An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. only 2.5 g of this isotope is now left. what is its half-life?

__ _ _ _ _ is the process of removing earth materials from their original sites through weathering and transport and depositing the in another location. a. erosion b. sedimentation c. lithification d. dissolution

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

How can one make a supersaturated solution? (apex)