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, making the extraction process more energy-efficient. Cryolite also enhances the conductivity of the solution, allowing for better electrolysis.
Explanation
This question tests the understanding of the role of cryolite in the extraction of aluminium, focusing on the practical aspects of electrolysis and energy efficiency. It requires students to connect concepts of melting points and conductivity in the context of metal extraction.
Common mistake
Aluminium oxide dissolves in molten cryolite because it reacts chemically
Students often think aluminium oxide dissolves in molten cryolite due to a chemical reaction between Al₂O₃ and Na₃AlF₆, forming new compounds.
Aluminium oxide dissolves in molten cryolite simply because cryolite is a molten salt that provides a low‑melting, electrically conductive medium; the Al₂O₃ remains chemically unchanged and is only dispersed in the melt, not reacted with the cryolite.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.