The Mineral Cryolite, Na₃AlF₆, Is Used in the Hall Process

question 41

Multiple Choice

The mineral cryolite, Na₃AlF₆, is used in the Hall process for aluminum production as

• A) the source of aluminum (the ore).
• B) a chemical reducing agent.
• C) a material that forms a slag and thus removes impurities.
• D) a solvent for alumina, Al₂O₃.

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Definitions:

Mycelium

The mass of branched, thread-like filaments that make up the vegetative part of a fungus, allowing for nutrient absorption.

Hyphae

Long, branching filamentous structures of fungi, through which they absorb nutrients from their environment.

Zygomycota

A phylum of fungi characterized by their production of zygospores during sexual reproduction.

Puffballs

Type of fungi that belong to the division Basidiomycota, known for their round shape and the way they release spores through a pore or opening.