The ratio of the number of molecules of 4g of hydrogen to that of 32g of oxygen is ?

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Name the intersection of plane bpq and plane cpq.

What are several ways to reduce the effect of friction