In the chemical formula CH4, how many atoms of hydrogen (H) are there?
A) 1
B) 2
C) 3
D) 4

What best discribes the relationship between wavelength and frequency in a electromagnetic wave

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

•hydration •dissociation •dissolving which one goes to which