Ren runs a hamburger stand and needs to clean up a season’s worth of grease buildup on the range hood over his griddle. explain what he should look for in a cleaning product that can handle a layer of grease.

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

If element x has 99 protons how many electrons does it have

Is a volume of space that is empty of matter.