After 42 days a 2.0-gram sample of phosphorus-32 contains only 0.25 grams of the isotope. What is the half-life of phosphorus-32?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Why is retrograde motion an apparent motion

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.