The half-life of a radioactive isotope is 20.0 minutes. what is the total amount of a 1.00-gram sample of this sample of this isotope remaining after 1.00 hour?

What effect might melting sea ice have for people who live in coastal areas?

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Which element would mostly likely have an electron affinity measuring closest to zero