What's the plural form of dimethyldichlorosilane? Here's the word you're looking for.
Answer
The noun dimethyldichlorosilane can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be dimethyldichlorosilane.
However, in more specific contexts, the plural form can also be dimethyldichlorosilanes e.g. in reference to various types of dimethyldichlorosilanes
or a collection of dimethyldichlorosilanes.