instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Opaque is the term for matter that does not let any light pass through.
answer:
What is the term for matter that does not let any light pass through?

question:
Compounds with metals and nonmetals sharing electrons are known as ions kinds of compounds.
answer:
Compounds with metals and nonmetals sharing electrons are known as what kinds of compounds?

question:
Research that focuses on understanding basic properties and processes without concern for the usefulness of this understanding is known as pure research kind of research.
answer:
Research that focuses on understanding basic properties and processes without concern for the usefulness of this understanding is known as what kind of research?