Is there any matter that is not combined to form a compound

The noble gases (e.g., neon) and noble metals (e.g., mercury) can also be found in their pure, non-bonded forms in nature. Still, most of these elements are found in mixtures. When two distinct elements are chemically combined—i.e., chemical bonds form between their atoms—the result is called a chemical compound.

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.