Â© Ted French. Definition: A function is a preset formula in Excel and Google Spreadsheets. Like formulas, functions begin with the equal sign (=) followed by the function's name and its arguments. The function name tells Excel what calculation to perform. The arguments are contained inside round brackets.
Best Answer: Look for molecular symmetries. Symmetrical molecules such as methane, carbon dioxide, carbon disulfide, and borane (BH3) are nonpolar. Asymmetric molecules such as water, ammonia, and acetone are polar.
Phosphate group is the polar head: hydrocarbon chain becomes nonpolar tails 3. Phospholipids arrange themselves in a double layer in wa ter, so the polar heads face outward toward water molecules and nonpolar tails face toward each other away from water molecules. 4.