Carbon 14 has a half life of 5715 years if an original 100g of 14c in how many years will 25g remain

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?