A certain unimolecular reaction is zero order. If the half-life of this reaction is 45 seconds, how long will it take for the reaction to be 70% complete

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

Sugar is dissolved in water. which is the solute? sugar neither both water

What substance has a mass of 9.5g and volume of 2.1cm^3