraction of aluminium at a lower energy cost.
Explanation
This question assesses the student's ability to explain the practical reasons for using cryolite in the extraction process. It tests understanding of the concepts of melting point and conductivity in electrolysis.
Common mistake
Confusing Aluminium Oxide with Other Compounds
Students often confuse aluminium oxide with other aluminium compounds, such as aluminium chloride, when discussing its use in extraction.
To fix this, students should focus on the specific properties and formula of aluminium oxide (Al2O3) and understand its role in the extraction process.
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