Why do u wash the residue with distilled water +20 points! Answer correctly. Wrong or irrelevant answers will be reported. Tysm in advance!

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it

If two identical atoms are bonded,what kind of molecule is formed

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.