How do Infectious germs spread from person to person

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

Which of these conditions most likely produces an unstable isotope?

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory