Combustion of methane; experimental setup and water detection?

My specific question is why I need to cool the U-tube (in which I have my water detection) thoroughly when burning methane. What are the effects of this, and would the water detection fail if the U-tube weren't cooled? The methane gas reacts to form water (and carbon dioxide) anyway, regardless of the temperature, right?

Methane?

Hey, I am currently working on the following task and wanted to ask if someone can help me with this task and explain it well. If you want to fill a cylinder with methane, you have to fill the cylinder with the opening Fill from the bottom? Explain your answer.

Non-polar methane?

Hello, I'm in 10th grade and will be giving a presentation about methane tomorrow. I learned that methane is non-polar and forms a covalent bond. A covalent bond forms when atoms share their outer electrons (please correct me if I'm wrong). My problem is the non-polar aspect. I read that it means that a molecule…