10.2 Chem 1212 Exercises

The test tubes shown here contain equal amounts of the specified motor oils. Identical metal spheres were dropped at the same time into each of the tubes, and a brief moment later, the spheres had fallen to the heights indicated in the illustration. Rank the motor oils in order of increasing viscosity, and explain your reasoning: https://chem.libretexts.org/@api/deki/files/63362/CNX_Chem_10_02_Testtubeoi_img.jpg?revision=1

20 < 30 < 40 < 50; the ball takes longer to flow through the liquid therefore signifying a higher viscosity

Although steel is denser than water, a steel needle or paper clip placed carefully lengthwise on the surface of still water can be made to float. Explain at a molecular level how this is possible.

the water molecules are (hydrogen) bonded together so strongly that it has surface tension forming a surface "skin" that can support the needle.