So, in my class, we are making a homemade gas mask. we have to find any type of gas that we could find easily to test the mask. any ideas?

Analyze how limestone is weathered and identify the features that are formed as a result of this dissolution

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

What is the percent by mass of oxygen in fe2o3