the mass of cobalt-60 in a sample is found to have decreased from 1.6 grams to 0.40 grams how long did the sample decay if the half-life of cobalt-60 is 5.3 years

The variability in marine salinity between habitats does not impact the fish living there. select the best answer from the choices provided t f

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?