The half-life of a radioactive isotope is 20.0 minutes. what is the total amount of a 1.00-gram sample of this isotope remaining after 1.00 hour?

Compare and contrast solutions and suspensions

Which of the following statements about hybrid orbitals is or are true? choose all that apply. choose all that apply. under sp2 hybridization, the large lobes point to the vertices of an equilateral triangle. after an atom undergoes sp hybridization there is one unhybridized p orbital on the atom. the angle between the large lobes of sp3 hybrids is 109.5∘

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid