If a 125 gms of radioactive element has a half life of 60 min how many half lives will it go through to become 3.90625 gms

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?