How do you recognize substances that have gone through physical or chemical changes?

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

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?

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?