二に酸さん化かケイ素そ

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Meanings

Chemical term for SiO₂; used in scientific and industrial contexts. Also referred to as シリカ.

シリカ
シリカ is the loanword for silica, often used interchangeably with 二酸化ケイ素 in industrial contexts, but 二酸化ケイ素 is the formal chemical name.

二に酸さん化かケイ素そ
Standard chemical term; ケイ素 is the modern katakana spelling for silicon.
二に酸さん化か珪けい素そ
Alternate kanji spelling using 珪 for silicon; less common in modern chemistry texts.

Compound of 二酸化 (dioxide) + ケイ素 (silicon). ケイ素 is a modern coinage using the katakana ケイ for the element silicon, replacing the older kanji 珪.